item_strfunc.cc 64.3 KB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   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 */


/* This file defines all string functions
** Warning: Some string functions doesn't always put and end-null on a String
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** (This shouldn't be needed)
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*/

#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
#include "sql_acl.h"
#include <m_ctype.h>
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#ifdef HAVE_OPENSSL
#include <openssl/des.h>
#endif /* HAVE_OPENSSL */
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#include "md5.h"
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#include "sha1.h"
#include "my_aes.h"
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#include "../mysys/my_static.h"			// For soundex_map
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String my_empty_string("",default_charset_info);
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static void my_coll_agg_error(DTCollation &c1, DTCollation &c2, const char *fname)
{
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  my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
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  	   c1.collation->name,c1.derivation_name(),
	   c2.collation->name,c2.derivation_name(),
	   fname);
}

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uint nr_of_decimals(const char *str)
{
  if ((str=strchr(str,'.')))
  {
    const char *start= ++str;
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    for (; my_isdigit(system_charset_info,*str) ; str++) ;
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    return (uint) (str-start);
  }
  return 0;
}

double Item_str_func::val()
{
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  int err;
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  String *res;
  res=val_str(&str_value);
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  return res ? my_strntod(res->charset(), (char*) res->ptr(),res->length(),
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			  NULL, &err) : 0.0;
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}

longlong Item_str_func::val_int()
{
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  int err;
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  String *res;
  res=val_str(&str_value);
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  return res ? my_strntoll(res->charset(),res->ptr(),res->length(),10,NULL,&err) : (longlong) 0;
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}


String *Item_func_md5::val_str(String *str)
{
  String * sptr= args[0]->val_str(str);
  if (sptr)
  {
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    my_MD5_CTX context;
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    unsigned char digest[16];

    null_value=0;
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    my_MD5Init (&context);
    my_MD5Update (&context,(unsigned char *) sptr->ptr(), sptr->length());
    my_MD5Final (digest, &context);
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    if (str->alloc(32))				// Ensure that memory is free
    {
      null_value=1;
      return 0;
    }
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    sprintf((char *) str->ptr(),
	    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
	    digest[0], digest[1], digest[2], digest[3],
	    digest[4], digest[5], digest[6], digest[7],
	    digest[8], digest[9], digest[10], digest[11],
	    digest[12], digest[13], digest[14], digest[15]);
    str->length((uint) 32);
    return str;
  }
  null_value=1;
  return 0;
}


void Item_func_md5::fix_length_and_dec()
{
   max_length=32;
}

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String *Item_func_sha::val_str(String *str)
{
  String * sptr= args[0]->val_str(str);
  if (sptr)  /* If we got value different from NULL */
  {
    SHA1_CONTEXT context;  /* Context used to generate SHA1 hash */
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    /* Temporary buffer to store 160bit digest */
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    uint8 digest[SHA1_HASH_SIZE];
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    sha1_reset(&context);  /* We do not have to check for error here */
    /* No need to check error as the only case would be too long message */
    sha1_input(&context,(const unsigned char *) sptr->ptr(), sptr->length());
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    /* Ensure that memory is free and we got result */
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    if (!( str->alloc(SHA1_HASH_SIZE*2) || (sha1_result(&context,digest))))
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    {
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      sprintf((char *) str->ptr(),
      "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\
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%02x%02x%02x%02x%02x%02x%02x%02x",
           digest[0], digest[1], digest[2], digest[3],
           digest[4], digest[5], digest[6], digest[7],
           digest[8], digest[9], digest[10], digest[11],
           digest[12], digest[13], digest[14], digest[15],
           digest[16], digest[17], digest[18], digest[19]);
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      str->length((uint)  SHA1_HASH_SIZE*2);
      null_value=0;
      return str;
    }
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  }
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  null_value=1;
  return 0;
}

void Item_func_sha::fix_length_and_dec()
{
   max_length=SHA1_HASH_SIZE*2; // size of hex representation of hash
}
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/* Implementation of AES encryption routines */

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String *Item_func_aes_encrypt::val_str(String *str)
{
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  char key_buff[80];
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  String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
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  String *sptr= args[0]->val_str(str);			// String to encrypt
  String *key=  args[1]->val_str(&tmp_key_value);	// key
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  int aes_length;
  if (sptr && key) // we need both arguments to be not NULL
  {
    null_value=0;
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    aes_length=my_aes_get_size(sptr->length()); // Calculate result length
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    if (!str_value.alloc(aes_length))		// Ensure that memory is free
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    {
      // finally encrypt directly to allocated buffer.
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      if (my_aes_encrypt(sptr->ptr(),sptr->length(), (char*) str_value.ptr(),
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			 key->ptr(), key->length()) == aes_length)
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      {
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	// We got the expected result length
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	str_value.length((uint) aes_length);
	return &str_value;
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      }
    }
  }
  null_value=1;
  return 0;
}

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void Item_func_aes_encrypt::fix_length_and_dec()
{
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  max_length=my_aes_get_size(args[0]->max_length);
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}


String *Item_func_aes_decrypt::val_str(String *str)
{
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  char key_buff[80];
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  String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
  String *sptr, *key;
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  DBUG_ENTER("Item_func_aes_decrypt::val_str");

  sptr= args[0]->val_str(str);			// String to decrypt
  key=  args[1]->val_str(&tmp_key_value);	// Key
  if (sptr && key)  			// Need to have both arguments not NULL
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  {
    null_value=0;
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    if (!str_value.alloc(sptr->length()))  // Ensure that memory is free
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    {
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      // finally decrypt directly to allocated buffer.
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      int length;
      length=my_aes_decrypt(sptr->ptr(), sptr->length(),
			    (char*) str_value.ptr(),
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                            key->ptr(), key->length());
      if (length >= 0)  // if we got correct data data
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      {
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        str_value.length((uint) length);
        DBUG_RETURN(&str_value);
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      }
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    }
  }
  // Bad parameters. No memory or bad data will all go here
  null_value=1;
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  DBUG_RETURN(0);
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}

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void Item_func_aes_decrypt::fix_length_and_dec()
{
   max_length=args[0]->max_length;
}
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/*
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  Concatenate args with the following premises:
  If only one arg (which is ok), return value of arg
  Don't reallocate val_str() if not absolute necessary.
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*/

String *Item_func_concat::val_str(String *str)
{
  String *res,*res2,*use_as_buff;
  uint i;

  null_value=0;
  if (!(res=args[0]->val_str(str)))
    goto null;
  use_as_buff= &tmp_value;
  for (i=1 ; i < arg_count ; i++)
  {
    if (res->length() == 0)
    {
      if (!(res=args[i]->val_str(str)))
	goto null;
    }
    else
    {
      if (!(res2=args[i]->val_str(use_as_buff)))
	goto null;
      if (res2->length() == 0)
	continue;
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      if (res->length()+res2->length() >
	  current_thd->variables.max_allowed_packet)
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	goto null;				// Error check
      if (res->alloced_length() >= res->length()+res2->length())
      {						// Use old buffer
	res->append(*res2);
      }
      else if (str->alloced_length() >= res->length()+res2->length())
      {
	if (str == res2)
	  str->replace(0,0,*res);
	else
	{
	  str->copy(*res);
	  str->append(*res2);
	}
	res=str;
      }
      else if (res == &tmp_value)
      {
	if (res->append(*res2))			// Must be a blob
	  goto null;
      }
      else if (res2 == &tmp_value)
      {						// This can happend only 1 time
	if (tmp_value.replace(0,0,*res))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;			// Put next arg here
      }
      else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() &&
	       res2->ptr() <= tmp_value.ptr() + tmp_value.alloced_length())
      {
	/*
	  This happens really seldom:
	  In this case res2 is sub string of tmp_value.  We will
	  now work in place in tmp_value to set it to res | res2
	*/
	/* Chop the last characters in tmp_value that isn't in res2 */
	tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) +
			 res2->length());
	/* Place res2 at start of tmp_value, remove chars before res2 */
	if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()),
			      *res))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;			// Put next arg here
      }
      else
      {						// Two big const strings
	if (tmp_value.alloc(max_length) ||
	    tmp_value.copy(*res) ||
	    tmp_value.append(*res2))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;
      }
    }
  }
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  res->set_charset(collation.collation);
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  return res;

null:
  null_value=1;
  return 0;
}


void Item_func_concat::fix_length_and_dec()
{
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  bool first_coll= 1;
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  max_length=0;
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  if (agg_arg_collations(collation, args, arg_count))
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    return;

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  for (uint i=0 ; i < arg_count ; i++)
    max_length+=args[i]->max_length;
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  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}

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/*
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  Function des_encrypt() by tonu@spam.ee & monty
  Works only if compiled with OpenSSL library support.
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  This returns a binary string where first character is CHAR(128 | key-number).
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  If one uses a string key key_number is 127.
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  Encryption result is longer than original by formula:
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  new_length= org_length + (8-(org_length % 8))+1
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*/

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String *Item_func_des_encrypt::val_str(String *str)
{
#ifdef HAVE_OPENSSL
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  des_cblock ivec;
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  struct st_des_keyblock keyblock;
  struct st_des_keyschedule keyschedule;
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  const char *append_str="********";
  uint key_number, res_length, tail;
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  String *res= args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
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  if ((res_length=res->length()) == 0)
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    return &my_empty_string;
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  if (arg_count == 1)
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  {
    /* Protect against someone doing FLUSH DES_KEY_FILE */
    VOID(pthread_mutex_lock(&LOCK_des_key_file));
    keyschedule= des_keyschedule[key_number=des_default_key];
    VOID(pthread_mutex_unlock(&LOCK_des_key_file));
  }
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  else if (args[1]->result_type() == INT_RESULT)
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  {
    key_number= (uint) args[1]->val_int();
    if (key_number > 9)
      goto error;
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    VOID(pthread_mutex_lock(&LOCK_des_key_file));
    keyschedule= des_keyschedule[key_number];
    VOID(pthread_mutex_unlock(&LOCK_des_key_file));
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  }
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  else
  {
    String *keystr=args[1]->val_str(&tmp_value);
    if (!keystr)
      goto error;
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    key_number=127;				// User key string
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    /* We make good 24-byte (168 bit) key from given plaintext key with MD5 */
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    bzero((char*) &ivec,sizeof(ivec));
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    EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL,
		   (uchar*) keystr->ptr(), (int) keystr->length(),
		   1, (uchar*) &keyblock,ivec);
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    des_set_key_unchecked(&keyblock.key1,keyschedule.ks1);
    des_set_key_unchecked(&keyblock.key2,keyschedule.ks2);
    des_set_key_unchecked(&keyblock.key3,keyschedule.ks3);
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  }

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  /*
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     The problem: DES algorithm requires original data to be in 8-bytes
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     chunks. Missing bytes get filled with '*'s and result of encryption
     can be up to 8 bytes longer than original string. When decrypted,
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     we do not know the size of original string :(
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     We add one byte with value 0x1..0x8 as the last byte of the padded
     string marking change of string length.
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  */

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  tail=  (8-(res_length) % 8);			// 1..8 marking extra length
  res_length+=tail;
  if (tail && res->append(append_str, tail) || tmp_value.alloc(res_length+1))
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    goto error;
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  (*res)[res_length-1]=tail;			// save extra length
  tmp_value.length(res_length+1);
  tmp_value[0]=(char) (128 | key_number);
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  // Real encryption
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  bzero((char*) &ivec,sizeof(ivec));
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  des_ede3_cbc_encrypt((const uchar*) (res->ptr()),
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		       (uchar*) (tmp_value.ptr()+1),
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		       res_length,
		       keyschedule.ks1,
		       keyschedule.ks2,
		       keyschedule.ks3,
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		       &ivec, TRUE);
  return &tmp_value;

error:
#endif	/* HAVE_OPENSSL */
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  null_value=1;
  return 0;
}

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String *Item_func_des_decrypt::val_str(String *str)
{
#ifdef HAVE_OPENSSL
  des_key_schedule ks1, ks2, ks3;
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  des_cblock ivec;
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  struct st_des_keyblock keyblock;
  struct st_des_keyschedule keyschedule;
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  String *res= args[0]->val_str(str);
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  uint length=res->length(),tail;
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  if ((null_value=args[0]->null_value))
    return 0;
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  length=res->length();
  if (length < 9 || (length % 8) != 1 || !((*res)[0] & 128))
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    return res;				// Skip decryption if not encrypted
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  if (arg_count == 1)			// If automatic uncompression
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  {
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    uint key_number=(uint) (*res)[0] & 127;
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    // Check if automatic key and that we have privilege to uncompress using it
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    if (!(current_thd->master_access & SUPER_ACL) || key_number > 9)
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      goto error;
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    VOID(pthread_mutex_lock(&LOCK_des_key_file));
    keyschedule= des_keyschedule[key_number];
    VOID(pthread_mutex_unlock(&LOCK_des_key_file));
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  }
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  else
  {
    // We make good 24-byte (168 bit) key from given plaintext key with MD5
    String *keystr=args[1]->val_str(&tmp_value);
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    if (!keystr)
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      goto error;
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    bzero((char*) &ivec,sizeof(ivec));
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    EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL,
		   (uchar*) keystr->ptr(),(int) keystr->length(),
		   1,(uchar*) &keyblock,ivec);
    // Here we set all 64-bit keys (56 effective) one by one
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    des_set_key_unchecked(&keyblock.key1,keyschedule.ks1);
    des_set_key_unchecked(&keyblock.key2,keyschedule.ks2);
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    des_set_key_unchecked(&keyblock.key3,keyschedule.ks3);
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  }
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  if (tmp_value.alloc(length-1))
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    goto error;
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  bzero((char*) &ivec,sizeof(ivec));
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  des_ede3_cbc_encrypt((const uchar*) res->ptr()+1,
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		       (uchar*) (tmp_value.ptr()),
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		       length-1,
		       keyschedule.ks1,
		       keyschedule.ks2,
		       keyschedule.ks3,
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		       &ivec, FALSE);
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  /* Restore old length of key */
  if ((tail=(uint) (uchar) tmp_value[length-2]) > 8)
    goto error;					// Wrong key
  tmp_value.length(length-1-tail);
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  return &tmp_value;

error:
#endif	/* HAVE_OPENSSL */
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  null_value=1;
  return 0;
}


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/*
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  concat with separator. First arg is the separator
  concat_ws takes at least two arguments.
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*/

String *Item_func_concat_ws::val_str(String *str)
{
  char tmp_str_buff[10];
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  String tmp_sep_str(tmp_str_buff, sizeof(tmp_str_buff),default_charset_info),
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         *sep_str, *res, *res2,*use_as_buff;
  uint i;

  null_value=0;
  if (!(sep_str= separator->val_str(&tmp_sep_str)))
    goto null;

  use_as_buff= &tmp_value;
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  str->length(0);				// QQ; Should be removed
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  res=str;

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  // Skip until non-null argument is found.
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  // If not, return the empty string
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  for (i=0; i < arg_count; i++)
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    if ((res= args[i]->val_str(str)))
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      break;
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  if (i ==  arg_count)
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    return &my_empty_string;
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  for (i++; i < arg_count ; i++)
  {
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    if (!(res2= args[i]->val_str(use_as_buff)))
      continue;					// Skip NULL
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    if (res->length() + sep_str->length() + res2->length() >
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	current_thd->variables.max_allowed_packet)
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      goto null;				// Error check
    if (res->alloced_length() >=
	res->length() + sep_str->length() + res2->length())
    {						// Use old buffer
      res->append(*sep_str);			// res->length() > 0 always
      res->append(*res2);
    }
    else if (str->alloced_length() >=
	     res->length() + sep_str->length() + res2->length())
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    {
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      /* We have room in str;  We can't get any errors here */
      if (str == res2)
      {						// This is quote uncommon!
	str->replace(0,0,*sep_str);
	str->replace(0,0,*res);
      }
      else
      {
	str->copy(*res);
	str->append(*sep_str);
	str->append(*res2);
      }
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      res=str;
      use_as_buff= &tmp_value;
    }
    else if (res == &tmp_value)
    {
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      if (res->append(*sep_str) || res->append(*res2))
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	goto null; // Must be a blob
    }
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    else if (res2 == &tmp_value)
    {						// This can happend only 1 time
      if (tmp_value.replace(0,0,*sep_str) || tmp_value.replace(0,0,*res))
	goto null;
      res= &tmp_value;
      use_as_buff=str;				// Put next arg here
    }
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    else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() &&
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	     res2->ptr() < tmp_value.ptr() + tmp_value.alloced_length())
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    {
      /*
	This happens really seldom:
	In this case res2 is sub string of tmp_value.  We will
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	now work in place in tmp_value to set it to res | sep_str | res2
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      */
      /* Chop the last characters in tmp_value that isn't in res2 */
      tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) +
		       res2->length());
      /* Place res2 at start of tmp_value, remove chars before res2 */
      if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()),
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			    *res) ||
	  tmp_value.replace(res->length(),0, *sep_str))
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	goto null;
      res= &tmp_value;
      use_as_buff=str;			// Put next arg here
    }
    else
    {						// Two big const strings
      if (tmp_value.alloc(max_length) ||
	  tmp_value.copy(*res) ||
	  tmp_value.append(*sep_str) ||
	  tmp_value.append(*res2))
	goto null;
      res= &tmp_value;
      use_as_buff=str;
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    }
  }
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  res->set_charset(collation.collation);
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  return res;

null:
  null_value=1;
  return 0;
}

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void Item_func_concat_ws::split_sum_func(Item **ref_pointer_array,
					 List<Item> &fields)
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{
  if (separator->with_sum_func && separator->type() != SUM_FUNC_ITEM)
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    separator->split_sum_func(ref_pointer_array, fields);
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  else if (separator->used_tables() || separator->type() == SUM_FUNC_ITEM)
  {
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    uint el= fields.elements;
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    fields.push_front(separator);
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    ref_pointer_array[el]= separator;
    separator= new Item_ref(ref_pointer_array + el, 0, separator->name);
  }
  Item_str_func::split_sum_func(ref_pointer_array, fields);
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}
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void Item_func_concat_ws::fix_length_and_dec()
{
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  collation.set(separator->collation);
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  max_length=separator->max_length*(arg_count-1);
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    max_length+=args[i]->max_length;
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    if (collation.aggregate(args[i]->collation))
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    {
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      my_coll_agg_error(collation, args[i]->collation, func_name());
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      break;
    }
  }
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  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
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  used_tables_cache|=     separator->used_tables();
  not_null_tables_cache&= separator->not_null_tables();
  const_item_cache&=	  separator->const_item();
  with_sum_func=	  with_sum_func || separator->with_sum_func;
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}

void Item_func_concat_ws::update_used_tables()
{
  Item_func::update_used_tables();
  separator->update_used_tables();
  used_tables_cache|=separator->used_tables();
  const_item_cache&=separator->const_item();
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}


String *Item_func_reverse::val_str(String *str)
{
  String *res = args[0]->val_str(str);
  char *ptr,*end;

  if ((null_value=args[0]->null_value))
    return 0;
  /* An empty string is a special case as the string pointer may be null */
  if (!res->length())
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    return &my_empty_string;
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  res=copy_if_not_alloced(str,res,res->length());
  ptr = (char *) res->ptr();
  end=ptr+res->length();
#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    String tmpstr;
    tmpstr.copy(*res);
    char *tmp = (char *) tmpstr.ptr() + tmpstr.length();
    register uint32 l;
    while (ptr < end)
    {
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      if ((l=my_ismbchar(res->charset(), ptr,end)))
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        tmp-=l, memcpy(tmp,ptr,l), ptr+=l;
      else
        *--tmp=*ptr++;
    }
    memcpy((char *) res->ptr(),(char *) tmpstr.ptr(), res->length());
  }
  else
#endif /* USE_MB */
  {
    char tmp;
    while (ptr < end)
    {
      tmp=*ptr;
      *ptr++=*--end;
      *end=tmp;
    }
  }
  return res;
}


void Item_func_reverse::fix_length_and_dec()
{
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  collation.set(args[0]->collation);
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  max_length = args[0]->max_length;
}

/*
** Replace all occurences of string2 in string1 with string3.
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** Don't reallocate val_str() if not needed
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*/

/* TODO: Fix that this works with binary strings when using USE_MB */

String *Item_func_replace::val_str(String *str)
{
  String *res,*res2,*res3;
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  int offset;
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  uint from_length,to_length;
  bool alloced=0;
#ifdef USE_MB
  const char *ptr,*end,*strend,*search,*search_end;
  register uint32 l;
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  bool binary_cmp;
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#endif

  null_value=0;
  res=args[0]->val_str(str);
  if (args[0]->null_value)
    goto null;
  res2=args[1]->val_str(&tmp_value);
  if (args[1]->null_value)
    goto null;

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  res->set_charset(collation.collation);

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#ifdef USE_MB
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  binary_cmp = ((res->charset()->state & MY_CS_BINSORT) || !use_mb(res->charset()));
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#endif

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  if (res2->length() == 0)
    return res;
#ifndef USE_MB
  if ((offset=res->strstr(*res2)) < 0)
    return res;
#else
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  offset=0;
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  if (binary_cmp && (offset=res->strstr(*res2)) < 0)
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    return res;
#endif
  if (!(res3=args[2]->val_str(&tmp_value2)))
    goto null;
  from_length= res2->length();
  to_length=   res3->length();

#ifdef USE_MB
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  if (!binary_cmp)
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  {
    search=res2->ptr();
    search_end=search+from_length;
redo:
    ptr=res->ptr()+offset;
    strend=res->ptr()+res->length();
    end=strend-from_length+1;
    while (ptr < end)
    {
        if (*ptr == *search)
        {
          register char *i,*j;
          i=(char*) ptr+1; j=(char*) search+1;
          while (j != search_end)
            if (*i++ != *j++) goto skipp;
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          offset= (int) (ptr-res->ptr());
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          if (res->length()-from_length + to_length >
	      current_thd->variables.max_allowed_packet)
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            goto null;
          if (!alloced)
          {
            alloced=1;
            res=copy_if_not_alloced(str,res,res->length()+to_length);
          }
          res->replace((uint) offset,from_length,*res3);
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	  offset+=(int) to_length;
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          goto redo;
        }
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        if ((l=my_ismbchar(res->charset(), ptr,strend))) ptr+=l;
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        else ++ptr;
    }
  }
  else
#endif /* USE_MB */
    do
    {
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      if (res->length()-from_length + to_length >
	  current_thd->variables.max_allowed_packet)
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        goto null;
      if (!alloced)
      {
        alloced=1;
        res=copy_if_not_alloced(str,res,res->length()+to_length);
      }
      res->replace((uint) offset,from_length,*res3);
      offset+=(int) to_length;
    }
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    while ((offset=res->strstr(*res2,(uint) offset)) >= 0);
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  return res;

null:
  null_value=1;
  return 0;
}


void Item_func_replace::fix_length_and_dec()
{
  max_length=args[0]->max_length;
  int diff=(int) (args[2]->max_length - args[1]->max_length);
  if (diff > 0 && args[1]->max_length)
  {						// Calculate of maxreplaces
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    uint max_substrs= max_length/args[1]->max_length;
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    max_length+= max_substrs * (uint) diff;
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  }
  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
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  if (agg_arg_collations_for_comparison(collation, args, 3))
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    return;
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}


String *Item_func_insert::val_str(String *str)
{
  String *res,*res2;
  uint start,length;

  null_value=0;
  res=args[0]->val_str(str);
  res2=args[3]->val_str(&tmp_value);
  start=(uint) args[1]->val_int()-1;
  length=(uint) args[2]->val_int();
  if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
      args[3]->null_value)
    goto null; /* purecov: inspected */
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  start=res->charpos(start);
  length=res->charpos(length,start);
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  if (start > res->length()+1)
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    return res;					// Wrong param; skip insert
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  if (length > res->length()-start)
    length=res->length()-start;
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  if (res->length() - length + res2->length() >
      current_thd->variables.max_allowed_packet)
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    goto null;					// OOM check
  res=copy_if_not_alloced(str,res,res->length());
  res->replace(start,length,*res2);
  return res;
null:
  null_value=1;
  return 0;
}


void Item_func_insert::fix_length_and_dec()
{
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  if (collation.set(args[0]->collation, args[3]->collation))
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  {
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      my_coll_agg_error(args[0]->collation, args[3]->collation, func_name());
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      return;
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  }
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  max_length=args[0]->max_length+args[3]->max_length;
  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


String *Item_func_lcase::val_str(String *str)
{
  String *res;
  if (!(res=args[0]->val_str(str)))
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  null_value=0;
  res=copy_if_not_alloced(str,res,res->length());
  res->casedn();
  return res;
}


String *Item_func_ucase::val_str(String *str)
{
  String *res;
  if (!(res=args[0]->val_str(str)))
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  null_value=0;
  res=copy_if_not_alloced(str,res,res->length());
  res->caseup();
  return res;
}


String *Item_func_left::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  long length  =(long) args[1]->val_int();

  if ((null_value=args[0]->null_value))
    return 0;
  if (length <= 0)
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    return &my_empty_string;
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  length= res->charpos(length);
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  if (res->length() > (ulong) length)
  {						// Safe even if const arg
    if (!res->alloced_length())
    {						// Don't change const str
      str_value= *res;				// Not malloced string
      res= &str_value;
    }
    res->length((uint) length);
  }
  return res;
}


void Item_str_func::left_right_max_length()
{
  max_length=args[0]->max_length;
  if (args[1]->const_item())
  {
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    int length=(int) args[1]->val_int()*collation.collation->mbmaxlen;
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    if (length <= 0)
      max_length=0;
    else
      set_if_smaller(max_length,(uint) length);
  }
}


void Item_func_left::fix_length_and_dec()
{
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  collation.set(args[0]->collation);
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  left_right_max_length();
}


String *Item_func_right::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  long length  =(long) args[1]->val_int();

  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */
  if (length <= 0)
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    return &my_empty_string; /* purecov: inspected */
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  if (res->length() <= (uint) length)
    return res; /* purecov: inspected */
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  uint start=res->numchars()-(uint) length;
  if (start<=0) return res;
  start=res->charpos(start);
  tmp_value.set(*res,start,res->length()-start);
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  return &tmp_value;
}


void Item_func_right::fix_length_and_dec()
{
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  collation.set(args[0]->collation);
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  left_right_max_length();
}


String *Item_func_substr::val_str(String *str)
{
  String *res  = args[0]->val_str(str);
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  int32 start	= (int32) args[1]->val_int();
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  int32 length	= arg_count == 3 ? (int32) args[2]->val_int() : INT_MAX32;
  int32 tmp_length;

  if ((null_value=(args[0]->null_value || args[1]->null_value ||
		   (arg_count == 3 && args[2]->null_value))))
    return 0; /* purecov: inspected */
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  start= (int32)((start < 0) ? res->length() + start : start -1);
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  start=res->charpos(start);
  length=res->charpos(length,start);
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  if (start < 0 || (uint) start+1 > res->length() || length <= 0)
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    return &my_empty_string;
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  tmp_length=(int32) res->length()-start;
  length=min(length,tmp_length);

  if (!start && res->length() == (uint) length)
    return res;
  tmp_value.set(*res,(uint) start,(uint) length);
  return &tmp_value;
}


void Item_func_substr::fix_length_and_dec()
{
  max_length=args[0]->max_length;

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  collation.set(args[0]->collation);
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  if (args[1]->const_item())
  {
    int32 start=(int32) args[1]->val_int()-1;
    if (start < 0 || start >= (int32) max_length)
      max_length=0; /* purecov: inspected */
    else
      max_length-= (uint) start;
  }
  if (arg_count == 3 && args[2]->const_item())
  {
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    int32 length= (int32) args[2]->val_int() * default_charset_info->mbmaxlen;
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    if (length <= 0)
      max_length=0; /* purecov: inspected */
    else
      set_if_smaller(max_length,(uint) length);
  }
}


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void Item_func_substr_index::fix_length_and_dec()
{ 
  max_length= args[0]->max_length;
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  if (agg_arg_collations_for_comparison(collation, args, 2))
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    return;
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}


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String *Item_func_substr_index::val_str(String *str)
{
  String *res =args[0]->val_str(str);
  String *delimeter =args[1]->val_str(&tmp_value);
  int32 count = (int32) args[2]->val_int();
  uint offset;

  if (args[0]->null_value || args[1]->null_value || args[2]->null_value)
  {					// string and/or delim are null
    null_value=1;
    return 0;
  }
  null_value=0;
  uint delimeter_length=delimeter->length();
  if (!res->length() || !delimeter_length || !count)
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    return &my_empty_string;		// Wrong parameters
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  res->set_charset(collation.collation);

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#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    const char *ptr=res->ptr();
    const char *strend = ptr+res->length();
    const char *end=strend-delimeter_length+1;
    const char *search=delimeter->ptr();
    const char *search_end=search+delimeter_length;
    int32 n=0,c=count,pass;
    register uint32 l;
    for (pass=(count>0);pass<2;++pass)
    {
      while (ptr < end)
      {
        if (*ptr == *search)
        {
	  register char *i,*j;
	  i=(char*) ptr+1; j=(char*) search+1;
	  while (j != search_end)
	    if (*i++ != *j++) goto skipp;
	  if (pass==0) ++n;
	  else if (!--c) break;
	  ptr+=delimeter_length;
	  continue;
	}
    skipp:
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        if ((l=my_ismbchar(res->charset(), ptr,strend))) ptr+=l;
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        else ++ptr;
      } /* either not found or got total number when count<0 */
      if (pass == 0) /* count<0 */
      {
        c+=n+1;
        if (c<=0) return res; /* not found, return original string */
        ptr=res->ptr();
      }
      else
      {
        if (c) return res; /* Not found, return original string */
        if (count>0) /* return left part */
        {
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	  tmp_value.set(*res,0,(ulong) (ptr-res->ptr()));
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        }
        else /* return right part */
        {
	  ptr+=delimeter_length;
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	  tmp_value.set(*res,(ulong) (ptr-res->ptr()), (ulong) (strend-ptr));
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        }
      }
    }
  }
  else
#endif /* USE_MB */
  {
    if (count > 0)
    {					// start counting from the beginning
      for (offset=0 ;; offset+=delimeter_length)
      {
	if ((int) (offset=res->strstr(*delimeter,offset)) < 0)
	  return res;			// Didn't find, return org string
	if (!--count)
	{
	  tmp_value.set(*res,0,offset);
	  break;
	}
      }
    }
    else
    {					// Start counting at end
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      for (offset=res->length() ; ; offset-=delimeter_length-1)
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      {
	if ((int) (offset=res->strrstr(*delimeter,offset)) < 0)
	  return res;			// Didn't find, return org string
	if (!++count)
	{
	  offset+=delimeter_length;
	  tmp_value.set(*res,offset,res->length()- offset);
	  break;
	}
      }
    }
  }
  return (&tmp_value);
}

/*
** The trim functions are extension to ANSI SQL because they trim substrings
** They ltrim() and rtrim() functions are optimized for 1 byte strings
** They also return the original string if possible, else they return
** a substring that points at the original string.
*/


String *Item_func_ltrim::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;					/* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

  if (!remove_str || (remove_length=remove_str->length()) == 0 ||
      remove_length > res->length())
    return res;

  char *ptr=(char*) res->ptr();
  char *end=ptr+res->length();
  if (remove_length == 1)
  {
    char chr=(*remove_str)[0];
    while (ptr != end && *ptr == chr)
      ptr++;
  }
  else
  {
    const char *r_ptr=remove_str->ptr();
    end-=remove_length;
    while (ptr < end && !memcmp(ptr,r_ptr,remove_length))
      ptr+=remove_length;
    end+=remove_length;
  }
  if (ptr == res->ptr())
    return res;
  tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr));
  return &tmp_value;
}


String *Item_func_rtrim::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

  if (!remove_str || (remove_length=remove_str->length()) == 0 ||
      remove_length > res->length())
    return res;

  char *ptr=(char*) res->ptr();
  char *end=ptr+res->length();
#ifdef USE_MB
  char *p=ptr;
  register uint32 l;
#endif
  if (remove_length == 1)
  {
    char chr=(*remove_str)[0];
#ifdef USE_MB
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    if (use_mb(res->charset()))
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    {
      while (ptr < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l,p=ptr;
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	else ++ptr;
      }
      ptr=p;
    }
#endif
    while (ptr != end  && end[-1] == chr)
      end--;
  }
  else
  {
    const char *r_ptr=remove_str->ptr();
#ifdef USE_MB
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    if (use_mb(res->charset()))
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    {
  loop:
      while (ptr + remove_length < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l;
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	else ++ptr;
      }
      if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
      {
	end-=remove_length;
	ptr=p;
	goto loop;
      }
    }
    else
#endif /* USE_MB */
    {
      while (ptr + remove_length < end &&
	     !memcmp(end-remove_length,r_ptr,remove_length))
	end-=remove_length;
    }
  }
  if (end == res->ptr()+res->length())
    return res;
  tmp_value.set(*res,0,(uint) (end-res->ptr()));
  return &tmp_value;
}


String *Item_func_trim::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;					/* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

  if (!remove_str || (remove_length=remove_str->length()) == 0 ||
      remove_length > res->length())
    return res;

  char *ptr=(char*) res->ptr();
  char *end=ptr+res->length();
  const char *r_ptr=remove_str->ptr();
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  while (ptr+remove_length <= end && !memcmp(ptr,r_ptr,remove_length))
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    ptr+=remove_length;
#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    char *p=ptr;
    register uint32 l;
 loop:
    while (ptr + remove_length < end)
    {
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      if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l;
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      else ++ptr;
    }
    if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
    {
      end-=remove_length;
      ptr=p;
      goto loop;
    }
    ptr=p;
  }
  else
#endif /* USE_MB */
  {
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    while (ptr + remove_length <= end &&
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	   !memcmp(end-remove_length,r_ptr,remove_length))
      end-=remove_length;
  }
  if (ptr == res->ptr() && end == ptr+res->length())
    return res;
  tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr));
  return &tmp_value;
}

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void Item_func_trim::fix_length_and_dec()
{
  max_length= args[0]->max_length;
  if (arg_count == 1)
  {
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    collation.set(args[0]->collation);
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    remove.set_charset(collation.collation);
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    remove.set_ascii(" ",1);
  }
  else
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  if (collation.set(args[1]->collation, args[0]->collation) ||
      collation.derivation == DERIVATION_NONE)
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  {
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    my_coll_agg_error(args[1]->collation, args[0]->collation, func_name());
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  }
}


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/* Item_func_password */
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String *Item_func_password::val_str(String *str)
{
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  String *res= args[0]->val_str(str); 
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  if ((null_value=args[0]->null_value))
    return 0;
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  if (res->length() == 0)
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    return &my_empty_string;
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  make_scrambled_password(tmp_value, res->c_ptr());
  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH, res->charset());
  return str;
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}

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char *Item_func_password::alloc(THD *thd, const char *password)
{
  char *buff= (char *) thd->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH+1);
  if (buff)
    make_scrambled_password(buff, password);
  return buff;
}

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/* Item_func_old_password */

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String *Item_func_old_password::val_str(String *str)
{
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  String *res= args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
  if (res->length() == 0)
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    return &my_empty_string;
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  make_scrambled_password_323(tmp_value, res->c_ptr());
  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH_323, res->charset());
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  return str;
}

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char *Item_func_old_password::alloc(THD *thd, const char *password)
{
  char *buff= (char *) thd->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1);
  if (buff)
    make_scrambled_password_323(buff, password);
  return buff;
}
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#define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.')
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String *Item_func_encrypt::val_str(String *str)
{
  String *res  =args[0]->val_str(str);

#ifdef HAVE_CRYPT
  char salt[3],*salt_ptr;
  if ((null_value=args[0]->null_value))
    return 0;
  if (res->length() == 0)
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    return &my_empty_string;
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  if (arg_count == 1)
  {					// generate random salt
    time_t timestamp=current_thd->query_start();
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    salt[0] = bin_to_ascii( (ulong) timestamp & 0x3f);
    salt[1] = bin_to_ascii(( (ulong) timestamp >> 5) & 0x3f);
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    salt[2] = 0;
    salt_ptr=salt;
  }
  else
  {					// obtain salt from the first two bytes
    String *salt_str=args[1]->val_str(&tmp_value);
    if ((null_value= (args[1]->null_value || salt_str->length() < 2)))
      return 0;
    salt_ptr= salt_str->c_ptr();
  }
  pthread_mutex_lock(&LOCK_crypt);
  char *tmp=crypt(res->c_ptr(),salt_ptr);
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  str->set(tmp,(uint) strlen(tmp),res->charset());
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  str->copy();
  pthread_mutex_unlock(&LOCK_crypt);
  return str;
#else
  null_value=1;
  return 0;
#endif	/* HAVE_CRYPT */
}

void Item_func_encode::fix_length_and_dec()
{
  max_length=args[0]->max_length;
  maybe_null=args[0]->maybe_null;
}

String *Item_func_encode::val_str(String *str)
{
  String *res;
  if (!(res=args[0]->val_str(str)))
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  null_value=0;
  res=copy_if_not_alloced(str,res,res->length());
  sql_crypt.init();
  sql_crypt.encode((char*) res->ptr(),res->length());
  return res;
}

String *Item_func_decode::val_str(String *str)
{
  String *res;
  if (!(res=args[0]->val_str(str)))
  {
    null_value=1; /* purecov: inspected */
    return 0; /* purecov: inspected */
  }
  null_value=0;
  res=copy_if_not_alloced(str,res,res->length());
  sql_crypt.init();
  sql_crypt.decode((char*) res->ptr(),res->length());
  return res;
}


String *Item_func_database::val_str(String *str)
{
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  THD *thd= current_thd;
  if (!thd->db)
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  {
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    null_value= 1;
    return 0;
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  }
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  else
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    str->copy((const char*) thd->db,(uint) strlen(thd->db),system_charset_info);
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  return str;
}

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// TODO: make USER() replicate properly (currently it is replicated to "")

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String *Item_func_user::val_str(String *str)
{
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  THD          *thd=current_thd;
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  CHARSET_INFO *cs= system_charset_info;
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  const char   *host= thd->host_or_ip;
  uint		res_length;

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  // For system threads (e.g. replication SQL thread) user may be empty
  if (!thd->user)
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    return &my_empty_string;
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  res_length= (strlen(thd->user)+strlen(host)+2) * cs->mbmaxlen;
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  if (str->alloc(res_length))
  {
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    null_value=1;
    return 0;
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  }
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  res_length=cs->cset->snprintf(cs, (char*)str->ptr(), res_length, "%s@%s",
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			  thd->user, host);
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  str->length(res_length);
  str->set_charset(cs);
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  return str;
}

void Item_func_soundex::fix_length_and_dec()
{
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  collation.set(args[0]->collation);
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  max_length=args[0]->max_length;
  set_if_bigger(max_length,4);
}


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/*
  If alpha, map input letter to soundex code.
  If not alpha and remove_garbage is set then skip to next char
  else return 0
*/
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static char get_scode(CHARSET_INFO *cs,char *ptr)
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{
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  uchar ch=my_toupper(cs,*ptr);
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  if (ch < 'A' || ch > 'Z')
  {
					// Thread extended alfa (country spec)
    return '0';				// as vokal
  }
  return(soundex_map[ch-'A']);
}


String *Item_func_soundex::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  char last_ch,ch;
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  CHARSET_INFO *cs= collation.collation;
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  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */

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  if (tmp_value.alloc(max(res->length(),4)))
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    return str; /* purecov: inspected */
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  char *to= (char *) tmp_value.ptr();
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  char *from= (char *) res->ptr(), *end=from+res->length();
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  tmp_value.set_charset(cs);
  
  while (from != end && my_isspace(cs,*from)) // Skip pre-space
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    from++; /* purecov: inspected */
  if (from == end)
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    return &my_empty_string;		// No alpha characters.
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  *to++ = my_toupper(cs,*from);		// Copy first letter
  last_ch = get_scode(cs,from);		// code of the first letter
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					// for the first 'double-letter check.
					// Loop on input letters until
					// end of input (null) or output
					// letter code count = 3
  for (from++ ; from < end ; from++)
  {
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    if (!my_isalpha(cs,*from))
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      continue;
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    ch=get_scode(cs,from);
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    if ((ch != '0') && (ch != last_ch)) // if not skipped or double
    {
       *to++ = ch;			// letter, copy to output
       last_ch = ch;			// save code of last input letter
    }					// for next double-letter check
  }
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  for (end=(char*) tmp_value.ptr()+4 ; to < end ; to++)
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    *to = '0';
  *to=0;				// end string
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  tmp_value.length((uint) (to-tmp_value.ptr()));
  return &tmp_value;
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}


/*
** Change a number to format '3,333,333,333.000'
** This should be 'internationalized' sometimes.
*/

Item_func_format::Item_func_format(Item *org,int dec) :Item_str_func(org)
{
  decimals=(uint) set_zone(dec,0,30);
}


String *Item_func_format::val_str(String *str)
{
  double nr	=args[0]->val();
  uint32 diff,length,str_length;
  uint dec;
  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */
  dec= decimals ? decimals+1 : 0;
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  str->set(nr,decimals,default_charset());
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#ifdef HAVE_ISNAN
  if (isnan(nr))
    return str;
#endif
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  str_length=str->length();
  if (nr < 0)
    str_length--;				// Don't count sign
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  /* We need this test to handle 'nan' values */
  if (str_length >= dec+4)
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  {
    char *tmp,*pos;
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    length= str->length()+(diff=(str_length- dec-1)/3);
    str= copy_if_not_alloced(&tmp_str,str,length);
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    str->length(length);
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    tmp= (char*) str->ptr()+length - dec-1;
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    for (pos= (char*) str->ptr()+length-1; pos != tmp; pos--)
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      pos[0]= pos[-(int) diff];
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    while (diff)
    {
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=',';
      pos--;
      diff--;
    }
  }
  return str;
}


void Item_func_elt::fix_length_and_dec()
{
  max_length=0;
  decimals=0;
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  if (agg_arg_collations(collation, args+1, arg_count-1))
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    return;

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  for (uint i=1 ; i < arg_count ; i++)
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  {
    set_if_bigger(max_length,args[i]->max_length);
    set_if_bigger(decimals,args[i]->decimals);
  }
  maybe_null=1;					// NULL if wrong first arg
}


double Item_func_elt::val()
{
  uint tmp;
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  null_value=1;
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  if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count)
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    return 0.0;
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  double result= args[tmp]->val();
  null_value= args[tmp]->null_value;
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  return result;
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}

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longlong Item_func_elt::val_int()
{
  uint tmp;
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  null_value=1;
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  if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count)
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    return 0;
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  longlong result= args[tmp]->val_int();
  null_value= args[tmp]->null_value;
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  return result;
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}

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String *Item_func_elt::val_str(String *str)
{
  uint tmp;
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  null_value=1;
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  if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count)
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    return NULL;
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  String *result= args[tmp]->val_str(str);
  if (result)
    result->set_charset(collation.collation);
  null_value= args[tmp]->null_value;
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  return result;
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}


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void Item_func_make_set::split_sum_func(Item **ref_pointer_array,
					List<Item> &fields)
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{
  if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
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    item->split_sum_func(ref_pointer_array, fields);
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  else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
  {
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    uint el= fields.elements;
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    fields.push_front(item);
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    ref_pointer_array[el]= item;
    item= new Item_ref(ref_pointer_array + el, 0, item->name);
  }
  Item_str_func::split_sum_func(ref_pointer_array, fields);
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}


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void Item_func_make_set::fix_length_and_dec()
{
  max_length=arg_count-1;
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  if (agg_arg_collations(collation, args, arg_count))
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    return;
  
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  for (uint i=0 ; i < arg_count ; i++)
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    max_length+=args[i]->max_length;
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  used_tables_cache|=	  item->used_tables();
  not_null_tables_cache&= item->not_null_tables();
  const_item_cache&=	  item->const_item();
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  with_sum_func= with_sum_func || item->with_sum_func;
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}


void Item_func_make_set::update_used_tables()
{
  Item_func::update_used_tables();
  item->update_used_tables();
  used_tables_cache|=item->used_tables();
  const_item_cache&=item->const_item();
}


String *Item_func_make_set::val_str(String *str)
{
  ulonglong bits;
  bool first_found=0;
  Item **ptr=args;
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  String *result=&my_empty_string;
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  bits=item->val_int();
  if ((null_value=item->null_value))
    return NULL;

  if (arg_count < 64)
    bits &= ((ulonglong) 1 << arg_count)-1;

  for (; bits; bits >>= 1, ptr++)
  {
    if (bits & 1)
    {
      String *res= (*ptr)->val_str(str);
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      if (res)					// Skip nulls
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      {
	if (!first_found)
	{					// First argument
	  first_found=1;
	  if (res != str)
	    result=res;				// Use original string
	  else
	  {
	    if (tmp_str.copy(*res))		// Don't use 'str'
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	      return &my_empty_string;
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	    result= &tmp_str;
	  }
	}
	else
	{
	  if (result != &tmp_str)
	  {					// Copy data to tmp_str
	    if (tmp_str.alloc(result->length()+res->length()+1) ||
		tmp_str.copy(*result))
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	      return &my_empty_string;
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	    result= &tmp_str;
	  }
	  if (tmp_str.append(',') || tmp_str.append(*res))
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	    return &my_empty_string;
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	}
      }
    }
  }
  return result;
}


String *Item_func_char::val_str(String *str)
{
  str->length(0);
  for (uint i=0 ; i < arg_count ; i++)
  {
    int32 num=(int32) args[i]->val_int();
    if (!args[i]->null_value)
#ifdef USE_MB
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      if (use_mb(collation.collation))
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      {
        if (num&0xFF000000L) {
           str->append((char)(num>>24));
           goto b2;
        } else if (num&0xFF0000L) {
b2:        str->append((char)(num>>16));
           goto b1;
1781
        } else if (num&0xFF00L) {
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b1:        str->append((char)(num>>8));
        }
      }
#endif
      str->append((char)num);
  }
  str->realloc(str->length());			// Add end 0 (for Purify)
  return str;
}


inline String* alloc_buffer(String *res,String *str,String *tmp_value,
			    ulong length)
{
  if (res->alloced_length() < length)
  {
    if (str->alloced_length() >= length)
    {
      (void) str->copy(*res);
      str->length(length);
      return str;
    }
    else
    {
      if (tmp_value->alloc(length))
	return 0;
      (void) tmp_value->copy(*res);
      tmp_value->length(length);
      return tmp_value;
    }
  }
  res->length(length);
  return res;
}


void Item_func_repeat::fix_length_and_dec()
{
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  collation.set(args[0]->collation);
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  if (args[1]->const_item())
  {
    max_length=(long) (args[0]->max_length * args[1]->val_int());
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}

/*
** Item_func_repeat::str is carefully written to avoid reallocs
** as much as possible at the cost of a local buffer
*/

String *Item_func_repeat::val_str(String *str)
{
  uint length,tot_length;
  char *to;
  long count= (long) args[1]->val_int();
  String *res =args[0]->val_str(str);

  if (args[0]->null_value || args[1]->null_value)
    goto err;				// string and/or delim are null
  null_value=0;
  if (count <= 0)			// For nicer SQL code
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    return &my_empty_string;
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  if (count == 1)			// To avoid reallocs
    return res;
  length=res->length();
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  // Safe length check
  if (length > current_thd->variables.max_allowed_packet/count)
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    goto err;				// Probably an error
  tot_length= length*(uint) count;
  if (!(res= alloc_buffer(res,str,&tmp_value,tot_length)))
    goto err;

  to=(char*) res->ptr()+length;
  while (--count)
  {
    memcpy(to,res->ptr(),length);
    to+=length;
  }
  return (res);

err:
  null_value=1;
  return 0;
}


void Item_func_rpad::fix_length_and_dec()
{
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  if (collation.set(args[0]->collation, args[2]->collation))
1881
  {
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    my_coll_agg_error(args[0]->collation, args[2]->collation, func_name());
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    return;
1884 1885
  }
  
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  if (args[1]->const_item())
  {
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    uint32 length= (uint32) args[1]->val_int() * collation.collation->mbmaxlen;
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    max_length=max(args[0]->max_length,length);
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


String *Item_func_rpad::val_str(String *str)
{
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  uint32 res_byte_length,res_char_length,pad_char_length,pad_byte_length;
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  char *to;
  const char *ptr_pad;
  int32 count= (int32) args[1]->val_int();
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  int32 byte_count= count * collation.collation->mbmaxlen;
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  String *res =args[0]->val_str(str);
  String *rpad = args[2]->val_str(str);

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  if (!res || args[1]->null_value || !rpad || count < 0)
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    goto err;
  null_value=0;
1917
  if (count <= (int32) (res_char_length=res->numchars()))
1918
  {						// String to pad is big enough
1919
    res->length(res->charpos(count));		// Shorten result if longer
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    return (res);
  }
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  pad_char_length= rpad->numchars();
  if ((ulong) byte_count > current_thd->variables.max_allowed_packet ||
      args[2]->null_value || !pad_char_length)
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    goto err;
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  res_byte_length= res->length();	/* Must be done before alloc_buffer */
  if (!(res= alloc_buffer(res,str,&tmp_value,byte_count)))
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    goto err;

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  to= (char*) res->ptr()+res_byte_length;
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  ptr_pad=rpad->ptr();
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  pad_byte_length= rpad->length();
  count-= res_char_length;
  for ( ; (uint32) count > pad_char_length; count-= pad_char_length)
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  {
1936 1937
    memcpy(to,ptr_pad,pad_byte_length);
    to+= pad_byte_length;
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  }
1939 1940 1941 1942 1943 1944 1945
  if (count)
  {
    pad_byte_length= rpad->charpos(count);
    memcpy(to,ptr_pad,(size_t) pad_byte_length);
    to+= pad_byte_length;
  }
  res->length(to- (char*) res->ptr());
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  return (res);

 err:
  null_value=1;
  return 0;
}


void Item_func_lpad::fix_length_and_dec()
{
1956
  if (collation.set(args[0]->collation, args[2]->collation))
1957
  {
1958
    my_coll_agg_error(args[0]->collation, args[2]->collation, func_name());
1959
    return;
1960 1961
  }
  
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  if (args[1]->const_item())
  {
1964
    uint32 length= (uint32) args[1]->val_int() * collation.collation->mbmaxlen;
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    max_length=max(args[0]->max_length,length);
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


String *Item_func_lpad::val_str(String *str)
{
1982 1983 1984 1985 1986
  uint32 res_byte_length,res_char_length,pad_byte_length,pad_char_length;
  ulong count= (long) args[1]->val_int(), byte_count;
  String a1,a3;
  String *res= args[0]->val_str(&a1);
  String *pad= args[2]->val_str(&a3);
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1988
  if (!res || args[1]->null_value || !pad)
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    goto err;
1990

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  null_value=0;
1992 1993 1994 1995 1996 1997 1998
  res_byte_length= res->length();
  res_char_length= res->numchars();

  if (count <= res_char_length)
  {
    res->length(res->charpos(count));
    return res;
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  }
2000 2001 2002 2003 2004 2005 2006
  
  pad_byte_length= pad->length();
  pad_char_length= pad->numchars();
  byte_count= count * collation.collation->mbmaxlen;
  
  if (byte_count > current_thd->variables.max_allowed_packet ||
      args[2]->null_value || !pad_char_length || str->alloc(byte_count))
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    goto err;
2008 2009 2010 2011 2012
  
  str->length(0);
  str->set_charset(collation.collation);
  count-= res_char_length;
  while (count >= pad_char_length)
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  {
2014 2015
    str->append(*pad);
    count-= pad_char_length;
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  }
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  if (count > 0)
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  {
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    pad->length(pad->charpos(count));
    str->append(*pad);
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  }
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  str->append(*res);
  null_value= 0;
  return str;
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err:
  null_value= 1;
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  return 0;
}


String *Item_func_conv::val_str(String *str)
{
  String *res= args[0]->val_str(str);
  char *endptr,ans[65],*ptr;
  longlong dec;
  int from_base= (int) args[1]->val_int();
  int to_base= (int) args[2]->val_int();
2039
  int err;
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  if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
      abs(to_base) > 36 || abs(to_base) < 2 ||
      abs(from_base) > 36 || abs(from_base) < 2 || !(res->length()))
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  if (from_base < 0)
2050
    dec= my_strntoll(res->charset(),res->ptr(),res->length(),-from_base,&endptr,&err);
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  else
2052
    dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),from_base,&endptr,&err);
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  ptr= longlong2str(dec,ans,to_base);
2054
  if (str->copy(ans,(uint32) (ptr-ans), default_charset()))
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    return &my_empty_string;
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  return str;
}

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2060 2061 2062 2063 2064 2065 2066 2067
String *Item_func_conv_charset::val_str(String *str)
{
  String *arg= args[0]->val_str(str);
  if (!arg)
  {
    null_value=1;
    return 0;
  }
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  null_value= str->copy(arg->ptr(),arg->length(),arg->charset(),conv_charset);
  return null_value ? 0 : str;
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}

void Item_func_conv_charset::fix_length_and_dec()
{
2074
  collation.set(conv_charset, DERIVATION_IMPLICIT);
2075
  max_length = args[0]->max_length*conv_charset->mbmaxlen;
2076 2077
}

2078

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2080 2081 2082 2083 2084 2085
String *Item_func_conv_charset3::val_str(String *str)
{
  my_wc_t wc;
  int cnvres;
  const uchar *s, *se;
  uchar *d, *d0, *de;
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  uint32 dmaxlen;
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  String *arg= args[0]->val_str(str);
  String *to_cs= args[1]->val_str(str);
  String *from_cs= args[2]->val_str(str);
  CHARSET_INFO *from_charset;
  CHARSET_INFO *to_charset;
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  if (!arg     || args[0]->null_value ||
      !to_cs   || args[1]->null_value ||
2095
      !from_cs || args[2]->null_value ||
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      !(from_charset=get_charset_by_name(from_cs->ptr(), MYF(MY_WME))) ||
      !(to_charset=get_charset_by_name(to_cs->ptr(), MYF(MY_WME))))
2098 2099 2100 2101 2102 2103 2104
  {
    null_value=1;
    return 0;
  }

  s=(const uchar*)arg->ptr();
  se=s+arg->length();
2105

2106
  dmaxlen=arg->length()*to_charset->mbmaxlen+1;
2107 2108 2109
  str->alloc(dmaxlen);
  d0=d=(unsigned char*)str->ptr();
  de=d+dmaxlen;
2110

2111 2112
  while (1)
  {
2113
    cnvres=from_charset->cset->mb_wc(from_charset,&wc,s,se);
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
    if (cnvres>0)
    {
      s+=cnvres;
    }
    else if (cnvres==MY_CS_ILSEQ)
    {
      s++;
      wc='?';
    }
    else
      break;

outp:
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    cnvres=to_charset->cset->wc_mb(to_charset,wc,d,de);
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    if (cnvres>0)
    {
      d+=cnvres;
    }
    else if (cnvres==MY_CS_ILUNI && wc!='?')
    {
        wc='?';
        goto outp;
    }
    else
      break;
  };
2140

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  str->length((uint32) (d-d0));
2142 2143 2144 2145
  str->set_charset(to_charset);
  return str;
}

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2147 2148
void Item_func_conv_charset3::fix_length_and_dec()
{
2149
  max_length = args[0]->max_length;
2150 2151
}

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String *Item_func_set_collation::val_str(String *str)
{
  str=args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
2157
  str->set_charset(collation.collation);
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  return str;
}

2161
void Item_func_set_collation::fix_length_and_dec()
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{
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  CHARSET_INFO *set_collation;
  const char *colname;
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  String tmp, *str= args[1]->val_str(&tmp);
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  colname= str->c_ptr();
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  if (colname == binary_keyword)
2168
    set_collation= get_charset_by_csname(args[0]->collation.collation->csname,
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					 MY_CS_BINSORT,MYF(0));
  else
2171 2172 2173 2174 2175 2176 2177
  {
    if (!(set_collation= get_charset_by_name(colname,MYF(0))))
    {
      my_error(ER_UNKNOWN_COLLATION, MYF(0), colname);
      return;
    }
  }
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  if (!set_collation || 
      !my_charset_same(args[0]->collation.collation,set_collation))
2181
  {
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    my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
2183
      colname,args[0]->collation.collation->csname);
2184
    return;
2185
  }
2186
  collation.set(set_collation, DERIVATION_EXPLICIT);
2187
  max_length= args[0]->max_length;
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}

2190

2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
bool Item_func_set_collation::eq(const Item *item, bool binary_cmp) const
{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;
  if (item->type() != FUNC_ITEM)
    return 0;
  Item_func *item_func=(Item_func*) item;
  if (arg_count != item_func->arg_count ||
      func_name() != item_func->func_name())
    return 0;
  Item_func_set_collation *item_func_sc=(Item_func_set_collation*) item;
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  if (collation.collation != item_func_sc->collation.collation)
2204 2205 2206 2207 2208 2209 2210
    return 0;
  for (uint i=0; i < arg_count ; i++)
    if (!args[i]->eq(item_func_sc->args[i], binary_cmp))
      return 0;
  return 1;
}

2211 2212 2213 2214
String *Item_func_charset::val_str(String *str)
{
  String *res = args[0]->val_str(str);

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  if ((null_value=(args[0]->null_value || !res->charset())))
    return 0;
  str->copy(res->charset()->csname,strlen(res->charset()->csname),
2218
	    &my_charset_latin1, default_charset());
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  return str;
}

String *Item_func_collation::val_str(String *str)
{
  String *res = args[0]->val_str(str);

2226 2227
  if ((null_value=(args[0]->null_value || !res->charset())))
    return 0;
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  str->copy(res->charset()->name,strlen(res->charset()->name),
2229
	    &my_charset_latin1, default_charset());
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  return str;
}
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String *Item_func_hex::val_str(String *str)
{
  if (args[0]->result_type() != STRING_RESULT)
  {
    /* Return hex of unsigned longlong value */
    longlong dec= args[0]->val_int();
    char ans[65],*ptr;
    if ((null_value= args[0]->null_value))
      return 0;
    ptr= longlong2str(dec,ans,16);
2244
    if (str->copy(ans,(uint32) (ptr-ans),default_charset()))
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      return &my_empty_string;			// End of memory
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    return str;
  }

  /* Convert given string to a hex string, character by character */
  String *res= args[0]->val_str(str);
  const char *from, *end;
  char *to;
  if (!res || tmp_value.alloc(res->length()*2))
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  tmp_value.length(res->length()*2);
  for (from=res->ptr(), end=from+res->length(), to= (char*) tmp_value.ptr();
       from != end ;
       from++, to+=2)
  {
    uint tmp=(uint) (uchar) *from;
    to[0]=_dig_vec[tmp >> 4];
    to[1]=_dig_vec[tmp & 15];
  }
  return &tmp_value;
}


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#include <my_dir.h>				// For my_stat

String *Item_load_file::val_str(String *str)
{
  String *file_name;
  File file;
  MY_STAT stat_info;
  DBUG_ENTER("load_file");

  if (!(file_name= args[0]->val_str(str)) ||
      !(current_thd->master_access & FILE_ACL) ||
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      !my_stat(file_name->c_ptr(), &stat_info, MYF(MY_WME)))
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    goto err;
  if (!(stat_info.st_mode & S_IROTH))
  {
    /* my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), file_name->c_ptr()); */
    goto err;
  }
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  if (stat_info.st_size > (long) current_thd->variables.max_allowed_packet)
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  {
    /* my_error(ER_TOO_LONG_STRING, MYF(0), file_name->c_ptr()); */
    goto err;
  }
  if (tmp_value.alloc(stat_info.st_size))
    goto err;
  if ((file = my_open(file_name->c_ptr(), O_RDONLY, MYF(0))) < 0)
    goto err;
  if (my_read(file, (byte*) tmp_value.ptr(), stat_info.st_size, MYF(MY_NABP)))
  {
    my_close(file, MYF(0));
    goto err;
  }
  tmp_value.length(stat_info.st_size);
  my_close(file, MYF(0));
  null_value = 0;
  return &tmp_value;

err:
  null_value = 1;
  DBUG_RETURN(0);
}


String* Item_func_export_set::val_str(String* str)
{
  ulonglong the_set = (ulonglong) args[0]->val_int();
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  String yes_buf, *yes;
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  yes = args[1]->val_str(&yes_buf);
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  String no_buf, *no;
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  no = args[2]->val_str(&no_buf);
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  String *sep = NULL, sep_buf ;
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  uint num_set_values = 64;
  ulonglong mask = 0x1;
  str->length(0);

  /* Check if some argument is a NULL value */
  if (args[0]->null_value || args[1]->null_value || args[2]->null_value)
  {
    null_value=1;
    return 0;
  }
  switch(arg_count) {
  case 5:
    num_set_values = (uint) args[4]->val_int();
    if (num_set_values > 64)
      num_set_values=64;
    if (args[4]->null_value)
    {
      null_value=1;
      return 0;
    }
    /* Fall through */
  case 4:
    if (!(sep = args[3]->val_str(&sep_buf)))	// Only true if NULL
    {
      null_value=1;
      return 0;
    }
    break;
  case 3:
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    sep_buf.set(",", 1, default_charset());
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    sep = &sep_buf;
  }
  null_value=0;

  for (uint i = 0; i < num_set_values; i++, mask = (mask << 1))
  {
    if (the_set & mask)
      str->append(*yes);
    else
      str->append(*no);
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    if (i != num_set_values - 1)
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      str->append(*sep);
  }
  return str;
}

void Item_func_export_set::fix_length_and_dec()
{
  uint length=max(args[1]->max_length,args[2]->max_length);
  uint sep_length=(arg_count > 3 ? args[3]->max_length : 1);
  max_length=length*64+sep_length*63;
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  if (agg_arg_collations(collation, args+1, min(4,arg_count)-1))
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    return;
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}

String* Item_func_inet_ntoa::val_str(String* str)
{
  uchar buf[8], *p;
  ulonglong n = (ulonglong) args[0]->val_int();
  char num[4];
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  /*
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    We do not know if args[0] is NULL until we have called
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    some val function on it if args[0] is not a constant!
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    Also return null if n > 255.255.255.255
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  */
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  if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
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    return 0;					// Null value
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  str->length(0);
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  int4store(buf,n);
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  /* Now we can assume little endian. */
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  num[3]='.';
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  for (p=buf+4 ; p-- > buf ; )
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  {
    uint c = *p;
    uint n1,n2;					// Try to avoid divisions
    n1= c / 100;				// 100 digits
    c-= n1*100;
    n2= c / 10;					// 10 digits
    c-=n2*10;					// last digit
    num[0]=(char) n1+'0';
    num[1]=(char) n2+'0';
    num[2]=(char) c+'0';
    uint length=(n1 ? 4 : n2 ? 3 : 2);		// Remove pre-zero

    (void) str->append(num+4-length,length);
  }
  str->length(str->length()-1);			// Remove last '.';
  return str;
}
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/*
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  QUOTE() function returns argument string in single quotes suitable for
  using in a SQL statement.

  DESCRIPTION
    Adds a \ before all characters that needs to be escaped in a SQL string.
    We also escape '^Z' (END-OF-FILE in windows) to avoid probelms when
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    running commands from a file in windows.
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    This function is very useful when you want to generate SQL statements

    RETURN VALUES
    str		Quoted string
    NULL	Argument to QUOTE() was NULL or out of memory.
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*/
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#define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7))

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String *Item_func_quote::val_str(String *str)
{
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  /*
    Bit mask that has 1 for set for the position of the following characters:
    0, \, ' and ^Z
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  */
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  static uchar escmask[32]=
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  {
    0x01, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };
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  char *from, *to, *end, *start;
  String *arg= args[0]->val_str(str);
  uint arg_length, new_length;
  if (!arg)					// Null argument
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    goto null;
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  arg_length= arg->length();
  new_length= arg_length+2; /* for beginning and ending ' signs */
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  for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
    new_length+= get_esc_bit(escmask, *from);
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  /*
    We have to use realloc() instead of alloc() as we want to keep the
    old result in str
  */
  if (str->realloc(new_length))
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    goto null;
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  /*
    As 'arg' and 'str' may be the same string, we must replace characters
    from the end to the beginning
  */
  to= (char*) str->ptr() + new_length - 1;
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  *to--= '\'';
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  for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
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  {
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    /*
      We can't use the bitmask here as we want to replace \O and ^Z with 0
      and Z
    */
    switch (*end)  {
    case 0:
      *to--= '0';
      *to=   '\\';
      break;
    case '\032':
      *to--= 'Z';
      *to=   '\\';
      break;
    case '\'':
    case '\\':
      *to--= *end;
      *to=   '\\';
      break;
    default:
      *to= *end;
      break;
    }
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  }
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  *to= '\'';
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  str->length(new_length);
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  str->set_charset(collation.collation);
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  return str;
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null:
  null_value= 1;
  return 0;
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}
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longlong Item_func_uncompressed_length::val_int()
{
  String *res= args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  if (res->is_empty()) return 0;
  return uint4korr(res->c_ptr()) & 0x3FFFFFFF;
}

longlong Item_func_crc32::val_int()
{
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
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  return (longlong) crc32(0L, (uchar*)res->ptr(), res->length());
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}

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#ifdef HAVE_COMPRESS
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#include "zlib.h"
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String *Item_func_compress::val_str(String *str)
{
  String *res= args[0]->val_str(str);
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  if (!res)
  {
    null_value= 1;
    return 0;
  }
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  if (res->is_empty()) return res;

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  int err= Z_OK;
  int code;

  /*
   citation from zlib.h (comment for compress function):

    Compresses the source buffer into the destination buffer.  sourceLen is
   the byte length of the source buffer. Upon entry, destLen is the total
   size of the destination buffer, which must be at least 0.1% larger than
   sourceLen plus 12 bytes.

   Proportion 120/100 founded by Sinica with help of procedure
   compress(compress(compress(...)))
   I.e. zlib give number 'at least'..
  */
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  ulong new_size= (ulong)((res->length()*120)/100)+12;
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  buffer.realloc((uint32)new_size + 4 + 1);
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  Byte *body= ((Byte*)buffer.c_ptr()) + 4;
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  if ((err= compress(body, &new_size,
		     (const Bytef*)res->c_ptr(), res->length())) != Z_OK)
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  {
    code= err==Z_MEM_ERROR ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_BUF_ERROR;
    push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code));
    null_value= 1;
    return 0;
  }
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  char *tmp= buffer.c_ptr();	// int4store is a macro; avoid side effects
  int4store(tmp, res->length() & 0x3FFFFFFF);
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  /* This is for the stupid char fields which trim ' ': */
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  char *last_char= ((char*)body)+new_size-1;
  if (*last_char == ' ')
  {
    *++last_char= '.';
    new_size++;
  }
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  buffer.length((uint32)new_size + 4);
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  return &buffer;
}

String *Item_func_uncompress::val_str(String *str)
{
  String *res= args[0]->val_str(str);
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  if (!res)
  {
    null_value= 1;
    return 0;
  }
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  if (res->is_empty()) return res;

  ulong new_size= uint4korr(res->c_ptr()) & 0x3FFFFFFF;
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  int err= Z_OK;
  uint code;
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  if (new_size > MAX_BLOB_WIDTH)
  {
    push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,
			ER_TOO_BIG_FOR_UNCOMPRESS,
			ER(ER_TOO_BIG_FOR_UNCOMPRESS),MAX_BLOB_WIDTH);
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    null_value= 0;
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    return 0;
  }
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  buffer.realloc((uint32)new_size);
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  if ((err= uncompress((Byte*)buffer.c_ptr(), &new_size,
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		       ((const Bytef*)res->c_ptr())+4,res->length())) == Z_OK)
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  {
    buffer.length((uint32)new_size);
    return &buffer;
  }
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  code= err==Z_BUF_ERROR ? ER_ZLIB_Z_BUF_ERROR :
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    err==Z_MEM_ERROR ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_DATA_ERROR;
  push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code));
  null_value= 1;
  return 0;
}
#endif