item_strfunc.cc 69.6 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()
{
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  int err;
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  String *res;
  res=val_str(&str_value);
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  return res ? my_strntod(res->charset(), (char*) res->ptr(),res->length(),
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			  NULL, &err) : 0.0;
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}

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


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

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


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

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

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

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

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


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

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

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

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

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

null:
  null_value=1;
  return 0;
}


void Item_func_concat::fix_length_and_dec()
{
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  bool first_coll= 1;
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  max_length=0;
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  set_charset(args[0]->charset(),args[0]->coercibility);
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    max_length+=args[i]->max_length;
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    if (set_charset(charset(), coercibility,
		args[i]->charset(), args[i]->coercibility))
    {
      my_error(ER_WRONG_ARGUMENTS,MYF(0),func_name());
      break;
    }
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  }

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  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}

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

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String *Item_func_des_encrypt::val_str(String *str)
{
#ifdef HAVE_OPENSSL
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  des_cblock ivec;
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  struct st_des_keyblock keyblock;
  struct st_des_keyschedule keyschedule;
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  const char *append_str="********";
  uint key_number, res_length, tail;
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  String *res= args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
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  if ((res_length=res->length()) == 0)
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    return &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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    }
  }
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  res->set_charset(charset());
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  return res;

null:
  null_value=1;
  return 0;
}

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

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


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

  if ((null_value=args[0]->null_value))
    return 0;
  /* An empty string is a special case as the string pointer may be null */
  if (!res->length())
    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()))
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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_cmp;
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#endif

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

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

#ifdef USE_MB
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  if (!binary_cmp)
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  {
    search=res2->ptr();
    search_end=search+from_length;
redo:
    ptr=res->ptr()+offset;
    strend=res->ptr()+res->length();
    end=strend-from_length+1;
    while (ptr < end)
    {
        if (*ptr == *search)
        {
          register char *i,*j;
          i=(char*) ptr+1; j=(char*) search+1;
          while (j != search_end)
            if (*i++ != *j++) goto skipp;
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          offset= (int) (ptr-res->ptr());
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          if (res->length()-from_length + to_length >
	      current_thd->variables.max_allowed_packet)
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            goto null;
          if (!alloced)
          {
            alloced=1;
            res=copy_if_not_alloced(str,res,res->length()+to_length);
          }
          res->replace((uint) offset,from_length,*res3);
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	  offset+=(int) to_length;
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          goto redo;
        }
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
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    int max_substrs= max_length/args[1]->max_length;
    max_length+= max_substrs*(uint) diff;
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  }
  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 */
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  start=res->charpos(start);
  length=res->charpos(length,start);
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  if (start > res->length()+1)
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    return res;					// Wrong param; skip insert
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  if (length > res->length()-start)
    length=res->length()-start;
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  if (res->length() - length + res2->length() >
      current_thd->variables.max_allowed_packet)
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    goto null;					// OOM check
  res=copy_if_not_alloced(str,res,res->length());
  res->replace(start,length,*res2);
  return res;
null:
  null_value=1;
  return 0;
}


void Item_func_insert::fix_length_and_dec()
{
  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;
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  length= res->charpos(length);
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  if (res->length() > (ulong) length)
  {						// Safe even if const arg
    if (!res->alloced_length())
    {						// Don't change const str
      str_value= *res;				// Not malloced string
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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 */
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  uint start=res->numchars()-(uint) length;
  if (start<=0) return res;
  start=res->charpos(start);
  tmp_value.set(*res,start,res->length()-start);
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  return &tmp_value;
}


void Item_func_right::fix_length_and_dec()
{
  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 */
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  start=res->charpos(start);
  length=res->charpos(length,start);
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  if (start < 0 || (uint) start+1 > res->length() || length <= 0)
    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;

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  set_charset(args[0]->charset(), args[0]->coercibility);
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  if (args[1]->const_item())
  {
    int32 start=(int32) args[1]->val_int()-1;
    if (start < 0 || start >= (int32) max_length)
      max_length=0; /* purecov: inspected */
    else
      max_length-= (uint) start;
  }
  if (arg_count == 3 && args[2]->const_item())
  {
    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()))
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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()))
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    {
      while (ptr < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l,p=ptr;
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	else ++ptr;
      }
      ptr=p;
    }
#endif
    while (ptr != end  && end[-1] == chr)
      end--;
  }
  else
  {
    const char *r_ptr=remove_str->ptr();
#ifdef USE_MB
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    if (use_mb(res->charset()))
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    {
  loop:
      while (ptr + remove_length < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l;
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	else ++ptr;
      }
      if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
      {
	end-=remove_length;
	ptr=p;
	goto loop;
      }
    }
    else
#endif /* USE_MB */
    {
      while (ptr + remove_length < end &&
	     !memcmp(end-remove_length,r_ptr,remove_length))
	end-=remove_length;
    }
  }
  if (end == res->ptr()+res->length())
    return res;
  tmp_value.set(*res,0,(uint) (end-res->ptr()));
  return &tmp_value;
}


String *Item_func_trim::val_str(String *str)
{
  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;					/* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str=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()))
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  {
    char *p=ptr;
    register uint32 l;
 loop:
    while (ptr + remove_length < end)
    {
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      if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l;
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      else ++ptr;
    }
    if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
    {
      end-=remove_length;
      ptr=p;
      goto loop;
    }
    ptr=p;
  }
  else
#endif /* USE_MB */
  {
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    while (ptr + remove_length <= end &&
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	   !memcmp(end-remove_length,r_ptr,remove_length))
      end-=remove_length;
  }
  if (ptr == res->ptr() && end == ptr+res->length())
    return res;
  tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr));
  return &tmp_value;
}

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void Item_func_password::fix_length_and_dec()
{
  max_length= get_password_length(use_old_passwords);
}

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/*
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 Password() function has 2 arguments. Second argument can be used
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 to make results repeatable
*/ 
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String *Item_func_password::val_str(String *str)
{
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  struct rand_struct rand_st; // local structure for 2 param version
  ulong  seed=0;              // seed to initialise random generator to
  
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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 (arg_count == 1)
  {    
    if (res->length() == 0)
      return &empty_string;
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    make_scrambled_password(tmp_value,res->c_ptr(),use_old_passwords,
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                            &current_thd->rand);
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    str->set(tmp_value,get_password_length(use_old_passwords),res->charset());
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    return str;
  }
  else
  {
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   /* We'll need the buffer to get second parameter */
    char key_buff[80];
    String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
    String *key  =args[1]->val_str(&tmp_key_value);          
    
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    /* Check second argument for NULL value. First one is already checked */
    if ((null_value=args[1]->null_value))
      return 0;
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    /* This shall be done after checking for null for proper results */       
    if (res->length() == 0)
      return &empty_string;  
      
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    /* Generate the seed first this allows to avoid double allocation */  
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    char* seed_ptr=key->c_ptr();
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    while (*seed_ptr)
    {
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      seed=(seed*211+*seed_ptr) & 0xffffffffL; /* Use simple hashing */
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      seed_ptr++;
    }
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    /* Use constants which allow nice random values even with small seed */
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    randominit(&rand_st,
	       (ulong) ((ulonglong) seed*111111+33333333L) & (ulong) 0xffffffff,
	       (ulong) ((ulonglong) seed*1111+55555555L) & (ulong) 0xffffffff);
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    make_scrambled_password(tmp_value,res->c_ptr(),use_old_passwords,
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                            &rand_st);
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    str->set(tmp_value,get_password_length(use_old_passwords),res->charset());
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    return str;
  }       
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}

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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, default_charset());
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  return str;
}

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

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String *Item_func_user::val_str(String *str)
{
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  THD          *thd=current_thd;
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  CHARSET_INFO *cs= default_charset();
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  const char   *host=thd->host ? thd->host : thd->ip ? thd->ip : "";
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  // For system threads (e.g. replication SQL thread) user may be empty
  if (!thd->user)
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    return &empty_string;
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  uint32       res_length=(strlen(thd->user)+strlen(host)+2) * cs->mbmaxlen;
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  if (str->alloc(res_length))
  {
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    null_value=1;
    return 0;
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  }
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  res_length=cs->snprintf(cs, (char*)str->ptr(), res_length, "%s@%s",
			  thd->user, host);
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  str->length(res_length);
  str->set_charset(cs);
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  return str;
}

void Item_func_soundex::fix_length_and_dec()
{
  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,default_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;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
    set_if_bigger(max_length,args[i]->max_length);
    set_if_bigger(decimals,args[i]->decimals);
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    if (i == 0)
      set_charset(args[i]->charset(),args[i]->coercibility);
    else
    {
      if (set_charset(charset(), coercibility,
		      args[i]->charset(), args[i]->coercibility))
      {
        my_error(ER_WRONG_ARGUMENTS,MYF(0),func_name());
        break;
      }
    }
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  }
  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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}


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


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void Item_func_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;
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  String *res;
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  if ((tmp=(uint) item->val_int()) == 0 || tmp > arg_count)
  {
    null_value=1;
    return NULL;
  }
  null_value=0;
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  res= args[tmp-1]->val_str(str);
  res->set_charset(charset());
  return res;
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}


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


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void Item_func_make_set::fix_length_and_dec()
{
  max_length=arg_count-1;
  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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  with_sum_func= with_sum_func || item->with_sum_func;
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}


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


String *Item_func_make_set::val_str(String *str)
{
  ulonglong bits;
  bool first_found=0;
  Item **ptr=args;
  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()
{
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  set_charset(args[0]->charset(), args[0]->coercibility);
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  if (args[1]->const_item())
  {
    max_length=(long) (args[0]->max_length * args[1]->val_int());
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}

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

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

  if (args[0]->null_value || args[1]->null_value)
    goto err;				// string and/or delim are null
  null_value=0;
  if (count <= 0)			// For nicer SQL code
    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()))
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  {						// 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()))
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  {						// 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();
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  int err;
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  if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
      abs(to_base) > 36 || abs(to_base) < 2 ||
      abs(from_base) > 36 || abs(from_base) < 2 || !(res->length()))
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  if (from_base < 0)
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    dec= my_strntoll(res->charset(),res->ptr(),res->length(),-from_base,&endptr,&err);
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  else
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    dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),from_base,&endptr,&err);
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  ptr= longlong2str(dec,ans,to_base);
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  if (str->copy(ans,(uint32) (ptr-ans), default_charset()))
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    return &empty_string;
  return str;
}

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String *Item_func_conv_charset::val_str(String *str)
{
  String *arg= args[0]->val_str(str);
  if (!arg)
  {
    null_value=1;
    return 0;
  }
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  null_value= str->copy(arg->ptr(),arg->length(),arg->charset(),conv_charset);
  return null_value ? 0 : str;
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}

void Item_func_conv_charset::fix_length_and_dec()
{
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  set_charset(conv_charset);
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  max_length = args[0]->max_length*conv_charset->mbmaxlen;
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  set_charset(conv_charset, COER_IMPLICIT);
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}

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String *Item_func_conv_charset3::val_str(String *str)
{
  my_wc_t wc;
  int cnvres;
  const uchar *s, *se;
  uchar *d, *d0, *de;
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  uint32 dmaxlen;
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  String *arg= args[0]->val_str(str);
  String *to_cs= args[1]->val_str(str);
  String *from_cs= args[2]->val_str(str);
  CHARSET_INFO *from_charset;
  CHARSET_INFO *to_charset;
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  if (!arg     || args[0]->null_value ||
      !to_cs   || args[1]->null_value ||
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      !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))))
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  {
    null_value=1;
    return 0;
  }

  s=(const uchar*)arg->ptr();
  se=s+arg->length();
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  dmaxlen=arg->length()*to_charset->mbmaxlen+1;
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  str->alloc(dmaxlen);
  d0=d=(unsigned char*)str->ptr();
  de=d+dmaxlen;
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  while (1)
  {
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    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;
  };
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  str->length((uint32) (d-d0));
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  str->set_charset(to_charset);
  return str;
}

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void Item_func_conv_charset3::fix_length_and_dec()
{
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  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(charset());
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  return str;
}

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void Item_func_set_collation::fix_length_and_dec()
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{
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  CHARSET_INFO *set_collation;
  const char *colname;
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  String tmp, *str= args[1]->val_str(&tmp);
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  colname= str->c_ptr();
  if (!strncmp(colname,"BINARY",6))
    set_collation= get_charset_by_csname(args[0]->charset()->csname,
					 MY_CS_BINSORT,MYF(0));
  else
    set_collation= get_charset_by_name(colname,MYF(0));
  
  if (!set_collation)
  {
    my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), str->c_ptr());
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    return;
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  }
  
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  if (!my_charset_same(args[0]->charset(),set_collation))
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  {
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    my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
      set_collation->name,args[0]->charset()->csname);
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    return;
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  }
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  set_charset(set_collation, COER_EXPLICIT);
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  max_length= args[0]->max_length;
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}

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bool Item_func_set_collation::eq(const Item *item, bool binary_cmp) const
{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;
  if (item->type() != FUNC_ITEM)
    return 0;
  Item_func *item_func=(Item_func*) item;
  if (arg_count != item_func->arg_count ||
      func_name() != item_func->func_name())
    return 0;
  Item_func_set_collation *item_func_sc=(Item_func_set_collation*) item;
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  if (charset() != item_func_sc->charset())
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    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);

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

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

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  if ((null_value=(args[0]->null_value || !res->charset())))
    return 0;
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  str->copy(res->charset()->name,strlen(res->charset()->name),
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	    &my_charset_latin1, default_charset());
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  return str;
}
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String *Item_func_hex::val_str(String *str)
{
  if (args[0]->result_type() != STRING_RESULT)
  {
    /* Return hex of unsigned longlong value */
    longlong dec= args[0]->val_int();
    char ans[65],*ptr;
    if ((null_value= args[0]->null_value))
      return 0;
    ptr= longlong2str(dec,ans,16);
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    if (str->copy(ans,(uint32) (ptr-ans),default_charset_info))
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      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) ||
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      !my_stat(file_name->c_ptr(), &stat_info, MYF(MY_WME)))
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    goto err;
  if (!(stat_info.st_mode & S_IROTH))
  {
    /* my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), file_name->c_ptr()); */
    goto err;
  }
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  if (stat_info.st_size > (long) current_thd->variables.max_allowed_packet)
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  {
    /* my_error(ER_TOO_LONG_STRING, MYF(0), file_name->c_ptr()); */
    goto err;
  }
  if (tmp_value.alloc(stat_info.st_size))
    goto err;
  if ((file = my_open(file_name->c_ptr(), O_RDONLY, MYF(0))) < 0)
    goto err;
  if (my_read(file, (byte*) tmp_value.ptr(), stat_info.st_size, MYF(MY_NABP)))
  {
    my_close(file, MYF(0));
    goto err;
  }
  tmp_value.length(stat_info.st_size);
  my_close(file, MYF(0));
  null_value = 0;
  return &tmp_value;

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


String* Item_func_export_set::val_str(String* str)
{
  ulonglong the_set = (ulonglong) args[0]->val_int();
2314
  String yes_buf, *yes;
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  yes = args[1]->val_str(&yes_buf);
2316
  String no_buf, *no;
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  no = args[2]->val_str(&no_buf);
2318
  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:
2349
    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);
2360
    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];
2378

2379
  /*
2380
    We do not know if args[0] is NULL until we have called
2381
    some val function on it if args[0] is not a constant!
2382 2383

    Also return null if n > 255.255.255.255
2384
  */
2385
  if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
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    return 0;					// Null value
2387

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2388
  str->length(0);
2389
  int4store(buf,n);
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2390

2391
  /* Now we can assume little endian. */
2392

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2393
  num[3]='.';
2394
  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;
}
2412

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2413

2414
/*
2415 2416 2417 2418 2419 2420
  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
2421
    running commands from a file in windows.
2422 2423 2424 2425 2426 2427

    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.
2428
*/
2429 2430 2431

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

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String *Item_func_quote::val_str(String *str)
{
2434 2435 2436
  /*
    Bit mask that has 1 for set for the position of the following characters:
    0, \, ' and ^Z
2437
  */
2438

2439
  static uchar escmask[32]=
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  {
    0x01, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };
2446

2447 2448 2449 2450
  char *from, *to, *end, *start;
  String *arg= args[0]->val_str(str);
  uint arg_length, new_length;
  if (!arg)					// Null argument
2451
    goto null;
2452 2453
  arg_length= arg->length();
  new_length= arg_length+2; /* for beginning and ending ' signs */
2454

2455 2456
  for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
    new_length+= get_esc_bit(escmask, *from);
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2458 2459 2460 2461 2462
  /*
    We have to use realloc() instead of alloc() as we want to keep the
    old result in str
  */
  if (str->realloc(new_length))
2463
    goto null;
2464 2465 2466 2467 2468 2469

  /*
    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;
2470
  *to--= '\'';
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2471
  for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
2472
  {
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494
    /*
      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;
    }
2495
  }
2496
  *to= '\'';
2497
  str->length(new_length);
2498
  return str;
2499 2500 2501 2502

null:
  null_value= 1;
  return 0;
2503
}
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2504 2505


2506 2507 2508 2509 2510 2511 2512
/*******************************************************
General functions for spatial objects
********************************************************/

String *Item_func_geometry_from_text::val_str(String *str)
{
  Geometry geom;
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  String arg_val;
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  String *wkt= args[0]->val_str(&arg_val);
2515
  GTextReadStream trs(wkt->ptr(), wkt->length());
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2516
  uint32 srid;
2517

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  if ((arg_count == 2) && !args[1]->null_value)
    srid= args[1]->val_int();
  else
    srid= 0;

  if (str->reserve(SRID_SIZE, 512))
    return 0;
2525
  str->length(0);
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  str->q_append(srid);
2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
  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;
}


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String *Item_func_geometry_from_wkb::val_str(String *str)
{
  String arg_val;
  String *wkb= args[0]->val_str(&arg_val);
  Geometry geom;
  uint32 srid;

  if ((arg_count == 2) && !args[1]->null_value)
    srid= args[1]->val_int();
  else
    srid= 0;

  if (str->reserve(SRID_SIZE, 512))
    return 0;
  str->length(0);
  str->q_append(srid);
  if ((null_value= (args[0]->null_value ||
		    geom.create_from_wkb(wkb->ptr(), wkb->length()))))
    return 0;

  str->append(*wkb);
  return str;
}


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


2570 2571
String *Item_func_as_text::val_str(String *str)
{
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  String arg_val;
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  String *swkb= args[0]->val_str(&arg_val);
2574
  Geometry geom;
2575

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2576 2577 2578
  if ((null_value= (args[0]->null_value ||
		    geom.create_from_wkb(swkb->ptr() + SRID_SIZE,
					 swkb->length() - SRID_SIZE))))
2579 2580 2581 2582
    return 0;

  str->length(0);

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2583
  if ((null_value= geom.as_wkt(str)))
2584
    return 0;
2585

2586 2587 2588 2589 2590 2591 2592 2593 2594 2595
  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)
{
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2596
  String *swkb= args[0]->val_str(str);
2597 2598
  Geometry geom;

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  if ((null_value= (args[0]->null_value ||
		    geom.create_from_wkb(swkb->ptr() + SRID_SIZE,
					 swkb->length() - SRID_SIZE))))
2602
    return 0;
2603 2604 2605
  str->copy(geom.get_class_info()->m_name,
	    strlen(geom.get_class_info()->m_name),
	    default_charset_info);
2606 2607 2608 2609 2610 2611
  return str;
}


String *Item_func_envelope::val_str(String *str)
{
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  String *res= args[0]->val_str(str);
2613
  Geometry geom;
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2614
  
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  if ((null_value= args[0]->null_value ||
		   geom.create_from_wkb(res->ptr() + SRID_SIZE,
					res->length() - SRID_SIZE)))
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    return 0;
  
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  uint32 srid= uint4korr(res->ptr());
  if (res->reserve(SRID_SIZE, 512))
    return 0;
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2623
  res->length(0);
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2624
  res->q_append(srid);
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2625
  return (null_value= geom.envelope(res)) ? 0 : res;
2626 2627 2628 2629 2630
}


String *Item_func_centroid::val_str(String *str)
{
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  String arg_val;
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  String *swkb= args[0]->val_str(&arg_val);
2633 2634
  Geometry geom;

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2635 2636 2637 2638 2639
  if ((null_value= args[0]->null_value ||
		   geom.create_from_wkb(swkb->ptr() + SRID_SIZE,
					swkb->length() - SRID_SIZE) ||
		   !GEOM_METHOD_PRESENT(geom, centroid)))
    return 0;
2640

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  if (str->reserve(SRID_SIZE, 512))
    return 0;
  str->length(0);
  uint32 srid= uint4korr(swkb->ptr());
  str->q_append(srid);

  return (null_value= geom.centroid(str)) ? 0 : str;
2648 2649 2650 2651 2652 2653 2654 2655 2656
}


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

String *Item_func_spatial_decomp::val_str(String *str)
{
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2657
  String arg_val;
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  String *swkb= args[0]->val_str(&arg_val);
2659 2660
  Geometry geom;

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  if ((null_value= (args[0]->null_value ||
		    geom.create_from_wkb(swkb->ptr() + SRID_SIZE,
					 swkb->length() - SRID_SIZE))))
2664 2665
    return 0;

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  null_value= 1;
  if (str->reserve(SRID_SIZE, 512))
    return 0;
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2669
  str->length(0);
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  uint32 srid= uint4korr(swkb->ptr());
  str->q_append(srid);
2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691
  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;
  }
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2692
  null_value= 0;
2693

2694
ret:
2695 2696 2697 2698 2699 2700
  return null_value ? 0 : str;
}


String *Item_func_spatial_decomp_n::val_str(String *str)
{
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  String arg_val;
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  String *swkb= args[0]->val_str(&arg_val);
  long n= (long) args[1]->val_int();
2704 2705
  Geometry geom;

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  if ((null_value= (args[0]->null_value || args[1]->null_value ||
		    geom.create_from_wkb(swkb->ptr() + SRID_SIZE,
					 swkb->length() - SRID_SIZE))))
2709 2710
    return 0;

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  null_value= 1;
  if (str->reserve(SRID_SIZE, 512))
    return 0;
  str->length(0);
  uint32 srid= uint4korr(swkb->ptr());
  str->q_append(srid);
2717 2718 2719
  switch(decomp_func_n)
  {
    case SP_POINTN:
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2720
      if (!GEOM_METHOD_PRESENT(geom,point_n) || geom.point_n(n,str))
2721 2722 2723 2724
        goto ret;
      break;

    case SP_GEOMETRYN:
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2725
      if (!GEOM_METHOD_PRESENT(geom,geometry_n) || geom.geometry_n(n,str))
2726 2727 2728 2729
        goto ret;
      break;

    case SP_INTERIORRINGN:
2730
      if (!GEOM_METHOD_PRESENT(geom,interior_ring_n) ||
2731 2732 2733 2734 2735 2736 2737
          geom.interior_ring_n(n,str))
        goto ret;
      break;

    default:
      goto ret;
  }
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2738
  null_value= 0;
2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757

ret:
  return null_value ? 0 : str;
}



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


/*
*  Concatinate doubles into Point
*/


String *Item_func_point::val_str(String *str)
{
2758 2759 2760
  double x= args[0]->val();
  double y= args[1]->val();

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  if ( (null_value= (args[0]->null_value ||
		     args[1]->null_value ||
		     str->realloc(1 + 4 + 8 + 8))))
2764 2765 2766 2767 2768
    return 0;

  str->length(0);
  str->q_append((char)Geometry::wkbNDR);
  str->q_append((uint32)Geometry::wkbPoint);
2769 2770
  str->q_append(x);
  str->q_append(y);
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  return str;
}


/*
2776
  Concatinates various items into various collections
2777 2778 2779 2780
  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.
2781
  In the case when coll_type is wkbGeometryCollection,
2782 2783 2784 2785 2786
  we do not check wkb type of items, any is valid.
*/

String *Item_func_spatial_collection::val_str(String *str)
{
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2787
  String arg_value;
2788 2789
  uint i;

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  null_value= 1;
2791 2792

  str->length(0);
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  if (str->reserve(1 + 4 + 4, 512))
2794 2795
    return 0;

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  str->q_append((char) Geometry::wkbNDR);
  str->q_append((uint32) coll_type);
  str->q_append((uint32) arg_count);
2799

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  for (i= 0; i < arg_count; ++i)
2801
  {
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2802
    String *res= args[i]->val_str(&arg_value);
2803 2804 2805 2806 2807
    if (args[i]->null_value)
      goto ret;

    if ( coll_type == Geometry::wkbGeometryCollection )
    {
2808 2809
      /*
         In the case of GeometryCollection we don't need
2810 2811 2812
         any checkings for item types, so just copy them
         into target collection
      */
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2813
      if ((null_value= str->reserve(res->length(), 512)))
2814
        goto ret;
2815

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2816
      str->q_append(res->ptr(), res->length());
2817 2818 2819
    }
    else
    {
2820 2821
      enum Geometry::wkbType wkb_type;
      uint32 len=res->length();
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2822
      const char *data= res->ptr() + 1;
2823

2824 2825
      /*
         In the case of named collection we must to
2826 2827 2828
         check that items are of specific type, let's
         do this checking now
      */
2829

2830
      if (len < 5)
2831
        goto ret;
2832
      wkb_type= (Geometry::wkbType) uint4korr(data);
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      data+= 4;
      len-= 5;
2835
      if (wkb_type != item_type)
2836
        goto ret;
2837

2838 2839 2840 2841
      switch (coll_type) {
      case Geometry::wkbMultiPoint:
      case Geometry::wkbMultiLineString:
      case Geometry::wkbMultiPolygon:
2842
	if (len < WKB_HEADER_SIZE)
2843
	  goto ret;
2844

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	data-= WKB_HEADER_SIZE;
	len+= WKB_HEADER_SIZE;
	if (str->reserve(len, 512))
2848
	  goto ret;
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2849
	str->q_append(data, len);
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	break;

      case Geometry::wkbLineString:
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2853
	if (str->reserve(POINT_DATA_SIZE, 512))
2854
	  goto ret;
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2855
	str->q_append(data, POINT_DATA_SIZE);
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	break;

      case Geometry::wkbPolygon:
2859
      {
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	uint32 n_points;
	double x1, y1, x2, y2;

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2863
	if (len < 4 + 2 * POINT_DATA_SIZE)
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	  goto ret;

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	uint32 llen= len;
	const char *ldata= data;
2868

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	n_points= uint4korr(data);
	data+= 4;
	float8get(x1, data);
	data+= 8;
	float8get(y1, data);
	data+= 8;
2875

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2876
	data+= (n_points - 2) * POINT_DATA_SIZE;
2877

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	float8get(x2, data);
	float8get(y2, data + 8);
2880

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	if ((x1 != x2) || (y1 != y2))
	  goto ret;
2883

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2884
	if (str->reserve(llen, 512))
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	  goto ret;
	str->q_append(ldata, llen);
      }
      break;
2889

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      default:
	goto ret;
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      }
    }
  }

2896
  if (str->length() > current_thd->variables.max_allowed_packet)
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    goto ret;

  null_value = 0;

ret:
  return null_value ? 0 : str;
}