item_strfunc.cc 65.4 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>
#ifdef HAVE_CRYPT_H
#include <crypt.h>
#endif
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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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String empty_string("",default_charset_info);
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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()
{
  String *res;
  res=val_str(&str_value);
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  return res ? my_strntod(res->charset(),res->ptr(),res->length(),NULL) : 0.0;
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}

longlong Item_str_func::val_int()
{
  String *res;
  res=val_str(&str_value);
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  return res ? my_strntoll(res->charset(),res->ptr(),res->length(),NULL,10) : (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++)
  {
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    if (args[i]->binary())
      set_charset(my_charset_bin);
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    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;
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	res->set_charset(charset());
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      }
      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;
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	res->set_charset(charset());
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	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;
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	res->set_charset(charset());
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	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;
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	res->set_charset(charset());
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	use_as_buff=str;
      }
    }
  }
  return res;

null:
  null_value=1;
  return 0;
}


void Item_func_concat::fix_length_and_dec()
{
  max_length=0;
  for (uint i=0 ; i < arg_count ; i++)
    max_length+=args[i]->max_length;
  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 &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;

  // Skip until non-null and non-empty argument is found.
  // If not, return the empty string
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  for (i=0; i < arg_count; i++)
    if ((res= args[i]->val_str(str)) && res->length())
      break;
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  if (i ==  arg_count)
    return &empty_string;
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  for (i++; i < arg_count ; i++)
  {
    if (!(res2= args[i]->val_str(use_as_buff)) || !res2->length())
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      continue;					// Skip NULL and empty string
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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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    }
  }
  return res;

null:
  null_value=1;
  return 0;
}


void Item_func_concat_ws::fix_length_and_dec()
{
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  max_length=separator->max_length*(arg_count-1);
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  for (uint i=0 ; i < arg_count ; i++)
    max_length+=args[i]->max_length;
  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
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  used_tables_cache|=separator->used_tables();
  const_item_cache&=separator->const_item();
}

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())
    return &empty_string;
  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()) && !binary())
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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()
{
  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_str;
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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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#ifdef USE_MB
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  binary_str = (args[0]->binary() || args[1]->binary() || !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;
  if (binary_str && (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_str)
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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;
        }
skipp:
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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
    max_length= max_length/args[1]->max_length;
    max_length= (max_length+1)*(uint) diff;
  }
  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


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 */
#ifdef USE_MB
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  if (use_mb(res->charset()) && !args[0]->binary())
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  {
    start=res->charpos(start);
    length=res->charpos(length,start);
  }
#endif
  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()
{
  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)
    return &empty_string;
#ifdef USE_MB
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  if (use_mb(res->charset()) && !binary())
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    length = res->charpos(length);
#endif
  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
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      set_charset(res->charset());
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      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())
  {
    int length=(int) args[1]->val_int();
    if (length <= 0)
      max_length=0;
    else
      set_if_smaller(max_length,(uint) length);
  }
}


void Item_func_left::fix_length_and_dec()
{
  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)
    return &empty_string; /* purecov: inspected */
  if (res->length() <= (uint) length)
    return res; /* purecov: inspected */
#ifdef USE_MB
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  if (use_mb(res->charset()) && !binary())
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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);
  }
  else
#endif
  {
    tmp_value.set(*res,(res->length()- (uint) length),(uint) length);
  }
  return &tmp_value;
}


void Item_func_right::fix_length_and_dec()
{
  left_right_max_length();
}


String *Item_func_substr::val_str(String *str)
{
  String *res  = args[0]->val_str(str);
  int32 start	= (int32) args[1]->val_int()-1;
  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 */
#ifdef USE_MB
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  if (use_mb(res->charset()) && !binary())
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  {
    start=res->charpos(start);
    length=res->charpos(length,start);
  }
#endif
  if (start < 0 || (uint) start+1 > res->length() || length <= 0)
    return &empty_string;

  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;

  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())
  {
    int32 length= (int32) args[2]->val_int();
    if (length <= 0)
      max_length=0; /* purecov: inspected */
    else
      set_if_smaller(max_length,(uint) length);
  }
}


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)
    return &empty_string;		// Wrong parameters

#ifdef USE_MB
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  if (use_mb(res->charset()) && !binary())
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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=args[1]->val_str(&tmp);
  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=args[1]->val_str(&tmp);
  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()) && !binary())
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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()) && !binary())
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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=args[1]->val_str(&tmp);
  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()) && !binary())
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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;
}


String *Item_func_password::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;
  if (res->length() == 0)
    return &empty_string;
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  make_scrambled_password(tmp_value,res->c_ptr(),opt_old_passwords,
                          &current_thd->rand);
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  str->set(tmp_value,get_password_length(opt_old_passwords),res->charset());
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  return str;
}

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String *Item_func_old_password::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;
  if (res->length() == 0)
    return &empty_string;
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  make_scrambled_password(tmp_value,res->c_ptr(),1,&current_thd->rand);
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  str->set(tmp_value,16,res->charset());
  return str;
}



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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)
    return &empty_string;

  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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    str->length(0);
  else
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    str->copy((const char*) thd->db,(uint) strlen(thd->db),
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	      system_charset_info, thd->variables.thd_charset);
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  return str;
}

String *Item_func_user::val_str(String *str)
{
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  THD          *thd=current_thd;
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  CHARSET_INFO *cs=thd->variables.thd_charset;
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  const char   *host=thd->host ? thd->host : thd->ip ? thd->ip : "";
  uint32       res_length=(strlen(thd->user)+strlen(host)+10) * cs->mbmaxlen;
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  if (str->alloc(res_length))
  {
      null_value=1;
      return 0;
  }
  res_length=cs->snprintf(cs, (char*)str->ptr(), res_length, "%s@%s",thd->user,host);
  str->length(res_length);
  str->set_charset(cs);
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  return str;
}

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


  /*
    If alpha, map input letter to soundex code.
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    If not alpha and remove_garbage is set then skip to next char
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    else return 0
    */

extern "C" {
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extern const char *soundex_map;		// In mysys/static.c
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}

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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=my_charset_latin1;

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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)
    return &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,thd_charset());
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  str_length=str->length();
  if (nr < 0)
    str_length--;				// Don't count sign
  length=str->length()+(diff=(str_length- dec-1)/3);
  if (diff)
  {
    char *tmp,*pos;
    str=copy_if_not_alloced(&tmp_str,str,length);
    str->length(length);
    tmp=(char*) str->ptr()+length - dec-1;
    for (pos=(char*) str->ptr()+length ; pos != tmp; pos--)
      pos[0]=pos[- (int) diff];
    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;
  for (uint i=1 ; i < arg_count ; i++)
  {
    set_if_bigger(max_length,args[i]->max_length);
    set_if_bigger(decimals,args[i]->decimals);
  }
  maybe_null=1;					// NULL if wrong first arg
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  with_sum_func= with_sum_func || item->with_sum_func;
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  used_tables_cache|=item->used_tables();
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  const_item_cache&=item->const_item();
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}


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


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

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

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


void Item_func_make_set::fix_length_and_dec()
{
  max_length=arg_count-1;
  for (uint i=1 ; i < arg_count ; i++)
    max_length+=args[i]->max_length;
  used_tables_cache|=item->used_tables();
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  const_item_cache&=item->const_item();
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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;
  String *result=&empty_string;

  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'
	      return &empty_string;
	    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))
	      return &empty_string;
	    result= &tmp_str;
	  }
	  if (tmp_str.append(',') || tmp_str.append(*res))
	    return &empty_string;
	}
      }
    }
  }
  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(charset()))
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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;
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        } 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()
{
  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
    return &empty_string;
  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()
{
  if (args[1]->const_item())
  {
    uint32 length= (uint32) args[1]->val_int();
    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)
{
  uint32 res_length,length_pad;
  char *to;
  const char *ptr_pad;
  int32 count= (int32) args[1]->val_int();
  String *res =args[0]->val_str(str);
  String *rpad = args[2]->val_str(str);

  if (!res || args[1]->null_value || !rpad)
    goto err;
  null_value=0;
  if (count <= (int32) (res_length=res->length()))
1805 1806 1807 1808
  {						// String to pad is big enough
    res->length(count);				// Shorten result if longer
    return (res);
  }
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  length_pad= rpad->length();
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  if ((ulong) count > current_thd->variables.max_allowed_packet ||
      args[2]->null_value || !length_pad)
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    goto err;
  if (!(res= alloc_buffer(res,str,&tmp_value,count)))
    goto err;

  to= (char*) res->ptr()+res_length;
  ptr_pad=rpad->ptr();
  for (count-= res_length; (uint32) count > length_pad; count-= length_pad)
  {
    memcpy(to,ptr_pad,length_pad);
    to+= length_pad;
  }
  memcpy(to,ptr_pad,(size_t) count);
  return (res);

 err:
  null_value=1;
  return 0;
}


void Item_func_lpad::fix_length_and_dec()
{
  if (args[1]->const_item())
  {
    uint32 length= (uint32) args[1]->val_int();
    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)
{
  uint32 res_length,length_pad;
  char *to;
  const char *ptr_pad;
  ulong count= (long) args[1]->val_int();
  String *res= args[0]->val_str(str);
  String *lpad= args[2]->val_str(str);

  if (!res || args[1]->null_value || !lpad)
    goto err;
  null_value=0;
  if (count <= (res_length=res->length()))
1865 1866 1867 1868
  {						// String to pad is big enough
    res->length(count);				// Shorten result if longer
    return (res);
  }
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  length_pad= lpad->length();
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  if (count > current_thd->variables.max_allowed_packet ||
      args[2]->null_value || !length_pad)
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    goto err;

  if (res->alloced_length() < count)
  {
    if (str->alloced_length() >= count)
    {
      memcpy((char*) str->ptr()+(count-res_length),res->ptr(),res_length);
      res=str;
    }
    else
    {
      if (tmp_value.alloc(count))
	goto err;
      memcpy((char*) tmp_value.ptr()+(count-res_length),res->ptr(),res_length);
      res=&tmp_value;
    }
  }
  else
    bmove_upp((char*) res->ptr()+count,res->ptr()+res_length,res_length);
  res->length(count);

  to= (char*) res->ptr();
  ptr_pad= lpad->ptr();
  for (count-= res_length; count > length_pad; count-= length_pad)
  {
    memcpy(to,ptr_pad,length_pad);
    to+= length_pad;
  }
  memcpy(to,ptr_pad,(size_t) count);
  return (res);

 err:
  null_value=1;
  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();

  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)
1926
    dec= my_strntoll(res->charset(),res->ptr(),res->length(),&endptr,-from_base);
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  else
1928
    dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),&endptr,from_base);
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  ptr= longlong2str(dec,ans,to_base);
1930
  if (str->copy(ans,(uint32) (ptr-ans), thd_charset()))
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    return &empty_string;
  return str;
}

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1936 1937 1938 1939 1940 1941
String *Item_func_conv_charset::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);
  CHARSET_INFO *from,*to;
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1946 1947 1948 1949 1950
  if (!arg)
  {
    null_value=1;
    return 0;
  }
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  null_value=0;
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1953 1954 1955 1956 1957
  from=arg->charset();
  to=conv_charset;

  s=(const uchar*)arg->ptr();
  se=s+arg->length();
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1959
  dmaxlen=arg->length()*to->mbmaxlen+1;
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  str->alloc(dmaxlen);
  d0=d=(unsigned char*)str->ptr();
  de=d+dmaxlen;
1963

1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
  while( s < se && d < de){

    cnvres=from->mb_wc(from,&wc,s,se);
    if (cnvres>0)
    {
      s+=cnvres;
    }
    else if (cnvres==MY_CS_ILSEQ)
    {
      s++;
      wc='?';
    }
    else
      break;

outp:
    cnvres=to->wc_mb(to,wc,d,de);
    if (cnvres>0)
    {
      d+=cnvres;
    }
    else if (cnvres==MY_CS_ILUNI && wc!='?')
    {
        wc='?';
        goto outp;
    }
    else
      break;
  };
1993

1994
  str->length((uint32) (d-d0));
1995 1996 1997 1998 1999 2000
  str->set_charset(to);
  return str;
}

void Item_func_conv_charset::fix_length_and_dec()
{
2001
  max_length = args[0]->max_length*conv_charset->mbmaxlen;
2002
  set_charset(conv_charset);
2003 2004
}

2005

2006

2007 2008 2009 2010 2011 2012
String *Item_func_conv_charset3::val_str(String *str)
{
  my_wc_t wc;
  int cnvres;
  const uchar *s, *se;
  uchar *d, *d0, *de;
2013
  uint32 dmaxlen;
2014 2015 2016 2017 2018
  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;
2019 2020 2021

  if (!arg     || args[0]->null_value ||
      !to_cs   || args[1]->null_value ||
2022
      !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))))
2025 2026 2027 2028 2029 2030 2031
  {
    null_value=1;
    return 0;
  }

  s=(const uchar*)arg->ptr();
  se=s+arg->length();
2032

2033
  dmaxlen=arg->length()*to_charset->mbmaxlen+1;
2034 2035 2036
  str->alloc(dmaxlen);
  d0=d=(unsigned char*)str->ptr();
  de=d+dmaxlen;
2037

2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
  while( s < se && d < de){

    cnvres=from_charset->mb_wc(from_charset,&wc,s,se);
    if (cnvres>0)
    {
      s+=cnvres;
    }
    else if (cnvres==MY_CS_ILSEQ)
    {
      s++;
      wc='?';
    }
    else
      break;

outp:
    cnvres=to_charset->wc_mb(to_charset,wc,d,de);
    if (cnvres>0)
    {
      d+=cnvres;
    }
    else if (cnvres==MY_CS_ILUNI && wc!='?')
    {
        wc='?';
        goto outp;
    }
    else
      break;
  };
2067

2068
  str->length((uint32) (d-d0));
2069 2070 2071 2072
  str->set_charset(to_charset);
  return str;
}

2073

2074
bool Item_func_conv_charset::fix_fields(THD *thd,struct st_table_list *tables, Item **ref)
2075 2076 2077 2078
{
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
  used_tables_cache=0;
  const_item_cache=1;
2079

2080 2081
  if (thd && check_stack_overrun(thd,buff))
    return 0;					// Fatal error if flag is set!
2082
  if (args[0]->check_cols(1) || args[0]->fix_fields(thd, tables, args))
2083 2084
    return 1;
  maybe_null=args[0]->maybe_null;
2085
  const_item_cache=args[0]->const_item();
2086
  set_charset(conv_charset);
2087
  fix_length_and_dec();
2088
  fixed= 1;
2089
  return 0;
2090 2091 2092
}


2093 2094
void Item_func_conv_charset3::fix_length_and_dec()
{
2095
  max_length = args[0]->max_length;
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}

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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;
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  str->set_charset(set_collation);
  return str;
}

2107
bool Item_func_set_collation::fix_fields(THD *thd,struct st_table_list *tables, Item **ref)
2108 2109 2110 2111
{
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
  used_tables_cache=0;
  const_item_cache=1;
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  if (thd && check_stack_overrun(thd,buff))
    return 0;					// Fatal error if flag is set!
2115
  if (args[0]->check_cols(1) || args[0]->fix_fields(thd, tables, args))
2116 2117
    return 1;
  maybe_null=args[0]->maybe_null;
2118
  set_charset(set_collation);
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  with_sum_func= with_sum_func || args[0]->with_sum_func;
  used_tables_cache=args[0]->used_tables();
  const_item_cache=args[0]->const_item();
2122
  fix_length_and_dec();
2123
  fixed= 1;
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  return 0;
}

2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
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;
  if (set_collation != item_func_sc->set_collation)
    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;
}

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

  if ((null_value=(args[0]->null_value || !res->charset())))
    return 0;
2153 2154
  str->copy(res->charset()->name,strlen(res->charset()->name),
	    my_charset_latin1, thd_charset());
2155 2156
  return str;
}
2157 2158


2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
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);
2169
    if (str->copy(ans,(uint32) (ptr-ans),default_charset_info))
2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
      return &empty_string;			// End of memory
    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) ||
2208
      !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;
  }
2215
  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();
2243
  String yes_buf, *yes;
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  yes = args[1]->val_str(&yes_buf);
2245
  String no_buf, *no;
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  no = args[2]->val_str(&no_buf);
2247
  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:
2278
    sep_buf.set(",", 1, default_charset_info);
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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);
2289
    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;
}

String* Item_func_inet_ntoa::val_str(String* str)
{
  uchar buf[8], *p;
  ulonglong n = (ulonglong) args[0]->val_int();
  char num[4];
2307

2308
  /*
2309
    We do not know if args[0] is NULL until we have called
2310
    some val function on it if args[0] is not a constant!
2311 2312

    Also return null if n > 255.255.255.255
2313
  */
2314
  if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
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    return 0;					// Null value
2316

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  str->length(0);
2318
  int4store(buf,n);
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2319

2320
  /* Now we can assume little endian. */
2321

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2322
  num[3]='.';
2323
  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;
}
2341

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2342

2343
/*
2344 2345 2346 2347 2348 2349
  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
2350
    running commands from a file in windows.
2351 2352 2353 2354 2355 2356

    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.
2357
*/
2358 2359 2360

#define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7))

2361 2362
String *Item_func_quote::val_str(String *str)
{
2363 2364 2365
  /*
    Bit mask that has 1 for set for the position of the following characters:
    0, \, ' and ^Z
2366
  */
2367

2368
  static uchar escmask[32]=
2369 2370 2371 2372 2373 2374
  {
    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
  };
2375

2376 2377 2378 2379
  char *from, *to, *end, *start;
  String *arg= args[0]->val_str(str);
  uint arg_length, new_length;
  if (!arg)					// Null argument
2380
    goto null;
2381 2382
  arg_length= arg->length();
  new_length= arg_length+2; /* for beginning and ending ' signs */
2383

2384 2385
  for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
    new_length+= get_esc_bit(escmask, *from);
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2387 2388 2389 2390 2391
  /*
    We have to use realloc() instead of alloc() as we want to keep the
    old result in str
  */
  if (str->realloc(new_length))
2392
    goto null;
2393 2394 2395 2396 2397 2398

  /*
    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;
2399
  *to--= '\'';
2400
  for (start= (char*) arg->ptr() ; 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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  return str;
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null:
  null_value= 1;
  return 0;
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}
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/*******************************************************
General functions for spatial objects
********************************************************/

String *Item_func_geometry_from_text::val_str(String *str)
{
  Geometry geom;
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  String arg_val;
  String *wkt = args[0]->val_str(&arg_val);
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  GTextReadStream trs(wkt->ptr(), wkt->length());

  str->length(0);
  if ((null_value=(args[0]->null_value || geom.create_from_wkt(&trs, str, 0))))
    return 0;
  return str;
}


void Item_func_geometry_from_text::fix_length_and_dec()
{
  max_length=MAX_BLOB_WIDTH;
}


String *Item_func_as_text::val_str(String *str)
{
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  String arg_val;
  String *wkt = args[0]->val_str(&arg_val);
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  Geometry geom;
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  if ((null_value=(args[0]->null_value ||
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                   geom.create_from_wkb(wkt->ptr(),wkt->length()))))
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    return 0;

  str->length(0);

  if ((null_value=geom.as_wkt(str)))
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    return 0;
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  return str;
}

void Item_func_as_text::fix_length_and_dec()
{
  max_length=MAX_BLOB_WIDTH;
}

String *Item_func_geometry_type::val_str(String *str)
{
  String *wkt = args[0]->val_str(str);
  Geometry geom;

  if ((null_value=(args[0]->null_value ||
                   geom.create_from_wkb(wkt->ptr(),wkt->length()))))
    return 0;
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  str->copy(geom.get_class_info()->m_name,
	    strlen(geom.get_class_info()->m_name),
	    default_charset_info);
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  return str;
}


String *Item_func_envelope::val_str(String *str)
{
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  String arg_val;
  String *wkb = args[0]->val_str(&arg_val);
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  Geometry geom;

  null_value = args[0]->null_value ||
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               geom.create_from_wkb(wkb->ptr(),wkb->length()) ||
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               geom.envelope(str);

  return null_value ? 0 : str;
}


String *Item_func_centroid::val_str(String *str)
{
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  String arg_val;
  String *wkb = args[0]->val_str(&arg_val);
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  Geometry geom;

  null_value = args[0]->null_value ||
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               geom.create_from_wkb(wkb->ptr(),wkb->length()) ||
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               !GEOM_METHOD_PRESENT(geom,centroid) ||
               geom.centroid(str);

  return null_value ? 0: str;
}


/***********************************************
  Spatial decomposition functions
***********************************************/

String *Item_func_spatial_decomp::val_str(String *str)
{
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  String arg_val;
  String *wkb = args[0]->val_str(&arg_val);
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  Geometry geom;

  if ((null_value = (args[0]->null_value ||
                     geom.create_from_wkb(wkb->ptr(),wkb->length()))))
    return 0;

  null_value=1;
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  str->length(0);
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  switch(decomp_func)
  {
    case SP_STARTPOINT:
      if (!GEOM_METHOD_PRESENT(geom,start_point) || geom.start_point(str))
        goto ret;
      break;

    case SP_ENDPOINT:
      if (!GEOM_METHOD_PRESENT(geom,end_point) || geom.end_point(str))
        goto ret;
      break;

    case SP_EXTERIORRING:
      if (!GEOM_METHOD_PRESENT(geom,exterior_ring) || geom.exterior_ring(str))
        goto ret;
      break;

    default:
      goto ret;
  }
  null_value=0;

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ret:
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  return null_value ? 0 : str;
}


String *Item_func_spatial_decomp_n::val_str(String *str)
{
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  String arg_val;
  String *wkb  =        args[0]->val_str(&arg_val);
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  long n       = (long) args[1]->val_int();
  Geometry geom;

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  if ((null_value = (args[0]->null_value ||
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                     args[1]->null_value ||
                     geom.create_from_wkb(wkb->ptr(),wkb->length()) )))
    return 0;

  null_value=1;

  switch(decomp_func_n)
  {
    case SP_POINTN:
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      if (!GEOM_METHOD_PRESENT(geom,point_n) ||
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          geom.point_n(n,str))
        goto ret;
      break;

    case SP_GEOMETRYN:
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      if (!GEOM_METHOD_PRESENT(geom,geometry_n) ||
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          geom.geometry_n(n,str))
        goto ret;
      break;

    case SP_INTERIORRINGN:
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      if (!GEOM_METHOD_PRESENT(geom,interior_ring_n) ||
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          geom.interior_ring_n(n,str))
        goto ret;
      break;

    default:
      goto ret;
  }
  null_value=0;

ret:
  return null_value ? 0 : str;
}



/***********************************************
Functions to concatinate various spatial objects
************************************************/


/*
*  Concatinate doubles into Point
*/


String *Item_func_point::val_str(String *str)
{
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  if ( (null_value = (args[0]->null_value ||
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                     args[1]->null_value ||
                     str->realloc(1+4+8+8))))
    return 0;

  str->length(0);
  str->q_append((char)Geometry::wkbNDR);
  str->q_append((uint32)Geometry::wkbPoint);
  str->q_append((double)args[0]->val());
  str->q_append((double)args[1]->val());
  return str;
}


/*
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  Concatinates various items into various collections
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  with checkings for valid wkb type of items.
  For example, MultiPoint can be a collection of Points only.
  coll_type contains wkb type of target collection.
  item_type contains a valid wkb type of items.
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  In the case when coll_type is wkbGeometryCollection,
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  we do not check wkb type of items, any is valid.
*/

String *Item_func_spatial_collection::val_str(String *str)
{
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  String arg_value;
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  uint i;

  null_value=1;

  str->length(0);
  if(str->reserve(9,512))
    return 0;

  str->q_append((char)Geometry::wkbNDR);
  str->q_append((uint32)coll_type);
  str->q_append((uint32)arg_count);

  for (i = 0; i < arg_count; ++i)
  {
    if (args[i]->null_value)
      goto ret;

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    String *res = args[i]->val_str(&arg_value);
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    if ( coll_type == Geometry::wkbGeometryCollection )
    {
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      /*
         In the case of GeometryCollection we don't need
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         any checkings for item types, so just copy them
         into target collection
      */
      if ((null_value=(str->reserve(res->length(),512))))
        goto ret;
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      str->q_append(res->ptr(),res->length());
    }
    else
    {
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      enum Geometry::wkbType wkb_type;
      uint32 len=res->length();
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      const char *data=res->ptr()+1;

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      /*
         In the case of named collection we must to
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         check that items are of specific type, let's
         do this checking now
      */
2695

2696
      if (len < 5)
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        goto ret;
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      wkb_type= (Geometry::wkbType) uint4korr(data);
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      data+=4;
      len-=5;
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      if (wkb_type != item_type)
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        goto ret;
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      switch (coll_type) {
      case Geometry::wkbMultiPoint:
      case Geometry::wkbMultiLineString:
      case Geometry::wkbMultiPolygon:
2708
	if (len < WKB_HEADER_SIZE)
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	  goto ret;
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	data+=WKB_HEADER_SIZE;
	len-=WKB_HEADER_SIZE;
	if (str->reserve(len,512))
	  goto ret;
	str->q_append(data,len);
	break;

      case Geometry::wkbLineString:
	if (str->reserve(POINT_DATA_SIZE,512))
	  goto ret;
	str->q_append(data,POINT_DATA_SIZE);
	break;

      case Geometry::wkbPolygon:
2725
      {
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	uint32 n_points;
	double x1, y1, x2, y2;

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	if (len < WKB_HEADER_SIZE + 4 + 8 + 8)
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	  goto ret;
	data+=WKB_HEADER_SIZE;
	len-=WKB_HEADER_SIZE;

	uint32 llen=len;
	const char *ldata=data;
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	n_points=uint4korr(data);
	data+=4;
	float8get(x1,data);
	data+=8;
	float8get(y1,data);
	data+=8;
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2744
	len-= 4 + 8 + 8;
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	if (len < n_points * POINT_DATA_SIZE)
	  goto ret;
	data+=(n_points-2) * POINT_DATA_SIZE;
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	float8get(x2,data);
	float8get(y2,data+8);
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2753 2754
	if ((x1 != x2) || (y1 != y2))
	  goto ret;
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	if (str->reserve(llen,512))
	  goto ret;
	str->q_append(ldata, llen);
      }
      break;
2761

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      default:
	goto ret;
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      }
    }
  }

2768
  if (str->length() > current_thd->variables.max_allowed_packet)
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    goto ret;

  null_value = 0;

ret:
  return null_value ? 0 : str;
}