libmysql.c 136 KB
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/* Copyright (C) 2000-2004 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation.

   There are special exceptions to the terms and conditions of the GPL as it
   is applied to this software. View the full text of the exception in file
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   EXCEPTIONS-CLIENT in the directory of this software distribution.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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#include <my_global.h>
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#include <my_sys.h>
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#include <my_time.h>
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#include <mysys_err.h>
#include <m_string.h>
#include <m_ctype.h>
#include "mysql.h"
#include "mysql_version.h"
#include "mysqld_error.h"
#include "errmsg.h"
#include <violite.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#ifdef	 HAVE_PWD_H
#include <pwd.h>
#endif
#if !defined(MSDOS) && !defined(__WIN__)
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_SELECT_H
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#include <select.h>
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#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
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#endif /* !defined(MSDOS) && !defined(__WIN__) */
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#ifdef HAVE_POLL
#include <sys/poll.h>
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#endif
#ifdef HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
#if defined(THREAD) && !defined(__WIN__)
#include <my_pthread.h>				/* because of signal()	*/
#endif
#ifndef INADDR_NONE
#define INADDR_NONE	-1
#endif

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#include <sql_common.h>
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#include "client_settings.h"
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#undef net_buffer_length
#undef max_allowed_packet
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ulong 		net_buffer_length=8192;
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ulong		max_allowed_packet= 1024L*1024L*1024L;
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ulong		net_read_timeout=  CLIENT_NET_READ_TIMEOUT;
ulong		net_write_timeout= CLIENT_NET_WRITE_TIMEOUT;
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#ifdef EMBEDDED_LIBRARY
#undef net_flush
my_bool	net_flush(NET *net);
#endif

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#if defined(MSDOS) || defined(__WIN__)
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/* socket_errno is defined in my_global.h for all platforms */
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#define perror(A)
#else
#include <errno.h>
#define SOCKET_ERROR -1
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#endif /* __WIN__ */
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/*
  If allowed through some configuration, then this needs to
  be changed
*/
#define MAX_LONG_DATA_LENGTH 8192
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#define unsigned_field(A) ((A)->flags & UNSIGNED_FLAG)

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static void append_wild(char *to,char *end,const char *wild);
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sig_handler pipe_sig_handler(int sig);
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static my_bool mysql_client_init= 0;
static my_bool org_my_init_done= 0;

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/*
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  Initialize the MySQL client library
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  SYNOPSIS
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    mysql_server_init()
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  NOTES
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    Should be called before doing any other calls to the MySQL
    client library to initialize thread specific variables etc.
    It's called by mysql_init() to ensure that things will work for
    old not threaded applications that doesn't call mysql_server_init()
    directly.
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  RETURN
    0  ok
    1  could not initialize environment (out of memory or thread keys)
*/

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int STDCALL mysql_server_init(int argc __attribute__((unused)),
			      char **argv __attribute__((unused)),
			      char **groups __attribute__((unused)))
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{
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  int result= 0;
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  if (!mysql_client_init)
  {
    mysql_client_init=1;
    org_my_init_done=my_init_done;
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    if (my_init())				/* Will init threads */
      return 1;
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    init_client_errs();
    if (!mysql_port)
    {
      mysql_port = MYSQL_PORT;
#ifndef MSDOS
      {
	struct servent *serv_ptr;
	char	*env;
	if ((serv_ptr = getservbyname("mysql", "tcp")))
	  mysql_port = (uint) ntohs((ushort) serv_ptr->s_port);
	if ((env = getenv("MYSQL_TCP_PORT")))
	  mysql_port =(uint) atoi(env);
      }
#endif
    }
    if (!mysql_unix_port)
    {
      char *env;
#ifdef __WIN__
      mysql_unix_port = (char*) MYSQL_NAMEDPIPE;
#else
      mysql_unix_port = (char*) MYSQL_UNIX_ADDR;
#endif
      if ((env = getenv("MYSQL_UNIX_PORT")))
	mysql_unix_port = env;
    }
    mysql_debug(NullS);
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#if defined(SIGPIPE) && !defined(__WIN__) && !defined(__NETWARE__)
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    (void) signal(SIGPIPE, SIG_IGN);
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#endif
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#ifdef EMBEDDED_LIBRARY
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    result= init_embedded_server(argc, argv, groups);
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#endif
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  }
#ifdef THREAD
  else
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    result= (int)my_thread_init();         /* Init if new thread */
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#endif
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  return result;
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}
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void STDCALL mysql_server_end()
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{
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#ifdef EMBEDDED_LIBRARY
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  end_embedded_server();
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#endif
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  /* If library called my_init(), free memory allocated by it */
  if (!org_my_init_done)
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  {
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    my_end(0);
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#ifndef THREAD
  /* Remove TRACING, if enabled by mysql_debug() */
    DBUG_POP();
#endif
  }
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  else
    mysql_thread_end();
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  mysql_client_init= org_my_init_done= 0;
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}
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static MYSQL_PARAMETERS mysql_internal_parameters=
{&max_allowed_packet, &net_buffer_length};

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MYSQL_PARAMETERS *STDCALL mysql_get_parameters(void)
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{
  return &mysql_internal_parameters;
}

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my_bool STDCALL mysql_thread_init()
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{
#ifdef THREAD
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  return my_thread_init();
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#else
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  return 0;
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#endif
}

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void STDCALL mysql_thread_end()
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{
#ifdef THREAD
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  my_thread_end();
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#endif
}

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/*
  Let the user specify that we don't want SIGPIPE;  This doesn't however work
  with threaded applications as we can have multiple read in progress.
*/
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static MYSQL* spawn_init(MYSQL* parent, const char* host,
			 unsigned int port,
			 const char* user,
			 const char* passwd);

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/*
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  Expand wildcard to a sql string
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*/

static void
append_wild(char *to, char *end, const char *wild)
{
  end-=5;					/* Some extra */
  if (wild && wild[0])
  {
    to=strmov(to," like '");
    while (*wild && to < end)
    {
      if (*wild == '\\' || *wild == '\'')
	*to++='\\';
      *to++= *wild++;
    }
    if (*wild)					/* Too small buffer */
      *to++='%';				/* Nicer this way */
    to[0]='\'';
    to[1]=0;
  }
}


/**************************************************************************
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  Init debugging if MYSQL_DEBUG environment variable is found
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**************************************************************************/

void STDCALL
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mysql_debug(const char *debug __attribute__((unused)))
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{
#ifndef DBUG_OFF
  char	*env;
  if (_db_on_)
    return;					/* Already using debugging */
  if (debug)
  {
    DEBUGGER_ON;
    DBUG_PUSH(debug);
  }
  else if ((env = getenv("MYSQL_DEBUG")))
  {
    DEBUGGER_ON;
    DBUG_PUSH(env);
#if !defined(_WINVER) && !defined(WINVER)
    puts("\n-------------------------------------------------------");
    puts("MYSQL_DEBUG found. libmysql started with the following:");
    puts(env);
    puts("-------------------------------------------------------\n");
#else
    {
      char buff[80];
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      buff[sizeof(buff)-1]= 0;
      strxnmov(buff,sizeof(buff)-1,"libmysql: ", env, NullS);
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      MessageBox((HWND) 0,"Debugging variable MYSQL_DEBUG used",buff,MB_OK);
    }
#endif
  }
#endif
}


/**************************************************************************
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  Close the server connection if we get a SIGPIPE
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   ARGSUSED
**************************************************************************/

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sig_handler
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pipe_sig_handler(int sig __attribute__((unused)))
{
  DBUG_PRINT("info",("Hit by signal %d",sig));
#ifdef DONT_REMEMBER_SIGNAL
  (void) signal(SIGPIPE,pipe_sig_handler);
#endif
}

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/* perform query on master */
my_bool STDCALL mysql_master_query(MYSQL *mysql, const char *q,
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				   unsigned long length)
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{
  DBUG_ENTER("mysql_master_query");
  if (mysql_master_send_query(mysql, q, length))
    DBUG_RETURN(1);
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  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
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}
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my_bool STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
					unsigned long length)
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{
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  MYSQL *master = mysql->master;
  DBUG_ENTER("mysql_master_send_query");
  if (!master->net.vio && !mysql_real_connect(master,0,0,0,0,0,0,0))
    DBUG_RETURN(1);
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  master->reconnect= 1;
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  mysql->last_used_con = master;
  DBUG_RETURN(simple_command(master, COM_QUERY, q, length, 1));
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}


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/* perform query on slave */
my_bool STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
				  unsigned long length)
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{
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  DBUG_ENTER("mysql_slave_query");
  if (mysql_slave_send_query(mysql, q, length))
    DBUG_RETURN(1);
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  DBUG_RETURN((*mysql->methods->read_query_result)(mysql));
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}


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my_bool STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
				   unsigned long length)
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{
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  MYSQL* last_used_slave, *slave_to_use = 0;
  DBUG_ENTER("mysql_slave_send_query");
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  if ((last_used_slave = mysql->last_used_slave))
    slave_to_use = last_used_slave->next_slave;
  else
    slave_to_use = mysql->next_slave;
  /*
    Next_slave is always safe to use - we have a circular list of slaves
    if there are no slaves, mysql->next_slave == mysql
  */
  mysql->last_used_con = mysql->last_used_slave = slave_to_use;
  if (!slave_to_use->net.vio && !mysql_real_connect(slave_to_use, 0,0,0,
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						    0,0,0,0))
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    DBUG_RETURN(1);
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  slave_to_use->reconnect= 1;
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  DBUG_RETURN(simple_command(slave_to_use, COM_QUERY, q, length, 1));
}
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/* enable/disable parsing of all queries to decide
   if they go on master or slave */
void STDCALL mysql_enable_rpl_parse(MYSQL* mysql)
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{
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  mysql->options.rpl_parse = 1;
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}

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void STDCALL mysql_disable_rpl_parse(MYSQL* mysql)
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{
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  mysql->options.rpl_parse = 0;
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}

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/* get the value of the parse flag */
int STDCALL mysql_rpl_parse_enabled(MYSQL* mysql)
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{
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  return mysql->options.rpl_parse;
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}

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/*  enable/disable reads from master */
void STDCALL mysql_enable_reads_from_master(MYSQL* mysql)
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{
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  mysql->options.no_master_reads = 0;
}
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void STDCALL mysql_disable_reads_from_master(MYSQL* mysql)
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{
  mysql->options.no_master_reads = 1;
}

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/* get the value of the master read flag */
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my_bool STDCALL mysql_reads_from_master_enabled(MYSQL* mysql)
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{
  return !(mysql->options.no_master_reads);
}

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/*
  We may get an error while doing replication internals.
  In this case, we add a special explanation to the original
  error
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*/
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static void expand_error(MYSQL* mysql, int error)
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{
  char tmp[MYSQL_ERRMSG_SIZE];
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  char *p;
  uint err_length;
  strmake(tmp, mysql->net.last_error, MYSQL_ERRMSG_SIZE-1);
  p = strmake(mysql->net.last_error, ER(error), MYSQL_ERRMSG_SIZE-1);
  err_length= (uint) (p - mysql->net.last_error);
  strmake(p, tmp, MYSQL_ERRMSG_SIZE-1 - err_length);
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  mysql->net.last_errno = error;
}

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/*
  This function assumes we have just called SHOW SLAVE STATUS and have
  read the given result and row
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*/
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static my_bool get_master(MYSQL* mysql, MYSQL_RES* res, MYSQL_ROW row)
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{
  MYSQL* master;
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  DBUG_ENTER("get_master");
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  if (mysql_num_fields(res) < 3)
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    DBUG_RETURN(1); /* safety */
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  /* use the same username and password as the original connection */
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  if (!(master = spawn_init(mysql, row[0], atoi(row[2]), 0, 0)))
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    DBUG_RETURN(1);
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  mysql->master = master;
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  DBUG_RETURN(0);
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}

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/*
  Assuming we already know that mysql points to a master connection,
  retrieve all the slaves
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*/
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static my_bool get_slaves_from_master(MYSQL* mysql)
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{
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  MYSQL_RES* res = 0;
  MYSQL_ROW row;
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  my_bool error = 1;
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  int has_auth_info;
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  int port_ind;
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  DBUG_ENTER("get_slaves_from_master");
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  if (!mysql->net.vio && !mysql_real_connect(mysql,0,0,0,0,0,0,0))
  {
    expand_error(mysql, CR_PROBE_MASTER_CONNECT);
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    DBUG_RETURN(1);
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  }
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  mysql->reconnect= 1;
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  if (mysql_query(mysql, "SHOW SLAVE HOSTS") ||
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      !(res = mysql_store_result(mysql)))
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  {
    expand_error(mysql, CR_PROBE_SLAVE_HOSTS);
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    DBUG_RETURN(1);
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  }

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  switch (mysql_num_fields(res)) {
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  case 5:
    has_auth_info = 0;
    port_ind=2;
    break;
  case 7:
    has_auth_info = 1;
    port_ind=4;
    break;
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  default:
    goto err;
  }

  while ((row = mysql_fetch_row(res)))
  {
    MYSQL* slave;
    const char* tmp_user, *tmp_pass;

    if (has_auth_info)
    {
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      tmp_user = row[2];
      tmp_pass = row[3];
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    }
    else
    {
      tmp_user = mysql->user;
      tmp_pass = mysql->passwd;
    }

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    if (!(slave = spawn_init(mysql, row[1], atoi(row[port_ind]),
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			     tmp_user, tmp_pass)))
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      goto err;
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    /* Now add slave into the circular linked list */
    slave->next_slave = mysql->next_slave;
    mysql->next_slave = slave;
  }
  error = 0;
err:
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  if (res)
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    mysql_free_result(res);
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  DBUG_RETURN(error);
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}

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my_bool STDCALL mysql_rpl_probe(MYSQL* mysql)
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{
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  MYSQL_RES *res= 0;
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  MYSQL_ROW row;
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  my_bool error= 1;
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  DBUG_ENTER("mysql_rpl_probe");

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  /*
    First determine the replication role of the server we connected to
    the most reliable way to do this is to run SHOW SLAVE STATUS and see
    if we have a non-empty master host. This is still not fool-proof -
    it is not a sin to have a master that has a dormant slave thread with
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    a non-empty master host. However, it is more reliable to check
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    for empty master than whether the slave thread is actually running
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  */
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  if (mysql_query(mysql, "SHOW SLAVE STATUS") ||
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      !(res = mysql_store_result(mysql)))
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  {
    expand_error(mysql, CR_PROBE_SLAVE_STATUS);
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    DBUG_RETURN(1);
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  }
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  row= mysql_fetch_row(res);
  /*
    Check master host for emptiness/NULL
    For MySQL 4.0 it's enough to check for row[0]
  */
  if (row && row[0] && *(row[0]))
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  {
    /* this is a slave, ask it for the master */
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    if (get_master(mysql, res, row) || get_slaves_from_master(mysql))
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      goto err;
  }
  else
  {
    mysql->master = mysql;
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    if (get_slaves_from_master(mysql))
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      goto err;
  }

  error = 0;
err:
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  if (res)
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    mysql_free_result(res);
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  DBUG_RETURN(error);
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}


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/*
  Make a not so fool-proof decision on where the query should go, to
  the master or the slave. Ideally the user should always make this
  decision himself with mysql_master_query() or mysql_slave_query().
  However, to be able to more easily port the old code, we support the
  option of an educated guess - this should work for most applications,
  however, it may make the wrong decision in some particular cases. If
  that happens, the user would have to change the code to call
  mysql_master_query() or mysql_slave_query() explicitly in the place
  where we have made the wrong decision
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*/
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enum mysql_rpl_type
STDCALL mysql_rpl_query_type(const char* q, int len)
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{
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  const char *q_end= q + len;
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  for (; q < q_end; ++q)
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  {
    char c;
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    if (my_isalpha(&my_charset_latin1, (c= *q)))
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    {
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      switch (my_tolower(&my_charset_latin1,c)) {
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      case 'i':  /* insert */
      case 'u':  /* update or unlock tables */
      case 'l':  /* lock tables or load data infile */
      case 'd':  /* drop or delete */
      case 'a':  /* alter */
	return MYSQL_RPL_MASTER;
      case 'c':  /* create or check */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_MASTER;
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      case 's': /* select or show */
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	return my_tolower(&my_charset_latin1,q[1]) == 'h' ? MYSQL_RPL_ADMIN :
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	  MYSQL_RPL_SLAVE;
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      case 'f': /* flush */
      case 'r': /* repair */
      case 'g': /* grant */
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	return MYSQL_RPL_ADMIN;
      default:
	return MYSQL_RPL_SLAVE;
      }
    }
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  }
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  return MYSQL_RPL_MASTER;		/* By default, send to master */
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}


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/**************************************************************************
  Connect to sql server
  If host == 0 then use localhost
**************************************************************************/
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#ifdef USE_OLD_FUNCTIONS
MYSQL * STDCALL
mysql_connect(MYSQL *mysql,const char *host,
	      const char *user, const char *passwd)
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{
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  MYSQL *res;
  mysql=mysql_init(mysql);			/* Make it thread safe */
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  {
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    DBUG_ENTER("mysql_connect");
    if (!(res=mysql_real_connect(mysql,host,user,passwd,NullS,0,NullS,0)))
    {
      if (mysql->free_me)
	my_free((gptr) mysql,MYF(0));
    }
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    mysql->reconnect= 1;
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    DBUG_RETURN(res);
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  }
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}
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#endif
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/**************************************************************************
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  Change user and database
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**************************************************************************/
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int cli_read_change_user_result(MYSQL *mysql, char *buff, const char *passwd)
{
  NET *net= &mysql->net;
  ulong pkt_length;

  pkt_length= net_safe_read(mysql);
  
  if (pkt_length == packet_error)
    return 1;

  if (pkt_length == 1 && net->read_pos[0] == 254 &&
      mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
  {
    /*
      By sending this very specific reply server asks us to send scrambled
      password in old format. The reply contains scramble_323.
    */
    scramble_323(buff, mysql->scramble, passwd);
    if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
    {
      net->last_errno= CR_SERVER_LOST;
      strmov(net->sqlstate, unknown_sqlstate);
      strmov(net->last_error,ER(net->last_errno));
      return 1;
    }
    /* Read what server thinks about out new auth message report */
    if (net_safe_read(mysql) == packet_error)
      return 1;
  }
  return 0;
}
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my_bool	STDCALL mysql_change_user(MYSQL *mysql, const char *user,
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				  const char *passwd, const char *db)
{
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  char buff[512],*end=buff;
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  int rc;
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  DBUG_ENTER("mysql_change_user");

  if (!user)
    user="";
  if (!passwd)
    passwd="";
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  /* Store user into the buffer */
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  end=strmov(end,user)+1;
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  /* write scrambled password according to server capabilities */
  if (passwd[0])
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  {
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    if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
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    {
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      *end++= SCRAMBLE_LENGTH;
      scramble(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH;
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    }
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    else
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    {
      scramble_323(end, mysql->scramble, passwd);
      end+= SCRAMBLE_LENGTH_323 + 1;
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    }
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  }
  else
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    *end++= '\0';                               /* empty password */
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  /* Add database if needed */
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  end= strmov(end, db ? db : "") + 1;
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  /* Write authentication package */
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  simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);
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  rc= (*mysql->methods->read_change_user_result)(mysql, buff, passwd);

  /*
    The server will close all statements no matter was the attempt
    to change user successful or not.
  */
  mysql_detach_stmt_list(&mysql->stmts);
  if (rc == 0)
  {
    /* Free old connect information */
    my_free(mysql->user,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->passwd,MYF(MY_ALLOW_ZERO_PTR));
    my_free(mysql->db,MYF(MY_ALLOW_ZERO_PTR));

    /* alloc new connect information */
    mysql->user=  my_strdup(user,MYF(MY_WME));
    mysql->passwd=my_strdup(passwd,MYF(MY_WME));
    mysql->db=    db ? my_strdup(db,MYF(MY_WME)) : 0;
  }
  DBUG_RETURN(rc);
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}

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#if defined(HAVE_GETPWUID) && defined(NO_GETPWUID_DECL)
struct passwd *getpwuid(uid_t);
char* getlogin(void);
#endif

#if defined(__NETWARE__)
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/* Default to value of USER on NetWare, if unset use "UNKNOWN_USER" */
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void read_user_name(char *name)
{
  char *str=getenv("USER");
  strmake(name, str ? str : "UNKNOWN_USER", USERNAME_LENGTH);
}

#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__) && !defined(OS2)

void read_user_name(char *name)
{
  DBUG_ENTER("read_user_name");
  if (geteuid() == 0)
    (void) strmov(name,"root");		/* allow use of surun */
  else
  {
#ifdef HAVE_GETPWUID
    struct passwd *skr;
    const char *str;
    if ((str=getlogin()) == NULL)
    {
      if ((skr=getpwuid(geteuid())) != NULL)
	str=skr->pw_name;
      else if (!(str=getenv("USER")) && !(str=getenv("LOGNAME")) &&
	       !(str=getenv("LOGIN")))
	str="UNKNOWN_USER";
    }
    (void) strmake(name,str,USERNAME_LENGTH);
#elif HAVE_CUSERID
    (void) cuserid(name);
#else
    strmov(name,"UNKNOWN_USER");
#endif
  }
  DBUG_VOID_RETURN;
}

#else /* If MSDOS || VMS */

void read_user_name(char *name)
{
  char *str=getenv("USER");		/* ODBC will send user variable */
  strmake(name,str ? str : "ODBC", USERNAME_LENGTH);
}

#endif

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my_bool handle_local_infile(MYSQL *mysql, const char *net_filename)
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{
  my_bool result= 1;
  uint packet_length=MY_ALIGN(mysql->net.max_packet-16,IO_SIZE);
  NET *net= &mysql->net;
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  int readcount;
  void *li_ptr;          /* pass state to local_infile functions */
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  char *buf;		/* buffer to be filled by local_infile_read */
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  struct st_mysql_options *options= &mysql->options;
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  DBUG_ENTER("handle_local_infile");

  /* check that we've got valid callback functions */
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  if (!(options->local_infile_init &&
	options->local_infile_read &&
	options->local_infile_end &&
	options->local_infile_error))
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  {
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    /* if any of the functions is invalid, set the default */
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    mysql_set_local_infile_default(mysql);
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  }

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  /* copy filename into local memory and allocate read buffer */
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  if (!(buf=my_malloc(packet_length, MYF(0))))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    strmov(net->last_error, ER(net->last_errno=CR_OUT_OF_MEMORY));
    DBUG_RETURN(1);
  }
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  /* initialize local infile (open file, usually) */
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  if ((*options->local_infile_init)(&li_ptr, net_filename,
    options->local_infile_userdata))
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  {
    my_net_write(net,"",0);		/* Server needs one packet */
    net_flush(net);
    strmov(net->sqlstate, unknown_sqlstate);
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    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
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    goto err;
  }

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  /* read blocks of data from local infile callback */
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  while ((readcount =
	  (*options->local_infile_read)(li_ptr, buf,
					packet_length)) > 0)
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  {
    if (my_net_write(net,buf,readcount))
    {
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      DBUG_PRINT("error",
		 ("Lost connection to MySQL server during LOAD DATA of local file"));
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      strmov(net->sqlstate, unknown_sqlstate);
      net->last_errno=CR_SERVER_LOST;
      strmov(net->last_error,ER(net->last_errno));
      goto err;
    }
  }
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  /* Send empty packet to mark end of file */
  if (my_net_write(net,"",0) || net_flush(net))
  {
    strmov(net->sqlstate, unknown_sqlstate);
    net->last_errno=CR_SERVER_LOST;
    sprintf(net->last_error,ER(net->last_errno),errno);
    goto err;
  }
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  if (readcount < 0)
  {
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    net->last_errno= (*options->local_infile_error)(li_ptr,
						    net->last_error,
						    sizeof(net->last_error)-1);
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    goto err;
  }
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  result=0;					/* Ok */

err:
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  /* free up memory allocated with _init, usually */
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  (*options->local_infile_end)(li_ptr);
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  DBUG_RETURN(result);
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}


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/****************************************************************************
  Default handlers for LOAD LOCAL INFILE
****************************************************************************/

typedef struct st_default_local_infile
{
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  int fd;
  int error_num;
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  const char *filename;
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  char error_msg[LOCAL_INFILE_ERROR_LEN];
} default_local_infile_data;


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/*
  Open file for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_init()
    ptr			Store pointer to internal data here
    filename		File name to open. This may be in unix format !


  NOTES
    Even if this function returns an error, the load data interface
    guarantees that default_local_infile_end() is called.

  RETURN
    0	ok
    1	error
*/

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static int default_local_infile_init(void **ptr, const char *filename,
             void *userdata __attribute__ ((unused)))
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{
  default_local_infile_data *data;
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  char tmp_name[FN_REFLEN];
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  if (!(*ptr= data= ((default_local_infile_data *)
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		     my_malloc(sizeof(default_local_infile_data),  MYF(0)))))
    return 1; /* out of memory */
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  data->error_msg[0]= 0;
  data->error_num=    0;
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  data->filename= filename;
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  fn_format(tmp_name, filename, "", "", MY_UNPACK_FILENAME);
  if ((data->fd = my_open(tmp_name, O_RDONLY, MYF(0))) < 0)
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  {
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    data->error_num= my_errno;
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    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
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                EE(EE_FILENOTFOUND), tmp_name, data->error_num);
    return 1;
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  }
  return 0; /* ok */
}


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/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_read()
    ptr			Points to handle allocated by _init
    buf			Read data here
    buf_len		Ammount of data to read

  RETURN
    > 0		number of bytes read
    == 0	End of data
    < 0		Error
*/

static int default_local_infile_read(void *ptr, char *buf, uint buf_len)
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{
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  int count;
  default_local_infile_data*data = (default_local_infile_data *) ptr;
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  if ((count= (int) my_read(data->fd, (byte *) buf, buf_len, MYF(0))) < 0)
  {
    data->error_num= EE_READ; /* the errmsg for not entire file read */
    my_snprintf(data->error_msg, sizeof(data->error_msg)-1,
		EE(EE_READ),
		data->filename, my_errno);
  }
  return count;
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}


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/*
  Read data for LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!

  RETURN
*/

static void default_local_infile_end(void *ptr)
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{
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  default_local_infile_data *data= (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
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  {
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    if (data->fd >= 0)
      my_close(data->fd, MYF(MY_WME));
    my_free(ptr, MYF(MY_WME));
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  }
}


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/*
  Return error from LOAD LOCAL INFILE

  SYNOPSIS
    default_local_infile_end()
    ptr			Points to handle allocated by _init
			May be NULL if _init failed!
    error_msg		Store error text here
    error_msg_len	Max lenght of error_msg

  RETURN
    error message number
*/

static int
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default_local_infile_error(void *ptr, char *error_msg, uint error_msg_len)
{
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  default_local_infile_data *data = (default_local_infile_data *) ptr;
  if (data)					/* If not error on open */
  {
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    strmake(error_msg, data->error_msg, error_msg_len);
    return data->error_num;
  }
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  /* This can only happen if we got error on malloc of handle */
  strmov(error_msg, ER(CR_OUT_OF_MEMORY));
  return CR_OUT_OF_MEMORY;
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}


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void
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mysql_set_local_infile_handler(MYSQL *mysql,
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                               int (*local_infile_init)(void **, const char *,
                               void *),
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                               int (*local_infile_read)(void *, char *, uint),
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                               void (*local_infile_end)(void *),
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                               int (*local_infile_error)(void *, char *, uint),
                               void *userdata)
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{
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  mysql->options.local_infile_init=  local_infile_init;
  mysql->options.local_infile_read=  local_infile_read;
  mysql->options.local_infile_end=   local_infile_end;
  mysql->options.local_infile_error= local_infile_error;
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  mysql->options.local_infile_userdata = userdata;
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}


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void mysql_set_local_infile_default(MYSQL *mysql)
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{
  mysql->options.local_infile_init=  default_local_infile_init;
  mysql->options.local_infile_read=  default_local_infile_read;
  mysql->options.local_infile_end=   default_local_infile_end;
  mysql->options.local_infile_error= default_local_infile_error;
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}


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/**************************************************************************
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  Do a query. If query returned rows, free old rows.
  Read data by mysql_store_result or by repeat call of mysql_fetch_row
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**************************************************************************/

int STDCALL
mysql_query(MYSQL *mysql, const char *query)
{
  return mysql_real_query(mysql,query, (uint) strlen(query));
}

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static MYSQL* spawn_init(MYSQL* parent, const char* host,
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			 unsigned int port, const char* user,
			 const char* passwd)
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{
  MYSQL* child;
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  DBUG_ENTER("spawn_init");
  if (!(child= mysql_init(0)))
    DBUG_RETURN(0);

  child->options.user= my_strdup((user) ? user :
				 (parent->user ? parent->user :
				  parent->options.user), MYF(0));
  child->options.password= my_strdup((passwd) ? passwd :
				     (parent->passwd ?
				      parent->passwd :
				      parent->options.password), MYF(0));
  child->options.port= port;
  child->options.host= my_strdup((host) ? host :
				 (parent->host ?
				  parent->host :
				  parent->options.host), MYF(0));
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  if (parent->db)
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    child->options.db= my_strdup(parent->db, MYF(0));
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  else if (parent->options.db)
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    child->options.db= my_strdup(parent->options.db, MYF(0));
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  /*
    rpl_pivot is set to 1 in mysql_init();  Reset it as we are not doing
    replication here
  */
  child->rpl_pivot= 0;
  DBUG_RETURN(child);
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}


int
STDCALL mysql_set_master(MYSQL* mysql, const char* host,
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			 unsigned int port, const char* user,
			 const char* passwd)
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{
  if (mysql->master != mysql && !mysql->master->rpl_pivot)
    mysql_close(mysql->master);
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  if (!(mysql->master = spawn_init(mysql, host, port, user, passwd)))
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    return 1;
  return 0;
}

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int
STDCALL mysql_add_slave(MYSQL* mysql, const char* host,
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			unsigned int port,
			const char* user,
			const char* passwd)
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{
  MYSQL* slave;
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  if (!(slave = spawn_init(mysql, host, port, user, passwd)))
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    return 1;
  slave->next_slave = mysql->next_slave;
  mysql->next_slave = slave;
  return 0;
}

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/**************************************************************************
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  Return next field of the query results
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**************************************************************************/

MYSQL_FIELD * STDCALL
mysql_fetch_field(MYSQL_RES *result)
{
  if (result->current_field >= result->field_count)
    return(NULL);
  return &result->fields[result->current_field++];
}

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/**************************************************************************
  Get column lengths of the current row
  If one uses mysql_use_result, res->lengths contains the length information,
  else the lengths are calculated from the offset between pointers.
**************************************************************************/

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ulong * STDCALL
mysql_fetch_lengths(MYSQL_RES *res)
{
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  MYSQL_ROW column;
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  if (!(column=res->current_row))
    return 0;					/* Something is wrong */
  if (res->data)
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    (*res->methods->fetch_lengths)(res->lengths, column, res->field_count);
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  return res->lengths;
}

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/**************************************************************************
  Move to a specific row and column
**************************************************************************/

void STDCALL
mysql_data_seek(MYSQL_RES *result, my_ulonglong row)
{
  MYSQL_ROWS	*tmp=0;
  DBUG_PRINT("info",("mysql_data_seek(%ld)",(long) row));
  if (result->data)
    for (tmp=result->data->data; row-- && tmp ; tmp = tmp->next) ;
  result->current_row=0;
  result->data_cursor = tmp;
}


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/*************************************************************************
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  put the row or field cursor one a position one got from mysql_row_tell()
  This doesn't restore any data. The next mysql_fetch_row or
  mysql_fetch_field will return the next row or field after the last used
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*************************************************************************/

MYSQL_ROW_OFFSET STDCALL
mysql_row_seek(MYSQL_RES *result, MYSQL_ROW_OFFSET row)
{
  MYSQL_ROW_OFFSET return_value=result->data_cursor;
  result->current_row= 0;
  result->data_cursor= row;
  return return_value;
}


MYSQL_FIELD_OFFSET STDCALL
mysql_field_seek(MYSQL_RES *result, MYSQL_FIELD_OFFSET field_offset)
{
  MYSQL_FIELD_OFFSET return_value=result->current_field;
  result->current_field=field_offset;
  return return_value;
}

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/*****************************************************************************
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  List all databases
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*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_dbs(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_dbs");

  append_wild(strmov(buff,"show databases"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}


/*****************************************************************************
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  List all tables in a database
  If wild is given then only the tables matching wild is returned
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*****************************************************************************/

MYSQL_RES * STDCALL
mysql_list_tables(MYSQL *mysql, const char *wild)
{
  char buff[255];
  DBUG_ENTER("mysql_list_tables");

  append_wild(strmov(buff,"show tables"),buff+sizeof(buff),wild);
  if (mysql_query(mysql,buff))
    DBUG_RETURN(0);
  DBUG_RETURN (mysql_store_result(mysql));
}

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MYSQL_FIELD *cli_list_fields(MYSQL *mysql)
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{
  MYSQL_DATA *query;
  if (!(query= cli_read_rows(mysql,(MYSQL_FIELD*) 0, 
			     protocol_41(mysql) ? 8 : 6)))
    return NULL;

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  mysql->field_count= (uint) query->rows;
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  return unpack_fields(query,&mysql->field_alloc,
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		       mysql->field_count, 1, mysql->server_capabilities);
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}


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/**************************************************************************
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  List all fields in a table
  If wild is given then only the fields matching wild is returned
  Instead of this use query:
  show fields in 'table' like "wild"
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**************************************************************************/

MYSQL_RES * STDCALL
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mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)
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{
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  MYSQL_RES   *result;
  MYSQL_FIELD *fields;
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  char	     buff[257],*end;
  DBUG_ENTER("mysql_list_fields");
  DBUG_PRINT("enter",("table: '%s'  wild: '%s'",table,wild ? wild : ""));

  end=strmake(strmake(buff, table,128)+1,wild ? wild : "",128);
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  free_old_query(mysql);
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  if (simple_command(mysql,COM_FIELD_LIST,buff,(ulong) (end-buff),1) ||
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      !(fields= (*mysql->methods->list_fields)(mysql)))
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    DBUG_RETURN(NULL);

  if (!(result = (MYSQL_RES *) my_malloc(sizeof(MYSQL_RES),
					 MYF(MY_WME | MY_ZEROFILL))))
    DBUG_RETURN(NULL);
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  result->methods= mysql->methods;
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  result->field_alloc=mysql->field_alloc;
  mysql->fields=0;
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  result->field_count = mysql->field_count;
  result->fields= fields;
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  result->eof=1;
  DBUG_RETURN(result);
}

/* List all running processes (threads) in server */

MYSQL_RES * STDCALL
mysql_list_processes(MYSQL *mysql)
{
  MYSQL_DATA *fields;
  uint field_count;
  uchar *pos;
  DBUG_ENTER("mysql_list_processes");

  LINT_INIT(fields);
  if (simple_command(mysql,COM_PROCESS_INFO,0,0,0))
    DBUG_RETURN(0);
  free_old_query(mysql);
  pos=(uchar*) mysql->net.read_pos;
  field_count=(uint) net_field_length(&pos);
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  if (!(fields = (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*) 0,
					      protocol_41(mysql) ? 7 : 5)))
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    DBUG_RETURN(NULL);
  if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,field_count,0,
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				    mysql->server_capabilities)))
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    DBUG_RETURN(0);
  mysql->status=MYSQL_STATUS_GET_RESULT;
  mysql->field_count=field_count;
  DBUG_RETURN(mysql_store_result(mysql));
}

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#ifdef USE_OLD_FUNCTIONS
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int  STDCALL
mysql_create_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_createdb");
  DBUG_PRINT("enter",("db: %s",db));
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  DBUG_RETURN(simple_command(mysql,COM_CREATE_DB,db, (ulong) strlen(db),0));
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}


int  STDCALL
mysql_drop_db(MYSQL *mysql, const char *db)
{
  DBUG_ENTER("mysql_drop_db");
  DBUG_PRINT("enter",("db: %s",db));
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  DBUG_RETURN(simple_command(mysql,COM_DROP_DB,db,(ulong) strlen(db),0));
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}
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#endif
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int STDCALL
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mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level shutdown_level)
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{
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  uchar level[1];
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  DBUG_ENTER("mysql_shutdown");
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  level[0]= (uchar) shutdown_level;
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  DBUG_RETURN(simple_command(mysql, COM_SHUTDOWN, (char *)level, 1, 0));
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}


int STDCALL
mysql_refresh(MYSQL *mysql,uint options)
{
  uchar bits[1];
  DBUG_ENTER("mysql_refresh");
  bits[0]= (uchar) options;
  DBUG_RETURN(simple_command(mysql,COM_REFRESH,(char*) bits,1,0));
}

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int STDCALL
mysql_kill(MYSQL *mysql,ulong pid)
{
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  char buff[4];
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  DBUG_ENTER("mysql_kill");
  int4store(buff,pid);
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  DBUG_RETURN(simple_command(mysql,COM_PROCESS_KILL,buff,sizeof(buff),0));
}


int STDCALL
mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option)
{
  char buff[2];
  DBUG_ENTER("mysql_set_server_option");
  int2store(buff, (uint) option);
  DBUG_RETURN(simple_command(mysql, COM_SET_OPTION, buff, sizeof(buff), 0));
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}


int STDCALL
mysql_dump_debug_info(MYSQL *mysql)
{
  DBUG_ENTER("mysql_dump_debug_info");
  DBUG_RETURN(simple_command(mysql,COM_DEBUG,0,0,0));
}

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const char *cli_read_statistics(MYSQL *mysql)
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{
  mysql->net.read_pos[mysql->packet_length]=0;	/* End of stat string */
  if (!mysql->net.read_pos[0])
  {
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    strmov(mysql->net.sqlstate, unknown_sqlstate);
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    mysql->net.last_errno=CR_WRONG_HOST_INFO;
    strmov(mysql->net.last_error, ER(mysql->net.last_errno));
    return mysql->net.last_error;
  }
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  return (char*) mysql->net.read_pos;
}

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const char * STDCALL
mysql_stat(MYSQL *mysql)
{
  DBUG_ENTER("mysql_stat");
  if (simple_command(mysql,COM_STATISTICS,0,0,0))
    return mysql->net.last_error;
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  DBUG_RETURN((*mysql->methods->read_statistics)(mysql));
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}


int STDCALL
mysql_ping(MYSQL *mysql)
{
  DBUG_ENTER("mysql_ping");
  DBUG_RETURN(simple_command(mysql,COM_PING,0,0,0));
}


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const char * STDCALL
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mysql_get_server_info(MYSQL *mysql)
{
  return((char*) mysql->server_version);
}


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/*
  Get version number for server in a form easy to test on

  SYNOPSIS
    mysql_get_server_version()
    mysql		Connection

  EXAMPLE
    4.1.0-alfa ->  40100
  
  NOTES
    We will ensure that a newer server always has a bigger number.

  RETURN
   Signed number > 323000
*/

ulong STDCALL
mysql_get_server_version(MYSQL *mysql)
{
  uint major, minor, version;
  char *pos= mysql->server_version, *end_pos;
  major=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  minor=   (uint) strtoul(pos, &end_pos, 10);	pos=end_pos+1;
  version= (uint) strtoul(pos, &end_pos, 10);
  return (ulong) major*10000L+(ulong) (minor*100+version);
}


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const char * STDCALL
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mysql_get_host_info(MYSQL *mysql)
{
  return(mysql->host_info);
}


uint STDCALL
mysql_get_proto_info(MYSQL *mysql)
{
  return (mysql->protocol_version);
}

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const char * STDCALL
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mysql_get_client_info(void)
{
  return (char*) MYSQL_SERVER_VERSION;
}

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ulong STDCALL mysql_get_client_version(void)
{
  return MYSQL_VERSION_ID;
}

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my_bool STDCALL mysql_eof(MYSQL_RES *res)
{
  return res->eof;
}

MYSQL_FIELD * STDCALL mysql_fetch_field_direct(MYSQL_RES *res,uint fieldnr)
{
  return &(res)->fields[fieldnr];
}

MYSQL_FIELD * STDCALL mysql_fetch_fields(MYSQL_RES *res)
{
  return (res)->fields;
}

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MYSQL_ROW_OFFSET STDCALL mysql_row_tell(MYSQL_RES *res)
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{
  return res->data_cursor;
}

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MYSQL_FIELD_OFFSET STDCALL mysql_field_tell(MYSQL_RES *res)
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{
  return (res)->current_field;
}

/* MYSQL */

unsigned int STDCALL mysql_field_count(MYSQL *mysql)
{
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  return mysql->last_used_con->field_count;
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}

my_ulonglong STDCALL mysql_affected_rows(MYSQL *mysql)
{
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  return mysql->last_used_con->affected_rows;
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}

my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql)
{
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  return mysql->last_used_con->insert_id;
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}

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const char *STDCALL mysql_sqlstate(MYSQL *mysql)
{
  return mysql->net.sqlstate;
}

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uint STDCALL mysql_warning_count(MYSQL *mysql)
{
  return mysql->warning_count;
}

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const char *STDCALL mysql_info(MYSQL *mysql)
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{
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  return mysql->info;
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}

ulong STDCALL mysql_thread_id(MYSQL *mysql)
{
  return (mysql)->thread_id;
}

const char * STDCALL mysql_character_set_name(MYSQL *mysql)
{
  return mysql->charset->name;
}


uint STDCALL mysql_thread_safe(void)
{
#ifdef THREAD
  return 1;
#else
  return 0;
#endif
}

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my_bool STDCALL mysql_embedded(void)
{
#ifdef EMBEDDED_LIBRARY
  return 1;
#else
  return 0;
#endif
}

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/****************************************************************************
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  Some support functions
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****************************************************************************/

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/*
  Functions called my my_net_init() to set some application specific variables
*/

void my_net_local_init(NET *net)
{
  net->max_packet=   (uint) net_buffer_length;
  net->read_timeout= (uint) net_read_timeout;
  net->write_timeout=(uint) net_write_timeout;
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  net->retry_count=  1;
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  net->max_packet_size= max(net_buffer_length, max_allowed_packet);
}

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/*
  This function is used to create HEX string that you
  can use in a SQL statement in of the either ways:
    INSERT INTO blob_column VALUES (0xAABBCC);  (any MySQL version)
    INSERT INTO blob_column VALUES (X'AABBCC'); (4.1 and higher)
  
  The string in "from" is encoded to a HEX string.
  The result is placed in "to" and a terminating null byte is appended.
  
  The string pointed to by "from" must be "length" bytes long.
  You must allocate the "to" buffer to be at least length*2+1 bytes long.
  Each character needs two bytes, and you need room for the terminating
  null byte. When mysql_hex_string() returns, the contents of "to" will
  be a null-terminated string. The return value is the length of the
  encoded string, not including the terminating null character.

  The return value does not contain any leading 0x or a leading X' and
  trailing '. The caller must supply whichever of those is desired.
*/

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ulong STDCALL
mysql_hex_string(char *to, const char *from, ulong length)
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{
  char *to0= to;
  const char *end;
            
  for (end= from + length; from < end; from++)
  {
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    *to++= _dig_vec_upper[((unsigned char) *from) >> 4];
    *to++= _dig_vec_upper[((unsigned char) *from) & 0x0F];
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  }
  *to= '\0';
  return (ulong) (to-to0);
}

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/*
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  Add escape characters to a string (blob?) to make it suitable for a insert
  to should at least have place for length*2+1 chars
  Returns the length of the to string
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*/

ulong STDCALL
mysql_escape_string(char *to,const char *from,ulong length)
{
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  return escape_string_for_mysql(default_charset_info, to, from, length);
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}

ulong STDCALL
mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
			 ulong length)
{
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  return escape_string_for_mysql(mysql->charset, to, from, length);
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}


char * STDCALL
mysql_odbc_escape_string(MYSQL *mysql,
			 char *to, ulong to_length,
			 const char *from, ulong from_length,
			 void *param,
			 char * (*extend_buffer)
			 (void *, char *, ulong *))
{
  char *to_end=to+to_length-5;
  const char *end;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
#endif

  for (end=from+from_length; from != end ; from++)
  {
    if (to >= to_end)
    {
      to_length = (ulong) (end-from)+512;	/* We want this much more */
      if (!(to=(*extend_buffer)(param, to, &to_length)))
	return to;
      to_end=to+to_length-5;
    }
#ifdef USE_MB
    {
      int l;
      if (use_mb_flag && (l = my_ismbchar(mysql->charset, from, end)))
      {
	while (l--)
	  *to++ = *from++;
	from--;
	continue;
      }
    }
#endif
    switch (*from) {
    case 0:				/* Must be escaped for 'mysql' */
      *to++= '\\';
      *to++= '0';
      break;
    case '\n':				/* Must be escaped for logs */
      *to++= '\\';
      *to++= 'n';
      break;
    case '\r':
      *to++= '\\';
      *to++= 'r';
      break;
    case '\\':
      *to++= '\\';
      *to++= '\\';
      break;
    case '\'':
      *to++= '\\';
      *to++= '\'';
      break;
    case '"':				/* Better safe than sorry */
      *to++= '\\';
      *to++= '"';
      break;
    case '\032':			/* This gives problems on Win32 */
      *to++= '\\';
      *to++= 'Z';
      break;
    default:
      *to++= *from;
    }
  }
  return to;
}

void STDCALL
myodbc_remove_escape(MYSQL *mysql,char *name)
{
  char *to;
#ifdef USE_MB
  my_bool use_mb_flag=use_mb(mysql->charset);
  char *end;
  LINT_INIT(end);
  if (use_mb_flag)
    for (end=name; *end ; end++) ;
#endif

  for (to=name ; *name ; name++)
  {
#ifdef USE_MB
    int l;
    if (use_mb_flag && (l = my_ismbchar( mysql->charset, name , end ) ) )
    {
      while (l--)
	*to++ = *name++;
      name--;
      continue;
    }
#endif
    if (*name == '\\' && name[1])
      name++;
    *to++= *name;
  }
  *to=0;
}
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/********************************************************************
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 Implementation of new client API for 4.1 version.
1709

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 mysql_stmt_* are real prototypes used by applications.
1711

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 To make API work in embedded library all functions performing
 real I/O are prefixed with 'cli_' (abbreviated from 'Call Level
 Interface'). This functions are invoked via pointers set in
 MYSQL::methods structure. Embedded counterparts, prefixed with
 'emb_' reside in libmysqld/lib_sql.cc.
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*********************************************************************/

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/******************* Declarations ***********************************/
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1721

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/*
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  These functions are called by function pointer MYSQL_STMT::read_row_func.
  Each function corresponds to one of the read methods:
  - mysql_stmt_fetch without prior mysql_stmt_store_result,
  - mysql_stmt_fetch when result is stored,
  - mysql_stmt_fetch when there are no rows (always returns MYSQL_NO_DATA)
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*/

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static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row);
static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row);
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static int stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row);
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static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);
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/*
  This function is used in mysql_stmt_store_result if
  STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
*/
static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data);
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static bool setup_one_fetch_function(MYSQL_BIND *bind, MYSQL_FIELD *field);
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/*
  Maximum sizes of MYSQL_TYPE_DATE, MYSQL_TYPE_TIME, MYSQL_TYPE_DATETIME
  values stored in network buffer.
*/

/* 1 (length) + 2 (year) + 1 (month) + 1 (day) */
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#define MAX_DATE_REP_LENGTH 5
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/*
  1 (length) + 1 (is negative) + 4 (day count) + 1 (hour)
  + 1 (minute) + 1 (seconds) + 4 (microseconds)
*/
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#define MAX_TIME_REP_LENGTH 13
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/*
  1 (length) + 2 (year) + 1 (month) + 1 (day) +
  1 (hour) + 1 (minute) + 1 (second) + 4 (microseconds)
*/
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#define MAX_DATETIME_REP_LENGTH 12
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#define MAX_DOUBLE_STRING_REP_LENGTH 331
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/* A macro to check truncation errors */

#define IS_TRUNCATED(value, is_unsigned, min, max, umax) \
        ((is_unsigned) ? (((value) > (umax) || (value) < 0) ? 1 : 0) : \
                         (((value) > (max)  || (value) < (min)) ? 1 : 0))

#define BIND_RESULT_DONE 1
/*
  We report truncations only if at least one of MYSQL_BIND::error
  pointers is set. In this case stmt->bind_result_done |-ed with
  this flag.
*/
#define REPORT_DATA_TRUNCATION 2

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/**************** Misc utility functions ****************************/
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/*
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  Reallocate the NET package to have at least length bytes available.
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  SYNPOSIS
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    my_realloc_str()
    net                 The NET structure to modify.
    length              Ensure that net->buff has space for at least
                        this number of bytes.
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  RETURN VALUES
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    0   Success.
    1   Error, i.e. out of memory or requested packet size is bigger
        than max_allowed_packet. The error code is stored in net->last_errno.
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*/

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static my_bool my_realloc_str(NET *net, ulong length)
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{
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  ulong buf_length= (ulong) (net->write_pos - net->buff);
  my_bool res=0;
  DBUG_ENTER("my_realloc_str");
  if (buf_length + length > net->max_packet)
1801
  {
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    res= net_realloc(net, buf_length + length);
    net->write_pos= net->buff+ buf_length;
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  }
1805
  DBUG_RETURN(res);
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}


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/*
  Set statement error code, sqlstate, and error message
  from given errcode and sqlstate.
*/

static void set_stmt_error(MYSQL_STMT * stmt, int errcode,
                           const char *sqlstate)
{
  DBUG_ENTER("set_stmt_error");
  DBUG_PRINT("enter", ("error: %d '%s'", errcode, ER(errcode)));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  strmov(stmt->last_error, ER(errcode));
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}


/*
  Set statement error code, sqlstate, and error message.
*/

void set_stmt_errmsg(MYSQL_STMT * stmt, const char *err, int errcode,
                     const char *sqlstate)
{
  DBUG_ENTER("set_stmt_errmsg");
  DBUG_PRINT("enter", ("error: %d/%s '%s'", errcode, sqlstate, err));
  DBUG_ASSERT(stmt != 0);

  stmt->last_errno= errcode;
  if (err && err[0])
    strmov(stmt->last_error, err);
  strmov(stmt->sqlstate, sqlstate);

  DBUG_VOID_RETURN;
}
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/*
1849 1850
  Read and unpack server reply to COM_PREPARE command (sent from
  mysql_stmt_prepare).
1851

1852 1853 1854 1855
  SYNOPSIS
    cli_read_prepare_result()
    mysql   connection handle
    stmt    statement handle
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  RETURN VALUES
    0	ok
    1	error
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*/

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my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
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{
  uchar *pos;
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  uint field_count, param_count;
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  MYSQL_DATA *fields_data;
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  DBUG_ENTER("read_prepare_result");
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  mysql= mysql->last_used_con;
1870
  if (net_safe_read(mysql) == packet_error)
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    DBUG_RETURN(1);
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1873
  pos= (uchar*) mysql->net.read_pos;
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  stmt->stmt_id= uint4korr(pos+1); pos+= 5;
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  /* Number of columns in result set */
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  field_count=   uint2korr(pos);   pos+= 2;
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  /* Number of placeholders in the statement */
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  param_count=   uint2korr(pos);   pos+= 2;
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1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
  if (param_count != 0)
  {
    MYSQL_DATA *param_data;

    /* skip parameters data: we don't support it yet */
    if (!(param_data= (*mysql->methods->read_rows)(mysql, (MYSQL_FIELD*)0, 7)))
      DBUG_RETURN(1);
    free_rows(param_data);
  }

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  if (field_count != 0)
  {
    if (!(mysql->server_status & SERVER_STATUS_AUTOCOMMIT))
      mysql->server_status|= SERVER_STATUS_IN_TRANS;
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    mysql->extra_info= net_field_length_ll(&pos);
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    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
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      DBUG_RETURN(1);
    if (!(stmt->fields= unpack_fields(fields_data,&stmt->mem_root,
				      field_count,0,
				      mysql->server_capabilities)))
      DBUG_RETURN(1);
  }
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  stmt->field_count=  (uint) field_count;
  stmt->param_count=  (ulong) param_count;
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  mysql->warning_count= 0;
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  DBUG_RETURN(0);
}


/*
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  Allocate memory and init prepared statement structure.

1914 1915
  SYNOPSIS
    mysql_stmt_init()
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    mysql   connection handle

  DESCRIPTION
    This is an entry point of the new API. Returned handle stands for
    a server-side prepared statement. Memory for this structure (~700
    bytes) is allocated using 'malloc'. Once created, the handle can be
    reused many times. Created statement handle is bound to connection
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    handle provided to this call: its lifetime is limited by lifetime
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    of connection.
    'mysql_stmt_init()' is a pure local call, server side structure is
    created only in mysql_stmt_prepare.
    Next steps you may want to make:
    - set a statement attribute (mysql_stmt_attr_set()),
    - prepare statement handle with a query (mysql_stmt_prepare()),
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    - close statement handle and free its memory (mysql_stmt_close()),
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    - reset statement with mysql_stmt_reset() (a no-op which will
      just return).
    Behaviour of the rest of API calls on this statement is not defined yet
    (though we're working on making each wrong call sequence return
    error).
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  RETURN VALUE
    statement structure upon success and NULL if out of
    memory
*/

MYSQL_STMT * STDCALL
mysql_stmt_init(MYSQL *mysql)
{
  MYSQL_STMT *stmt;
  DBUG_ENTER("mysql_stmt_init");

  if (!(stmt= (MYSQL_STMT *) my_malloc(sizeof(MYSQL_STMT),
                                       MYF(MY_WME | MY_ZEROFILL))))
  {
    set_mysql_error(mysql, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }

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  init_alloc_root(&stmt->mem_root, 2048, 2048);
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  init_alloc_root(&stmt->result.alloc, 4096, 4096);
  stmt->result.alloc.min_malloc= sizeof(MYSQL_ROWS);
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  mysql->stmts= list_add(mysql->stmts, &stmt->list);
  stmt->list.data= stmt;
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  stmt->state= MYSQL_STMT_INIT_DONE;
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  stmt->mysql= mysql;
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  stmt->read_row_func= stmt_read_row_no_data;
  /* The rest of statement members was bzeroed inside malloc */
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  DBUG_RETURN(stmt);
}

1968

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/*
1970 1971
  Prepare server side statement with query.

1972 1973
  SYNOPSIS
    mysql_stmt_prepare()
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    stmt    statement handle
    query   statement to prepare
    length  statement length
1977 1978

  DESCRIPTION
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    Associate statement with statement handle. This is done both on
    client and server sides. At this point the server parses given query
    and creates an internal structure to represent it.
    Next steps you may want to make:
    - find out if this statement returns a result set by
      calling mysql_stmt_field_count(), and get result set metadata
      with mysql_stmt_result_metadata(),
    - if query contains placeholders, bind input parameters to placeholders
      using mysql_stmt_bind_param(),
    - otherwise proceed directly to mysql_stmt_execute().

  IMPLEMENTATION NOTES
  - if this is a re-prepare of the statement, first close previous data
1992
    structure on the server and free old statement data
1993
  - then send the query to server and get back number of placeholders,
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    number of columns in result set (if any), and result set metadata.
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    At the same time allocate memory for input and output parameters
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    to have less checks in mysql_stmt_bind_{param, result}.
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  RETURN VALUES
    0  success
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   !0  error
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*/

2003 2004
int STDCALL
mysql_stmt_prepare(MYSQL_STMT *stmt, const char *query, ulong length)
2005
{
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  MYSQL *mysql= stmt->mysql;
  DBUG_ENTER("mysql_stmt_prepare");

2009
  if (!mysql)
2010
  {
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    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
2013
    DBUG_RETURN(1);
2014
  }
2015 2016 2017 2018

  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    /* This is second prepare with another statement */
2019
    char buff[MYSQL_STMT_HEADER];               /* 4 bytes - stmt id */
2020 2021 2022

    mysql_stmt_free_result(stmt);
    /*
2023
      These members must be reset for API to
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      function in case of error or misuse.
    */
    stmt->bind_param_done= stmt->bind_result_done= FALSE;
    stmt->param_count= stmt->field_count= 0;
    stmt->last_errno= 0;
    stmt->last_error[0]= '\0';
    free_root(&stmt->mem_root, MYF(MY_KEEP_PREALLOC));

    int4store(buff, stmt->stmt_id);
    /*
      If there was a 'use' result from another statement, or from
      mysql_use_result it won't be freed in mysql_stmt_free_result and
      we should get 'Commands out of sync' here.
    */
    if (simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1))
    {
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                      mysql->net.sqlstate);
      DBUG_RETURN(1);
    }
    stmt->state= MYSQL_STMT_INIT_DONE;
  }

2047 2048
  if (simple_command(mysql, COM_PREPARE, query, length, 1))
  {
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    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
    DBUG_RETURN(1);
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  }

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  if ((*mysql->methods->read_prepare_result)(mysql, stmt))
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  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
2058
    DBUG_RETURN(1);
2059
  }
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2061
  /*
2062
    alloc_root will return valid address even in case when param_count
2063 2064 2065 2066
    and field_count are zero. Thus we should never rely on stmt->bind
    or stmt->params when checking for existence of placeholders or
    result set.
  */
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  if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
						sizeof(MYSQL_BIND)*
2069
                                                (stmt->param_count +
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                                                 stmt->field_count))))
  {
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
2073
    DBUG_RETURN(1);
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  }
  stmt->bind= stmt->params + stmt->param_count;
2076
  stmt->state= MYSQL_STMT_PREPARE_DONE;
2077
  DBUG_PRINT("info", ("Parameter count: %ld", stmt->param_count));
2078
  DBUG_RETURN(0);
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}

2081
/*
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  Get result set metadata from reply to mysql_stmt_execute.
  This is used mainly for SHOW commands, as metadata for these
  commands is sent only with result set.
  To be removed when all commands will fully support prepared mode.
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*/

2088
static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
2089
{
2090 2091
  MYSQL_FIELD *fields, *field, *end;
  MEM_ROOT *alloc= &stmt->mem_root;
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2092
  MYSQL *mysql= stmt->mysql->last_used_con;
2093

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2094
  stmt->field_count= mysql->field_count;
2095

2096
  /*
2097
    Get the field information for non-select statements
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    like SHOW and DESCRIBE commands
  */
2100
  if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc,
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						 sizeof(MYSQL_FIELD) *
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						 stmt->field_count)) ||
      !(stmt->bind= (MYSQL_BIND *) alloc_root(alloc,
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					      sizeof(MYSQL_BIND) *
					      stmt->field_count)))
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    return 0;
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  for (fields= mysql->fields, end= fields+stmt->field_count,
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	 field= stmt->fields;
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       field && fields < end; fields++, field++)
  {
    field->db       = strdup_root(alloc,fields->db);
    field->table    = strdup_root(alloc,fields->table);
    field->org_table= strdup_root(alloc,fields->org_table);
    field->name     = strdup_root(alloc,fields->name);
    field->org_name = strdup_root(alloc,fields->org_name);
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    field->charsetnr= fields->charsetnr;
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    field->length   = fields->length;
    field->type     = fields->type;
    field->flags    = fields->flags;
    field->decimals = fields->decimals;
    field->def      = fields->def ? strdup_root(alloc,fields->def): 0;
    field->max_length= 0;
  }
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  return stmt->field_count;
}
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/*
  Update result set columns metadata if it was sent again in
  reply to COM_EXECUTE.
*/

static void update_stmt_fields(MYSQL_STMT *stmt)
{
  MYSQL_FIELD *field= stmt->mysql->fields;
  MYSQL_FIELD *field_end= field + stmt->field_count;
  MYSQL_FIELD *stmt_field= stmt->fields;
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  MYSQL_BIND *bind= stmt->bind_result_done ? stmt->bind : 0;
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  DBUG_ASSERT(stmt->field_count == stmt->mysql->field_count);

  for (; field < field_end; ++field, ++stmt_field)
  {
    stmt_field->charsetnr= field->charsetnr;
    stmt_field->length   = field->length;
    stmt_field->type     = field->type;
    stmt_field->flags    = field->flags;
    stmt_field->decimals = field->decimals;
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    if (bind)
    {
      /* Ignore return value: it should be 0 if bind_result succeeded. */
      (void) setup_one_fetch_function(bind++, stmt_field);
    }
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  }
}

2158
/*
2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177
  Returns prepared statement metadata in the form of a result set.

  SYNOPSIS
    mysql_stmt_result_metadata()
    stmt  statement handle

  DESCRIPTION
    This function should be used after mysql_stmt_execute().
    You can safely check that prepared statement has a result set by calling
    mysql_stmt_num_fields(): if number of fields is not zero, you can call
    this function to get fields metadata.
    Next steps you may want to make:
    - find out number of columns in result set by calling
      mysql_num_fields(res) (the same value is returned by
      mysql_stmt_num_fields)
    - fetch metadata for any column with mysql_fetch_field,
      mysql_fetch_field_direct, mysql_fetch_fields, mysql_field_seek.
    - free returned MYSQL_RES structure with mysql_free_result.
    - proceed to binding of output parameters.
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  RETURN
    NULL  statement contains no result set or out of memory.
          In the latter case you can retreive error message
          with mysql_stmt_error.
    MYSQL_RES  a result set with no rows
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*/

MYSQL_RES * STDCALL
2187
mysql_stmt_result_metadata(MYSQL_STMT *stmt)
2188 2189
{
  MYSQL_RES *result;
2190
  DBUG_ENTER("mysql_stmt_result_metadata");
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2192 2193 2194 2195 2196 2197 2198 2199 2200
  /*
    stmt->fields is only defined if stmt->field_count is not null;
    stmt->field_count is initialized in prepare.
  */
  if (!stmt->field_count)
     DBUG_RETURN(0);

  if (!(result=(MYSQL_RES*) my_malloc(sizeof(*result),
                                      MYF(MY_WME | MY_ZEROFILL))))
2201
  {
2202 2203 2204
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }
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2206 2207
  result->methods=	stmt->mysql->methods;
  result->eof=		1;                      /* Marker for buffered */
2208 2209
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
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  /* The rest of members of 'result' was bzeroed inside malloc */
2211
  DBUG_RETURN(result);
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}

2214

2215
/*
2216 2217
  Returns parameter columns meta information in the form of
  result set.
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230

  SYNOPSYS
    mysql_stmt_param_metadata()
    stmt    statement handle

  DESCRIPTION
    This function can be called after you prepared the statement handle
    with mysql_stmt_prepare().
    XXX: not implemented yet.

  RETURN
    MYSQL_RES on success, 0 if there is no metadata.
    Currently this function always returns 0.
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*/

MYSQL_RES * STDCALL
2234
mysql_stmt_param_metadata(MYSQL_STMT *stmt)
2235
{
2236
  DBUG_ENTER("mysql_stmt_param_metadata");
2237

2238 2239 2240 2241
  if (!stmt->param_count)
    DBUG_RETURN(0);

  /*
2242 2243
    TODO: Fix this when server sends the information.
    Till then keep a dummy prototype.
2244 2245 2246 2247 2248
  */
  DBUG_RETURN(0); 
}


2249 2250 2251 2252 2253 2254 2255 2256 2257 2258
/* Store type of parameter in network buffer. */

static void store_param_type(char **pos, MYSQL_BIND *param)
{
  uint typecode= param->buffer_type | (param->is_unsigned ? 32768 : 0);
  int2store(*pos, typecode);
  *pos+= 2;
}


2259 2260
/*
  Functions to store parameter data in network packet.
2261

2262 2263 2264 2265 2266
  SYNOPSIS
    store_param_xxx()
    net			MySQL NET connection
    param		MySQL bind param

2267
  DESCRIPTION
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    These funtions are invoked from mysql_stmt_execute() by
    MYSQL_BIND::store_param_func pointer. This pointer is set once per
    many executions in mysql_stmt_bind_param(). The caller must ensure
    that network buffer have enough capacity to store parameter
    (MYSQL_BIND::buffer_length contains needed number of bytes).
2273
*/
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static void store_param_tinyint(NET *net, MYSQL_BIND *param)
{
2277
  *(net->write_pos++)= *(uchar *) param->buffer;
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}

2280 2281 2282 2283 2284 2285
static void store_param_short(NET *net, MYSQL_BIND *param)
{
  short value= *(short*) param->buffer;
  int2store(net->write_pos,value);
  net->write_pos+=2;
}
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2287
static void store_param_int32(NET *net, MYSQL_BIND *param)
2288
{
2289 2290 2291 2292
  int32 value= *(int32*) param->buffer;
  int4store(net->write_pos,value);
  net->write_pos+=4;
}
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static void store_param_int64(NET *net, MYSQL_BIND *param)
{
  longlong value= *(longlong*) param->buffer;
  int8store(net->write_pos,value);
  net->write_pos+= 8;
}
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2301 2302 2303 2304 2305
static void store_param_float(NET *net, MYSQL_BIND *param)
{
  float value= *(float*) param->buffer;
  float4store(net->write_pos, value);
  net->write_pos+= 4;
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}

2308 2309 2310 2311 2312 2313
static void store_param_double(NET *net, MYSQL_BIND *param)
{
  double value= *(double*) param->buffer;
  float8store(net->write_pos, value);
  net->write_pos+= 8;
}
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static void store_param_time(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
2318
  char buff[MAX_TIME_REP_LENGTH], *pos;
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  uint length;

  pos= buff+1;
  pos[0]= tm->neg ? 1: 0;
  int4store(pos+1, tm->day);
  pos[5]= (uchar) tm->hour;
  pos[6]= (uchar) tm->minute;
  pos[7]= (uchar) tm->second;
  int4store(pos+8, tm->second_part);
  if (tm->second_part)
2329
    length= 12;
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  else if (tm->hour || tm->minute || tm->second || tm->day)
    length= 8;
  else
    length= 0;
2334
  buff[0]= (char) length++;
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  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
2341
  char buff[MAX_DATETIME_REP_LENGTH], *pos;
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  uint length;

  pos= buff+1;

  int2store(pos, tm->year);
  pos[2]= (uchar) tm->month;
  pos[3]= (uchar) tm->day;
  pos[4]= (uchar) tm->hour;
  pos[5]= (uchar) tm->minute;
  pos[6]= (uchar) tm->second;
  int4store(pos+7, tm->second_part);
  if (tm->second_part)
    length= 11;
  else if (tm->hour || tm->minute || tm->second)
    length= 7;
  else if (tm->year || tm->month || tm->day)
    length= 4;
  else
    length= 0;
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  buff[0]= (char) length++;
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  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void store_param_date(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  tm->hour= tm->minute= tm->second= 0;
  tm->second_part= 0;
  net_store_datetime(net, tm);
}

static void store_param_datetime(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  net_store_datetime(net, tm);
}
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2380
static void store_param_str(NET *net, MYSQL_BIND *param)
2381
{
2382 2383
  /* param->length is always set in mysql_stmt_bind_param */
  ulong length= *param->length;
2384 2385
  char *to= (char *) net_store_length((char *) net->write_pos, length);
  memcpy(to, param->buffer, length);
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  net->write_pos= (uchar*) to+length;
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}

2389

2390
/*
2391 2392 2393 2394 2395 2396 2397 2398 2399
  Mark if the parameter is NULL.

  SYNOPSIS
    store_param_null()
    net			MySQL NET connection
    param		MySQL bind param

  DESCRIPTION
    A data package starts with a string of bits where we set a bit
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    if a parameter is NULL. Unlike bit string in result set row, here
    we don't have reserved bits for OK/error packet.
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*/

2404
static void store_param_null(NET *net, MYSQL_BIND *param)
2405
{
2406
  uint pos= param->param_number;
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  net->buff[pos/8]|=  (uchar) (1 << (pos & 7));
2408
}
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/*
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  Store one parameter in network packet: data is read from
  client buffer and saved in network packet by means of one
  of store_param_xxxx functions.
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*/

2417
static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
2418
{
2419
  NET *net= &stmt->mysql->net;
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  DBUG_ENTER("store_param");
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  DBUG_PRINT("enter",("type: %d, buffer:%lx, length: %lu  is_null: %d",
		      param->buffer_type,
		      param->buffer ? param->buffer : "0", *param->length,
		      *param->is_null));

  if (*param->is_null)
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    store_param_null(net, param);
  else
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  {
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    /*
      Param->length should ALWAYS point to the correct length for the type
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      Either to the length pointer given by the user or param->buffer_length
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    */
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    if ((my_realloc_str(net, *param->length)))
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    {
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      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
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      DBUG_RETURN(1);
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    }
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    (*param->store_param_func)(net, param);
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  }
  DBUG_RETURN(0);
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}

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/*
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  Auxilary function to send COM_EXECUTE packet to server and read reply.
  Used from cli_stmt_execute, which is in turn used by mysql_stmt_execute.
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*/

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static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
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{
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  MYSQL *mysql= stmt->mysql;
  NET	*net= &mysql->net;
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  char buff[4 /* size of stmt id */ +
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            5 /* execution flags */];
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  DBUG_ENTER("execute");
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  DBUG_DUMP("packet", packet, length);
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  mysql->last_used_con= mysql;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
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  buff[4]= (char) stmt->flags;
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  int4store(buff+5, 1);                         /* iteration count */
  if (cli_advanced_command(mysql, COM_EXECUTE, buff, sizeof(buff),
                           packet, length, 1) ||
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      (*mysql->methods->read_query_result)(mysql))
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  {
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    set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
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    DBUG_RETURN(1);
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  }
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  stmt->affected_rows= mysql->affected_rows;
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  stmt->server_status= mysql->server_status;
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  stmt->insert_id= mysql->insert_id;
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  DBUG_RETURN(0);
}

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int cli_stmt_execute(MYSQL_STMT *stmt)
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{
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  DBUG_ENTER("cli_stmt_execute");
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  if (stmt->param_count)
  {
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    NET        *net= &stmt->mysql->net;
    MYSQL_BIND *param, *param_end;
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    char       *param_data;
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    ulong length;
    uint null_count;
    my_bool    result;
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    if (!stmt->bind_param_done)
    {
      set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
      DBUG_RETURN(1);
    }

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    net_clear(net);				/* Sets net->write_pos */
    /* Reserve place for null-marker bytes */
    null_count= (stmt->param_count+7) /8;
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    if (my_realloc_str(net, null_count + 1))
    {
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
      DBUG_RETURN(1);
    }
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    bzero((char*) net->write_pos, null_count);
    net->write_pos+= null_count;
    param_end= stmt->params + stmt->param_count;

    /* In case if buffers (type) altered, indicate to server */
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    *(net->write_pos)++= (uchar) stmt->send_types_to_server;
    if (stmt->send_types_to_server)
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    {
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      if (my_realloc_str(net, 2 * stmt->param_count))
      {
        set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
        DBUG_RETURN(1);
      }
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      /*
	Store types of parameters in first in first package
	that is sent to the server.
      */
      for (param= stmt->params;	param < param_end ; param++)
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        store_param_type((char**) &net->write_pos, param);
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    }

    for (param= stmt->params; param < param_end; param++)
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    {
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      /* check if mysql_stmt_send_long_data() was used */
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      if (param->long_data_used)
	param->long_data_used= 0;	/* Clear for next execute call */
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      else if (store_param(stmt, param))
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	DBUG_RETURN(1);
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    }
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    length= (ulong) (net->write_pos - net->buff);
    /* TODO: Look into avoding the following memdup */
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    if (!(param_data= my_memdup((const char*) net->buff, length, MYF(0))))
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    {
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      set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
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      DBUG_RETURN(1);
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    }
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    result= execute(stmt, param_data, length);
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    stmt->send_types_to_server=0;
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    my_free(param_data, MYF(MY_WME));
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    DBUG_RETURN(result);
  }
  DBUG_RETURN((int) execute(stmt,0,0));
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}

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/*
  Read one row from buffered result set.  Result set is created by prior
  call to mysql_stmt_store_result().
  SYNOPSIS
    stmt_read_row_buffered()

  RETURN VALUE
    0             - success; *row is set to valid row pointer (row data
                    is stored in result set buffer)
    MYSQL_NO_DATA - end of result set. *row is set to NULL
*/

static int stmt_read_row_buffered(MYSQL_STMT *stmt, unsigned char **row)
{
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  if (stmt->data_cursor)
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  {
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    *row= (uchar *) stmt->data_cursor->data;
    stmt->data_cursor= stmt->data_cursor->next;
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    return 0;
  }
  *row= 0;
  return MYSQL_NO_DATA;
}

/*
  Read one row from network: unbuffered non-cursor fetch.
  If last row was read, or error occured, erase this statement
  from record pointing to object unbuffered fetch is performed from.

  SYNOPSIS
    stmt_read_row_unbuffered()
    stmt  statement handle
    row   pointer to write pointer to row data;

  RETURN VALUE
    0           - success; *row contains valid address of a row;
                  row data is stored in network buffer
    1           - error; error code is written to
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                  stmt->last_{errno,error}; *row is not changed
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  MYSQL_NO_DATA - end of file was read from network;
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                  *row is set to NULL
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*/

static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
{
  int rc= 1;
  MYSQL *mysql= stmt->mysql;
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  /*
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    This function won't be called if stmt->field_count is zero
    or execution wasn't done: this is ensured by mysql_stmt_execute.
  */
  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
    return 1;
  }
  if (mysql->status != MYSQL_STATUS_GET_RESULT)
  {
    set_stmt_error(stmt, stmt->unbuffered_fetch_cancelled ?
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                   CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
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                   unknown_sqlstate);
    goto error;
  }
  if ((*mysql->methods->unbuffered_fetch)(mysql, (char**) row))
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
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    /*
      If there was an error, there are no more pending rows:
      reset statement status to not hang up in following
      mysql_stmt_close (it will try to flush result set before
      closing the statement).
    */
    mysql->status= MYSQL_STATUS_READY;
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    goto error;
  }
  if (!*row)
  {
    mysql->status= MYSQL_STATUS_READY;
    rc= MYSQL_NO_DATA;
    goto error;
  }
  return 0;
error:
  if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
    mysql->unbuffered_fetch_owner= 0;
  return rc;
}

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/*
  Fetch statement row using server side cursor.

  SYNOPSIS
    stmt_read_row_from_cursor()

  RETURN VALUE
    0            success
    1            error
  MYSQL_NO_DATA  end of data
*/

static int
stmt_read_row_from_cursor(MYSQL_STMT *stmt, unsigned char **row)
{
  if (stmt->data_cursor)
    return stmt_read_row_buffered(stmt, row);
  if (stmt->server_status & SERVER_STATUS_LAST_ROW_SENT)
    stmt->server_status &= ~SERVER_STATUS_LAST_ROW_SENT;
  else
  {
    MYSQL *mysql= stmt->mysql;
    NET *net= &mysql->net;
    MYSQL_DATA *result= &stmt->result;
    char buff[4 /* statement id */ +
              4 /* number of rows to fetch */];

    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    /* Send row request to the server */
    int4store(buff, stmt->stmt_id);
    int4store(buff + 4, 1); /* number of rows to fetch */
    if (cli_advanced_command(mysql, COM_FETCH, buff, sizeof(buff),
                             NullS, 0, 1))
    {
      set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
      return 1;
    }
    stmt->server_status= mysql->server_status;
    if (cli_read_binary_rows(stmt))
      return 1;
    stmt->server_status= mysql->server_status;

    stmt->data_cursor= result->data;
    return stmt_read_row_buffered(stmt, row);
  }
  *row= 0;
  return MYSQL_NO_DATA;
}


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/*
  Default read row function to not SIGSEGV in client in
  case of wrong sequence of API calls.
*/

static int
stmt_read_row_no_data(MYSQL_STMT *stmt  __attribute__((unused)),
                      unsigned char **row  __attribute__((unused)))
{
  if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
  {
    set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
    return 1;
  }
  return MYSQL_NO_DATA;
}

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/*
  Get/set statement attributes

  SYNOPSIS
    mysql_stmt_attr_get()
    mysql_stmt_attr_set()

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    attr_type  statement attribute
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    value      casted to const void * pointer to value.

  RETURN VALUE
    0 success
   !0 wrong attribute type
*/
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my_bool STDCALL mysql_stmt_attr_set(MYSQL_STMT *stmt,
                                    enum enum_stmt_attr_type attr_type,
                                    const void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
    stmt->update_max_length= value ? *(const my_bool*) value : 0;
    break;
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  case STMT_ATTR_CURSOR_TYPE:
    stmt->flags= value ? *(const unsigned long *) value : 0;
    break;
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  default:
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    return TRUE;
  }
  return FALSE;
}


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my_bool STDCALL mysql_stmt_attr_get(MYSQL_STMT *stmt,
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                                    enum enum_stmt_attr_type attr_type,
                                    void *value)
{
  switch (attr_type) {
  case STMT_ATTR_UPDATE_MAX_LENGTH:
    *(unsigned long *) value= stmt->update_max_length;
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    break;
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  case STMT_ATTR_CURSOR_TYPE:
    *(unsigned long *) value= stmt->flags;
      break;
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  default:
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    return TRUE;
  }
  return FALSE;
}


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/*
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  Send placeholders data to server (if there are placeholders)
  and execute prepared statement.

  SYNOPSIS
    mysql_stmt_execute()
    stmt  statement handle. The handle must be created
          with mysql_stmt_init() and prepared with
          mysql_stmt_prepare(). If there are placeholders
          in the statement they must be bound to local
          variables with mysql_stmt_bind_param().

  DESCRIPTION
    This function will automatically flush pending result
    set (if there is one), send parameters data to the server
    and read result of statement execution.
    If previous result set was cached with mysql_stmt_store_result()
    it will also be freed in the beginning of this call.
    The server can return 3 types of responses to this command:
    - error, can be retrieved with mysql_stmt_error()
    - ok, no result set pending. In this case we just update
      stmt->insert_id and stmt->affected_rows.
    - the query returns a result set: there could be 0 .. N
    rows in it. In this case the server can also send updated
    result set metadata.

    Next steps you may want to make:
    - find out if there is result set with mysql_stmt_field_count().
    If there is one:
    - optionally, cache entire result set on client to unblock
    connection with mysql_stmt_store_result()
    - bind client variables to result set columns and start read rows
    with mysql_stmt_fetch().
    - reset statement with mysql_stmt_reset() or close it with
    mysql_stmt_close()
    Otherwise:
    - find out last insert id and number of affected rows with
    mysql_stmt_insert_id(), mysql_stmt_affected_rows()

  RETURN
    0   success
    1   error, message can be retrieved with mysql_stmt_error().
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*/

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int STDCALL mysql_stmt_execute(MYSQL_STMT *stmt)
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{
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  MYSQL *mysql= stmt->mysql;
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  DBUG_ENTER("mysql_stmt_execute");
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  if (!mysql)
  {
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
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    DBUG_RETURN(1);
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  }

  mysql_stmt_free_result(stmt);
  /*
    No need to check for stmt->state: if the statement wasn't
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    prepared we'll get 'unknown statement handler' error from server.
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  */
  if (mysql->methods->stmt_execute(stmt))
    DBUG_RETURN(1);
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  if (mysql->field_count)
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  {
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    /* Server has sent result set metadata */
    if (stmt->field_count == 0)
    {
      /*
        This is 'SHOW'/'EXPLAIN'-like query. Current implementation of
        prepared statements can't send result set metadata for these queries
        on prepare stage. Read it now.
      */
      alloc_stmt_fields(stmt);
    }
    else
    {
      /*
        Update result set metadata if it for some reason changed between
        prepare and execute, i.e.:
        - in case of 'SELECT ?' we don't know column type unless data was
          supplied to mysql_stmt_execute, so updated column type is sent
          now.
        - if data dictionary changed between prepare and execute, for
          example a table used in the query was altered.
        Note, that now (4.1.3) we always send metadata in reply to
        COM_EXECUTE (even if it is not necessary), so either this or
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        previous branch always works.
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        TODO: send metadata only when it's really necessary and add a warning
        'Metadata changed' when it's sent twice.
      */
      update_stmt_fields(stmt);
    }
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  }
  stmt->state= MYSQL_STMT_EXECUTE_DONE;
  if (stmt->field_count)
  {
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    if (stmt->server_status & SERVER_STATUS_CURSOR_EXISTS)
    {
      mysql->status= MYSQL_STATUS_READY;
      stmt->read_row_func= stmt_read_row_from_cursor;
    }
    else
    {
      stmt->mysql->unbuffered_fetch_owner= &stmt->unbuffered_fetch_cancelled;
      stmt->unbuffered_fetch_cancelled= FALSE;
      stmt->read_row_func= stmt_read_row_unbuffered;
    }
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  }
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  DBUG_RETURN(0);
}

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/*
  Return total parameters count in the statement
*/

2875
ulong STDCALL mysql_stmt_param_count(MYSQL_STMT * stmt)
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{
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  DBUG_ENTER("mysql_stmt_param_count");
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  DBUG_RETURN(stmt->param_count);
}

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/*
  Return total affected rows from the last statement
*/

my_ulonglong STDCALL mysql_stmt_affected_rows(MYSQL_STMT *stmt)
{
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  return stmt->affected_rows;
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}
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/*
  Returns the number of result columns for the most recent query
  run on this statement.
*/

unsigned int STDCALL mysql_stmt_field_count(MYSQL_STMT *stmt)
{
  return stmt->field_count;
}

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/*
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  Return last inserted id for auto_increment columns.

  SYNOPSIS
    mysql_stmt_insert_id()
    stmt    statement handle

  DESCRIPTION
    Current implementation of this call has a caveat: stmt->insert_id is
    unconditionally updated from mysql->insert_id in the end of each
    mysql_stmt_execute(). This works OK if mysql->insert_id contains new
    value (sent in reply to mysql_stmt_execute()), otherwise stmt->insert_id
    value gets undefined, as it's updated from some arbitrary value saved in
    connection structure during some other call.
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*/

my_ulonglong STDCALL mysql_stmt_insert_id(MYSQL_STMT *stmt)
{
  return stmt->insert_id;
}

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static my_bool int_is_null_true= 1;		/* Used for MYSQL_TYPE_NULL */
static my_bool int_is_null_false= 0;

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/*
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  Set up input data buffers for a statement.
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  SYNOPSIS
    mysql_stmt_bind_param()
    stmt    statement handle
            The statement must be prepared with mysql_stmt_prepare().
    bind    Array of mysql_stmt_param_count() bind parameters.
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            This function doesn't check that size of this argument
            is >= mysql_stmt_field_count(): it's user's responsibility.

  DESCRIPTION
    Use this call after mysql_stmt_prepare() to bind user variables to
    placeholders.
    Each element of bind array stands for a placeholder. Placeholders
    are counted from 0.  For example statement
    'INSERT INTO t (a, b) VALUES (?, ?)'
    contains two placeholders, and for such statement you should supply
    bind array of two elements (MYSQL_BIND bind[2]).

    By properly initializing bind array you can bind virtually any
    C language type to statement's placeholders:
    First, it's strongly recommended to always zero-initialize entire
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    bind structure before setting its members. This will both shorten
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    your application code and make it robust to future extensions of
    MYSQL_BIND structure.
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    Then you need to assign typecode of your application buffer to
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    MYSQL_BIND::buffer_type. The following typecodes with their
    correspondence to C language types are supported:
    MYSQL_TYPE_TINY       for 8-bit integer variables. Normally it's
                          'signed char' and 'unsigned char';
    MYSQL_TYPE_SHORT      for 16-bit signed and unsigned variables. This
                          is usually 'short' and 'unsigned short';
    MYSQL_TYPE_LONG       for 32-bit signed and unsigned variables. It
                          corresponds to 'int' and 'unsigned int' on
                          vast majority of platforms. On IA-32 and some
                          other 32-bit systems you can also use 'long'
                          here;
    MYSQL_TYPE_LONGLONG   64-bit signed or unsigned integer.  Stands for
                          '[unsigned] long long' on most platforms;
    MYSQL_TYPE_FLOAT      32-bit floating point type, 'float' on most
                          systems;
    MYSQL_TYPE_DOUBLE     64-bit floating point type, 'double' on most
                          systems;
    MYSQL_TYPE_TIME       broken-down time stored in MYSQL_TIME
                          structure
    MYSQL_TYPE_DATE       date stored in MYSQL_TIME structure
    MYSQL_TYPE_DATETIME   datetime stored in MYSQL_TIME structure See
                          more on how to use these types for sending
                          dates and times below;
    MYSQL_TYPE_STRING     character string, assumed to be in
                          character-set-client. If character set of
                          client is not equal to character set of
                          column, value for this placeholder will be
                          converted to destination character set before
                          insert.
    MYSQL_TYPE_BLOB       sequence of bytes. This sequence is assumed to
                          be in binary character set (which is the same
                          as no particular character set), and is never
                          converted to any other character set. See also
                          notes about supplying string/blob length
                          below.
    MYSQL_TYPE_NULL       special typecode for binding nulls.
    These C/C++ types are not supported yet by the API: long double,
    bool.

    As you can see from the list above, it's responsibility of
    application programmer to ensure that chosen typecode properly
    corresponds to host language type. For example on all platforms
    where we build MySQL packages (as of MySQL 4.1.4) int is a 32-bit
    type. So for int you can always assume that proper typecode is
    MYSQL_TYPE_LONG (however queer it sounds, the name is legacy of the
    old MySQL API). In contrary sizeof(long) can be 4 or 8 8-bit bytes,
    depending on platform.

    TODO: provide client typedefs for each integer and floating point
    typecode, i. e. int8, uint8, float32, etc.

    Once typecode was set, it's necessary to assign MYSQL_BIND::buffer
    to point to the buffer of given type. Finally, additional actions
    may be taken for some types or use cases:

      Binding integer types.
    For integer types you might also need to set MYSQL_BIND::is_unsigned
    member. Set it to TRUE when binding unsigned char, unsigned short,
    unsigned int, unsigned long, unsigned long long.

      Binding floating point types.
    For floating point types you just need to set
    MYSQL_BIND::buffer_type and MYSQL_BIND::buffer. The rest of the
    members should be zero-initialized.

      Binding NULLs.
    You might have a column always NULL, never NULL, or sometimes NULL.
    For an always NULL column set MYSQL_BIND::buffer_type to
    MYSQL_TYPE_NULL.  The rest of the members just need to be
    zero-initialized.  For never NULL columns set MYSQL_BIND::is_null to
    0, or this has already been done if you zero-initialized the entire
    structure.  If you set MYSQL_TYPE::is_null to point to an
    application buffer of type 'my_bool', then this buffer will be
    checked on each execution: this way you can set the buffer to TRUE,
    or any non-0 value for NULLs, and to FALSE or 0 for not NULL data.

      Binding text strings and sequences of bytes.
    For strings, in addition to MYSQL_BIND::buffer_type and
    MYSQL_BIND::buffer you need to set MYSQL_BIND::length or
    MYSQL_BIND::buffer_length.
    If 'length' is set, 'buffer_length' is ignored. 'buffer_length'
    member should be used when size of string doesn't change between
    executions. If you want to vary buffer length for each value, set
    'length' to point to an application buffer of type 'unsigned long'
    and set this long to length of the string before each
    mysql_stmt_execute().

      Binding dates and times.
    For binding dates and times prepared statements API provides clients
    with MYSQL_TIME structure. A pointer to instance of this structure
    should be assigned to MYSQL_BIND::buffer whenever MYSQL_TYPE_TIME,
    MYSQL_TYPE_DATE, MYSQL_TYPE_DATETIME typecodes are used.  When
    typecode is MYSQL_TYPE_TIME, only members 'hour', 'minute', 'second'
    and 'neg' (is time offset negative) are used. These members only
    will be sent to the server.
    MYSQL_TYPE_DATE implies use of 'year', 'month', 'day', 'neg'.
    MYSQL_TYPE_DATETIME utilizes both parts of MYSQL_TIME structure.
    You don't have to set MYSQL_TIME::time_type member: it's not used
    when sending data to the server, typecode information is enough.
    'second_part' member can hold microsecond precision of time value,
    but now it's only supported on protocol level: you can't store
    microsecond in a column, or use in temporal calculations. However,
    if you send a time value with microsecond part for 'SELECT ?',
    statement, you'll get it back unchanged from the server.

      Data conversion.
    If conversion from host language type to data representation,
    corresponding to SQL type, is required it's done on the server.
    Data truncation is possible when conversion is lossy. For example,
    if you supply MYSQL_TYPE_DATETIME value out of valid SQL type
    TIMESTAMP range, the same conversion will be applied as if this
    value would have been sent as string in the old protocol.
    TODO: document how the server will behave in case of truncation/data
    loss.

    After variables were bound, you can repeatedly set/change their
    values and mysql_stmt_execute() the statement.

    See also: mysql_stmt_send_long_data() for sending long text/blob
    data in pieces, examples in tests/client_test.c.
    Next steps you might want to make:
    - execute statement with mysql_stmt_execute(),
    - reset statement using mysql_stmt_reset() or reprepare it with
      another query using mysql_stmt_prepare()
    - close statement with mysql_stmt_close().

  IMPLEMENTATION
    The function copies given bind array to internal storage of the
    statement, and sets up typecode-specific handlers to perform
    serialization of bound data. This means that although you don't need
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    to call this routine after each assignment to bind buffers, you
    need to call it each time you change parameter typecodes, or other
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    members of MYSQL_BIND array.
    This is a pure local call. Data types of client buffers are sent
    along with buffers' data at first execution of the statement.
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  RETURN
    0  success
    1  error, can be retrieved with mysql_stmt_error.
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*/

3095
my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND *bind)
3096
{
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  uint count=0;
  MYSQL_BIND *param, *end;
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  DBUG_ENTER("mysql_stmt_bind_param");
3100

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  if (!stmt->param_count)
  {
    if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    {
      set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
      DBUG_RETURN(1);
    }
    DBUG_RETURN(0);
  }

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  /* Allocated on prepare */
  memcpy((char*) stmt->params, (char*) bind,
	 sizeof(MYSQL_BIND) * stmt->param_count);

  for (param= stmt->params, end= param+stmt->param_count;
       param < end ;
       param++)
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  {
3119
    param->param_number= count++;
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    param->long_data_used= 0;

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    /* If param->is_null is not set, then the value can never be NULL */
    if (!param->is_null)
      param->is_null= &int_is_null_false;

3126 3127
    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
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    case MYSQL_TYPE_NULL:
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      param->is_null= &int_is_null_true;
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      break;
3131
    case MYSQL_TYPE_TINY:
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      /* Force param->length as this is fixed for this type */
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      param->length= &param->buffer_length;
      param->buffer_length= 1;
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      param->store_param_func= store_param_tinyint;
      break;
    case MYSQL_TYPE_SHORT:
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      param->length= &param->buffer_length;
      param->buffer_length= 2;
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      param->store_param_func= store_param_short;
      break;
    case MYSQL_TYPE_LONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_int32;
      break;
    case MYSQL_TYPE_LONGLONG:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
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      param->store_param_func= store_param_int64;
      break;
    case MYSQL_TYPE_FLOAT:
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      param->length= &param->buffer_length;
      param->buffer_length= 4;
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      param->store_param_func= store_param_float;
      break;
    case MYSQL_TYPE_DOUBLE:
3158 3159
      param->length= &param->buffer_length;
      param->buffer_length= 8;
3160 3161
      param->store_param_func= store_param_double;
      break;
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    case MYSQL_TYPE_TIME:
      param->store_param_func= store_param_time;
3164
      param->buffer_length= MAX_TIME_REP_LENGTH;
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      break;
    case MYSQL_TYPE_DATE:
      param->store_param_func= store_param_date;
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      param->buffer_length= MAX_DATE_REP_LENGTH;
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      break;
    case MYSQL_TYPE_DATETIME:
    case MYSQL_TYPE_TIMESTAMP:
      param->store_param_func= store_param_datetime;
3173
      param->buffer_length= MAX_DATETIME_REP_LENGTH;
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      break;
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    case MYSQL_TYPE_TINY_BLOB:
    case MYSQL_TYPE_MEDIUM_BLOB:
    case MYSQL_TYPE_LONG_BLOB:
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    case MYSQL_TYPE_BLOB:
3179
    case MYSQL_TYPE_VARCHAR:
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    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
      param->store_param_func= store_param_str;
3183
      /*
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        For variable length types user must set either length or
        buffer_length.
3186
      */
3187 3188
      break;
    default:
3189
      strmov(stmt->sqlstate, unknown_sqlstate);
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      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
3192
	      param->buffer_type, count);
3193
      DBUG_RETURN(1);
3194
    }
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    /*
      If param->length is not given, change it to point to buffer_length.
      This way we can always use *param->length to get the length of data
    */
    if (!param->length)
      param->length= &param->buffer_length;
3201
  }
3202
  /* We have to send/resend type information to MySQL */
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  stmt->send_types_to_server= TRUE;
  stmt->bind_param_done= TRUE;
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  DBUG_RETURN(0);
}

3208

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/********************************************************************
 Long data implementation
*********************************************************************/

/*
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  Send long data in pieces to the server

  SYNOPSIS
3217
    mysql_stmt_send_long_data()
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    stmt			Statement handler
    param_number		Parameter number (0 - N-1)
    data			Data to send to server
    length			Length of data to send (may be 0)
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3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246
  DESCRIPTION
    This call can be used repeatedly to send long data in pieces
    for any string/binary placeholder. Data supplied for
    a placeholder is saved at server side till execute, and then
    used instead of value from MYSQL_BIND object. More precisely,
    if long data for a parameter was supplied, MYSQL_BIND object
    corresponding to this parameter is not sent to server. In the
    end of execution long data states of placeholders are reset,
    so next time values of such placeholders will be taken again
    from MYSQL_BIND array.
    The server does not reply to this call: if there was an error
    in data handling (which now only can happen if server run out
    of memory) it would be returned in reply to
    mysql_stmt_execute().
    You should choose type of long data carefully if you care
    about character set conversions performed by server when the
    statement is executed.  No conversion is performed at all for
    MYSQL_TYPE_BLOB and other binary typecodes. For
    MYSQL_TYPE_STRING and the rest of text placeholders data is
    converted from client character set to character set of
    connection. If these character sets are different, this
    conversion may require additional memory at server, equal to
    total size of supplied pieces.

3247
  RETURN VALUES
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    0	ok
    1	error
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*/

3252
my_bool STDCALL
3253
mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
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		     const char *data, ulong length)
3255 3256
{
  MYSQL_BIND *param;
3257
  DBUG_ENTER("mysql_stmt_send_long_data");
3258
  DBUG_ASSERT(stmt != 0);
3259
  DBUG_PRINT("enter",("param no : %d, data : %lx, length : %ld",
3260
		      param_number, data, length));
3261

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  /*
    We only need to check for stmt->param_count, if it's not null
    prepare was done.
  */
  if (param_number >= stmt->param_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }
3271

3272
  param= stmt->params+param_number;
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  if (param->buffer_type < MYSQL_TYPE_TINY_BLOB ||
      param->buffer_type > MYSQL_TYPE_STRING)
  {
3276
    /* Long data handling should be used only for string/binary types */
3277
    strmov(stmt->sqlstate, unknown_sqlstate);
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    sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
	    param->param_number);
    DBUG_RETURN(1);
  }
3282

3283
  /*
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    Send long data packet if there is data or we're sending long data
    for the first time.
  */
3287
  if (length || param->long_data_used == 0)
3288
  {
3289
    MYSQL *mysql= stmt->mysql;
3290
    /* Packet header: stmt id (4 bytes), param no (2 bytes) */
3291 3292
    char buff[MYSQL_LONG_DATA_HEADER];

3293 3294
    int4store(buff, stmt->stmt_id);
    int2store(buff + 4, param_number);
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    param->long_data_used= 1;

3297 3298 3299 3300
    /*
      Note that we don't get any ok packet from the server in this case
      This is intentional to save bandwidth.
    */
3301 3302
    if ((*mysql->methods->advanced_command)(mysql, COM_LONG_DATA, buff,
					    sizeof(buff), data, length, 1))
3303
    {
3304 3305
      set_stmt_errmsg(stmt, mysql->net.last_error,
		      mysql->net.last_errno, mysql->net.sqlstate);
3306 3307 3308 3309 3310 3311
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}

3312

3313
/********************************************************************
3314
 Fetch and conversion of result set rows (binary protocol).
3315 3316
*********************************************************************/

3317 3318 3319 3320 3321 3322 3323 3324
/*
  Read date, (time, datetime) value from network buffer and store it
  in MYSQL_TIME structure.

  SYNOPSIS
    read_binary_{date,time,datetime}()
    tm    MYSQL_TIME structure to fill
    pos   pointer to current position in network buffer.
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          These functions increase pos to point to the beginning of the
          next column.
3327 3328 3329 3330 3331 3332

  Auxiliary functions to read time (date, datetime) values from network
  buffer and store in MYSQL_TIME structure. Jointly used by conversion
  and no-conversion fetching.
*/

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static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
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3334
{
3335
  /* net_field_length will set pos to the first byte of data */
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  uint length= net_field_length(pos);

  if (length)
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  {
    uchar *to= *pos;
    tm->neg= (bool) to[0];
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3342

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    tm->day=    (ulong) sint4korr(to+1);
    tm->hour=   (uint) to[5];
    tm->minute= (uint) to[6];
    tm->second= (uint) to[7];
    tm->second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
    tm->year= tm->month= 0;
3349 3350 3351 3352 3353 3354
    if (tm->day)
    {
      /* Convert days to hours at once */
      tm->hour+= tm->day*24;
      tm->day= 0;
    }
3355 3356
    tm->time_type= MYSQL_TIMESTAMP_TIME;

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    *pos+= length;
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  }
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  else
3360
    set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
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}

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static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
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{
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  uint length= net_field_length(pos);
3366

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  if (length)
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  {
    uchar *to= *pos;
3370

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    tm->neg=    0;
    tm->year=   (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day=    (uint) to[3];
3375

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    if (length > 4)
    {
      tm->hour=   (uint) to[4];
      tm->minute= (uint) to[5];
      tm->second= (uint) to[6];
    }
    else
      tm->hour= tm->minute= tm->second= 0;
    tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
3385
    tm->time_type= MYSQL_TIMESTAMP_DATETIME;
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    *pos+= length;
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  }
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  else
3390
    set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
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}

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3393
static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
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3394
{
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  uint length= net_field_length(pos);
3396

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  if (length)
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  {
    uchar *to= *pos;
    tm->year =  (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day= (uint) to[3];
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3403

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3404 3405 3406
    tm->hour= tm->minute= tm->second= 0;
    tm->second_part= 0;
    tm->neg= 0;
3407
    tm->time_type= MYSQL_TIMESTAMP_DATE;
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    *pos+= length;
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  }
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  else
3412
    set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
3413 3414
}

3415

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/*
  Convert string to supplied buffer of any type.

  SYNOPSIS
    fetch_string_with_conversion()
    param   output buffer descriptor
    value   column data
    length  data length
*/
3425

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static void fetch_string_with_conversion(MYSQL_BIND *param, char *value,
                                         uint length)
3428
{
3429
  char *buffer= (char *)param->buffer;
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  int err= 0;
3431
  char *endptr;
3432

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  /*
    This function should support all target buffer types: the rest
    of conversion functions can delegate conversion to it.
  */
  switch(param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3440
  case MYSQL_TYPE_TINY:
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  {
3442 3443 3444
    longlong data= my_strntoll(&my_charset_latin1, value, length, 10,
                                 &endptr, &err);
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3445
                                 INT_MIN8, INT_MAX8, UINT_MAX8) |
3446 3447
                    test(err));
    *buffer= (uchar) data;
3448
    break;
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3449
  }
3450
  case MYSQL_TYPE_SHORT:
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3451
  {
3452 3453 3454
    longlong data= my_strntoll(&my_charset_latin1, value, length, 10,
                               &endptr, &err);
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3455
                                 INT_MIN16, INT_MAX16, UINT_MAX16) |
3456 3457
                    test(err));
    shortstore(buffer, (short) data);
3458
    break;
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3459
  }
3460
  case MYSQL_TYPE_LONG:
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3461
  {
3462 3463 3464
    longlong data= my_strntoll(&my_charset_latin1, value, length, 10,
                               &endptr, &err);
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3465
                                 INT_MIN32, INT_MAX32, UINT_MAX32) |
3466 3467
                    test(err));
    longstore(buffer, (int32) data);
3468
    break;
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3469
  }
3470
  case MYSQL_TYPE_LONGLONG:
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3471 3472
  {
    longlong data= my_strntoll(&my_charset_latin1, value, length, 10,
3473 3474
                               &endptr, &err);
    *param->error= test(err);
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    longlongstore(buffer, data);
3476
    break;
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3477
  }
3478
  case MYSQL_TYPE_FLOAT:
3479
  {
3480 3481 3482 3483
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    float fdata= (float) data;
    *param->error= (fdata != data) | test(err);
    floatstore(buffer, fdata);
3484 3485
    break;
  }
3486
  case MYSQL_TYPE_DOUBLE:
3487
  {
3488 3489
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    *param->error= test(err);
3490
    doublestore(buffer, data);
3491 3492
    break;
  }
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  case MYSQL_TYPE_TIME:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
    str_to_time(value, length, tm, &err);
3497
    *param->error= test(err);
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    break;
  }
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_DATETIME:
3502
  case MYSQL_TYPE_TIMESTAMP:
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  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
3505 3506 3507
    (void) str_to_datetime(value, length, tm, 0, &err);
    *param->error= test(err) && (param->buffer_type == MYSQL_TYPE_DATE &&
                                 tm->time_type != MYSQL_TIMESTAMP_DATE);
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    break;
  }
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
3514
  default:
3515
  {
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    /*
      Copy column data to the buffer taking into account offset,
      data length and buffer length.
    */
    char *start= value + param->offset;
    char *end= value + length;
    ulong copy_length;
    if (start < end)
    {
      copy_length= end - start;
      /* We've got some data beyond offset: copy up to buffer_length bytes */
      if (param->buffer_length)
        memcpy(buffer, start, min(copy_length, param->buffer_length));
    }
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    else
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      copy_length= 0;
    if (copy_length < param->buffer_length)
      buffer[copy_length]= '\0';
3534
    *param->error= copy_length > param->buffer_length;
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    /*
      param->length will always contain length of entire column;
      number of copied bytes may be way different:
    */
3539
    *param->length= length;
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    break;
3541
  }
3542
  }
3543 3544
}

3545

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3546 3547
/*
  Convert integer value to client buffer of any type.
3548

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  SYNOPSIS
    fetch_long_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
*/
3555

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static void fetch_long_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                       longlong value)
3558
{
3559
  char *buffer= (char *)param->buffer;
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  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;
3561

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  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_TINY:
3566
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3567
                                INT_MIN8, INT_MAX8, UINT_MAX8);
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    *(uchar *)param->buffer= (uchar) value;
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    break;
  case MYSQL_TYPE_SHORT:
3571
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3572
                                INT_MIN16, INT_MAX16, UINT_MAX16);
3573
    shortstore(buffer, (short) value);
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    break;
  case MYSQL_TYPE_LONG:
3576
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3577
                                INT_MIN32, INT_MAX32, UINT_MAX32);
3578
    longstore(buffer, (int32) value);
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    break;
  case MYSQL_TYPE_LONGLONG:
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    longlongstore(buffer, value);
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    break;
  case MYSQL_TYPE_FLOAT:
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  {
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    float data;
    if (field_is_unsigned)
    {
      data= (float) ulonglong2double(value);
      *param->error= (ulonglong) data != (ulonglong) value;
    }
    else
    {
      data= (float) value;
      /*       printf("%lld, %f\n", value, data); */
      *param->error= value != ((longlong) data);
    }
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    floatstore(buffer, data);
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    break;
  }
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  case MYSQL_TYPE_DOUBLE:
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  {
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    double data;
    if (field_is_unsigned)
    {
      data= ulonglong2double(value);
      *param->error= (ulonglong) data != (ulonglong) value;
    }
    else
    {
      data= value;
      *param->error= (longlong) data != value;
    }
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    doublestore(buffer, data);
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    break;
  }
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  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATETIME:
  {
    int error;
    value= number_to_datetime(value, (MYSQL_TIME *) buffer, 1, &error);
    *param->error= test(error);
    break;
  }
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  default:
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  {
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    char buff[22];                              /* Enough for longlong */
    char *end= longlong10_to_str(value, buff, field_is_unsigned ? 10: -10);
    /* Resort to string conversion which supports all typecodes */
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    uint length= (uint) (end-buff);

    if (field->flags & ZEROFILL_FLAG && length < field->length &&
        field->length < 21)
    {
      bmove_upp((char*) buff+field->length,buff+length, length);
      bfill((char*) buff, field->length - length,'0');
      length= field->length;
    }
    fetch_string_with_conversion(param, buff, length);
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    break;
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  }
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  }
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}

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/*
  Convert double/float column to supplied buffer of any type.

  SYNOPSIS
    fetch_float_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
    width   default number of significant digits used when converting
            float/double to string
*/
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static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                        double value, int width)
3661
{
3662
  char *buffer= (char *)param->buffer;
3663

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  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_TINY:
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  {
    if (param->is_unsigned)
    {
      int8 data= (int8) value;
      *param->error= (double) data != value;
      *buffer= (uchar) data;
    }
    else
    {
      uchar data= (uchar) value;
      *param->error= (double) data != value;
      *buffer= data;
    }
3681
    break;
3682
  }
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  case MYSQL_TYPE_SHORT:
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  {
    if (param->is_unsigned)
    {
      ushort data= (ushort) value;
      *param->error= (double) data != value;
      shortstore(buffer, data);
    }
    else
    {
      short data= (short) value;
      *param->error= (double) data != value;
      shortstore(buffer, data);
    }
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    break;
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  }
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  case MYSQL_TYPE_LONG:
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  {
    if (param->is_unsigned)
    {
      uint32 data= (uint32) value;
      *param->error= (double) data != value;
      longstore(buffer, data);
    }
    else
    {
      int32 data= (int32) value;
      *param->error= (double) data != value;
      longstore(buffer, data);
    }
3713
    break;
3714
  }
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  case MYSQL_TYPE_LONGLONG:
  {
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    if (param->is_unsigned)
    {
      ulonglong data= (ulonglong) value;
      *param->error= (double) data != value;
      longlongstore(buffer, data);
    }
    else
    {
      longlong data= (longlong) value;
      *param->error= (double) data != value;
      longlongstore(buffer, data);
    }
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    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
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    float data= (float) value;
3734
    *param->error= data != value;
3735
    floatstore(buffer, data);
3736 3737 3738 3739
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
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    doublestore(buffer, value);
3741 3742
    break;
  }
3743
  default:
3744
  {
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    /*
      Resort to fetch_string_with_conversion: this should handle
      floating point -> string conversion nicely, honor all typecodes
      and param->offset possibly set in mysql_stmt_fetch_column
    */
3750
    char buff[MAX_DOUBLE_STRING_REP_LENGTH];
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    char *end;
    /* TODO: move this to a header shared between client and server. */
#define NOT_FIXED_DEC  31
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    if (field->decimals >= NOT_FIXED_DEC)
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#undef NOT_FIXED_DEC
    {
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      /*
        The 14 below is to ensure that the server and client has the same
        precisions. This will ensure that on the same machine you get the
        same value as a string independent of the protocol you use.
      */
      sprintf(buff, "%-*.*g", (int) min(sizeof(buff)-1,
                                        param->buffer_length),
	      min(14,width), value);
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      end= strcend(buff, ' ');
      *end= 0;
    }
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    else
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    {
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      sprintf(buff, "%.*f", (int) field->decimals, value);
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      end= strend(buff);
    }
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    fetch_string_with_conversion(param, buff, (uint) (end - buff));
3774 3775
    break;
  }
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  }
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}

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/*
  Fetch time/date/datetime to supplied buffer of any type

  SYNOPSIS
    param   output buffer descriptor
    time    column data
*/

static void fetch_datetime_with_conversion(MYSQL_BIND *param,
3789
                                           MYSQL_FIELD *field,
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                                           MYSQL_TIME *time)
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{
  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
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  case MYSQL_TYPE_DATE:
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    *(MYSQL_TIME *)(param->buffer)= *time;
    *param->error= time->time_type != MYSQL_TIMESTAMP_DATE;
    break;
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  case MYSQL_TYPE_TIME:
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    *(MYSQL_TIME *)(param->buffer)= *time;
    *param->error= time->time_type != MYSQL_TIMESTAMP_TIME;
    break;
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  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
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    *(MYSQL_TIME *)(param->buffer)= *time;
3806
    /* No error: time and date are compatible with datetime */
3807
    break;
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  case MYSQL_TYPE_YEAR:
    shortstore(param->buffer, time->year);
    *param->error= 1;
    break;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
  {
    ulonglong value= TIME_to_ulonglong(time);
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    fetch_float_with_conversion(param, field,
                                ulonglong2double(value), DBL_DIG);
    break;
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  }
  case MYSQL_TYPE_TINY:
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong) TIME_to_ulonglong(time);
3827 3828
    fetch_long_with_conversion(param, field, value);
    break;
3829
  }
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  default:
  {
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    /*
      Convert time value  to string and delegate the rest to
      fetch_string_with_conversion:
    */
3836 3837
    char buff[MAX_DATE_STRING_REP_LENGTH];
    uint length= my_TIME_to_str(time, buff);
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    /* Resort to string conversion */
    fetch_string_with_conversion(param, (char *)buff, length);
    break;
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  }
  }
}
3844

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/*
  Fetch and convert result set column to output buffer.

  SYNOPSIS
    fetch_result_with_conversion()
    param   output buffer descriptor
    field   column metadata
    row     points to a column of result set tuple in binary format

  DESCRIPTION
    This is a fallback implementation of column fetch used
    if column and output buffer types do not match.
    Increases tuple pointer to point at the next column within the
    tuple.
*/
3861

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static void fetch_result_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                         uchar **row)
3864
{
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  enum enum_field_types field_type= field->type;
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  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;
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3868 3869 3870
  switch (field_type) {
  case MYSQL_TYPE_TINY:
  {
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    uchar value= **row;
    /* sic: we need to cast to 'signed char' as 'char' may be unsigned */
    longlong data= field_is_unsigned ? (longlong) value :
                                       (longlong) (signed char) value;
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    fetch_long_with_conversion(param, field, data);
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    *row+= 1;
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    break;
  }
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
  {
3882
    short value= sint2korr(*row);
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    longlong data= field_is_unsigned ? (longlong) (unsigned short) value :
                                       (longlong) value;
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    fetch_long_with_conversion(param, field, data);
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    *row+= 2;
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    break;
  }
3889
  case MYSQL_TYPE_INT24: /* mediumint is sent as 4 bytes int */
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  case MYSQL_TYPE_LONG:
  {
3892
    long value= sint4korr(*row);
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    longlong data= field_is_unsigned ? (longlong) (unsigned long) value :
                                       (longlong) value;
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    fetch_long_with_conversion(param, field, data);
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    *row+= 4;
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    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong)sint8korr(*row);
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    fetch_long_with_conversion(param, field, value);
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    *row+= 8;
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    break;
  }
  case MYSQL_TYPE_FLOAT:
  {
    float value;
    float4get(value,*row);
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    fetch_float_with_conversion(param, field, value, FLT_DIG);
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    *row+= 4;
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    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
    double value;
    float8get(value,*row);
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    fetch_float_with_conversion(param, field, value, DBL_DIG);
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    *row+= 8;
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    break;
  }
  case MYSQL_TYPE_DATE:
  {
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    MYSQL_TIME tm;
3925

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    read_binary_date(&tm, row);
3927
    fetch_datetime_with_conversion(param, field, &tm);
3928 3929 3930 3931
    break;
  }
  case MYSQL_TYPE_TIME:
  {
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    MYSQL_TIME tm;
3933

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    read_binary_time(&tm, row);
3935
    fetch_datetime_with_conversion(param, field, &tm);
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    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME tm;
3942

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    read_binary_datetime(&tm, row);
3944
    fetch_datetime_with_conversion(param, field, &tm);
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    break;
  }
3947
  default:
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  {
    ulong length= net_field_length(row);
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    fetch_string_with_conversion(param, (char*) *row, length);
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    *row+= length;
3952 3953
    break;
  }
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  }
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}

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/*
  Functions to fetch data to application buffers without conversion.

  All functions have the following characteristics:

  SYNOPSIS
    fetch_result_xxx()
    param   MySQL bind param
    pos     Row value

  DESCRIPTION
    These are no-conversion functions, used in binary protocol to store
    rows in application buffers. A function used only if type of binary data
    is compatible with type of application buffer.

  RETURN
    none
*/

3977 3978
static void fetch_result_tinyint(MYSQL_BIND *param, MYSQL_FIELD *field,
                                 uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  uchar data= **row;
  *(uchar *)param->buffer= data;
3983
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX8;
3984
  (*row)++;
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}

3987 3988
static void fetch_result_short(MYSQL_BIND *param, MYSQL_FIELD *field,
                               uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ushort data= (ushort) sint2korr(*row);
  shortstore(param->buffer, data);
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  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX16;
3994
  *row+= 2;
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}

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static void fetch_result_int32(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
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{
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  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  uint32 data= (uint32) sint4korr(*row);
  longstore(param->buffer, data);
4004
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX32;
4005
  *row+= 4;
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}

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static void fetch_result_int64(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
4011
{
4012 4013
  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ulonglong data= (ulonglong) sint8korr(*row);
4014
  *param->error= param->is_unsigned != field_is_unsigned && data > LONGLONG_MAX;
4015
  longlongstore(param->buffer, data);
4016
  *row+= 8;
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}

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static void fetch_result_float(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
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{
  float value;
  float4get(value,*row);
4025
  floatstore(param->buffer, value);
4026
  *row+= 4;
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}

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static void fetch_result_double(MYSQL_BIND *param,
                                MYSQL_FIELD *field __attribute__((unused)),
                                uchar **row)
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{
  double value;
  float8get(value,*row);
4035
  doublestore(param->buffer, value);
4036
  *row+= 8;
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}

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static void fetch_result_time(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
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{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_time(tm, row);
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}

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static void fetch_result_date(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
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{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_date(tm, row);
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}

4055 4056 4057
static void fetch_result_datetime(MYSQL_BIND *param,
                                  MYSQL_FIELD *field __attribute__((unused)),
                                  uchar **row)
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{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_datetime(tm, row);
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}

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static void fetch_result_bin(MYSQL_BIND *param,
                             MYSQL_FIELD *field __attribute__((unused)),
                             uchar **row)
4066
{
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  ulong length= net_field_length(row);
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
4070
  *param->length= length;
4071
  *param->error= copy_length < length;
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  *row+= length;
}
4074

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static void fetch_result_str(MYSQL_BIND *param,
                             MYSQL_FIELD *field __attribute__((unused)),
                             uchar **row)
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{
  ulong length= net_field_length(row);
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  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
4082 4083
  /* Add an end null if there is room in the buffer */
  if (copy_length != param->buffer_length)
4084
    ((uchar *)param->buffer)[copy_length]= '\0';
4085
  *param->length= length;			/* return total length */
4086
  *param->error= copy_length < length;
4087
  *row+= length;
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}

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/*
  functions to calculate max lengths for strings during
  mysql_stmt_store_result()
*/

static void skip_result_fixed(MYSQL_BIND *param,
			      MYSQL_FIELD *field __attribute__((unused)),
			      uchar **row)

{
  (*row)+= param->pack_length;
}


static void skip_result_with_length(MYSQL_BIND *param __attribute__((unused)),
				    MYSQL_FIELD *field __attribute__((unused)),
				    uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
}


static void skip_result_string(MYSQL_BIND *param __attribute__((unused)),
			       MYSQL_FIELD *field,
			       uchar **row)

{
  ulong length= net_field_length(row);
  (*row)+= length;
  if (field->max_length < length)
    field->max_length= length;
}


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/*
  Check that two field types are binary compatible i. e.
  have equal representation in the binary protocol and
  require client-side buffers of the same type.

  SYNOPSIS
    is_binary_compatible()
    type1   parameter type supplied by user
    type2   field type, obtained from result set metadata

  RETURN
    TRUE or FALSE
*/

static my_bool is_binary_compatible(enum enum_field_types type1,
                                    enum enum_field_types type2)
{
  static const enum enum_field_types
4145 4146 4147
    range1[]= { MYSQL_TYPE_SHORT, MYSQL_TYPE_YEAR, MYSQL_TYPE_NULL },
    range2[]= { MYSQL_TYPE_INT24, MYSQL_TYPE_LONG, MYSQL_TYPE_NULL },
    range3[]= { MYSQL_TYPE_DATETIME, MYSQL_TYPE_TIMESTAMP, MYSQL_TYPE_NULL },
4148 4149 4150
    range4[]= { MYSQL_TYPE_ENUM, MYSQL_TYPE_SET, MYSQL_TYPE_TINY_BLOB,
                MYSQL_TYPE_MEDIUM_BLOB, MYSQL_TYPE_LONG_BLOB, MYSQL_TYPE_BLOB,
                MYSQL_TYPE_VAR_STRING, MYSQL_TYPE_STRING, MYSQL_TYPE_GEOMETRY,
4151
                MYSQL_TYPE_DECIMAL, MYSQL_TYPE_NULL },
4152 4153
   *range_list[]= { range1, range2, range3, range4 },
   **range_list_end= range_list + sizeof(range_list)/sizeof(*range_list);
4154
   const enum enum_field_types **range, *type;
4155 4156 4157 4158 4159 4160 4161

  if (type1 == type2)
    return TRUE;
  for (range= range_list; range != range_list_end; ++range)
  {
    /* check that both type1 and type2 are in the same range */
    bool type1_found= FALSE, type2_found= FALSE;
4162
    for (type= *range; *type != MYSQL_TYPE_NULL; type++)
4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334
    {
      type1_found|= type1 == *type;
      type2_found|= type2 == *type;
    }
    if (type1_found || type2_found)
      return type1_found && type2_found;
  }
  return FALSE;
}


/*
  Setup a fetch function for one column of a result set.

  SYNOPSIS
    setup_one_fetch_function()
    param    output buffer descriptor
    field    column descriptor

  DESCRIPTION
    When user binds result set buffers or when result set
    metadata is changed, we need to setup fetch (and possibly
    conversion) functions for all columns of the result set.
    In addition to that here we set up skip_result function, used
    to update result set metadata in case when
    STMT_ATTR_UPDATE_MAX_LENGTH attribute is set.
    Notice that while fetch_result is chosen depending on both
    field->type and param->type, skip_result depends on field->type
    only.

  RETURN
    TRUE   fetch function for this typecode was not found (typecode
          is not supported by the client library)
    FALSE  success
*/

static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
{
  /* Setup data copy functions for the different supported types */
  switch (param->buffer_type) {
  case MYSQL_TYPE_NULL: /* for dummy binds */
    /*
      It's not binary compatible with anything the server can return:
      no need to setup fetch_result, as it'll be reset anyway
    */
    *param->length= 0;
    break;
  case MYSQL_TYPE_TINY:
    param->fetch_result= fetch_result_tinyint;
    *param->length= 1;
    break;
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
    param->fetch_result= fetch_result_short;
    *param->length= 2;
    break;
  case MYSQL_TYPE_INT24:
  case MYSQL_TYPE_LONG:
    param->fetch_result= fetch_result_int32;
    *param->length= 4;
    break;
  case MYSQL_TYPE_LONGLONG:
    param->fetch_result= fetch_result_int64;
    *param->length= 8;
    break;
  case MYSQL_TYPE_FLOAT:
    param->fetch_result= fetch_result_float;
    *param->length= 4;
    break;
  case MYSQL_TYPE_DOUBLE:
    param->fetch_result= fetch_result_double;
    *param->length= 8;
    break;
  case MYSQL_TYPE_TIME:
    param->fetch_result= fetch_result_time;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_DATE:
    param->fetch_result= fetch_result_date;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
    param->fetch_result= fetch_result_datetime;
    *param->length= sizeof(MYSQL_TIME);
    break;
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_bin;
    break;
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_str;
    break;
  default:
    return TRUE;
  }
  if (! is_binary_compatible(param->buffer_type, field->type))
    param->fetch_result= fetch_result_with_conversion;

  /* Setup skip_result functions (to calculate max_length) */
  param->skip_result= skip_result_fixed;
  switch (field->type) {
  case MYSQL_TYPE_NULL: /* for dummy binds */
    param->pack_length= 0;
    field->max_length= 0;
    break;
  case MYSQL_TYPE_TINY:
    param->pack_length= 1;
    field->max_length= 4;                     /* as in '-127' */
    break;
  case MYSQL_TYPE_YEAR:
  case MYSQL_TYPE_SHORT:
    param->pack_length= 2;
    field->max_length= 6;                     /* as in '-32767' */
    break;
  case MYSQL_TYPE_INT24:
    field->max_length= 9;  /* as in '16777216' or in '-8388607' */
    param->pack_length= 4;
    break;
  case MYSQL_TYPE_LONG:
    field->max_length= 11;                    /* '-2147483647' */
    param->pack_length= 4;
    break;
  case MYSQL_TYPE_LONGLONG:
    field->max_length= 21;                    /* '18446744073709551616' */
    param->pack_length= 8;
    break;
  case MYSQL_TYPE_FLOAT:
    param->pack_length= 4;
    field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_DOUBLE:
    param->pack_length= 8;
    field->max_length= MAX_DOUBLE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_TIME:
    field->max_length= 15;                    /* 19:23:48.123456 */
    param->skip_result= skip_result_with_length;
  case MYSQL_TYPE_DATE:
    field->max_length= 10;                    /* 2003-11-11 */
    param->skip_result= skip_result_with_length;
    break;
    break;
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
    param->skip_result= skip_result_with_length;
    field->max_length= MAX_DATE_STRING_REP_LENGTH;
    break;
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_GEOMETRY:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
    param->skip_result= skip_result_string;
    break;
  default:
    return TRUE;
  }
  return FALSE;
}


4335
/*
4336
  Setup the bind buffers for resultset processing
4337 4338
*/

4339
my_bool STDCALL mysql_stmt_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *bind)
4340
{
4341
  MYSQL_BIND *param, *end;
4342
  MYSQL_FIELD *field;
4343
  ulong       bind_count= stmt->field_count;
4344
  uint        param_count= 0;
4345
  DBUG_ENTER("mysql_stmt_bind_result");
4346
  DBUG_PRINT("enter",("field_count: %d", bind_count));
4347

4348
  if (!bind_count)
4349 4350 4351 4352 4353
  {
    if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    {
      set_stmt_error(stmt, CR_NO_PREPARE_STMT, unknown_sqlstate);
    }
4354
    DBUG_RETURN(0);
4355 4356 4357 4358 4359 4360
  }

  /*
    We only need to check that stmt->field_count - if it is not null
    stmt->bind was initialized in mysql_stmt_prepare
   */
4361

4362
  memcpy((char*) stmt->bind, (char*) bind, sizeof(MYSQL_BIND) * bind_count);
4363

4364 4365 4366
  for (param= stmt->bind, end= param + bind_count, field= stmt->fields ;
       param < end ;
       param++, field++)
4367
  {
4368 4369
    DBUG_PRINT("info",("buffer_type: %u  field_type: %u",
                       (uint) param->buffer_type, (uint) field->type));
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4370 4371
    /*
      Set param->is_null to point to a dummy variable if it's not set.
4372
      This is to make the execute code easier
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4373 4374
    */
    if (!param->is_null)
4375
      param->is_null= &param->is_null_value;
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4376

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4377
    if (!param->length)
4378 4379 4380 4381
      param->length= &param->length_value;

    if (!param->error)
      param->error= &param->error_value;
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4382

4383
    param->param_number= param_count++;
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4384 4385
    param->offset= 0;

4386 4387
    if (setup_one_fetch_function(param, field))
    {
4388 4389
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
4390 4391
              ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
              field->type, param_count);
4392 4393
      DBUG_RETURN(1);
    }
4394
  }
4395 4396 4397 4398
  stmt->bind_result_done= BIND_RESULT_DONE;
  if (stmt->mysql->options.report_data_truncation)
    stmt->bind_result_done|= REPORT_DATA_TRUNCATION;

4399 4400 4401
  DBUG_RETURN(0);
}

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4402

4403
/*
4404
  Fetch row data to bind buffers
4405 4406
*/

4407
static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
4408
{
4409
  MYSQL_BIND  *bind, *end;
4410
  MYSQL_FIELD *field;
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4411
  uchar *null_ptr, bit;
4412
  int truncation_count= 0;
4413 4414 4415 4416 4417 4418
  /*
    Precondition: if stmt->field_count is zero or row is NULL, read_row_*
    function must return no data.
  */
  DBUG_ASSERT(stmt->field_count);
  DBUG_ASSERT(row);
4419

4420 4421 4422
  if (!stmt->bind_result_done)
  {
    /* If output parameters were not bound we should just return success */
4423
    return 0;
4424
  }
4425 4426

  null_ptr= row;
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4427 4428
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */
4429

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4430
  /* Copy complete row to application buffers */
4431 4432
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
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4433
       bind++, field++)
4434
  {
4435
    *bind->error= 0;
4436
    if (*null_ptr & bit)
4437 4438
    {
      /*
4439
        We should set both row_ptr and is_null to be able to see
4440 4441 4442 4443 4444
        nulls in mysql_stmt_fetch_column. This is because is_null may point
        to user data which can be overwritten between mysql_stmt_fetch and
        mysql_stmt_fetch_column, and in this case nullness of column will be
        lost. See mysql_stmt_fetch_column for details.
      */
4445
      bind->row_ptr= NULL;
4446 4447
      *bind->is_null= 1;
    }
4448
    else
4449
    {
4450
      *bind->is_null= 0;
4451 4452 4453
      bind->row_ptr= row;
      (*bind->fetch_result)(bind, field, &row);
      truncation_count+= *bind->error;
4454
    }
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4455
    if (!((bit<<=1) & 255))
4456
    {
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4457
      bit= 1;					/* To next byte */
4458
      null_ptr++;
4459 4460
    }
  }
4461 4462
  if (truncation_count && (stmt->bind_result_done & REPORT_DATA_TRUNCATION))
    return MYSQL_DATA_TRUNCATED;
4463 4464 4465
  return 0;
}

4466

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4467
int cli_unbuffered_fetch(MYSQL *mysql, char **row)
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SCRUM  
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4468 4469 4470 4471
{
  if (packet_error == net_safe_read(mysql))
    return 1;

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4472 4473
  *row= ((mysql->net.read_pos[0] == 254) ? NULL :
	 (char*) (mysql->net.read_pos+1));
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4474 4475
  return 0;
}
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4476

4477

4478
/*
4479
  Fetch and return row data to bound buffers, if any
4480 4481
*/

4482
int STDCALL mysql_stmt_fetch(MYSQL_STMT *stmt)
4483
{
4484
  int rc;
4485
  uchar *row;
4486
  DBUG_ENTER("mysql_stmt_fetch");
4487

4488
  if ((rc= (*stmt->read_row_func)(stmt, &row)) ||
4489
      ((rc= stmt_fetch_row(stmt, row)) && rc != MYSQL_DATA_TRUNCATED))
4490
  {
4491 4492
    stmt->state= MYSQL_STMT_PREPARE_DONE;       /* XXX: this is buggy */
    stmt->read_row_func= stmt_read_row_no_data;
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4493
  }
4494
  else
4495
  {
4496 4497
    /* This is to know in mysql_stmt_fetch_column that data was fetched */
    stmt->state= MYSQL_STMT_FETCH_DONE;
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4498
  }
4499
  DBUG_RETURN(rc);
4500 4501
}

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4502

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4503
/*
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4504
  Fetch data for one specified column data
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4505 4506

  SYNOPSIS
4507
    mysql_stmt_fetch_column()
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4508
    stmt		Prepared statement handler
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4509
    bind		Where data should be placed. Should be filled in as
4510
			when calling mysql_stmt_bind_result()
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4511 4512 4513
    column		Column to fetch (first column is 0)
    ulong offset	Offset in result data (to fetch blob in pieces)
			This is normally 0
4514
  RETURN
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4515 4516
    0	ok
    1	error
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4517 4518
*/

4519
int STDCALL mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *bind,
4520
                                    uint column, ulong offset)
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4521
{
4522
  MYSQL_BIND *param= stmt->bind+column;
4523
  DBUG_ENTER("mysql_stmt_fetch_column");
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4524

4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535
  if ((int) stmt->state < (int) MYSQL_STMT_FETCH_DONE)
  {
    set_stmt_error(stmt, CR_NO_DATA, unknown_sqlstate);
    return 1;
  }
  if (column >= stmt->field_count)
  {
    set_stmt_error(stmt, CR_INVALID_PARAMETER_NO, unknown_sqlstate);
    DBUG_RETURN(1);
  }

4536 4537 4538 4539
  if (!bind->error)
    bind->error= &bind->error_value;
  *bind->error= 0;
  if (param->row_ptr)
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4540
  {
4541
    MYSQL_FIELD *field= stmt->fields+column;
4542
    uchar *row= param->row_ptr;
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4543 4544 4545 4546
    bind->offset= offset;
    if (bind->is_null)
      *bind->is_null= 0;
    if (bind->length) /* Set the length if non char/binary types */
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4547
      *bind->length= *param->length;
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4548
    else
4549
      bind->length= &param->length_value;       /* Needed for fetch_result() */
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4550
    fetch_result_with_conversion(bind, field, &row);
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4551
  }
4552 4553 4554 4555 4556
  else
  {
    if (bind->is_null)
      *bind->is_null= 1;
  }
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4557 4558 4559 4560
  DBUG_RETURN(0);
}


4561
/*
4562 4563 4564
  Read all rows of data from server  (binary format)
*/

4565
int cli_read_binary_rows(MYSQL_STMT *stmt)
4566 4567 4568 4569
{
  ulong      pkt_len;
  uchar      *cp;
  MYSQL      *mysql= stmt->mysql;
4570 4571
  MYSQL_DATA *result= &stmt->result;
  MYSQL_ROWS *cur, **prev_ptr= &result->data;
4572
  NET        *net = &mysql->net;
4573
  DBUG_ENTER("cli_read_binary_rows");
4574

4575
  mysql= mysql->last_used_con;
4576

4577
  while ((pkt_len= net_safe_read(mysql)) != packet_error)
4578
  {
4579 4580
    cp= net->read_pos;
    if (cp[0] != 254 || pkt_len >= 8)
4581
    {
4582 4583 4584 4585
      if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
                                          sizeof(MYSQL_ROWS) + pkt_len - 1)))
      {
        set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
4586
        goto err;
4587 4588 4589 4590 4591
      }
      cur->data= (MYSQL_ROW) (cur+1);
      *prev_ptr= cur;
      prev_ptr= &cur->next;
      memcpy((char *) cur->data, (char *) cp+1, pkt_len-1);
4592 4593
      cur->length= pkt_len;		/* To allow us to do sanity checks */
      result->rows++;
4594
    }
4595
    else
4596
    {
4597 4598 4599 4600
      /* end of data */
      *prev_ptr= 0;
      mysql->warning_count= uint2korr(cp+1);
      mysql->server_status= uint2korr(cp+3);
4601 4602
      DBUG_PRINT("info",("status: %u  warning_count: %u",
                         mysql->server_status, mysql->warning_count));
4603 4604 4605
      DBUG_RETURN(0);
    }
  }
4606
  set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
4607 4608

err:
4609
  DBUG_RETURN(1);
4610 4611
}

4612

4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655
/*
  Update meta data for statement

  SYNOPSIS
    stmt_update_metadata()
    stmt			Statement handler
    row				Binary data

  NOTES
    Only updates MYSQL_FIELD->max_length for strings
*/

static void stmt_update_metadata(MYSQL_STMT *stmt, MYSQL_ROWS *data)
{
  MYSQL_BIND  *bind, *end;
  MYSQL_FIELD *field;
  uchar *null_ptr, bit;
  uchar *row= (uchar*) data->data;
#ifndef DBUG_OFF
  uchar *row_end= row + data->length;
#endif

  null_ptr= row;
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */

  /* Go throw all fields and calculate metadata */
  for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields ;
       bind < end ;
       bind++, field++)
  {
    if (!(*null_ptr & bit))
      (*bind->skip_result)(bind, field, &row);
    DBUG_ASSERT(row <= row_end);
    if (!((bit<<=1) & 255))
    {
      bit= 1;					/* To next byte */
      null_ptr++;
    }
  }
}


4656 4657 4658 4659 4660 4661 4662
/*
  Store or buffer the binary results to stmt
*/

int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
4663
  MYSQL_DATA *result= &stmt->result;
4664
  DBUG_ENTER("mysql_stmt_store_result");
4665 4666 4667 4668 4669

  mysql= mysql->last_used_con;

  if (!stmt->field_count)
    DBUG_RETURN(0);
4670 4671
  if ((int) stmt->state < (int) MYSQL_STMT_EXECUTE_DONE ||
      mysql->status != MYSQL_STATUS_GET_RESULT)
4672
  {
4673
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
4674
    DBUG_RETURN(1);
4675
  }
4676
  if (result->data)
4677
  {
4678 4679 4680 4681
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
    stmt->data_cursor= NULL;
4682
  }
4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697

  if (stmt->update_max_length && !stmt->bind_result_done)
  {
    /*
      We must initalize the bind structure to be able to calculate
      max_length
    */
    MYSQL_BIND  *bind, *end;
    MYSQL_FIELD *field;
    bzero((char*) stmt->bind, sizeof(*stmt->bind)* stmt->field_count);

    for (bind= stmt->bind, end= bind + stmt->field_count, field= stmt->fields;
	 bind < end ;
	 bind++, field++)
    {
4698
      bind->buffer_type= MYSQL_TYPE_NULL;
4699 4700 4701
      bind->buffer_length=1;
    }

4702 4703
    if (mysql_stmt_bind_result(stmt, stmt->bind))
      DBUG_RETURN(1);
4704 4705 4706
    stmt->bind_result_done= 0;			/* No normal bind done */
  }

4707
  if ((*mysql->methods->read_binary_rows)(stmt))
4708
  {
4709 4710 4711
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
4712
    mysql->status= MYSQL_STATUS_READY;
4713
    DBUG_RETURN(1);
4714
  }
4715

4716 4717 4718 4719 4720 4721 4722
  if (stmt->update_max_length)
  {
    MYSQL_ROWS *cur= result->data;
    for(; cur; cur=cur->next)
      stmt_update_metadata(stmt, cur);
  }

4723 4724
  stmt->data_cursor= result->data;
  mysql->affected_rows= stmt->affected_rows= result->rows;
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  stmt->read_row_func= stmt_read_row_buffered;
  mysql->unbuffered_fetch_owner= 0;             /* set in stmt_execute */
  mysql->status= MYSQL_STATUS_READY;		/* server is ready */
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  DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_stmt_fetch() */
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}

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/*
  Seek to desired row in the statement result set
*/

MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_seek(MYSQL_STMT *stmt, MYSQL_ROW_OFFSET row)
{
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  MYSQL_ROW_OFFSET offset= stmt->data_cursor;
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  DBUG_ENTER("mysql_stmt_row_seek");
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  stmt->data_cursor= row;
  DBUG_RETURN(offset);
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}

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/*
  Return the current statement row cursor position
*/

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MYSQL_ROW_OFFSET STDCALL
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mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_row_tell");
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  DBUG_RETURN(stmt->data_cursor);
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}

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/*
  Move the stmt result set data cursor to specified row
*/

void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
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  MYSQL_ROWS *tmp= stmt->result.data;
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  DBUG_ENTER("mysql_stmt_data_seek");
  DBUG_PRINT("enter",("row id to seek: %ld",(long) row));
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  for (; tmp && row; --row, tmp= tmp->next)
    ;
  stmt->data_cursor= tmp;
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  DBUG_VOID_RETURN;
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}

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/*
  Return total rows the current statement result set
*/

my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_num_rows");
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  DBUG_RETURN(stmt->result.rows);
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}
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my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{
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  MYSQL_DATA *result= &stmt->result;
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  DBUG_ENTER("mysql_stmt_free_result");

  DBUG_ASSERT(stmt != 0);
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  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    MYSQL *mysql= stmt->mysql;

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    if (result->data)
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    {
      /* Result buffered */
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      free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
      result->data= NULL;
      result->rows= 0;
      stmt->data_cursor= NULL;
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    }
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    if (mysql && stmt->field_count &&
        (int) stmt->state > (int) MYSQL_STMT_PREPARE_DONE)
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    {
      if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
        mysql->unbuffered_fetch_owner= 0;
      if (mysql->status != MYSQL_STATUS_READY)
      {
        /* There is a result set and it belongs to this statement */
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        (*mysql->methods->flush_use_result)(mysql);
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        mysql->status= MYSQL_STATUS_READY;
      }
    }
    stmt->state= MYSQL_STMT_PREPARE_DONE;
    stmt->read_row_func= stmt_read_row_no_data;
  }
  DBUG_RETURN(0);
}

4827
/********************************************************************
4828
 statement error handling and close
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*********************************************************************/
4830

4831
/*
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  Close the statement handle by freeing all alloced resources
4833

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  SYNOPSIS
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    mysql_stmt_close()
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    stmt	       Statement handle
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  RETURN VALUES
    0	ok
    1	error
*/
4842

4843
my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
4844
{
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  MYSQL *mysql= stmt->mysql;
  int rc= 0;
  DBUG_ENTER("mysql_stmt_close");
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  free_root(&stmt->result.alloc, MYF(0));
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  free_root(&stmt->mem_root, MYF(0));

  if (mysql)
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  {
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    mysql->stmts= list_delete(mysql->stmts, &stmt->list);
    if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
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    {
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      char buff[MYSQL_STMT_HEADER];             /* 4 bytes - stmt id */
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      if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
        mysql->unbuffered_fetch_owner= 0;
      if (mysql->status != MYSQL_STATUS_READY)
      {
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        /*
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          Flush result set of the connection. If it does not belong
          to this statement, set a warning.
        */
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        (*mysql->methods->flush_use_result)(mysql);
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        if (mysql->unbuffered_fetch_owner)
          *mysql->unbuffered_fetch_owner= TRUE;
        mysql->status= MYSQL_STATUS_READY;
      }
      int4store(buff, stmt->stmt_id);
      if ((rc= simple_command(mysql, COM_CLOSE_STMT, buff, 4, 1)))
      {
        set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                        mysql->net.sqlstate);
      }
4878
    }
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  }
4880

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  my_free((gptr) stmt, MYF(MY_WME));
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4883
  DBUG_RETURN(test(rc));
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}

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/*
  Reset the statement buffers in server
*/

my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
{
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  char buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
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  MYSQL *mysql;
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  MYSQL_BIND *param, *param_end;
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  DBUG_ENTER("mysql_stmt_reset");
  DBUG_ASSERT(stmt != 0);
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  /* If statement hasnt been prepared there is nothing to reset */
  if ((int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE)
    DBUG_RETURN(0);
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  mysql= stmt->mysql->last_used_con;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
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  if ((*mysql->methods->advanced_command)(mysql, COM_RESET_STMT, buff,
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                                          sizeof(buff), 0, 0, 0))
4906
  {
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    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
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                    mysql->net.sqlstate);
    DBUG_RETURN(1);
  }
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  /* Clear long_data_used for next call (as we do in mysql_stmt_execute() */
  for (param= stmt->params, param_end= param + stmt->param_count;
       param < param_end;
       param++)
    param->long_data_used= 0;

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  DBUG_RETURN(0);
}

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/*
  Return statement error code
*/

uint STDCALL mysql_stmt_errno(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_errno");
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  DBUG_RETURN(stmt->last_errno);
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}

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const char *STDCALL mysql_stmt_sqlstate(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_sqlstate");
  DBUG_RETURN(stmt->sqlstate);
}

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/*
  Return statement error message
*/

const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt)
{
  DBUG_ENTER("mysql_stmt_error");
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  DBUG_RETURN(stmt->last_error);
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}

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/********************************************************************
 Transactional APIs
*********************************************************************/

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/*
  Commit the current transaction
*/

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my_bool STDCALL mysql_commit(MYSQL * mysql)
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{
  DBUG_ENTER("mysql_commit");
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  DBUG_RETURN((my_bool) mysql_real_query(mysql, "commit", 6));
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}

/*
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  Rollback the current transaction
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*/

4966
my_bool STDCALL mysql_rollback(MYSQL * mysql)
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{
  DBUG_ENTER("mysql_rollback");
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  DBUG_RETURN((my_bool) mysql_real_query(mysql, "rollback", 8));
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}


/*
  Set autocommit to either true or false
*/

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my_bool STDCALL mysql_autocommit(MYSQL * mysql, my_bool auto_mode)
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{
  DBUG_ENTER("mysql_autocommit");
  DBUG_PRINT("enter", ("mode : %d", auto_mode));

  if (auto_mode) /* set to true */
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    DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=1", 16));
  DBUG_RETURN((my_bool) mysql_real_query(mysql, "set autocommit=0", 16));
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}
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/********************************************************************
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 Multi query execution + SPs APIs
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*********************************************************************/

/*
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  Returns true/false to indicate whether any more query results exist
  to be read using mysql_next_result()
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*/

my_bool STDCALL mysql_more_results(MYSQL *mysql)
{
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  my_bool res;
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  DBUG_ENTER("mysql_more_results");
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  res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ?
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	1: 0);
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  DBUG_PRINT("exit",("More results exists ? %d", res));
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  DBUG_RETURN(res);
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}

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/*
  Reads and returns the next query results
*/
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int STDCALL mysql_next_result(MYSQL *mysql)
5013
{
5014
  DBUG_ENTER("mysql_next_result");
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  if (mysql->status != MYSQL_STATUS_READY)
  {
    strmov(mysql->net.sqlstate, unknown_sqlstate);
    strmov(mysql->net.last_error,
	   ER(mysql->net.last_errno=CR_COMMANDS_OUT_OF_SYNC));
    DBUG_RETURN(1);
  }

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  mysql->net.last_error[0]= 0;
  mysql->net.last_errno= 0;
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  strmov(mysql->net.sqlstate, not_error_sqlstate);
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  mysql->affected_rows= ~(my_ulonglong) 0;

  if (mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS)
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    DBUG_RETURN((*mysql->methods->next_result)(mysql));

5032
  DBUG_RETURN(-1);				/* No more results */
5033
}
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5034

5035

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MYSQL_RES * STDCALL mysql_use_result(MYSQL *mysql)
{
  return (*mysql->methods->use_result)(mysql);
}

my_bool STDCALL mysql_read_query_result(MYSQL *mysql)
{
  return (*mysql->methods->read_query_result)(mysql);
}