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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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#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 my_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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    if (argc > -1)
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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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/*
  Free all memory and resources used by the client library

  NOTES
    When calling this there should not be any other threads using
    the library.

    To make things simpler when used with windows dll's (which calls this
    function automaticly), it's safe to call this function multiple times.
*/


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void STDCALL mysql_server_end()
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{
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  if (!mysql_client_init)
    return;

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#ifdef EMBEDDED_LIBRARY
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  end_embedded_server();
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#endif
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  finish_client_errs();
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  vio_end();

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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(MY_DONT_FREE_DBUG);
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    /* Remove TRACING, if enabled by mysql_debug() */
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    DBUG_POP();
  }
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  else
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  {
    free_charsets();
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    mysql_thread_end();
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  }

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  mysql_client_init= org_my_init_done= 0;
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#ifdef EMBEDDED_SERVER
  if (stderror_file)
  {
    fclose(stderror_file);
    stderror_file= 0;
  }
#endif
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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 (debug)
  {
    DBUG_PUSH(debug);
  }
  else if ((env = getenv("MYSQL_DEBUG")))
  {
    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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my_pipe_sig_handler(int sig __attribute__((unused)))
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{
  DBUG_PRINT("info",("Hit by signal %d",sig));
#ifdef DONT_REMEMBER_SIGNAL
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  (void) signal(SIGPIPE, my_pipe_sig_handler);
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#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)
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	my_free((uchar*) mysql,MYF(0));
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    }
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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;

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  pkt_length= cli_safe_read(mysql);
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  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 */
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    if (cli_safe_read(mysql) == packet_error)
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      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.
  */
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  mysql_detach_stmt_list(&mysql->stmts, "mysql_change_user");
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  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);
}

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#elif !defined(MSDOS) && ! defined(VMS) && !defined(__WIN__)
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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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  {
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    VOID(my_net_write(net,"",0));               /* Server needs one packet */
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    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;
  }

842
  /* 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;
    }
  }
857

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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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  my_free(buf, MYF(0));
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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, (uchar *) buf, buf_len, MYF(0))) < 0)
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  {
    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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/**************************************************************************
  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))
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    DBUG_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)
{
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  int res;
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  DBUG_ENTER("mysql_ping");
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  res= simple_command(mysql,COM_PING,0,0,0);
  if (res == CR_SERVER_LOST && mysql->reconnect)
    res= simple_command(mysql,COM_PING,0,0,0);
  DBUG_RETURN(res);
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}


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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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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)
{
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  return mysql->charset->csname;
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}

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void STDCALL mysql_get_character_set_info(MYSQL *mysql, MY_CHARSET_INFO *csinfo)
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{
  csinfo->number   = mysql->charset->number;
  csinfo->state    = mysql->charset->state;
  csinfo->csname   = mysql->charset->csname;
  csinfo->name     = mysql->charset->name;
  csinfo->comment  = mysql->charset->comment;
  csinfo->mbminlen = mysql->charset->mbminlen;
  csinfo->mbmaxlen = mysql->charset->mbmaxlen;

  if (mysql->options.charset_dir)
    csinfo->dir = mysql->options.charset_dir;
  else
    csinfo->dir = charsets_dir;
}
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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;
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  my_net_set_read_timeout(net, CLIENT_NET_READ_TIMEOUT);
  my_net_set_write_timeout(net, CLIENT_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, 0, from, length);
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}

ulong STDCALL
mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
			 ulong length)
{
1595 1596
  if (mysql->server_status & SERVER_STATUS_NO_BACKSLASH_ESCAPES)
    return escape_quotes_for_mysql(mysql->charset, to, 0, from, length);
1597
  return escape_string_for_mysql(mysql->charset, to, 0, 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;
}
1702 1703

/********************************************************************
1704
 Implementation of new client API for 4.1 version.
1705

1706
 mysql_stmt_* are real prototypes used by applications.
1707

1708 1709 1710 1711 1712
 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.
1713 1714
*********************************************************************/

1715
/******************* Declarations ***********************************/
1716

1717
/* Default number of rows fetched per one COM_STMT_FETCH command. */
1718

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1719
#define DEFAULT_PREFETCH_ROWS (ulong) 1
1720

1721
/*
1722 1723 1724 1725 1726
  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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*/

1729 1730
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);
1732
static int stmt_read_row_no_data(MYSQL_STMT *stmt, unsigned char **row);
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static int stmt_read_row_no_result_set(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 my_bool setup_one_fetch_function(MYSQL_BIND *, MYSQL_FIELD *field);
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/* Auxilary function used to reset statement handle. */

#define RESET_SERVER_SIDE 1
#define RESET_LONG_DATA 2
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#define RESET_STORE_RESULT 4
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static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags);

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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)
*/
1762
#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)
*/
1768
#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

1786
/**************** Misc utility functions ****************************/
1787 1788

/*
1789
  Reallocate the NET package to have at least length bytes available.
1790

1791
  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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*/

1803
static my_bool my_realloc_str(NET *net, ulong length)
1804
{
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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)
1809
  {
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    res= net_realloc(net, buf_length + length);
    net->write_pos= net->buff+ buf_length;
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  }
1813
  DBUG_RETURN(res);
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}


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/* Clear possible error statee of struct NET */

static void net_clear_error(NET *net)
{
  if (net->last_errno)
  {
    net->last_errno= 0;
    net->last_error[0]= '\0';
    strmov(net->sqlstate, not_error_sqlstate);
  }
}

1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
static void stmt_clear_error(MYSQL_STMT *stmt)
{
  if (stmt->last_errno)
  {
    stmt->last_errno= 0;
    stmt->last_error[0]= '\0';
    strmov(stmt->sqlstate, not_error_sqlstate);
  }
}

1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
/*
  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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1878
/*
1879
  Read and unpack server reply to COM_STMT_PREPARE command (sent from
1880
  mysql_stmt_prepare).
1881

1882 1883 1884 1885
  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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*/

1892
my_bool cli_read_prepare_result(MYSQL *mysql, MYSQL_STMT *stmt)
1893 1894
{
  uchar *pos;
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  uint field_count, param_count;
  ulong packet_length;
1897
  MYSQL_DATA *fields_data;
1898
  DBUG_ENTER("cli_read_prepare_result");
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1900
  mysql= mysql->last_used_con;
1901
  if ((packet_length= cli_safe_read(mysql)) == packet_error)
1902
    DBUG_RETURN(1);
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  mysql->warning_count= 0;
1904

1905
  pos= (uchar*) mysql->net.read_pos;
1906
  stmt->stmt_id= uint4korr(pos+1); pos+= 5;
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  /* Number of columns in result set */
1908
  field_count=   uint2korr(pos);   pos+= 2;
1909
  /* Number of placeholders in the statement */
1910
  param_count=   uint2korr(pos);   pos+= 2;
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  if (packet_length >= 12)
    mysql->warning_count= uint2korr(pos+1);
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  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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    if (!(fields_data= (*mysql->methods->read_rows)(mysql,(MYSQL_FIELD*)0,7)))
1930 1931 1932 1933 1934 1935
      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=  field_count;
1937
  stmt->param_count=  (ulong) param_count;
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  DBUG_PRINT("exit",("field_count: %u  param_count: %u  warning_count: %u",
                     field_count, param_count, (uint) mysql->warning_count));
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  DBUG_RETURN(0);
}


/*
1946 1947
  Allocate memory and init prepared statement structure.

1948 1949
  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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1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
  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);
  }

1989
  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_result_set;
1997
  stmt->prefetch_rows= DEFAULT_PREFETCH_ROWS;
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  strmov(stmt->sqlstate, not_error_sqlstate);
1999
  /* The rest of statement members was bzeroed inside malloc */
2000 2001 2002 2003

  DBUG_RETURN(stmt);
}

2004

2005
/*
2006 2007
  Prepare server side statement with query.

2008 2009
  SYNOPSIS
    mysql_stmt_prepare()
2010 2011 2012
    stmt    statement handle
    query   statement to prepare
    length  statement length
2013 2014

  DESCRIPTION
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
    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
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    structure on the server and free old statement data
2029
  - then send the query to server and get back number of placeholders,
2030
    number of columns in result set (if any), and result set metadata.
2031
    At the same time allocate memory for input and output parameters
2032
    to have less checks in mysql_stmt_bind_{param, result}.
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2034 2035
  RETURN VALUES
    0  success
2036
   !0  error
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*/

2039 2040
int STDCALL
mysql_stmt_prepare(MYSQL_STMT *stmt, const char *query, ulong length)
2041
{
2042 2043 2044
  MYSQL *mysql= stmt->mysql;
  DBUG_ENTER("mysql_stmt_prepare");

2045
  if (!mysql)
2046
  {
2047 2048
    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
2049
    DBUG_RETURN(1);
2050
  }
2051

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  /*
    Reset the last error in any case: that would clear the statement
    if the previous prepare failed.
  */
  stmt->last_errno= 0;
  stmt->last_error[0]= '\0';

2059 2060 2061
  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    /* This is second prepare with another statement */
2062
    char buff[MYSQL_STMT_HEADER];               /* 4 bytes - stmt id */
2063

2064
    if (reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT))
2065
      DBUG_RETURN(1);
2066
    /*
2067
      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;
    free_root(&stmt->mem_root, MYF(MY_KEEP_PREALLOC));

    int4store(buff, stmt->stmt_id);
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2076
    /*
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      Close statement in server

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      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.
    */
2083
    stmt->state= MYSQL_STMT_INIT_DONE;
2084
    if (stmt_command(mysql, COM_STMT_CLOSE, buff, 4, stmt))
2085 2086 2087 2088 2089 2090 2091
    {
      set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                      mysql->net.sqlstate);
      DBUG_RETURN(1);
    }
  }

2092
  if (stmt_command(mysql, COM_STMT_PREPARE, query, length, stmt))
2093
  {
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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))
2100 2101 2102
  {
    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                    mysql->net.sqlstate);
2103
    DBUG_RETURN(1);
2104
  }
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2106
  /*
2107
    alloc_root will return valid address even in case when param_count
2108 2109 2110 2111
    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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2112 2113
  if (!(stmt->params= (MYSQL_BIND *) alloc_root(&stmt->mem_root,
						sizeof(MYSQL_BIND)*
2114
                                                (stmt->param_count +
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                                                 stmt->field_count))))
  {
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
2118
    DBUG_RETURN(1);
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  }
  stmt->bind= stmt->params + stmt->param_count;
2121
  stmt->state= MYSQL_STMT_PREPARE_DONE;
2122
  DBUG_PRINT("info", ("Parameter count: %u", stmt->param_count));
2123
  DBUG_RETURN(0);
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}

2126
/*
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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.
2131 2132
*/

2133
static unsigned int alloc_stmt_fields(MYSQL_STMT *stmt)
2134
{
2135 2136
  MYSQL_FIELD *fields, *field, *end;
  MEM_ROOT *alloc= &stmt->mem_root;
2137
  MYSQL *mysql= stmt->mysql->last_used_con;
2138

2139
  stmt->field_count= mysql->field_count;
2140

2141
  /*
2142
    Get the field information for non-select statements
2143 2144
    like SHOW and DESCRIBE commands
  */
2145
  if (!(stmt->fields= (MYSQL_FIELD *) alloc_root(alloc,
2146
						 sizeof(MYSQL_FIELD) *
2147 2148
						 stmt->field_count)) ||
      !(stmt->bind= (MYSQL_BIND *) alloc_root(alloc,
2149 2150
					      sizeof(MYSQL_BIND) *
					      stmt->field_count)))
2151
    return 0;
2152 2153

  for (fields= mysql->fields, end= fields+stmt->field_count,
2154
	 field= stmt->fields;
2155 2156 2157 2158 2159 2160 2161
       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);
2162
    field->charsetnr= fields->charsetnr;
2163 2164 2165 2166 2167 2168 2169
    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;
  }
2170 2171
  return stmt->field_count;
}
2172

2173 2174 2175

/*
  Update result set columns metadata if it was sent again in
2176
  reply to COM_STMT_EXECUTE.
2177 2178 2179 2180 2181 2182 2183
*/

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;
2184
  MYSQL_BIND *my_bind= stmt->bind_result_done ? stmt->bind : 0;
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194

  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;
2195
    if (my_bind)
2196 2197
    {
      /* Ignore return value: it should be 0 if bind_result succeeded. */
2198
      (void) setup_one_fetch_function(my_bind++, stmt_field);
2199
    }
2200 2201 2202
  }
}

2203
/*
2204 2205 2206 2207 2208 2209 2210 2211 2212
  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
2213
    mysql_stmt_field_count(): if number of fields is not zero, you can call
2214 2215 2216 2217
    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
2218
      mysql_stmt_field_count())
2219 2220 2221 2222
    - 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.
2223 2224 2225 2226 2227 2228

  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
2229 2230 2231
*/

MYSQL_RES * STDCALL
2232
mysql_stmt_result_metadata(MYSQL_STMT *stmt)
2233 2234
{
  MYSQL_RES *result;
2235
  DBUG_ENTER("mysql_stmt_result_metadata");
2236

2237 2238 2239 2240 2241 2242 2243 2244 2245
  /*
    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))))
2246
  {
2247 2248 2249
    set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
    DBUG_RETURN(0);
  }
2250

2251 2252
  result->methods=	stmt->mysql->methods;
  result->eof=		1;                      /* Marker for buffered */
2253 2254
  result->fields=	stmt->fields;
  result->field_count=	stmt->field_count;
2255
  /* The rest of members of 'result' was bzeroed inside malloc */
2256
  DBUG_RETURN(result);
2257 2258
}

2259

2260
/*
2261 2262
  Returns parameter columns meta information in the form of
  result set.
2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275

  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.
2276 2277 2278
*/

MYSQL_RES * STDCALL
2279
mysql_stmt_param_metadata(MYSQL_STMT *stmt)
2280
{
2281
  DBUG_ENTER("mysql_stmt_param_metadata");
2282

2283 2284 2285 2286
  if (!stmt->param_count)
    DBUG_RETURN(0);

  /*
2287 2288
    TODO: Fix this when server sends the information.
    Till then keep a dummy prototype.
2289 2290 2291 2292 2293
  */
  DBUG_RETURN(0); 
}


2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
/* 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;
}


2304 2305
/*
  Functions to store parameter data in network packet.
2306

2307 2308 2309 2310 2311
  SYNOPSIS
    store_param_xxx()
    net			MySQL NET connection
    param		MySQL bind param

2312
  DESCRIPTION
2313 2314 2315 2316 2317
    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).
2318
*/
2319 2320 2321

static void store_param_tinyint(NET *net, MYSQL_BIND *param)
{
2322
  *(net->write_pos++)= *(uchar *) param->buffer;
2323 2324
}

2325 2326 2327 2328 2329 2330
static void store_param_short(NET *net, MYSQL_BIND *param)
{
  short value= *(short*) param->buffer;
  int2store(net->write_pos,value);
  net->write_pos+=2;
}
2331

2332
static void store_param_int32(NET *net, MYSQL_BIND *param)
2333
{
2334 2335 2336 2337
  int32 value= *(int32*) param->buffer;
  int4store(net->write_pos,value);
  net->write_pos+=4;
}
2338

2339 2340 2341 2342 2343 2344
static void store_param_int64(NET *net, MYSQL_BIND *param)
{
  longlong value= *(longlong*) param->buffer;
  int8store(net->write_pos,value);
  net->write_pos+= 8;
}
2345

2346 2347 2348 2349 2350
static void store_param_float(NET *net, MYSQL_BIND *param)
{
  float value= *(float*) param->buffer;
  float4store(net->write_pos, value);
  net->write_pos+= 4;
2351 2352
}

2353 2354 2355 2356 2357 2358
static void store_param_double(NET *net, MYSQL_BIND *param)
{
  double value= *(double*) param->buffer;
  float8store(net->write_pos, value);
  net->write_pos+= 8;
}
2359

2360 2361 2362
static void store_param_time(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
2363
  char buff[MAX_TIME_REP_LENGTH], *pos;
2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
  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)
2374
    length= 12;
2375 2376 2377 2378
  else if (tm->hour || tm->minute || tm->second || tm->day)
    length= 8;
  else
    length= 0;
2379
  buff[0]= (char) length++;
2380 2381 2382 2383 2384 2385
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void net_store_datetime(NET *net, MYSQL_TIME *tm)
{
2386
  char buff[MAX_DATETIME_REP_LENGTH], *pos;
2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405
  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;
2406
  buff[0]= (char) length++;
2407 2408 2409 2410 2411 2412
  memcpy((char *)net->write_pos, buff, length);
  net->write_pos+= length;
}

static void store_param_date(NET *net, MYSQL_BIND *param)
{
2413 2414 2415
  MYSQL_TIME tm= *((MYSQL_TIME *) param->buffer);
  tm.hour= tm.minute= tm.second= tm.second_part= 0;
  net_store_datetime(net, &tm);
2416 2417 2418 2419 2420 2421 2422
}

static void store_param_datetime(NET *net, MYSQL_BIND *param)
{
  MYSQL_TIME *tm= (MYSQL_TIME *) param->buffer;
  net_store_datetime(net, tm);
}
2423

2424
static void store_param_str(NET *net, MYSQL_BIND *param)
2425
{
2426 2427
  /* param->length is always set in mysql_stmt_bind_param */
  ulong length= *param->length;
2428 2429
  char *to= (char *) net_store_length((char *) net->write_pos, length);
  memcpy(to, param->buffer, length);
2430
  net->write_pos= (uchar*) to+length;
2431 2432
}

2433

2434
/*
2435 2436 2437 2438 2439 2440 2441 2442 2443
  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
2444 2445
    if a parameter is NULL. Unlike bit string in result set row, here
    we don't have reserved bits for OK/error packet.
2446 2447
*/

2448
static void store_param_null(NET *net, MYSQL_BIND *param)
2449
{
2450
  uint pos= param->param_number;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2451
  net->buff[pos/8]|=  (uchar) (1 << (pos & 7));
2452
}
2453 2454 2455


/*
2456 2457 2458
  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.
2459 2460
*/

2461
static my_bool store_param(MYSQL_STMT *stmt, MYSQL_BIND *param)
2462
{
2463
  NET *net= &stmt->mysql->net;
2464
  DBUG_ENTER("store_param");
2465
  DBUG_PRINT("enter",("type: %d  buffer: 0x%lx  length: %lu  is_null: %d",
2466
		      param->buffer_type,
2467 2468
		      (long) (param->buffer ? param->buffer : NullS),
                      *param->length, *param->is_null));
2469 2470

  if (*param->is_null)
2471 2472
    store_param_null(net, param);
  else
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2473
  {
2474 2475
    /*
      Param->length should ALWAYS point to the correct length for the type
2476
      Either to the length pointer given by the user or param->buffer_length
2477
    */
2478
    if ((my_realloc_str(net, *param->length)))
2479
    {
2480
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
venu@myvenu.com's avatar
venu@myvenu.com committed
2481
      DBUG_RETURN(1);
2482
    }
2483
    (*param->store_param_func)(net, param);
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venu@myvenu.com committed
2484 2485
  }
  DBUG_RETURN(0);
2486 2487
}

2488

2489
/*
2490
  Auxilary function to send COM_STMT_EXECUTE packet to server and read reply.
2491
  Used from cli_stmt_execute, which is in turn used by mysql_stmt_execute.
2492 2493
*/

2494
static my_bool execute(MYSQL_STMT *stmt, char *packet, ulong length)
2495
{
2496 2497
  MYSQL *mysql= stmt->mysql;
  NET	*net= &mysql->net;
2498
  char buff[4 /* size of stmt id */ +
2499
            5 /* execution flags */];
2500 2501
  my_bool res;

2502
  DBUG_ENTER("execute");
2503
  DBUG_DUMP("packet", packet, length);
2504

2505 2506
  mysql->last_used_con= mysql;
  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
2507
  buff[4]= (char) stmt->flags;
2508
  int4store(buff+5, 1);                         /* iteration count */
2509

2510
  res= test(cli_advanced_command(mysql, COM_STMT_EXECUTE, buff, sizeof(buff),
2511 2512 2513
                                 packet, length, 1, NULL) ||
            (*mysql->methods->read_query_result)(mysql));
  stmt->affected_rows= mysql->affected_rows;
2514
  stmt->server_status= mysql->server_status;
2515 2516
  stmt->insert_id= mysql->insert_id;
  if (res)
2517
  {
2518
    set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
2519
    DBUG_RETURN(1);
2520 2521 2522 2523
  }
  DBUG_RETURN(0);
}

2524 2525

int cli_stmt_execute(MYSQL_STMT *stmt)
2526
{
hf@deer.(none)'s avatar
SCRUM  
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2527
  DBUG_ENTER("cli_stmt_execute");
2528 2529 2530

  if (stmt->param_count)
  {
2531 2532
    MYSQL *mysql= stmt->mysql;
    NET        *net= &mysql->net;
2533
    MYSQL_BIND *param, *param_end;
2534
    char       *param_data;
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2535 2536 2537
    ulong length;
    uint null_count;
    my_bool    result;
2538

2539 2540 2541 2542 2543
    if (!stmt->bind_param_done)
    {
      set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2544 2545
    if (mysql->status != MYSQL_STATUS_READY ||
        mysql->server_status & SERVER_MORE_RESULTS_EXISTS)
2546 2547 2548 2549
    {
      set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2550

2551
    net_clear(net, 1);				/* Sets net->write_pos */
2552 2553
    /* Reserve place for null-marker bytes */
    null_count= (stmt->param_count+7) /8;
2554 2555 2556 2557 2558
    if (my_realloc_str(net, null_count + 1))
    {
      set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
      DBUG_RETURN(1);
    }
2559 2560 2561 2562 2563
    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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2564 2565
    *(net->write_pos)++= (uchar) stmt->send_types_to_server;
    if (stmt->send_types_to_server)
2566
    {
2567 2568 2569 2570 2571
      if (my_realloc_str(net, 2 * stmt->param_count))
      {
        set_stmt_error(stmt, net->last_errno, unknown_sqlstate);
        DBUG_RETURN(1);
      }
2572 2573 2574 2575 2576
      /*
	Store types of parameters in first in first package
	that is sent to the server.
      */
      for (param= stmt->params;	param < param_end ; param++)
2577
        store_param_type((char**) &net->write_pos, param);
2578 2579 2580
    }

    for (param= stmt->params; param < param_end; param++)
2581
    {
2582
      /* check if mysql_stmt_send_long_data() was used */
2583 2584
      if (param->long_data_used)
	param->long_data_used= 0;	/* Clear for next execute call */
2585
      else if (store_param(stmt, param))
2586
	DBUG_RETURN(1);
2587
    }
2588 2589
    length= (ulong) (net->write_pos - net->buff);
    /* TODO: Look into avoding the following memdup */
2590
    if (!(param_data= my_memdup((const char*) net->buff, length, MYF(0))))
2591
    {
2592
      set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
2593
      DBUG_RETURN(1);
2594
    }
2595
    result= execute(stmt, param_data, length);
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2596
    stmt->send_types_to_server=0;
2597
    my_free(param_data, MYF(MY_WME));
2598 2599 2600
    DBUG_RETURN(result);
  }
  DBUG_RETURN((int) execute(stmt,0,0));
2601 2602
}

2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
/*
  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)
{
2617
  if (stmt->data_cursor)
2618
  {
2619 2620
    *row= (uchar *) stmt->data_cursor->data;
    stmt->data_cursor= stmt->data_cursor->next;
2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640
    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
2641
                  stmt->last_{errno,error}; *row is not changed
2642
  MYSQL_NO_DATA - end of file was read from network;
2643
                  *row is set to NULL
2644 2645 2646 2647 2648 2649
*/

static int stmt_read_row_unbuffered(MYSQL_STMT *stmt, unsigned char **row)
{
  int rc= 1;
  MYSQL *mysql= stmt->mysql;
2650
  /*
2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661
    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 ?
2662
                   CR_FETCH_CANCELED : CR_COMMANDS_OUT_OF_SYNC,
2663 2664 2665 2666 2667 2668 2669
                   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);
2670 2671 2672 2673 2674 2675 2676
    /*
      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;
2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691
    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;
}

2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724

/*
  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);
2725
    int4store(buff + 4, stmt->prefetch_rows); /* number of rows to fetch */
2726
    if ((*mysql->methods->advanced_command)(mysql, COM_STMT_FETCH,
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2727 2728
                                            buff, sizeof(buff), NullS, 0,
                                            1, NULL))
2729 2730 2731 2732
    {
      set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
      return 1;
    }
2733
    if ((*mysql->methods->read_rows_from_cursor)(stmt))
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      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)))
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{
  return MYSQL_NO_DATA;
}

static int
stmt_read_row_no_result_set(MYSQL_STMT *stmt  __attribute__((unused)),
                      unsigned char **row  __attribute__((unused)))
2760
{
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  set_stmt_error(stmt, CR_NO_RESULT_SET, unknown_sqlstate);
  return 1;
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}

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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:
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  {
    ulong cursor_type;
    cursor_type= value ? *(ulong*) value : 0UL;
    if (cursor_type > (ulong) CURSOR_TYPE_READ_ONLY)
      goto err_not_implemented;
    stmt->flags= cursor_type;
    break;
  }
  case STMT_ATTR_PREFETCH_ROWS:
  {
    ulong prefetch_rows= value ? *(ulong*) value : DEFAULT_PREFETCH_ROWS;
    if (value == 0)
      return TRUE;
    stmt->prefetch_rows= prefetch_rows;
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    break;
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  }
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  default:
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    goto err_not_implemented;
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  }
  return FALSE;
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err_not_implemented:
  set_stmt_error(stmt, CR_NOT_IMPLEMENTED, unknown_sqlstate);
  return TRUE;
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}


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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:
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    *(my_bool*) value= stmt->update_max_length;
2823
    break;
2824
  case STMT_ATTR_CURSOR_TYPE:
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    *(ulong*) value= stmt->flags;
2826
    break;
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  case STMT_ATTR_PREFETCH_ROWS:
    *(ulong*) value= stmt->prefetch_rows;
    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)
  {
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    /* Error is already set in mysql_detatch_stmt_list */
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    DBUG_RETURN(1);
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  }

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  if (reset_stmt_handle(stmt, RESET_STORE_RESULT))
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    DBUG_RETURN(1);
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  /*
    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
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        COM_STMT_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;
    }
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    else if (stmt->flags & CURSOR_TYPE_READ_ONLY)
    {
      /*
        This is a single-row result set, a result set with no rows, EXPLAIN,
        SHOW VARIABLES, or some other command which either a) bypasses the
        cursors framework in the server and writes rows directly to the
        network or b) is more efficient if all (few) result set rows are
        precached on client and server's resources are freed.
      */
      DBUG_RETURN(mysql_stmt_store_result(stmt));
    }
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    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
*/

2965
ulong STDCALL mysql_stmt_param_count(MYSQL_STMT * stmt)
2966
{
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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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}
2979

2980

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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;

3016

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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().
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    my_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.
3043
    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:

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    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.
3159 3160 3161 3162 3163

    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
3164
    data in pieces, examples in tests/mysql_client_test.c.
3165 3166 3167 3168 3169 3170 3171 3172 3173 3174
    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.
3180 3181 3182 3183

  RETURN
    0  success
    1  error, can be retrieved with mysql_stmt_error.
3184 3185
*/

3186
my_bool STDCALL mysql_stmt_bind_param(MYSQL_STMT *stmt, MYSQL_BIND *my_bind)
3187
{
3188 3189
  uint count=0;
  MYSQL_BIND *param, *end;
3190
  DBUG_ENTER("mysql_stmt_bind_param");
3191

3192 3193 3194 3195 3196 3197 3198 3199 3200 3201
  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);
  }

3202
  /* Allocated on prepare */
3203
  memcpy((char*) stmt->params, (char*) my_bind,
3204 3205 3206 3207 3208
	 sizeof(MYSQL_BIND) * stmt->param_count);

  for (param= stmt->params, end= param+stmt->param_count;
       param < end ;
       param++)
3209
  {
3210
    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;

3217 3218
    /* Setup data copy functions for the different supported types */
    switch (param->buffer_type) {
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    case MYSQL_TYPE_NULL:
3220
      param->is_null= &int_is_null_true;
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      break;
3222
    case MYSQL_TYPE_TINY:
3223
      /* 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:
3239 3240
      param->length= &param->buffer_length;
      param->buffer_length= 8;
3241 3242 3243
      param->store_param_func= store_param_int64;
      break;
    case MYSQL_TYPE_FLOAT:
3244 3245
      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:
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      param->length= &param->buffer_length;
      param->buffer_length= 8;
3251 3252
      param->store_param_func= store_param_double;
      break;
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    case MYSQL_TYPE_TIME:
      param->store_param_func= store_param_time;
3255
      param->buffer_length= MAX_TIME_REP_LENGTH;
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      break;
    case MYSQL_TYPE_DATE:
      param->store_param_func= store_param_date;
3259
      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;
3264
      param->buffer_length= MAX_DATETIME_REP_LENGTH;
3265
      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:
3270
    case MYSQL_TYPE_VARCHAR:
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    case MYSQL_TYPE_VAR_STRING:
    case MYSQL_TYPE_STRING:
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    case MYSQL_TYPE_DECIMAL:
    case MYSQL_TYPE_NEWDECIMAL:
3275
      param->store_param_func= store_param_str;
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      /*
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        For variable length types user must set either length or
        buffer_length.
3279
      */
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      break;
    default:
3282
      strmov(stmt->sqlstate, unknown_sqlstate);
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      sprintf(stmt->last_error,
	      ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
3285
	      param->buffer_type, count);
3286
      DBUG_RETURN(1);
3287
    }
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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;
3294
  }
3295
  /* 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);
}

3301

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

/*
3307 3308 3309
  Send long data in pieces to the server

  SYNOPSIS
3310
    mysql_stmt_send_long_data()
3311 3312 3313 3314
    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)
3315

3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339
  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.

3340
  RETURN VALUES
3341 3342
    0	ok
    1	error
3343 3344
*/

3345
my_bool STDCALL
3346
mysql_stmt_send_long_data(MYSQL_STMT *stmt, uint param_number,
3347
		     const char *data, ulong length)
3348 3349
{
  MYSQL_BIND *param;
3350
  DBUG_ENTER("mysql_stmt_send_long_data");
3351
  DBUG_ASSERT(stmt != 0);
3352 3353
  DBUG_PRINT("enter",("param no: %d  data: 0x%lx, length : %ld",
		      param_number, (long) data, length));
3354

3355 3356 3357 3358 3359 3360 3361 3362 3363
  /*
    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);
  }
3364

3365
  param= stmt->params+param_number;
3366
  if (!IS_LONGDATA(param->buffer_type))
3367
  {
3368
    /* Long data handling should be used only for string/binary types */
3369
    strmov(stmt->sqlstate, unknown_sqlstate);
3370 3371 3372 3373
    sprintf(stmt->last_error, ER(stmt->last_errno= CR_INVALID_BUFFER_USE),
	    param->param_number);
    DBUG_RETURN(1);
  }
3374

3375
  /*
3376 3377 3378
    Send long data packet if there is data or we're sending long data
    for the first time.
  */
3379
  if (length || param->long_data_used == 0)
3380
  {
3381
    MYSQL *mysql= stmt->mysql;
3382
    /* Packet header: stmt id (4 bytes), param no (2 bytes) */
3383 3384
    char buff[MYSQL_LONG_DATA_HEADER];

3385 3386
    int4store(buff, stmt->stmt_id);
    int2store(buff + 4, param_number);
3387 3388
    param->long_data_used= 1;

3389 3390 3391 3392
    /*
      Note that we don't get any ok packet from the server in this case
      This is intentional to save bandwidth.
    */
3393 3394
    if ((*mysql->methods->advanced_command)(mysql, COM_STMT_SEND_LONG_DATA,
                                            buff, sizeof(buff), data,
3395
                                            length, 1, NULL))
3396
    {
3397 3398
      set_stmt_errmsg(stmt, mysql->net.last_error,
		      mysql->net.last_errno, mysql->net.sqlstate);
3399 3400 3401 3402 3403 3404
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}

3405

3406
/********************************************************************
3407
 Fetch and conversion of result set rows (binary protocol).
3408 3409
*********************************************************************/

3410 3411 3412 3413 3414 3415 3416 3417
/*
  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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3418 3419
          These functions increase pos to point to the beginning of the
          next column.
3420 3421 3422 3423 3424 3425

  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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3426
static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
3427
{
3428
  /* net_field_length will set pos to the first byte of data */
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3429 3430 3431
  uint length= net_field_length(pos);

  if (length)
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3432 3433 3434
  {
    uchar *to= *pos;
    tm->neg= (bool) to[0];
3435

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3436 3437 3438 3439 3440 3441
    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;
3442 3443 3444 3445 3446 3447
    if (tm->day)
    {
      /* Convert days to hours at once */
      tm->hour+= tm->day*24;
      tm->day= 0;
    }
3448 3449
    tm->time_type= MYSQL_TIMESTAMP_TIME;

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    *pos+= length;
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  }
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  else
3453
    set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
3454 3455
}

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3456
static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
3457
{
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3458
  uint length= net_field_length(pos);
3459

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3460
  if (length)
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3461 3462
  {
    uchar *to= *pos;
3463

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3464 3465 3466 3467
    tm->neg=    0;
    tm->year=   (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day=    (uint) to[3];
3468

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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;
3478
    tm->time_type= MYSQL_TIMESTAMP_DATETIME;
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3479 3480

    *pos+= length;
3481
  }
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3482
  else
3483
    set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
3484 3485
}

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3486
static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
3487
{
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3488
  uint length= net_field_length(pos);
3489

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3490
  if (length)
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3491 3492 3493 3494 3495
  {
    uchar *to= *pos;
    tm->year =  (uint) sint2korr(to);
    tm->month=  (uint) to[2];
    tm->day= (uint) to[3];
3496

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3497 3498 3499
    tm->hour= tm->minute= tm->second= 0;
    tm->second_part= 0;
    tm->neg= 0;
3500
    tm->time_type= MYSQL_TIMESTAMP_DATE;
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3501 3502

    *pos+= length;
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3503
  }
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3504
  else
3505
    set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
3506 3507
}

3508

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3509 3510 3511 3512 3513 3514 3515 3516 3517
/*
  Convert string to supplied buffer of any type.

  SYNOPSIS
    fetch_string_with_conversion()
    param   output buffer descriptor
    value   column data
    length  data length
*/
3518

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3519 3520
static void fetch_string_with_conversion(MYSQL_BIND *param, char *value,
                                         uint length)
3521
{
3522
  char *buffer= (char *)param->buffer;
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3523
  int err= 0;
3524
  char *endptr= value + length;
3525

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3526 3527 3528 3529
  /*
    This function should support all target buffer types: the rest
    of conversion functions can delegate conversion to it.
  */
3530
  switch (param->buffer_type) {
3531 3532
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3533
  case MYSQL_TYPE_TINY:
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3534
  {
3535
    longlong data= my_strtoll10(value, &endptr, &err);
3536
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3537
                                 INT_MIN8, INT_MAX8, UINT_MAX8) || err > 0);
3538
    *buffer= (uchar) data;
3539
    break;
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3540
  }
3541
  case MYSQL_TYPE_SHORT:
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3542
  {
3543
    longlong data= my_strtoll10(value, &endptr, &err);
3544
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3545
                                 INT_MIN16, INT_MAX16, UINT_MAX16) || err > 0);
3546
    shortstore(buffer, (short) data);
3547
    break;
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3548
  }
3549
  case MYSQL_TYPE_LONG:
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3550
  {
3551
    longlong data= my_strtoll10(value, &endptr, &err);
3552
    *param->error= (IS_TRUNCATED(data, param->is_unsigned,
3553
                                 INT_MIN32, INT_MAX32, UINT_MAX32) || err > 0);
3554
    longstore(buffer, (int32) data);
3555
    break;
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3556
  }
3557
  case MYSQL_TYPE_LONGLONG:
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3558
  {
3559 3560 3561
    longlong data= my_strtoll10(value, &endptr, &err);
    *param->error= param->is_unsigned ? err != 0 :
                                       (err > 0 || (err == 0 && data < 0));
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3562
    longlongstore(buffer, data);
3563
    break;
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3564
  }
3565
  case MYSQL_TYPE_FLOAT:
3566
  {
3567 3568 3569 3570
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    float fdata= (float) data;
    *param->error= (fdata != data) | test(err);
    floatstore(buffer, fdata);
3571 3572
    break;
  }
3573
  case MYSQL_TYPE_DOUBLE:
3574
  {
3575 3576
    double data= my_strntod(&my_charset_latin1, value, length, &endptr, &err);
    *param->error= test(err);
3577
    doublestore(buffer, data);
3578 3579
    break;
  }
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3580 3581 3582 3583
  case MYSQL_TYPE_TIME:
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
    str_to_time(value, length, tm, &err);
3584
    *param->error= test(err);
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3585 3586 3587 3588
    break;
  }
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_DATETIME:
3589
  case MYSQL_TYPE_TIMESTAMP:
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3590 3591
  {
    MYSQL_TIME *tm= (MYSQL_TIME *)buffer;
3592
    (void) str_to_datetime(value, length, tm, TIME_FUZZY_DATE, &err);
3593 3594
    *param->error= test(err) && (param->buffer_type == MYSQL_TYPE_DATE &&
                                 tm->time_type != MYSQL_TIMESTAMP_DATE);
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3595 3596 3597 3598 3599 3600
    break;
  }
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
3601 3602
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
3603
  default:
3604
  {
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3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618
    /*
      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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3619
    else
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3620 3621 3622
      copy_length= 0;
    if (copy_length < param->buffer_length)
      buffer[copy_length]= '\0';
3623
    *param->error= copy_length > param->buffer_length;
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3624 3625 3626 3627
    /*
      param->length will always contain length of entire column;
      number of copied bytes may be way different:
    */
3628
    *param->length= length;
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3629
    break;
3630
  }
3631
  }
3632 3633
}

3634

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3635 3636
/*
  Convert integer value to client buffer of any type.
3637

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3638 3639 3640 3641 3642 3643
  SYNOPSIS
    fetch_long_with_conversion()
    param   output buffer descriptor
    field   column metadata
    value   column data
*/
3644

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3645
static void fetch_long_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
3646
                                       longlong value, my_bool is_unsigned)
3647
{
3648
  char *buffer= (char *)param->buffer;
3649

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3650
  switch (param->buffer_type) {
3651 3652
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3653
  case MYSQL_TYPE_TINY:
3654
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3655
                                INT_MIN8, INT_MAX8, UINT_MAX8);
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3656
    *(uchar *)param->buffer= (uchar) value;
3657 3658
    break;
  case MYSQL_TYPE_SHORT:
3659
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3660
                                INT_MIN16, INT_MAX16, UINT_MAX16);
3661
    shortstore(buffer, (short) value);
3662 3663
    break;
  case MYSQL_TYPE_LONG:
3664
    *param->error= IS_TRUNCATED(value, param->is_unsigned,
3665
                                INT_MIN32, INT_MAX32, UINT_MAX32);
3666
    longstore(buffer, (int32) value);
3667 3668
    break;
  case MYSQL_TYPE_LONGLONG:
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3669
    longlongstore(buffer, value);
3670
    *param->error= param->is_unsigned != is_unsigned && value < 0;
3671 3672
    break;
  case MYSQL_TYPE_FLOAT:
3673
  {
3674
    /*
3675
      We need to mark the local variable volatile to
3676 3677 3678
      workaround Intel FPU executive precision feature.
      (See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
    */
3679
    volatile float data;
3680
    if (is_unsigned)
3681
    {
3682
      data= (float) ulonglong2double(value);
3683 3684
      *param->error= ((ulonglong) value) != ((ulonglong) data);
    }
3685
    else
3686 3687 3688 3689
    {
      data= (float)value;
      *param->error= value != ((longlong) data);
    }
3690
    floatstore(buffer, data);
3691 3692
    break;
  }
3693
  case MYSQL_TYPE_DOUBLE:
3694
  {
3695
    volatile double data;
3696
    if (is_unsigned)
3697
    {
3698
      data= ulonglong2double(value);
3699 3700
      *param->error= ((ulonglong) value) != ((ulonglong) data);
    }
3701
    else
3702
    {
3703
      data= (double)value;
3704 3705
      *param->error= value != ((longlong) data);
    }
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3706
    doublestore(buffer, data);
3707 3708
    break;
  }
3709 3710 3711 3712 3713 3714
  case MYSQL_TYPE_TIME:
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATETIME:
  {
    int error;
3715 3716
    value= number_to_datetime(value, (MYSQL_TIME *) buffer, TIME_FUZZY_DATE,
                              &error);
3717 3718 3719
    *param->error= test(error);
    break;
  }
3720
  default:
3721
  {
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3722
    char buff[22];                              /* Enough for longlong */
3723
    char *end= longlong10_to_str(value, buff, is_unsigned ? 10: -10);
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3724
    /* Resort to string conversion which supports all typecodes */
3725 3726 3727 3728 3729 3730 3731 3732 3733 3734
    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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3735
    break;
3736
  }
3737
  }
3738 3739
}

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3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750
/*
  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
*/
3751

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3752 3753
static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                        double value, int width)
3754
{
3755
  char *buffer= (char *)param->buffer;
3756
  double val64 = (value < 0 ? -floor(-value) : floor(value));
3757

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3758
  switch (param->buffer_type) {
3759 3760
  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3761
  case MYSQL_TYPE_TINY:
3762 3763 3764 3765 3766 3767
    /*
      We need to _store_ data in the buffer before the truncation check to
      workaround Intel FPU executive precision feature.
      (See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=323 for details)
      Sic: AFAIU it does not guarantee to work.
    */
3768
    if (param->is_unsigned)
3769
      *buffer= (uint8) value;
3770
    else
3771
      *buffer= (int8) value;
3772 3773
    *param->error= val64 != (param->is_unsigned ? (double)((uint8) *buffer) :
                                                  (double)((int8) *buffer));
3774 3775
    break;
  case MYSQL_TYPE_SHORT:
3776 3777 3778 3779 3780 3781 3782 3783 3784 3785
    if (param->is_unsigned)
    {
      ushort data= (ushort) value;
      shortstore(buffer, data);
    }
    else
    {
      short data= (short) value;
      shortstore(buffer, data);
    }
3786
    *param->error= val64 != (param->is_unsigned ? (double) (*(ushort*) buffer):
3787
                                                  (double) (*(short*) buffer));
3788 3789
    break;
  case MYSQL_TYPE_LONG:
3790 3791 3792 3793 3794 3795 3796 3797 3798 3799
    if (param->is_unsigned)
    {
      uint32 data= (uint32) value;
      longstore(buffer, data);
    }
    else
    {
      int32 data= (int32) value;
      longstore(buffer, data);
    }
3800
    *param->error= val64 != (param->is_unsigned ? (double) (*(uint32*) buffer):
3801 3802
                                                  (double) (*(int32*) buffer));
      break;
3803
  case MYSQL_TYPE_LONGLONG:
3804 3805 3806 3807 3808 3809 3810 3811 3812 3813
    if (param->is_unsigned)
    {
      ulonglong data= (ulonglong) value;
      longlongstore(buffer, data);
    }
    else
    {
      longlong data= (longlong) value;
      longlongstore(buffer, data);
    }
3814
    *param->error= val64 != (param->is_unsigned ?
3815
                             ulonglong2double(*(ulonglong*) buffer) :
3816
                             (double) (*(longlong*) buffer));
3817 3818 3819
    break;
  case MYSQL_TYPE_FLOAT:
  {
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3820
    float data= (float) value;
3821
    floatstore(buffer, data);
3822
    *param->error= (*(float*) buffer) != value;
3823 3824 3825 3826
    break;
  }
  case MYSQL_TYPE_DOUBLE:
  {
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    doublestore(buffer, value);
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    break;
  }
3830
  default:
3831
  {
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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
    */
3837
    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
3841
    if (field->decimals >= NOT_FIXED_DEC)
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3842 3843
#undef NOT_FIXED_DEC
    {
3844 3845 3846 3847 3848 3849 3850 3851
      /*
        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));
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    break;
  }
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  }
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}

3866

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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,
3876
                                           MYSQL_FIELD *field,
3877
                                           MYSQL_TIME *my_time)
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{
  switch (param->buffer_type) {
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  case MYSQL_TYPE_NULL: /* do nothing */
    break;
3882
  case MYSQL_TYPE_DATE:
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    *(MYSQL_TIME *)(param->buffer)= *my_time;
    *param->error= my_time->time_type != MYSQL_TIMESTAMP_DATE;
3885
    break;
3886
  case MYSQL_TYPE_TIME:
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    *(MYSQL_TIME *)(param->buffer)= *my_time;
    *param->error= my_time->time_type != MYSQL_TIMESTAMP_TIME;
3889
    break;
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  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
3892
    *(MYSQL_TIME *)(param->buffer)= *my_time;
3893
    /* No error: time and date are compatible with datetime */
3894
    break;
3895
  case MYSQL_TYPE_YEAR:
3896
    shortstore(param->buffer, my_time->year);
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    *param->error= 1;
    break;
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
  {
3902
    ulonglong value= TIME_to_ulonglong(my_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:
  {
3913
    longlong value= (longlong) TIME_to_ulonglong(my_time);
3914
    fetch_long_with_conversion(param, field, value, TRUE);
3915
    break;
3916
  }
3917 3918
  default:
  {
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    /*
      Convert time value  to string and delegate the rest to
      fetch_string_with_conversion:
    */
3923
    char buff[MAX_DATE_STRING_REP_LENGTH];
3924
    uint length= my_TIME_to_str(my_time, buff);
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    /* Resort to string conversion */
    fetch_string_with_conversion(param, (char *)buff, length);
    break;
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  }
  }
}
3931

3932

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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.
*/
3948

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3949 3950
static void fetch_result_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
                                         uchar **row)
3951
{
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3952
  enum enum_field_types field_type= field->type;
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  uint field_is_unsigned= field->flags & UNSIGNED_FLAG;
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  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;
3962
    fetch_long_with_conversion(param, field, data, 0);
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    *row+= 1;
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    break;
  }
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_YEAR:
  {
3969
    short value= sint2korr(*row);
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3970 3971
    longlong data= field_is_unsigned ? (longlong) (unsigned short) value :
                                       (longlong) value;
3972
    fetch_long_with_conversion(param, field, data, 0);
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3973
    *row+= 2;
3974 3975
    break;
  }
3976
  case MYSQL_TYPE_INT24: /* mediumint is sent as 4 bytes int */
3977 3978
  case MYSQL_TYPE_LONG:
  {
3979 3980
    int32 value= sint4korr(*row);
    longlong data= field_is_unsigned ? (longlong) (uint32) value :
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3981
                                       (longlong) value;
3982
    fetch_long_with_conversion(param, field, data, 0);
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3983
    *row+= 4;
3984 3985 3986 3987 3988
    break;
  }
  case MYSQL_TYPE_LONGLONG:
  {
    longlong value= (longlong)sint8korr(*row);
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    fetch_long_with_conversion(param, field, value,
                               field->flags & UNSIGNED_FLAG);
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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;
4008 4009 4010 4011
    break;
  }
  case MYSQL_TYPE_DATE:
  {
4012
    MYSQL_TIME tm;
4013

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4014
    read_binary_date(&tm, row);
4015
    fetch_datetime_with_conversion(param, field, &tm);
4016 4017 4018 4019
    break;
  }
  case MYSQL_TYPE_TIME:
  {
4020
    MYSQL_TIME tm;
4021

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4022
    read_binary_time(&tm, row);
4023
    fetch_datetime_with_conversion(param, field, &tm);
4024 4025 4026 4027 4028 4029
    break;
  }
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
  {
    MYSQL_TIME tm;
4030

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4031
    read_binary_datetime(&tm, row);
4032
    fetch_datetime_with_conversion(param, field, &tm);
4033 4034
    break;
  }
4035
  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;
4040 4041
    break;
  }
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4042
  }
4043 4044
}

4045

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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
*/

4065 4066
static void fetch_result_tinyint(MYSQL_BIND *param, MYSQL_FIELD *field,
                                 uchar **row)
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{
4068 4069 4070
  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  uchar data= **row;
  *(uchar *)param->buffer= data;
4071
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX8;
4072
  (*row)++;
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}

4075 4076
static void fetch_result_short(MYSQL_BIND *param, MYSQL_FIELD *field,
                               uchar **row)
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4077
{
4078 4079 4080
  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ushort data= (ushort) sint2korr(*row);
  shortstore(param->buffer, data);
4081
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX16;
4082
  *row+= 2;
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}

4085 4086 4087
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);
4092
  *param->error= param->is_unsigned != field_is_unsigned && data > INT_MAX32;
4093
  *row+= 4;
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}

4096 4097 4098
static void fetch_result_int64(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
4099
{
4100 4101
  my_bool field_is_unsigned= test(field->flags & UNSIGNED_FLAG);
  ulonglong data= (ulonglong) sint8korr(*row);
4102
  *param->error= param->is_unsigned != field_is_unsigned && data > LONGLONG_MAX;
4103
  longlongstore(param->buffer, data);
4104
  *row+= 8;
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}

4107 4108 4109
static void fetch_result_float(MYSQL_BIND *param,
                               MYSQL_FIELD *field __attribute__((unused)),
                               uchar **row)
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4110 4111 4112
{
  float value;
  float4get(value,*row);
4113
  floatstore(param->buffer, value);
4114
  *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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4120 4121 4122
{
  double value;
  float8get(value,*row);
4123
  doublestore(param->buffer, value);
4124
  *row+= 8;
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}

4127 4128 4129
static void fetch_result_time(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
4130 4131
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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4132
  read_binary_time(tm, row);
4133 4134
}

4135 4136 4137
static void fetch_result_date(MYSQL_BIND *param,
                              MYSQL_FIELD *field __attribute__((unused)),
                              uchar **row)
4138 4139
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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4140
  read_binary_date(tm, row);
4141 4142
}

4143 4144 4145
static void fetch_result_datetime(MYSQL_BIND *param,
                                  MYSQL_FIELD *field __attribute__((unused)),
                                  uchar **row)
4146 4147
{
  MYSQL_TIME *tm= (MYSQL_TIME *)param->buffer;
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  read_binary_datetime(tm, row);
4149 4150
}

4151 4152 4153
static void fetch_result_bin(MYSQL_BIND *param,
                             MYSQL_FIELD *field __attribute__((unused)),
                             uchar **row)
4154
{
4155 4156 4157
  ulong length= net_field_length(row);
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
4158
  *param->length= length;
4159
  *param->error= copy_length < length;
4160 4161
  *row+= length;
}
4162

4163 4164 4165
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);
4168 4169
  ulong copy_length= min(length, param->buffer_length);
  memcpy(param->buffer, (char *)*row, copy_length);
4170 4171
  /* Add an end null if there is room in the buffer */
  if (copy_length != param->buffer_length)
4172
    ((uchar *)param->buffer)[copy_length]= '\0';
4173
  *param->length= length;			/* return total length */
4174
  *param->error= copy_length < length;
4175
  *row+= length;
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}

4178

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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;
}


4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232
/*
  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
4233 4234 4235
    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 },
4236 4237 4238
    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,
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                MYSQL_TYPE_DECIMAL, MYSQL_TYPE_NULL };
  static const enum enum_field_types
4241 4242
   *range_list[]= { range1, range2, range3, range4 },
   **range_list_end= range_list + sizeof(range_list)/sizeof(*range_list);
4243
   const enum enum_field_types **range, *type;
4244 4245 4246 4247 4248 4249 4250

  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;
4251
    for (type= *range; *type != MYSQL_TYPE_NULL; type++)
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    {
      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)
{
4290 4291
  DBUG_ENTER("setup_one_fetch_function");

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  /* 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:
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  case MYSQL_TYPE_BIT:
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    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_bin;
    break;
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_STRING:
4350 4351
  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
4352 4353 4354 4355
    DBUG_ASSERT(param->buffer_length != 0);
    param->fetch_result= fetch_result_str;
    break;
  default:
4356 4357 4358
    DBUG_PRINT("error", ("Unknown param->buffer_type: %u",
                         (uint) param->buffer_type));
    DBUG_RETURN(TRUE);
4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412
  }
  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:
4413
  case MYSQL_TYPE_NEWDECIMAL:
4414 4415 4416 4417 4418 4419 4420 4421 4422
  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:
ramil@mysql.com's avatar
ramil@mysql.com committed
4423
  case MYSQL_TYPE_BIT:
4424 4425 4426
    param->skip_result= skip_result_string;
    break;
  default:
4427 4428
    DBUG_PRINT("error", ("Unknown field->type: %u", (uint) field->type));
    DBUG_RETURN(TRUE);
4429
  }
4430
  DBUG_RETURN(FALSE);
4431 4432 4433
}


4434
/*
4435
  Setup the bind buffers for resultset processing
4436 4437
*/

4438
my_bool STDCALL mysql_stmt_bind_result(MYSQL_STMT *stmt, MYSQL_BIND *my_bind)
4439
{
4440
  MYSQL_BIND *param, *end;
4441
  MYSQL_FIELD *field;
4442
  ulong       bind_count= stmt->field_count;
4443
  uint        param_count= 0;
4444
  DBUG_ENTER("mysql_stmt_bind_result");
4445
  DBUG_PRINT("enter",("field_count: %lu", bind_count));
4446

4447
  if (!bind_count)
4448
  {
4449 4450 4451 4452
    int errorcode= (int) stmt->state < (int) MYSQL_STMT_PREPARE_DONE ?
                   CR_NO_PREPARE_STMT : CR_NO_STMT_METADATA;
    set_stmt_error(stmt, errorcode, unknown_sqlstate);
    DBUG_RETURN(1);
4453 4454 4455 4456 4457
  }

  /*
    We only need to check that stmt->field_count - if it is not null
    stmt->bind was initialized in mysql_stmt_prepare
4458 4459 4460
    stmt->bind overlaps with bind if mysql_stmt_bind_param
    is called from mysql_stmt_store_result.
  */
4461

4462 4463 4464
  if (stmt->bind != my_bind)
    memcpy((char*) stmt->bind, (char*) my_bind,
           sizeof(MYSQL_BIND) * bind_count);
4465

4466 4467 4468
  for (param= stmt->bind, end= param + bind_count, field= stmt->fields ;
       param < end ;
       param++, field++)
4469
  {
4470 4471
    DBUG_PRINT("info",("buffer_type: %u  field_type: %u",
                       (uint) param->buffer_type, (uint) field->type));
4472 4473
    /*
      Set param->is_null to point to a dummy variable if it's not set.
4474
      This is to make the execute code easier
4475 4476
    */
    if (!param->is_null)
4477
      param->is_null= &param->is_null_value;
4478

4479
    if (!param->length)
4480 4481 4482 4483
      param->length= &param->length_value;

    if (!param->error)
      param->error= &param->error_value;
4484

4485
    param->param_number= param_count++;
4486 4487
    param->offset= 0;

4488 4489
    if (setup_one_fetch_function(param, field))
    {
4490 4491
      strmov(stmt->sqlstate, unknown_sqlstate);
      sprintf(stmt->last_error,
4492 4493
              ER(stmt->last_errno= CR_UNSUPPORTED_PARAM_TYPE),
              field->type, param_count);
4494 4495
      DBUG_RETURN(1);
    }
4496
  }
4497 4498 4499 4500
  stmt->bind_result_done= BIND_RESULT_DONE;
  if (stmt->mysql->options.report_data_truncation)
    stmt->bind_result_done|= REPORT_DATA_TRUNCATION;

4501 4502 4503
  DBUG_RETURN(0);
}

4504

4505
/*
4506
  Fetch row data to bind buffers
4507 4508
*/

4509
static int stmt_fetch_row(MYSQL_STMT *stmt, uchar *row)
4510
{
4511
  MYSQL_BIND  *my_bind, *end;
4512
  MYSQL_FIELD *field;
4513
  uchar *null_ptr, bit;
4514
  int truncation_count= 0;
4515 4516 4517 4518 4519 4520
  /*
    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);
4521

4522 4523 4524
  if (!stmt->bind_result_done)
  {
    /* If output parameters were not bound we should just return success */
4525
    return 0;
4526
  }
4527 4528

  null_ptr= row;
4529 4530
  row+= (stmt->field_count+9)/8;		/* skip null bits */
  bit= 4;					/* first 2 bits are reserved */
4531

venu@myvenu.com's avatar
venu@myvenu.com committed
4532
  /* Copy complete row to application buffers */
4533 4534 4535 4536
  for (my_bind= stmt->bind, end= my_bind + stmt->field_count,
         field= stmt->fields ;
       my_bind < end ;
       my_bind++, field++)
4537
  {
4538
    *my_bind->error= 0;
4539
    if (*null_ptr & bit)
4540 4541
    {
      /*
4542
        We should set both row_ptr and is_null to be able to see
4543 4544 4545 4546 4547
        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.
      */
4548 4549
      my_bind->row_ptr= NULL;
      *my_bind->is_null= 1;
4550
    }
4551
    else
4552
    {
4553 4554 4555 4556
      *my_bind->is_null= 0;
      my_bind->row_ptr= row;
      (*my_bind->fetch_result)(my_bind, field, &row);
      truncation_count+= *my_bind->error;
4557
    }
4558
    if (!((bit<<=1) & 255))
4559
    {
4560
      bit= 1;					/* To next uchar */
4561
      null_ptr++;
4562 4563
    }
  }
4564 4565
  if (truncation_count && (stmt->bind_result_done & REPORT_DATA_TRUNCATION))
    return MYSQL_DATA_TRUNCATED;
4566 4567 4568
  return 0;
}

4569

4570
int cli_unbuffered_fetch(MYSQL *mysql, char **row)
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4571
{
4572
  if (packet_error == cli_safe_read(mysql))
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4573 4574
    return 1;

4575 4576
  *row= ((mysql->net.read_pos[0] == 254) ? NULL :
	 (char*) (mysql->net.read_pos+1));
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4577 4578
  return 0;
}
4579

4580

4581
/*
4582
  Fetch and return row data to bound buffers, if any
4583 4584
*/

4585
int STDCALL mysql_stmt_fetch(MYSQL_STMT *stmt)
4586
{
4587
  int rc;
4588
  uchar *row;
4589
  DBUG_ENTER("mysql_stmt_fetch");
4590

4591
  if ((rc= (*stmt->read_row_func)(stmt, &row)) ||
4592
      ((rc= stmt_fetch_row(stmt, row)) && rc != MYSQL_DATA_TRUNCATED))
4593
  {
4594
    stmt->state= MYSQL_STMT_PREPARE_DONE;       /* XXX: this is buggy */
4595 4596
    stmt->read_row_func= (rc == MYSQL_NO_DATA) ? 
      stmt_read_row_no_data : stmt_read_row_no_result_set;
4597
  }
4598
  else
4599
  {
4600 4601
    /* This is to know in mysql_stmt_fetch_column that data was fetched */
    stmt->state= MYSQL_STMT_FETCH_DONE;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4602
  }
4603
  DBUG_RETURN(rc);
4604 4605
}

4606

4607
/*
4608
  Fetch data for one specified column data
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4609 4610

  SYNOPSIS
4611
    mysql_stmt_fetch_column()
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4612
    stmt		Prepared statement handler
4613
    my_bind		Where data should be placed. Should be filled in as
4614
			when calling mysql_stmt_bind_result()
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4615 4616 4617
    column		Column to fetch (first column is 0)
    ulong offset	Offset in result data (to fetch blob in pieces)
			This is normally 0
4618
  RETURN
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4619 4620
    0	ok
    1	error
4621 4622
*/

4623
int STDCALL mysql_stmt_fetch_column(MYSQL_STMT *stmt, MYSQL_BIND *my_bind,
4624
                                    uint column, ulong offset)
4625
{
4626
  MYSQL_BIND *param= stmt->bind+column;
4627
  DBUG_ENTER("mysql_stmt_fetch_column");
4628

4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639
  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);
  }

4640 4641 4642
  if (!my_bind->error)
    my_bind->error= &my_bind->error_value;
  *my_bind->error= 0;
4643
  if (param->row_ptr)
4644
  {
4645
    MYSQL_FIELD *field= stmt->fields+column;
4646
    uchar *row= param->row_ptr;
4647 4648 4649 4650 4651
    my_bind->offset= offset;
    if (my_bind->is_null)
      *my_bind->is_null= 0;
    if (my_bind->length) /* Set the length if non char/binary types */
      *my_bind->length= *param->length;
4652
    else
4653 4654
      my_bind->length= &param->length_value;       /* Needed for fetch_result() */
    fetch_result_with_conversion(my_bind, field, &row);
4655
  }
4656 4657
  else
  {
4658 4659
    if (my_bind->is_null)
      *my_bind->is_null= 1;
4660
  }
4661 4662 4663 4664
  DBUG_RETURN(0);
}


4665
/*
4666 4667 4668
  Read all rows of data from server  (binary format)
*/

4669
int cli_read_binary_rows(MYSQL_STMT *stmt)
4670 4671 4672 4673
{
  ulong      pkt_len;
  uchar      *cp;
  MYSQL      *mysql= stmt->mysql;
4674 4675
  MYSQL_DATA *result= &stmt->result;
  MYSQL_ROWS *cur, **prev_ptr= &result->data;
4676
  NET        *net = &mysql->net;
4677
  DBUG_ENTER("cli_read_binary_rows");
4678

4679
  mysql= mysql->last_used_con;
4680

4681
  while ((pkt_len= cli_safe_read(mysql)) != packet_error)
4682
  {
4683 4684
    cp= net->read_pos;
    if (cp[0] != 254 || pkt_len >= 8)
4685
    {
4686 4687 4688 4689
      if (!(cur= (MYSQL_ROWS*) alloc_root(&result->alloc,
                                          sizeof(MYSQL_ROWS) + pkt_len - 1)))
      {
        set_stmt_error(stmt, CR_OUT_OF_MEMORY, unknown_sqlstate);
4690
        goto err;
4691 4692 4693 4694 4695
      }
      cur->data= (MYSQL_ROW) (cur+1);
      *prev_ptr= cur;
      prev_ptr= &cur->next;
      memcpy((char *) cur->data, (char *) cp+1, pkt_len-1);
4696 4697
      cur->length= pkt_len;		/* To allow us to do sanity checks */
      result->rows++;
4698
    }
4699
    else
4700
    {
4701 4702 4703 4704
      /* end of data */
      *prev_ptr= 0;
      mysql->warning_count= uint2korr(cp+1);
      mysql->server_status= uint2korr(cp+3);
4705 4706
      DBUG_PRINT("info",("status: %u  warning_count: %u",
                         mysql->server_status, mysql->warning_count));
4707 4708 4709
      DBUG_RETURN(0);
    }
  }
4710
  set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
4711 4712

err:
4713
  DBUG_RETURN(1);
4714 4715
}

4716

4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730
/*
  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)
{
4731
  MYSQL_BIND  *my_bind, *end;
4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742
  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 */

4743
  /* Go through all fields and calculate metadata */
4744 4745 4746
  for (my_bind= stmt->bind, end= my_bind + stmt->field_count, field= stmt->fields ;
       my_bind < end ;
       my_bind++, field++)
4747 4748
  {
    if (!(*null_ptr & bit))
4749
      (*my_bind->skip_result)(my_bind, field, &row);
4750 4751 4752
    DBUG_ASSERT(row <= row_end);
    if (!((bit<<=1) & 255))
    {
4753
      bit= 1;					/* To next uchar */
4754 4755 4756 4757 4758 4759
      null_ptr++;
    }
  }
}


4760 4761 4762 4763 4764 4765 4766
/*
  Store or buffer the binary results to stmt
*/

int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
{
  MYSQL *mysql= stmt->mysql;
4767
  MYSQL_DATA *result= &stmt->result;
4768
  DBUG_ENTER("mysql_stmt_store_result");
4769 4770 4771 4772 4773

  mysql= mysql->last_used_con;

  if (!stmt->field_count)
    DBUG_RETURN(0);
4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794

  if ((int) stmt->state < (int) MYSQL_STMT_EXECUTE_DONE)
  {
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
    DBUG_RETURN(1);
  }

  if (mysql->status == MYSQL_STATUS_READY &&
      stmt->server_status & SERVER_STATUS_CURSOR_EXISTS)
  {
    /*
      Server side cursor exist, tell server to start sending the rows
    */
    NET *net= &mysql->net;
    char buff[4 /* statement id */ +
              4 /* number of rows to fetch */];

    /* Send row request to the server */
    int4store(buff, stmt->stmt_id);
    int4store(buff + 4, (int)~0); /* number of rows to fetch */
    if (cli_advanced_command(mysql, COM_STMT_FETCH, buff, sizeof(buff),
4795
                             NullS, 0, 1, NULL))
4796 4797 4798 4799 4800 4801
    {
      set_stmt_errmsg(stmt, net->last_error, net->last_errno, net->sqlstate);
      DBUG_RETURN(1);
    }
  }
  else if (mysql->status != MYSQL_STATUS_GET_RESULT)
4802
  {
4803
    set_stmt_error(stmt, CR_COMMANDS_OUT_OF_SYNC, unknown_sqlstate);
4804
    DBUG_RETURN(1);
4805
  }
4806

4807 4808 4809 4810 4811 4812
  if (stmt->update_max_length && !stmt->bind_result_done)
  {
    /*
      We must initalize the bind structure to be able to calculate
      max_length
    */
4813
    MYSQL_BIND  *my_bind, *end;
4814 4815 4816
    MYSQL_FIELD *field;
    bzero((char*) stmt->bind, sizeof(*stmt->bind)* stmt->field_count);

4817 4818 4819 4820
    for (my_bind= stmt->bind, end= my_bind + stmt->field_count,
           field= stmt->fields;
	 my_bind < end ;
	 my_bind++, field++)
4821
    {
4822 4823
      my_bind->buffer_type= MYSQL_TYPE_NULL;
      my_bind->buffer_length=1;
4824 4825
    }

4826 4827
    if (mysql_stmt_bind_result(stmt, stmt->bind))
      DBUG_RETURN(1);
4828 4829 4830
    stmt->bind_result_done= 0;			/* No normal bind done */
  }

4831
  if ((*mysql->methods->read_binary_rows)(stmt))
4832
  {
4833 4834 4835
    free_root(&result->alloc, MYF(MY_KEEP_PREALLOC));
    result->data= NULL;
    result->rows= 0;
4836
    mysql->status= MYSQL_STATUS_READY;
4837
    DBUG_RETURN(1);
4838
  }
4839

4840 4841 4842 4843
  /* Assert that if there was a cursor, all rows have been fetched */
  DBUG_ASSERT(mysql->status != MYSQL_STATUS_READY ||
              (mysql->server_status & SERVER_STATUS_LAST_ROW_SENT));

4844 4845 4846 4847 4848 4849 4850
  if (stmt->update_max_length)
  {
    MYSQL_ROWS *cur= result->data;
    for(; cur; cur=cur->next)
      stmt_update_metadata(stmt, cur);
  }

4851 4852
  stmt->data_cursor= result->data;
  mysql->affected_rows= stmt->affected_rows= result->rows;
4853 4854 4855
  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 */
4856
  DBUG_RETURN(0); /* Data buffered, must be fetched with mysql_stmt_fetch() */
4857 4858
}

4859

4860 4861 4862 4863 4864 4865 4866
/*
  Seek to desired row in the statement result set
*/

MYSQL_ROW_OFFSET STDCALL
mysql_stmt_row_seek(MYSQL_STMT *stmt, MYSQL_ROW_OFFSET row)
{
4867
  MYSQL_ROW_OFFSET offset= stmt->data_cursor;
4868
  DBUG_ENTER("mysql_stmt_row_seek");
4869

4870 4871
  stmt->data_cursor= row;
  DBUG_RETURN(offset);
4872 4873
}

4874

4875 4876 4877 4878
/*
  Return the current statement row cursor position
*/

4879
MYSQL_ROW_OFFSET STDCALL
4880 4881 4882
mysql_stmt_row_tell(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_row_tell");
4883

4884
  DBUG_RETURN(stmt->data_cursor);
4885 4886
}

4887

4888 4889 4890 4891 4892 4893 4894
/*
  Move the stmt result set data cursor to specified row
*/

void STDCALL
mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
{
4895
  MYSQL_ROWS *tmp= stmt->result.data;
4896 4897
  DBUG_ENTER("mysql_stmt_data_seek");
  DBUG_PRINT("enter",("row id to seek: %ld",(long) row));
4898

4899 4900 4901
  for (; tmp && row; --row, tmp= tmp->next)
    ;
  stmt->data_cursor= tmp;
4902 4903 4904 4905 4906 4907
  if (!row && tmp)
  {
       /*  Rewind the counter */
    stmt->read_row_func= stmt_read_row_buffered;
    stmt->state= MYSQL_STMT_EXECUTE_DONE;
  }
4908
  DBUG_VOID_RETURN;
4909 4910
}

4911

4912 4913 4914 4915 4916 4917 4918
/*
  Return total rows the current statement result set
*/

my_ulonglong STDCALL mysql_stmt_num_rows(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_num_rows");
4919

4920
  DBUG_RETURN(stmt->result.rows);
4921
}
4922

4923

4924 4925 4926 4927 4928
/*
  Free the client side memory buffers, reset long data state
  on client if necessary, and reset the server side statement if
  this has been requested.
*/
4929

4930 4931 4932
static my_bool reset_stmt_handle(MYSQL_STMT *stmt, uint flags)
{
  /* If statement hasn't been prepared there is nothing to reset */
4933 4934 4935
  if ((int) stmt->state > (int) MYSQL_STMT_INIT_DONE)
  {
    MYSQL *mysql= stmt->mysql;
4936
    MYSQL_DATA *result= &stmt->result;
4937

4938 4939 4940 4941
    /*
      Reset stored result set if so was requested or it's a part
      of cursor fetch.
    */
4942
    if (result->data && (flags & RESET_STORE_RESULT))
4943 4944
    {
      /* Result buffered */
4945 4946 4947 4948
      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 (flags & RESET_LONG_DATA)
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    {
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      MYSQL_BIND *param= stmt->params, *param_end= param + stmt->param_count;
      /* Clear long_data_used flags */
      for (; param < param_end; param++)
        param->long_data_used= 0;
    }
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    stmt->read_row_func= stmt_read_row_no_result_set;
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    if (mysql)
    {
      if ((int) stmt->state > (int) MYSQL_STMT_PREPARE_DONE)
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      {
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        if (mysql->unbuffered_fetch_owner == &stmt->unbuffered_fetch_cancelled)
          mysql->unbuffered_fetch_owner= 0;
        if (stmt->field_count && mysql->status != MYSQL_STATUS_READY)
        {
          /* There is a result set and it belongs to this statement */
          (*mysql->methods->flush_use_result)(mysql);
          if (mysql->unbuffered_fetch_owner)
            *mysql->unbuffered_fetch_owner= TRUE;
          mysql->status= MYSQL_STATUS_READY;
        }
      }
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      if (flags & RESET_SERVER_SIDE)
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      {
        /*
          Reset the server side statement and close the server side
          cursor if it exists.
        */
        char buff[MYSQL_STMT_HEADER]; /* packet header: 4 bytes for stmt id */
        int4store(buff, stmt->stmt_id);
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        if ((*mysql->methods->advanced_command)(mysql, COM_STMT_RESET, buff,
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4982
                                                sizeof(buff), 0, 0, 0, NULL))
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        {
          set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                          mysql->net.sqlstate);
          stmt->state= MYSQL_STMT_INIT_DONE;
          return 1;
        }
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        stmt_clear_error(stmt);
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      }
    }
    stmt->state= MYSQL_STMT_PREPARE_DONE;
  }
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  return 0;
}

my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
{
  DBUG_ENTER("mysql_stmt_free_result");

  /* Free the client side and close the server side cursor if there is one */
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  DBUG_RETURN(reset_stmt_handle(stmt, RESET_LONG_DATA | RESET_STORE_RESULT));
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}

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/********************************************************************
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 statement error handling and close
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*********************************************************************/
5008

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/*
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  Close the statement handle by freeing all alloced resources
5011

5012
  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
*/
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my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
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{
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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);
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    /*
      Clear NET error state: if the following commands come through
      successfully, connection will still be usable for other commands.
    */
    net_clear_error(&mysql->net);
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    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);
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      if ((rc= stmt_command(mysql, COM_STMT_CLOSE, buff, 4, stmt)))
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      {
        set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno,
                        mysql->net.sqlstate);
      }
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    }
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  }
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  my_free((uchar*) stmt, MYF(MY_WME));
5065

5066
  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)
{
  DBUG_ENTER("mysql_stmt_reset");
  DBUG_ASSERT(stmt != 0);
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  if (!stmt->mysql)
  {
    /* mysql can be reset in mysql_close called from mysql_reconnect */
    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
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    DBUG_RETURN(1);
  }
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  /* Reset the client and server sides of the prepared statement */
  DBUG_RETURN(reset_stmt_handle(stmt, RESET_SERVER_SIDE | RESET_LONG_DATA));
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}

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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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}

5113

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

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/*
  Commit the current transaction
*/

5122
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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}

/*
5129
  Rollback the current transaction
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*/

5132
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
*/

5143
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));

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  DBUG_RETURN((my_bool) mysql_real_query(mysql, auto_mode ?
                                         "set autocommit=1":"set autocommit=0",
                                         16));
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}
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/********************************************************************
5155
 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;
5166
  DBUG_ENTER("mysql_more_results");
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  res= ((mysql->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS) ?
5169
	1: 0);
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  DBUG_PRINT("exit",("More results exists ? %d", res));
5171
  DBUG_RETURN(res);
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}

5174

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/*
  Reads and returns the next query results
*/
5178
int STDCALL mysql_next_result(MYSQL *mysql)
5179
{
5180
  DBUG_ENTER("mysql_next_result");
5181

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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)
5196 5197
    DBUG_RETURN((*mysql->methods->next_result)(mysql));

5198
  DBUG_RETURN(-1);				/* No more results */
5199
}
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5200

5201

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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);
}