item_strfunc.cc 71.2 KB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


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

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

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

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

double Item_str_func::val()
{
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  DBUG_ASSERT(fixed == 1);
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  int err;
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  char buff[64];
  String *res, tmp(buff,sizeof(buff), &my_charset_bin);
  res= val_str(&tmp);
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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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  DBUG_ASSERT(fixed == 1);
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  int err;
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  char buff[22];
  String *res, tmp(buff,sizeof(buff), &my_charset_bin);
  res= val_str(&tmp);
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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)
{
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  DBUG_ASSERT(fixed == 1);
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  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)
{
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  DBUG_ASSERT(fixed == 1);
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  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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  DBUG_ASSERT(fixed == 1);
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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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  DBUG_ASSERT(fixed == 1);
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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)
{
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  DBUG_ASSERT(fixed == 1);
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  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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      {
	push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			    ER_WARN_ALLOWED_PACKET_OVERFLOWED,
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			    ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
			    current_thd->variables.max_allowed_packet);
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	goto null;
      }
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      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);
	}
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        res= str;
        use_as_buff= &tmp_value;
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      }
      else if (res == &tmp_value)
      {
	if (res->append(*res2))			// Must be a blob
	  goto null;
      }
      else if (res2 == &tmp_value)
      {						// This can happend only 1 time
	if (tmp_value.replace(0,0,*res))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;			// Put next arg here
      }
      else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() &&
	       res2->ptr() <= tmp_value.ptr() + tmp_value.alloced_length())
      {
	/*
	  This happens really seldom:
	  In this case res2 is sub string of tmp_value.  We will
	  now work in place in tmp_value to set it to res | res2
	*/
	/* Chop the last characters in tmp_value that isn't in res2 */
	tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) +
			 res2->length());
	/* Place res2 at start of tmp_value, remove chars before res2 */
	if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()),
			      *res))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;			// Put next arg here
      }
      else
      {						// Two big const strings
	if (tmp_value.alloc(max_length) ||
	    tmp_value.copy(*res) ||
	    tmp_value.append(*res2))
	  goto null;
	res= &tmp_value;
	use_as_buff=str;
      }
    }
  }
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  res->set_charset(collation.collation);
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  return res;

null:
  null_value=1;
  return 0;
}


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

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

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

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

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

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  tail=  (8-(res_length) % 8);			// 1..8 marking extra length
  res_length+=tail;
  if (tail && res->append(append_str, tail) || tmp_value.alloc(res_length+1))
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    goto error;
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  (*res)[res_length-1]=tail;			// save extra length
  tmp_value.length(res_length+1);
  tmp_value[0]=(char) (128 | key_number);
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  // Real encryption
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  bzero((char*) &ivec,sizeof(ivec));
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  DES_ede3_cbc_encrypt((const uchar*) (res->ptr()),
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		       (uchar*) (tmp_value.ptr()+1),
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		       res_length,
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		       &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)
{
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  DBUG_ASSERT(fixed == 1);
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#ifdef HAVE_OPENSSL
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  DES_key_schedule ks1, ks2, ks3;
  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,
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		       &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)
{
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  DBUG_ASSERT(fixed == 1);
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  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;
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  if (!(sep_str= args[0]->val_str(&tmp_sep_str)))
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    goto null;

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

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

null:
  null_value=1;
  return 0;
}


void Item_func_concat_ws::fix_length_and_dec()
{
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  max_length=0;

  if (agg_arg_collations(collation, args, arg_count))
    return;

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  /*
     arg_count cannot be less than 2,
     it is done on parser level in sql_yacc.yy
     so, (arg_count - 2) is safe here.
  */
  max_length= args[0]->max_length * (arg_count - 2);
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  for (uint i=1 ; i < arg_count ; i++)
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    max_length+=args[i]->max_length;
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  if (max_length > MAX_BLOB_WIDTH)
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
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}

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String *Item_func_reverse::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res = args[0]->val_str(str);
  char *ptr,*end;

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


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

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

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

String *Item_func_replace::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res,*res2,*res3;
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  int offset;
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  uint from_length,to_length;
  bool alloced=0;
#ifdef USE_MB
  const char *ptr,*end,*strend,*search,*search_end;
  register uint32 l;
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  bool binary_cmp;
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#endif

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

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  res->set_charset(collation.collation);

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

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

#ifdef USE_MB
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  if (!binary_cmp)
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  {
    search=res2->ptr();
    search_end=search+from_length;
redo:
    ptr=res->ptr()+offset;
    strend=res->ptr()+res->length();
    end=strend-from_length+1;
    while (ptr < end)
    {
        if (*ptr == *search)
        {
          register char *i,*j;
          i=(char*) ptr+1; j=(char*) search+1;
          while (j != search_end)
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            if (*i++ != *j++) goto skip;
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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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	  {
	    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
				ER_WARN_ALLOWED_PACKET_OVERFLOWED,
				ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
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				func_name(),
				current_thd->variables.max_allowed_packet);
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            goto null;
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	  }
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          if (!alloced)
          {
            alloced=1;
            res=copy_if_not_alloced(str,res,res->length()+to_length);
          }
          res->replace((uint) offset,from_length,*res3);
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	  offset+=(int) to_length;
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          goto redo;
        }
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skip:
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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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      {
	push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			    ER_WARN_ALLOWED_PACKET_OVERFLOWED,
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			    ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED), func_name(),
			    current_thd->variables.max_allowed_packet);
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        goto null;
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      }
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      if (!alloced)
      {
        alloced=1;
        res=copy_if_not_alloced(str,res,res->length()+to_length);
      }
      res->replace((uint) offset,from_length,*res3);
      offset+=(int) to_length;
    }
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    while ((offset=res->strstr(*res2,(uint) offset)) >= 0);
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  return res;

null:
  null_value=1;
  return 0;
}


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


String *Item_func_insert::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  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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  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_ALLOWED_PACKET_OVERFLOWED,
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			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
			func_name(), current_thd->variables.max_allowed_packet);
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    goto null;
  }
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  res=copy_if_not_alloced(str,res,res->length());
  res->replace(start,length,*res2);
  return res;
null:
  null_value=1;
  return 0;
}


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


String *Item_func_lcase::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  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)
{
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  DBUG_ASSERT(fixed == 1);
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  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)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res  =args[0]->val_str(str);
  long length  =(long) args[1]->val_int();
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  uint char_pos;
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  if ((null_value=args[0]->null_value))
    return 0;
  if (length <= 0)
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    return &my_empty_string;
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  if (res->length() <= (uint) length ||
      res->length() <= (char_pos= res->charpos(length)))
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    return res;
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  str_value.set(*res, 0, char_pos);
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  return &str_value;
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}


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


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


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

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


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


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

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

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


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

1042
  collation.set(args[0]->collation);
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  if (args[1]->const_item())
  {
    int32 start=(int32) args[1]->val_int()-1;
    if (start < 0 || start >= (int32) max_length)
      max_length=0; /* purecov: inspected */
    else
      max_length-= (uint) start;
  }
  if (arg_count == 3 && args[2]->const_item())
  {
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    int32 length= (int32) args[2]->val_int() * collation.collation->mbmaxlen;
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    if (length <= 0)
      max_length=0; /* purecov: inspected */
    else
      set_if_smaller(max_length,(uint) length);
  }
}


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


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

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

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#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    const char *ptr=res->ptr();
    const char *strend = ptr+res->length();
    const char *end=strend-delimeter_length+1;
    const char *search=delimeter->ptr();
    const char *search_end=search+delimeter_length;
    int32 n=0,c=count,pass;
    register uint32 l;
    for (pass=(count>0);pass<2;++pass)
    {
      while (ptr < end)
      {
        if (*ptr == *search)
        {
	  register char *i,*j;
	  i=(char*) ptr+1; j=(char*) search+1;
	  while (j != search_end)
1110
	    if (*i++ != *j++) goto skip;
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	  if (pass==0) ++n;
	  else if (!--c) break;
	  ptr+=delimeter_length;
	  continue;
	}
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    skip:
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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)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;					/* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

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

  char *ptr=(char*) res->ptr();
  char *end=ptr+res->length();
  if (remove_length == 1)
  {
    char chr=(*remove_str)[0];
    while (ptr != end && *ptr == chr)
      ptr++;
  }
  else
  {
    const char *r_ptr=remove_str->ptr();
    end-=remove_length;
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    while (ptr <= end && !memcmp(ptr, r_ptr, remove_length))
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      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)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

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

  char *ptr=(char*) res->ptr();
  char *end=ptr+res->length();
#ifdef USE_MB
  char *p=ptr;
  register uint32 l;
#endif
  if (remove_length == 1)
  {
    char chr=(*remove_str)[0];
#ifdef USE_MB
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    if (use_mb(res->charset()))
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    {
      while (ptr < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l,p=ptr;
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	else ++ptr;
      }
      ptr=p;
    }
#endif
    while (ptr != end  && end[-1] == chr)
      end--;
  }
  else
  {
    const char *r_ptr=remove_str->ptr();
#ifdef USE_MB
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    if (use_mb(res->charset()))
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    {
  loop:
      while (ptr + remove_length < end)
      {
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	if ((l=my_ismbchar(res->charset(), ptr,end))) ptr+=l;
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	else ++ptr;
      }
      if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
      {
	end-=remove_length;
	ptr=p;
	goto loop;
      }
    }
    else
#endif /* USE_MB */
    {
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      while (ptr + remove_length <= end &&
	     !memcmp(end-remove_length, r_ptr, remove_length))
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	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)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res  =args[0]->val_str(str);
  if ((null_value=args[0]->null_value))
    return 0;					/* purecov: inspected */
  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),res->charset());
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  String *remove_str= (arg_count==2) ? args[1]->val_str(&tmp) : &remove;
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  uint remove_length;
  LINT_INIT(remove_length);

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

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

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


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/* Item_func_password */
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String *Item_func_password::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res= args[0]->val_str(str); 
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  if ((null_value=args[0]->null_value))
    return 0;
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  if (res->length() == 0)
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    return &my_empty_string;
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  make_scrambled_password(tmp_value, res->c_ptr());
  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH, res->charset());
  return str;
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}

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

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/* Item_func_old_password */

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String *Item_func_old_password::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res= args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
  if (res->length() == 0)
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    return &my_empty_string;
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  make_scrambled_password_323(tmp_value, res->c_ptr());
  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH_323, res->charset());
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  return str;
}

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

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

void Item_func_encode::fix_length_and_dec()
{
  max_length=args[0]->max_length;
  maybe_null=args[0]->maybe_null;
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  collation.set(&my_charset_bin);
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}

String *Item_func_encode::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  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());
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  res->set_charset(&my_charset_bin);
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  return res;
}

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

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

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String *Item_func_user::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  THD          *thd=current_thd;
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  CHARSET_INFO *cs= system_charset_info;
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  const char   *host= thd->host_or_ip;
  uint		res_length;

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

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


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


String *Item_func_soundex::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res  =args[0]->val_str(str);
  char last_ch,ch;
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  CHARSET_INFO *cs= collation.collation;
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  if ((null_value=args[0]->null_value))
    return 0; /* purecov: inspected */

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


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

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


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/*
  TODO: This needs to be fixed for multi-byte character set where numbers
  are stored in more than one byte
*/

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String *Item_func_format::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  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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  /* Here default_charset() is right as this is not an automatic conversion */
  str->set(nr,decimals, default_charset());
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  if (isnan(nr))
    return str;
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  str_length=str->length();
  if (nr < 0)
    str_length--;				// Don't count sign
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  /* We need this test to handle 'nan' values */
  if (str_length >= dec+4)
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  {
    char *tmp,*pos;
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    length= str->length()+(diff=(str_length- dec-1)/3);
    str= copy_if_not_alloced(&tmp_str,str,length);
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    str->length(length);
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    tmp= (char*) str->ptr()+length - dec-1;
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    for (pos= (char*) str->ptr()+length-1; pos != tmp; pos--)
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      pos[0]= pos[-(int) diff];
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    while (diff)
    {
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=pos[-(int) diff]; pos--;
      pos[0]=',';
      pos--;
      diff--;
    }
  }
  return str;
}


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void Item_func_format::print(String *str)
{
  str->append("format(", 7);
  args[0]->print(str);
  str->append(',');  
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  // my_charset_bin is good enough for numbers
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  char buffer[20];
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  String st(buffer, sizeof(buffer), &my_charset_bin);
  st.set((ulonglong)decimals, &my_charset_bin);
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  str->append(st);
  str->append(')');
}

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

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


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

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longlong Item_func_elt::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  uint tmp;
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  null_value=1;
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  if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count)
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    return 0;
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  longlong result= args[tmp]->val_int();
  null_value= args[tmp]->null_value;
1717
  return result;
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}

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String *Item_func_elt::val_str(String *str)
{
1723
  DBUG_ASSERT(fixed == 1);
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  uint tmp;
1725
  null_value=1;
1726
  if ((tmp=(uint) args[0]->val_int()) == 0 || tmp >= arg_count)
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    return NULL;
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  String *result= args[tmp]->val_str(str);
  if (result)
    result->set_charset(collation.collation);
  null_value= args[tmp]->null_value;
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  return result;
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}


1737
void Item_func_make_set::split_sum_func(THD *thd, Item **ref_pointer_array,
1738
					List<Item> &fields)
1739 1740
{
  if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
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    item->split_sum_func(thd, ref_pointer_array, fields);
1742 1743
  else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
  {
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    uint el= fields.elements;
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    Item *new_item= new Item_ref(ref_pointer_array + el, 0, item->name);
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    fields.push_front(item);
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    ref_pointer_array[el]= item;
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    thd->change_item_tree(&item, new_item);
1749
  }
1750
  Item_str_func::split_sum_func(thd, ref_pointer_array, fields);
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}


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void Item_func_make_set::fix_length_and_dec()
{
  max_length=arg_count-1;
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1758
  if (agg_arg_collations(collation, args, arg_count))
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    return;
  
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  for (uint i=0 ; i < arg_count ; i++)
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    max_length+=args[i]->max_length;
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  used_tables_cache|=	  item->used_tables();
  not_null_tables_cache&= item->not_null_tables();
  const_item_cache&=	  item->const_item();
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  with_sum_func= with_sum_func || item->with_sum_func;
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}


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


String *Item_func_make_set::val_str(String *str)
{
1782
  DBUG_ASSERT(fixed == 1);
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  ulonglong bits;
  bool first_found=0;
  Item **ptr=args;
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  String *result=&my_empty_string;
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  bits=item->val_int();
  if ((null_value=item->null_value))
    return NULL;

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

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


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void Item_func_make_set::print(String *str)
{
  str->append("make_set(", 9);
  item->print(str);
  if (arg_count)
  {
    str->append(',');
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    print_args(str, 0);
1841 1842 1843 1844 1845
  }
  str->append(')');
}


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String *Item_func_char::val_str(String *str)
{
1848
  DBUG_ASSERT(fixed == 1);
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  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
1855
      if (use_mb(collation.collation))
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      {
        if (num&0xFF000000L) {
           str->append((char)(num>>24));
           goto b2;
        } else if (num&0xFF0000L) {
b2:        str->append((char)(num>>16));
           goto b1;
1863
        } 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;
    }
1886 1887 1888 1889 1890
    if (tmp_value->alloc(length))
      return 0;
    (void) tmp_value->copy(*res);
    tmp_value->length(length);
    return tmp_value;
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  }
  res->length(length);
  return res;
}


void Item_func_repeat::fix_length_and_dec()
{
1899
  collation.set(args[0]->collation);
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  if (args[1]->const_item())
  {
    max_length=(long) (args[0]->max_length * args[1]->val_int());
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}

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

String *Item_func_repeat::val_str(String *str)
{
1923
  DBUG_ASSERT(fixed == 1);
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  uint length,tot_length;
  char *to;
  long count= (long) args[1]->val_int();
  String *res =args[0]->val_str(str);

  if (args[0]->null_value || args[1]->null_value)
    goto err;				// string and/or delim are null
  null_value=0;
  if (count <= 0)			// For nicer SQL code
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    return &my_empty_string;
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  if (count == 1)			// To avoid reallocs
    return res;
  length=res->length();
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  // Safe length check
  if (length > current_thd->variables.max_allowed_packet/count)
1939 1940 1941
  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_ALLOWED_PACKET_OVERFLOWED,
1942 1943
			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
			func_name(), current_thd->variables.max_allowed_packet);
1944 1945
    goto err;
  }
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  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()
{
1966
  if (collation.set(args[0]->collation, args[2]->collation))
1967
  {
1968
    my_coll_agg_error(args[0]->collation, args[2]->collation, func_name());
1969
    return;
1970 1971
  }
  
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  if (args[1]->const_item())
  {
1974
    uint32 length= (uint32) args[1]->val_int() * collation.collation->mbmaxlen;
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    max_length=max(args[0]->max_length,length);
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


String *Item_func_rpad::val_str(String *str)
{
1992
  DBUG_ASSERT(fixed == 1);
1993
  uint32 res_byte_length,res_char_length,pad_char_length,pad_byte_length;
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  char *to;
  const char *ptr_pad;
  int32 count= (int32) args[1]->val_int();
1997
  int32 byte_count= count * collation.collation->mbmaxlen;
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  String *res =args[0]->val_str(str);
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  String *rpad = args[2]->val_str(&rpad_str);
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  if (!res || args[1]->null_value || !rpad || count < 0)
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    goto err;
  null_value=0;
2004
  if (count <= (int32) (res_char_length=res->numchars()))
2005
  {						// String to pad is big enough
2006
    res->length(res->charpos(count));		// Shorten result if longer
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    return (res);
  }
2009
  pad_char_length= rpad->numchars();
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  if ((ulong) byte_count > current_thd->variables.max_allowed_packet)
  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_ALLOWED_PACKET_OVERFLOWED,
2014 2015
			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
			func_name(), current_thd->variables.max_allowed_packet);
2016 2017 2018
    goto err;
  }
  if(args[2]->null_value || !pad_char_length)
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    goto err;
2020 2021
  res_byte_length= res->length();	/* Must be done before alloc_buffer */
  if (!(res= alloc_buffer(res,str,&tmp_value,byte_count)))
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    goto err;

2024
  to= (char*) res->ptr()+res_byte_length;
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  ptr_pad=rpad->ptr();
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  pad_byte_length= rpad->length();
  count-= res_char_length;
  for ( ; (uint32) count > pad_char_length; count-= pad_char_length)
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  {
2030 2031
    memcpy(to,ptr_pad,pad_byte_length);
    to+= pad_byte_length;
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  }
2033 2034 2035 2036 2037 2038 2039
  if (count)
  {
    pad_byte_length= rpad->charpos(count);
    memcpy(to,ptr_pad,(size_t) pad_byte_length);
    to+= pad_byte_length;
  }
  res->length(to- (char*) res->ptr());
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  return (res);

 err:
  null_value=1;
  return 0;
}


void Item_func_lpad::fix_length_and_dec()
{
2050
  if (collation.set(args[0]->collation, args[2]->collation))
2051
  {
2052
    my_coll_agg_error(args[0]->collation, args[2]->collation, func_name());
2053
    return;
2054 2055
  }
  
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  if (args[1]->const_item())
  {
2058
    uint32 length= (uint32) args[1]->val_int() * collation.collation->mbmaxlen;
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    max_length=max(args[0]->max_length,length);
    if (max_length >= MAX_BLOB_WIDTH)
    {
      max_length=MAX_BLOB_WIDTH;
      maybe_null=1;
    }
  }
  else
  {
    max_length=MAX_BLOB_WIDTH;
    maybe_null=1;
  }
}


String *Item_func_lpad::val_str(String *str)
{
2076
  DBUG_ASSERT(fixed == 1);
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  uint32 res_char_length,pad_char_length;
2078
  ulong count= (long) args[1]->val_int(), byte_count;
2079 2080
  String *res= args[0]->val_str(&tmp_value);
  String *pad= args[2]->val_str(&lpad_str);
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2082
  if (!res || args[1]->null_value || !pad)
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    goto err;
2084

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  null_value=0;
2086 2087 2088 2089 2090 2091
  res_char_length= res->numchars();

  if (count <= res_char_length)
  {
    res->length(res->charpos(count));
    return res;
2092
  }
2093 2094 2095 2096
  
  pad_char_length= pad->numchars();
  byte_count= count * collation.collation->mbmaxlen;
  
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  if (byte_count > current_thd->variables.max_allowed_packet)
  {
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_ALLOWED_PACKET_OVERFLOWED,
2101 2102
			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
			func_name(), current_thd->variables.max_allowed_packet);
2103 2104 2105 2106
    goto err;
  }

  if (args[2]->null_value || !pad_char_length || str->alloc(byte_count))
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    goto err;
2108 2109 2110 2111 2112
  
  str->length(0);
  str->set_charset(collation.collation);
  count-= res_char_length;
  while (count >= pad_char_length)
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  {
2114 2115
    str->append(*pad);
    count-= pad_char_length;
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  }
2117
  if (count > 0)
2118 2119
    str->append(pad->ptr(), pad->charpos(count), collation.collation);

2120 2121 2122
  str->append(*res);
  null_value= 0;
  return str;
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2124 2125
err:
  null_value= 1;
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  return 0;
}


String *Item_func_conv::val_str(String *str)
{
2132
  DBUG_ASSERT(fixed == 1);
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  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();
2138
  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)
2149
    dec= my_strntoll(res->charset(),res->ptr(),res->length(),-from_base,&endptr,&err);
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  else
2151
    dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),from_base,&endptr,&err);
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  ptr= longlong2str(dec,ans,to_base);
2153
  if (str->copy(ans,(uint32) (ptr-ans), default_charset()))
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    return &my_empty_string;
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  return str;
}

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2159 2160
String *Item_func_conv_charset::val_str(String *str)
{
2161
  DBUG_ASSERT(fixed == 1);
2162
  String *arg= args[0]->val_str(str);
2163
  uint dummy_errors;
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  if (!arg)
  {
    null_value=1;
    return 0;
  }
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  null_value= str_value.copy(arg->ptr(),arg->length(),arg->charset(),
2170
                             conv_charset, &dummy_errors);
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  return null_value ? 0 : &str_value;
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}

void Item_func_conv_charset::fix_length_and_dec()
{
2176
  collation.set(conv_charset, DERIVATION_IMPLICIT);
2177
  max_length = args[0]->max_length*conv_charset->mbmaxlen;
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}

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void Item_func_conv_charset::print(String *str)
{
  str->append("convert(", 8);
  args[0]->print(str);
  str->append(" using ", 7);
  str->append(conv_charset->csname);
  str->append(')');
}
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String *Item_func_set_collation::val_str(String *str)
{
2191
  DBUG_ASSERT(fixed == 1);
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  str=args[0]->val_str(str);
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  if ((null_value=args[0]->null_value))
    return 0;
2195
  str->set_charset(collation.collation);
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  return str;
}

2199
void Item_func_set_collation::fix_length_and_dec()
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{
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  CHARSET_INFO *set_collation;
  const char *colname;
2203
  String tmp, *str= args[1]->val_str(&tmp);
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  colname= str->c_ptr();
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  if (colname == binary_keyword)
2206
    set_collation= get_charset_by_csname(args[0]->collation.collation->csname,
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					 MY_CS_BINSORT,MYF(0));
  else
2209 2210 2211 2212 2213 2214 2215
  {
    if (!(set_collation= get_charset_by_name(colname,MYF(0))))
    {
      my_error(ER_UNKNOWN_COLLATION, MYF(0), colname);
      return;
    }
  }
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2217 2218
  if (!set_collation || 
      !my_charset_same(args[0]->collation.collation,set_collation))
2219
  {
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    my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
2221
      colname,args[0]->collation.collation->csname);
2222
    return;
2223
  }
2224
  collation.set(set_collation, DERIVATION_EXPLICIT);
2225
  max_length= args[0]->max_length;
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}

2228

2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
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;
2241
  if (collation.collation != item_func_sc->collation.collation)
2242 2243 2244 2245 2246 2247 2248
    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;
}

2249 2250
String *Item_func_charset::val_str(String *str)
{
2251
  DBUG_ASSERT(fixed == 1);
2252
  String *res = args[0]->val_str(str);
2253
  uint dummy_errors;
2254

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  if ((null_value=(args[0]->null_value || !res->charset())))
    return 0;
  str->copy(res->charset()->csname,strlen(res->charset()->csname),
2258
	    &my_charset_latin1, collation.collation, &dummy_errors);
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  return str;
}

String *Item_func_collation::val_str(String *str)
{
2264
  DBUG_ASSERT(fixed == 1);
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  String *res = args[0]->val_str(str);
2266
  uint dummy_errors;
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2268 2269
  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, collation.collation, &dummy_errors);
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  return str;
}
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String *Item_func_hex::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  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()))
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      return &my_empty_string;			// End of memory
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    return str;
  }

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

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inline int hexchar_to_int(char c)
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{
  if (c <= '9' && c >= '0')
    return c-'0';
  c|=32;
  if (c <= 'f' && c >= 'a')
    return c-'a'+10;
  return -1;
}

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  /* Convert given hex string to a binary string */

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String *Item_func_unhex::val_str(String *str)
{
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  const char *from, *end;
  char *to;
  String *res;
  uint length;
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  DBUG_ASSERT(fixed == 1);
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  res= args[0]->val_str(str);
  if (!res || tmp_value.alloc(length= (1+res->length())/2))
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  {
    null_value=1;
    return 0;
  }
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  from= res->ptr();
  null_value= 0;
  tmp_value.length(length);
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  to= (char*) tmp_value.ptr();
  if (res->length() % 2)
  {
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    int hex_char;
    *to++= hex_char= hexchar_to_int(*from++);
    if ((null_value= (hex_char == -1)))
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      return 0;
  }
  for (end=res->ptr()+res->length(); from < end ; from+=2, to++)
  {
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    int hex_char;
    *to= (hex_char= hexchar_to_int(from[0])) << 4;
    if ((null_value= (hex_char == -1)))
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      return 0;
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    *to|= hex_char= hexchar_to_int(from[1]);
    if ((null_value= (hex_char == -1)))
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      return 0;
  }
  return &tmp_value;
}
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void Item_func_binary::print(String *str)
{
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  str->append("cast(", 5);
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  args[0]->print(str);
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  str->append(" as binary)", 11);
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}


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#include <my_dir.h>				// For my_stat

String *Item_load_file::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *file_name;
  File file;
  MY_STAT stat_info;
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  char path[FN_REFLEN];
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  DBUG_ENTER("load_file");

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  if (!(file_name= args[0]->val_str(str))
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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      || !(current_thd->master_access & FILE_ACL)
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#endif
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      )
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    goto err;
2392

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  (void) fn_format(path, file_name->c_ptr(), mysql_real_data_home, "",
		   MY_RELATIVE_PATH | MY_UNPACK_FILENAME);
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  if (!my_stat(path, &stat_info, MYF(MY_WME)))
    goto err;

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  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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  {
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    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
			ER_WARN_ALLOWED_PACKET_OVERFLOWED,
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			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
			func_name(), current_thd->variables.max_allowed_packet);
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    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)
{
2434
  DBUG_ASSERT(fixed == 1);
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  ulonglong the_set = (ulonglong) args[0]->val_int();
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  String yes_buf, *yes;
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  yes = args[1]->val_str(&yes_buf);
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  String no_buf, *no;
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  no = args[2]->val_str(&no_buf);
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  String *sep = NULL, sep_buf ;
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  uint num_set_values = 64;
  ulonglong mask = 0x1;
  str->length(0);

  /* Check if some argument is a NULL value */
  if (args[0]->null_value || args[1]->null_value || args[2]->null_value)
  {
    null_value=1;
    return 0;
  }
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  /*
    Arg count can only be 3, 4 or 5 here. This is guaranteed from the
    grammar for EXPORT_SET()
  */
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  switch(arg_count) {
  case 5:
    num_set_values = (uint) args[4]->val_int();
    if (num_set_values > 64)
      num_set_values=64;
    if (args[4]->null_value)
    {
      null_value=1;
      return 0;
    }
    /* Fall through */
  case 4:
    if (!(sep = args[3]->val_str(&sep_buf)))	// Only true if NULL
    {
      null_value=1;
      return 0;
    }
    break;
  case 3:
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    sep_buf.set(",", 1, default_charset());
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    sep = &sep_buf;
  }
  null_value=0;

  for (uint i = 0; i < num_set_values; i++, mask = (mask << 1))
  {
    if (the_set & mask)
      str->append(*yes);
    else
      str->append(*no);
2486
    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;
2497

2498
  if (agg_arg_collations(collation, args+1, min(4,arg_count)-1))
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    return;
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}

String* Item_func_inet_ntoa::val_str(String* str)
{
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  DBUG_ASSERT(fixed == 1);
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  uchar buf[8], *p;
  ulonglong n = (ulonglong) args[0]->val_int();
  char num[4];
2508

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  /*
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    We do not know if args[0] is NULL until we have called
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    some val function on it if args[0] is not a constant!
2512 2513

    Also return null if n > 255.255.255.255
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  */
2515
  if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
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    return 0;					// Null value
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  str->length(0);
2519
  int4store(buf,n);
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  /* Now we can assume little endian. */
2522

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  num[3]='.';
2524
  for (p=buf+4 ; p-- > buf ; )
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  {
    uint c = *p;
    uint n1,n2;					// Try to avoid divisions
    n1= c / 100;				// 100 digits
    c-= n1*100;
    n2= c / 10;					// 10 digits
    c-=n2*10;					// last digit
    num[0]=(char) n1+'0';
    num[1]=(char) n2+'0';
    num[2]=(char) c+'0';
    uint length=(n1 ? 4 : n2 ? 3 : 2);		// Remove pre-zero

    (void) str->append(num+4-length,length);
  }
  str->length(str->length()-1);			// Remove last '.';
  return str;
}
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2544
/*
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  QUOTE() function returns argument string in single quotes suitable for
  using in a SQL statement.

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

    RETURN VALUES
    str		Quoted string
    NULL	Argument to QUOTE() was NULL or out of memory.
2558
*/
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#define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7))

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String *Item_func_quote::val_str(String *str)
{
2564
  DBUG_ASSERT(fixed == 1);
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  /*
    Bit mask that has 1 for set for the position of the following characters:
    0, \, ' and ^Z
2568
  */
2569

2570
  static uchar escmask[32]=
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  {
    0x01, 0x00, 0x00, 0x04, 0x80, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  };
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2578 2579 2580 2581
  char *from, *to, *end, *start;
  String *arg= args[0]->val_str(str);
  uint arg_length, new_length;
  if (!arg)					// Null argument
2582
    goto null;
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  arg_length= arg->length();
  new_length= arg_length+2; /* for beginning and ending ' signs */
2585

2586
  for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
2587
    new_length+= get_esc_bit(escmask, (uchar) *from);
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2589 2590 2591 2592 2593
  /*
    We have to use realloc() instead of alloc() as we want to keep the
    old result in str
  */
  if (str->realloc(new_length))
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    goto null;
2595 2596 2597 2598 2599 2600

  /*
    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;
2601
  *to--= '\'';
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  for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
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  {
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    /*
      We can't use the bitmask here as we want to replace \O and ^Z with 0
      and Z
    */
    switch (*end)  {
    case 0:
      *to--= '0';
      *to=   '\\';
      break;
    case '\032':
      *to--= 'Z';
      *to=   '\\';
      break;
    case '\'':
    case '\\':
      *to--= *end;
      *to=   '\\';
      break;
    default:
      *to= *end;
      break;
    }
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  }
2627
  *to= '\'';
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  str->length(new_length);
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  str->set_charset(collation.collation);
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  null_value= 0;
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  return str;
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null:
  null_value= 1;
  return 0;
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}
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longlong Item_func_uncompressed_length::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res= args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  if (res->is_empty()) return 0;
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  /*
    res->ptr() using is safe because we have tested that string is not empty,
    res->c_ptr() is not used because:
      - we do not need \0 terminated string to get first 4 bytes
      - c_ptr() tests simbol after string end (uninitialiozed memory) which
        confuse valgrind
  */
  return uint4korr(res->ptr()) & 0x3FFFFFFF;
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}

longlong Item_func_crc32::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
2670
  return (longlong) crc32(0L, (uchar*)res->ptr(), res->length());
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}

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#ifdef HAVE_COMPRESS
2674
#include "zlib.h"
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String *Item_func_compress::val_str(String *str)
{
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  int err= Z_OK, code;
  ulong new_size;
  String *res;
  Byte *body;
  char *tmp, *last_char;
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  DBUG_ASSERT(fixed == 1);
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  if (!(res= args[0]->val_str(str)))
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  {
    null_value= 1;
    return 0;
  }
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  if (res->is_empty()) return res;

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  /*
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    Citation from zlib.h (comment for compress function):
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    Compresses the source buffer into the destination buffer.  sourceLen is
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    the byte length of the source buffer. Upon entry, destLen is the total
    size of the destination buffer, which must be at least 0.1% larger than
    sourceLen plus 12 bytes.
    We assume here that the buffer can't grow more than .25 %.
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  */
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  new_size= res->length() + res->length() / 5 + 12;
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  // Check new_size overflow: new_size <= res->length()
  if (((uint32) (new_size+5) <= res->length()) || 
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      buffer.realloc((uint32) new_size + 4 + 1))
  {
    null_value= 1;
    return 0;
  }
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  body= ((Byte*)buffer.ptr()) + 4;
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  // As far as we have checked res->is_empty() we can use ptr()
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  if ((err= compress(body, &new_size,
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		     (const Bytef*)res->ptr(), res->length())) != Z_OK)
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  {
    code= err==Z_MEM_ERROR ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_BUF_ERROR;
    push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code));
    null_value= 1;
    return 0;
  }
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  tmp= (char*)buffer.ptr(); // int4store is a macro; avoid side effects
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  int4store(tmp, res->length() & 0x3FFFFFFF);
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  /* This is to ensure that things works for CHAR fields, which trim ' ': */
  last_char= ((char*)body)+new_size-1;
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  if (*last_char == ' ')
  {
    *++last_char= '.';
    new_size++;
  }
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  buffer.length((uint32)new_size + 4);
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  return &buffer;
}

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String *Item_func_uncompress::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res= args[0]->val_str(str);
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  ulong new_size;
  int err;
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  uint code;
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  if (!res)
    goto err;
  if (res->is_empty())
    return res;

  new_size= uint4korr(res->ptr()) & 0x3FFFFFFF;
2753
  if (new_size > current_thd->variables.max_allowed_packet)
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  {
    push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,
			ER_TOO_BIG_FOR_UNCOMPRESS,
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			ER(ER_TOO_BIG_FOR_UNCOMPRESS),
                        current_thd->variables.max_allowed_packet);
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    goto err;
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  }
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  if (buffer.realloc((uint32)new_size))
    goto err;
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2764 2765
  if ((err= uncompress((Byte*)buffer.ptr(), &new_size,
		       ((const Bytef*)res->ptr())+4,res->length())) == Z_OK)
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  {
2767
    buffer.length((uint32) new_size);
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    return &buffer;
  }
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  code= ((err == Z_BUF_ERROR) ? ER_ZLIB_Z_BUF_ERROR :
	 ((err == Z_MEM_ERROR) ? ER_ZLIB_Z_MEM_ERROR : ER_ZLIB_Z_DATA_ERROR));
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  push_warning(current_thd,MYSQL_ERROR::WARN_LEVEL_ERROR,code,ER(code));
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err:
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  null_value= 1;
  return 0;
}
#endif
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/*
  UUID, as in
    DCE 1.1: Remote Procedure Call,
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    Open Group Technical Standard Document Number C706, October 1997,
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    (supersedes C309 DCE: Remote Procedure Call 8/1994,
    which was basis for ISO/IEC 11578:1996 specification)
*/

static struct rand_struct uuid_rand;
static uint nanoseq;
static ulonglong uuid_time=0;
static char clock_seq_and_node_str[]="-0000-000000000000";

/* number of 100-nanosecond intervals between
   1582-10-15 00:00:00.00 and 1970-01-01 00:00:00.00 */
#define UUID_TIME_OFFSET ((ulonglong) 141427 * 24 * 60 * 60 * 1000 * 10 )

#define UUID_VERSION      0x1000
#define UUID_VARIANT      0x8000

static void tohex(char *to, uint from, uint len)
{
  to+= len;
  while (len--)
  {
2806
    *--to= _dig_vec_lower[from & 15];
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    from >>= 4;
  }
}

static void set_clock_seq_str()
{
  uint16 clock_seq= ((uint)(my_rnd(&uuid_rand)*16383)) | UUID_VARIANT;
  tohex(clock_seq_and_node_str+1, clock_seq, 4);
  nanoseq= 0;
}

String *Item_func_uuid::val_str(String *str)
{
2820
  DBUG_ASSERT(fixed == 1);
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  char *s;
  pthread_mutex_lock(&LOCK_uuid_generator);
  if (! uuid_time) /* first UUID() call. initializing data */
  {
    ulong tmp=sql_rnd_with_mutex();
    uchar mac[6];
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    int i;
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    if (my_gethwaddr(mac))
    {
      /*
        generating random "hardware addr"
        and because specs explicitly specify that it should NOT correlate
        with a clock_seq value (initialized random below), we use a separate
        randominit() here
      */
      randominit(&uuid_rand, tmp + (ulong)current_thd, tmp + query_id);
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      for (i=0; i < (int)sizeof(mac); i++)
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        mac[i]=(uchar)(my_rnd(&uuid_rand)*255);
    }
    s=clock_seq_and_node_str+sizeof(clock_seq_and_node_str)-1;
    for (i=sizeof(mac)-1 ; i>=0 ; i--)
    {
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      *--s=_dig_vec_lower[mac[i] & 15];
      *--s=_dig_vec_lower[mac[i] >> 4];
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    }
    randominit(&uuid_rand, tmp + (ulong)start_time, tmp + bytes_sent);
    set_clock_seq_str();
  }

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  ulonglong tv=my_getsystime() + UUID_TIME_OFFSET + nanoseq;
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  if (unlikely(tv < uuid_time))
    set_clock_seq_str();
  else
  if (unlikely(tv == uuid_time))
  { /* special protection from low-res system clocks */
    nanoseq++;
    tv++;
  }
  else
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  {
    if (nanoseq)
    {
      tv-=nanoseq;
      nanoseq=0;
    }
    DBUG_ASSERT(tv > uuid_time);
  }
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  uuid_time=tv;
  pthread_mutex_unlock(&LOCK_uuid_generator);

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  uint32 time_low=            (uint32) (tv & 0xFFFFFFFF);
  uint16 time_mid=            (uint16) ((tv >> 32) & 0xFFFF);
  uint16 time_hi_and_version= (uint16) ((tv >> 48) | UUID_VERSION);
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  str->realloc(UUID_LENGTH+1);
  str->length(UUID_LENGTH);
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  str->set_charset(system_charset_info);
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  s=(char *) str->ptr();
  s[8]=s[13]='-';
  tohex(s, time_low, 8);
  tohex(s+9, time_mid, 4);
  tohex(s+14, time_hi_and_version, 4);
  strmov(s+18, clock_seq_and_node_str);
  return str;
}