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mariadb/sql/item_strfunc.cc
unknown 8ccfad7636 Fix for a bug #7495 
mysql-test/r/func_str.result:
  result for test case for a bug in QUOTE() (Bug #7495)
mysql-test/t/func_str.test:
  test case for a bug in QUOTE() (Bug #7495)
sql/item_strfunc.cc:
  a better fix for a QUOTE() bug (Bug #7495)
2004-12-23 21:08:54 +02:00

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54 KiB
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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.
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.
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
** (This shouldn't be needed)
*/
#ifdef __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
#include "sql_acl.h"
#include <m_ctype.h>
#ifdef HAVE_OPENSSL
#include <openssl/des.h>
#endif /* HAVE_OPENSSL */
#include "md5.h"
#include "sha1.h"
#include "my_aes.h"
String empty_string("");
uint nr_of_decimals(const char *str)
{
if ((str=strchr(str,'.')))
{
const char *start= ++str;
for (; isdigit(*str) ; str++) ;
return (uint) (str-start);
}
return 0;
}
double Item_str_func::val()
{
String *res;
res=val_str(&str_value);
return res ? atof(res->c_ptr()) : 0.0;
}
longlong Item_str_func::val_int()
{
String *res;
res=val_str(&str_value);
return res ? strtoll(res->c_ptr(),NULL,10) : (longlong) 0;
}
String *Item_func_md5::val_str(String *str)
{
String * sptr= args[0]->val_str(str);
if (sptr)
{
my_MD5_CTX context;
unsigned char digest[16];
null_value=0;
my_MD5Init (&context);
my_MD5Update (&context,(unsigned char *) sptr->ptr(), sptr->length());
my_MD5Final (digest, &context);
if (str->alloc(32)) // Ensure that memory is free
{
null_value=1;
return 0;
}
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;
}
String *Item_func_sha::val_str(String *str)
{
String * sptr= args[0]->val_str(str);
if (sptr) /* If we got value different from NULL */
{
SHA1_CONTEXT context; /* Context used to generate SHA1 hash */
/* Temporary buffer to store 160bit digest */
uint8 digest[SHA1_HASH_SIZE];
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());
/* Ensure that memory is free and we got result */
if (!( str->alloc(SHA1_HASH_SIZE*2) || (sha1_result(&context,digest))))
{
sprintf((char *) str->ptr(),
"%02x%02x%02x%02x%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],
digest[16], digest[17], digest[18], digest[19]);
str->length((uint) SHA1_HASH_SIZE*2);
null_value=0;
return str;
}
}
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
}
/* Implementation of AES encryption routines */
String *Item_func_aes_encrypt::val_str(String *str)
{
char key_buff[80];
String tmp_key_value(key_buff, sizeof(key_buff));
String *sptr= args[0]->val_str(str); // String to encrypt
String *key= args[1]->val_str(&tmp_key_value); // key
int aes_length;
if (sptr && key) // we need both arguments to be not NULL
{
null_value=0;
aes_length=my_aes_get_size(sptr->length()); // Calculate result length
if (!str_value.alloc(aes_length)) // Ensure that memory is free
{
// finally encrypt directly to allocated buffer.
if (my_aes_encrypt(sptr->ptr(),sptr->length(), (char*) str_value.ptr(),
key->ptr(), key->length()) == aes_length)
{
// We got the expected result length
str_value.length((uint) aes_length);
return &str_value;
}
}
}
null_value=1;
return 0;
}
void Item_func_aes_encrypt::fix_length_and_dec()
{
max_length=my_aes_get_size(args[0]->max_length);
}
String *Item_func_aes_decrypt::val_str(String *str)
{
char key_buff[80];
String tmp_key_value(key_buff, sizeof(key_buff)), *sptr, *key;
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
{
null_value=0;
if (!str_value.alloc(sptr->length())) // Ensure that memory is free
{
// finally decrypt directly to allocated buffer.
int length;
length=my_aes_decrypt(sptr->ptr(), sptr->length(),
(char*) str_value.ptr(),
key->ptr(), key->length());
if (length >= 0) // if we got correct data data
{
str_value.length((uint) length);
DBUG_RETURN(&str_value);
}
}
}
// Bad parameters. No memory or bad data will all go here
null_value=1;
DBUG_RETURN(0);
}
void Item_func_aes_decrypt::fix_length_and_dec()
{
max_length=args[0]->max_length;
}
/*
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.
*/
String *Item_func_concat::val_str(String *str)
{
String *res,*res2,*use_as_buff;
uint i;
null_value=0;
if (!(res=args[0]->val_str(str)))
goto null;
use_as_buff= &tmp_value;
for (i=1 ; i < arg_count ; i++)
{
if (res->length() == 0)
{
if (!(res=args[i]->val_str(str)))
goto null;
}
else
{
if (!(res2=args[i]->val_str(use_as_buff)))
goto null;
if (res2->length() == 0)
continue;
if (res->length()+res2->length() >
current_thd->variables.max_allowed_packet)
goto null; // Error check
if (res->alloced_length() >= res->length()+res2->length())
{ // Use old buffer
res->append(*res2);
}
else if (str->alloced_length() >= res->length()+res2->length())
{
if (str == res2)
str->replace(0,0,*res);
else
{
str->copy(*res);
str->append(*res2);
}
res=str;
}
else if (res == &tmp_value)
{
if (res->append(*res2)) // Must be a blob
goto null;
}
else if (res2 == &tmp_value)
{ // This can happend only 1 time
if (tmp_value.replace(0,0,*res))
goto null;
res= &tmp_value;
use_as_buff=str; // Put next arg here
}
else if (tmp_value.is_alloced() && res2->ptr() >= tmp_value.ptr() &&
res2->ptr() <= tmp_value.ptr() + tmp_value.alloced_length())
{
/*
This happens really seldom:
In this case res2 is sub string of tmp_value. We will
now work in place in tmp_value to set it to res | res2
*/
/* Chop the last characters in tmp_value that isn't in res2 */
tmp_value.length((uint32) (res2->ptr() - tmp_value.ptr()) +
res2->length());
/* Place res2 at start of tmp_value, remove chars before res2 */
if (tmp_value.replace(0,(uint32) (res2->ptr() - tmp_value.ptr()),
*res))
goto null;
res= &tmp_value;
use_as_buff=str; // Put next arg here
}
else
{ // Two big const strings
if (tmp_value.alloc(max_length) ||
tmp_value.copy(*res) ||
tmp_value.append(*res2))
goto null;
res= &tmp_value;
use_as_buff=str;
}
}
}
return res;
null:
null_value=1;
return 0;
}
void Item_func_concat::fix_length_and_dec()
{
max_length=0;
for (uint i=0 ; i < arg_count ; i++)
max_length+=args[i]->max_length;
if (max_length > MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
/*
Function des_encrypt() by tonu@spam.ee & monty
Works only if compiled with OpenSSL library support.
This returns a binary string where first character is CHAR(128 | key-number).
If one uses a string key key_number is 127.
Encryption result is longer than original by formula:
new_length= org_length + (8-(org_length % 8))+1
*/
String *Item_func_des_encrypt::val_str(String *str)
{
#ifdef HAVE_OPENSSL
DES_cblock ivec;
struct st_des_keyblock keyblock;
struct st_des_keyschedule keyschedule;
const char *append_str="********";
uint key_number, res_length, tail;
String *res= args[0]->val_str(str);
if ((null_value=args[0]->null_value))
return 0;
if ((res_length=res->length()) == 0)
return &empty_string;
if (arg_count == 1)
{
/* 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));
}
else if (args[1]->result_type() == INT_RESULT)
{
key_number= (uint) args[1]->val_int();
if (key_number > 9)
goto error;
VOID(pthread_mutex_lock(&LOCK_des_key_file));
keyschedule= des_keyschedule[key_number];
VOID(pthread_mutex_unlock(&LOCK_des_key_file));
}
else
{
String *keystr=args[1]->val_str(&tmp_value);
if (!keystr)
goto error;
key_number=127; // User key string
/* We make good 24-byte (168 bit) key from given plaintext key with MD5 */
bzero((char*) &ivec,sizeof(ivec));
EVP_BytesToKey(EVP_des_ede3_cbc(),EVP_md5(),NULL,
(uchar*) keystr->ptr(), (int) keystr->length(),
1, (uchar*) &keyblock,ivec);
DES_set_key_unchecked(&keyblock.key1,&keyschedule.ks1);
DES_set_key_unchecked(&keyblock.key2,&keyschedule.ks2);
DES_set_key_unchecked(&keyblock.key3,&keyschedule.ks3);
}
/*
The problem: DES algorithm requires original data to be in 8-bytes
chunks. Missing bytes get filled with '*'s and result of encryption
can be up to 8 bytes longer than original string. When decrypted,
we do not know the size of original string :(
We add one byte with value 0x1..0x8 as the last byte of the padded
string marking change of string length.
*/
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))
goto error;
(*res)[res_length-1]=tail; // save extra length
tmp_value.length(res_length+1);
tmp_value[0]=(char) (128 | key_number);
// Real encryption
bzero((char*) &ivec,sizeof(ivec));
DES_ede3_cbc_encrypt((const uchar*) (res->ptr()),
(uchar*) (tmp_value.ptr()+1),
res_length,
&keyschedule.ks1,
&keyschedule.ks2,
&keyschedule.ks3,
&ivec, TRUE);
return &tmp_value;
error:
#endif /* HAVE_OPENSSL */
null_value=1;
return 0;
}
String *Item_func_des_decrypt::val_str(String *str)
{
#ifdef HAVE_OPENSSL
DES_key_schedule ks1, ks2, ks3;
DES_cblock ivec;
struct st_des_keyblock keyblock;
struct st_des_keyschedule keyschedule;
String *res= args[0]->val_str(str);
uint length=res->length(),tail;
if ((null_value=args[0]->null_value))
return 0;
length=res->length();
if (length < 9 || (length % 8) != 1 || !((*res)[0] & 128))
return res; // Skip decryption if not encrypted
if (arg_count == 1) // If automatic uncompression
{
uint key_number=(uint) (*res)[0] & 127;
// Check if automatic key and that we have privilege to uncompress using it
if (!(current_thd->master_access & SUPER_ACL) || key_number > 9)
goto error;
VOID(pthread_mutex_lock(&LOCK_des_key_file));
keyschedule= des_keyschedule[key_number];
VOID(pthread_mutex_unlock(&LOCK_des_key_file));
}
else
{
// We make good 24-byte (168 bit) key from given plaintext key with MD5
String *keystr=args[1]->val_str(&tmp_value);
if (!keystr)
goto error;
bzero((char*) &ivec,sizeof(ivec));
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
DES_set_key_unchecked(&keyblock.key1,&keyschedule.ks1);
DES_set_key_unchecked(&keyblock.key2,&keyschedule.ks2);
DES_set_key_unchecked(&keyblock.key3,&keyschedule.ks3);
}
if (tmp_value.alloc(length-1))
goto error;
bzero((char*) &ivec,sizeof(ivec));
DES_ede3_cbc_encrypt((const uchar*) res->ptr()+1,
(uchar*) (tmp_value.ptr()),
length-1,
&keyschedule.ks1,
&keyschedule.ks2,
&keyschedule.ks3,
&ivec, FALSE);
/* Restore old length of key */
if ((tail=(uint) (uchar) tmp_value[length-2]) > 8)
goto error; // Wrong key
tmp_value.length(length-1-tail);
return &tmp_value;
error:
#endif /* HAVE_OPENSSL */
null_value=1;
return 0;
}
/*
concat with separator. First arg is the separator
concat_ws takes at least two arguments.
*/
String *Item_func_concat_ws::val_str(String *str)
{
char tmp_str_buff[10];
String tmp_sep_str(tmp_str_buff, sizeof(tmp_str_buff)),
*sep_str, *res, *res2,*use_as_buff;
uint i;
null_value=0;
if (!(sep_str= separator->val_str(&tmp_sep_str)))
goto null;
use_as_buff= &tmp_value;
str->length(0); // QQ; Should be removed
res=str;
// Skip until non-null argument is found.
// If not, return the empty string
for (i=0; i < arg_count; i++)
if ((res= args[i]->val_str(str)))
break;
if (i == arg_count)
return &empty_string;
for (i++; i < arg_count ; i++)
{
if (!(res2= args[i]->val_str(use_as_buff)))
continue; // Skip NULL
if (res->length() + sep_str->length() + res2->length() >
current_thd->variables.max_allowed_packet)
goto null; // Error check
if (res->alloced_length() >=
res->length() + sep_str->length() + res2->length())
{ // Use old buffer
res->append(*sep_str); // res->length() > 0 always
res->append(*res2);
}
else if (str->alloced_length() >=
res->length() + sep_str->length() + res2->length())
{
/* 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);
}
res=str;
use_as_buff= &tmp_value;
}
else if (res == &tmp_value)
{
if (res->append(*sep_str) || res->append(*res2))
goto null; // Must be a blob
}
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
}
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 | sep_str | 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) ||
tmp_value.replace(res->length(),0, *sep_str))
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;
}
}
return res;
null:
null_value=1;
return 0;
}
void Item_func_concat_ws::split_sum_func(List<Item> &fields)
{
if (separator->with_sum_func && separator->type() != SUM_FUNC_ITEM)
separator->split_sum_func(fields);
else if (separator->used_tables() || separator->type() == SUM_FUNC_ITEM)
{
fields.push_front(separator);
separator= new Item_ref((Item**) fields.head_ref(), 0, separator->name);
}
Item_str_func::split_sum_func(fields);
}
void Item_func_concat_ws::fix_length_and_dec()
{
max_length=separator->max_length*(arg_count-1);
for (uint i=0 ; i < arg_count ; i++)
max_length+=args[i]->max_length;
if (max_length > MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
used_tables_cache|= separator->used_tables();
not_null_tables_cache&= separator->not_null_tables();
const_item_cache&= separator->const_item();
with_sum_func= with_sum_func || separator->with_sum_func;
}
void Item_func_concat_ws::update_used_tables()
{
Item_func::update_used_tables();
separator->update_used_tables();
used_tables_cache|=separator->used_tables();
const_item_cache&=separator->const_item();
}
String *Item_func_reverse::val_str(String *str)
{
String *res = args[0]->val_str(str);
char *ptr,*end;
if ((null_value=args[0]->null_value))
return 0;
/* An empty string is a special case as the string pointer may be null */
if (!res->length())
return &empty_string;
res=copy_if_not_alloced(str,res,res->length());
ptr = (char *) res->ptr();
end=ptr+res->length();
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
String tmpstr;
tmpstr.copy(*res);
char *tmp = (char *) tmpstr.ptr() + tmpstr.length();
register uint32 l;
while (ptr < end)
{
if ((l=my_ismbchar(default_charset_info, ptr,end)))
tmp-=l, memcpy(tmp,ptr,l), ptr+=l;
else
*--tmp=*ptr++;
}
memcpy((char *) res->ptr(),(char *) tmpstr.ptr(), res->length());
}
else
#endif /* USE_MB */
{
char tmp;
while (ptr < end)
{
tmp=*ptr;
*ptr++=*--end;
*end=tmp;
}
}
return res;
}
void Item_func_reverse::fix_length_and_dec()
{
max_length = args[0]->max_length;
}
/*
** Replace all occurences of string2 in string1 with string3.
** Don't reallocate val_str() if not needed
*/
/* TODO: Fix that this works with binary strings when using USE_MB */
String *Item_func_replace::val_str(String *str)
{
String *res,*res2,*res3;
int offset;
uint from_length,to_length;
bool alloced=0;
#ifdef USE_MB
const char *ptr,*end,*strend,*search,*search_end;
register uint32 l;
bool binary_str = (args[0]->binary || args[1]->binary ||
!use_mb(default_charset_info));
#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;
if (res2->length() == 0)
return res;
#ifndef USE_MB
if ((offset=res->strstr(*res2)) < 0)
return res;
#else
offset=0;
if (binary_str && (offset=res->strstr(*res2)) < 0)
return res;
#endif
if (!(res3=args[2]->val_str(&tmp_value2)))
goto null;
from_length= res2->length();
to_length= res3->length();
#ifdef USE_MB
if (!binary_str)
{
search=res2->ptr();
search_end=search+from_length;
redo:
ptr=res->ptr()+offset;
strend=res->ptr()+res->length();
end=strend-from_length+1;
while (ptr < end)
{
if (*ptr == *search)
{
register char *i,*j;
i=(char*) ptr+1; j=(char*) search+1;
while (j != search_end)
if (*i++ != *j++) goto skipp;
offset= (int) (ptr-res->ptr());
if (res->length()-from_length + to_length >
current_thd->variables.max_allowed_packet)
goto null;
if (!alloced)
{
alloced=1;
res=copy_if_not_alloced(str,res,res->length()+to_length);
}
res->replace((uint) offset,from_length,*res3);
offset+=(int) to_length;
goto redo;
}
skipp:
if ((l=my_ismbchar(default_charset_info, ptr,strend))) ptr+=l;
else ++ptr;
}
}
else
#endif /* USE_MB */
do
{
if (res->length()-from_length + to_length >
current_thd->variables.max_allowed_packet)
goto null;
if (!alloced)
{
alloced=1;
res=copy_if_not_alloced(str,res,res->length()+to_length);
}
res->replace((uint) offset,from_length,*res3);
offset+=(int) to_length;
}
while ((offset=res->strstr(*res2,(uint) offset)) >= 0);
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
uint max_substrs= max_length/args[1]->max_length;
max_length+= max_substrs * (uint)diff;
}
if (max_length > MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
String *Item_func_insert::val_str(String *str)
{
String *res,*res2;
uint start,length;
null_value=0;
res=args[0]->val_str(str);
res2=args[3]->val_str(&tmp_value);
start=(uint) args[1]->val_int()-1;
length=(uint) args[2]->val_int();
if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
args[3]->null_value)
goto null; /* purecov: inspected */
#ifdef USE_MB
if (use_mb(default_charset_info) && !args[0]->binary)
{
start=res->charpos(start);
length=res->charpos(length,start);
}
#endif
if (start > res->length()+1)
return res; // Wrong param; skip insert
if (length > res->length()-start)
length=res->length()-start;
if (res->length() - length + res2->length() >
current_thd->variables.max_allowed_packet)
goto null; // OOM check
res=copy_if_not_alloced(str,res,res->length());
res->replace(start,length,*res2);
return res;
null:
null_value=1;
return 0;
}
void Item_func_insert::fix_length_and_dec()
{
max_length=args[0]->max_length+args[3]->max_length;
if (max_length > MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
String *Item_func_lcase::val_str(String *str)
{
String *res;
if (!(res=args[0]->val_str(str)))
{
null_value=1; /* purecov: inspected */
return 0; /* purecov: inspected */
}
null_value=0;
res=copy_if_not_alloced(str,res,res->length());
res->casedn();
return res;
}
String *Item_func_ucase::val_str(String *str)
{
String *res;
if (!(res=args[0]->val_str(str)))
{
null_value=1; /* purecov: inspected */
return 0; /* purecov: inspected */
}
null_value=0;
res=copy_if_not_alloced(str,res,res->length());
res->caseup();
return res;
}
String *Item_func_left::val_str(String *str)
{
String *res =args[0]->val_str(str);
long length =(long) args[1]->val_int();
if ((null_value=args[0]->null_value))
return 0;
if (length <= 0)
return &empty_string;
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
length = res->charpos(length);
#endif
if (res->length() > (ulong) length)
{ // Safe even if const arg
if (!res->alloced_length())
{ // Don't change const str
str_value= *res; // Not malloced string
res= &str_value;
}
res->length((uint) length);
}
return res;
}
void Item_str_func::left_right_max_length()
{
max_length=args[0]->max_length;
if (args[1]->const_item())
{
int length=(int) args[1]->val_int()*default_charset_info->mbmaxlen;
if (length <= 0)
max_length=0;
else
set_if_smaller(max_length,(uint) length);
}
}
void Item_func_left::fix_length_and_dec()
{
left_right_max_length();
}
String *Item_func_right::val_str(String *str)
{
String *res =args[0]->val_str(str);
long length =(long) args[1]->val_int();
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
if (length <= 0)
return &empty_string; /* purecov: inspected */
if (res->length() <= (uint) length)
return res; /* purecov: inspected */
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
uint start=res->numchars()-(uint) length;
if (start<=0) return res;
start=res->charpos(start);
tmp_value.set(*res,start,res->length()-start);
}
else
#endif
{
tmp_value.set(*res,(res->length()- (uint) length),(uint) length);
}
return &tmp_value;
}
void Item_func_right::fix_length_and_dec()
{
left_right_max_length();
}
String *Item_func_substr::val_str(String *str)
{
String *res = args[0]->val_str(str);
int32 start = (int32) args[1]->val_int()-1;
int32 length = arg_count == 3 ? (int32) args[2]->val_int() : INT_MAX32;
int32 tmp_length;
if ((null_value=(args[0]->null_value || args[1]->null_value ||
(arg_count == 3 && args[2]->null_value))))
return 0; /* purecov: inspected */
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
start=res->charpos(start);
length=res->charpos(length,start);
}
#endif
if (start < 0 || (uint) start+1 > res->length() || length <= 0)
return &empty_string;
tmp_length=(int32) res->length()-start;
length=min(length,tmp_length);
if (!start && res->length() == (uint) length)
return res;
tmp_value.set(*res,(uint) start,(uint) length);
return &tmp_value;
}
void Item_func_substr::fix_length_and_dec()
{
max_length=args[0]->max_length;
if (args[1]->const_item())
{
int32 start=(int32) args[1]->val_int()-1;
if (start < 0 || start >= (int32) max_length)
max_length=0; /* purecov: inspected */
else
max_length-= (uint) start;
}
if (arg_count == 3 && args[2]->const_item())
{
int32 length= (int32) args[2]->val_int() * default_charset_info->mbmaxlen;
if (length <= 0)
max_length=0; /* purecov: inspected */
else
set_if_smaller(max_length,(uint) length);
}
}
String *Item_func_substr_index::val_str(String *str)
{
String *res =args[0]->val_str(str);
String *delimeter =args[1]->val_str(&tmp_value);
int32 count = (int32) args[2]->val_int();
uint offset;
if (args[0]->null_value || args[1]->null_value || args[2]->null_value)
{ // string and/or delim are null
null_value=1;
return 0;
}
null_value=0;
uint delimeter_length=delimeter->length();
if (!res->length() || !delimeter_length || !count)
return &empty_string; // Wrong parameters
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
const char *ptr=res->ptr();
const char *strend = ptr+res->length();
const char *end=strend-delimeter_length+1;
const char *search=delimeter->ptr();
const char *search_end=search+delimeter_length;
int32 n=0,c=count,pass;
register uint32 l;
for (pass=(count>0);pass<2;++pass)
{
while (ptr < end)
{
if (*ptr == *search)
{
register char *i,*j;
i=(char*) ptr+1; j=(char*) search+1;
while (j != search_end)
if (*i++ != *j++) goto skipp;
if (pass==0) ++n;
else if (!--c) break;
ptr+=delimeter_length;
continue;
}
skipp:
if ((l=my_ismbchar(default_charset_info, ptr,strend))) ptr+=l;
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 */
{
tmp_value.set(*res,0,(ulong) (ptr-res->ptr()));
}
else /* return right part */
{
ptr+=delimeter_length;
tmp_value.set(*res,(ulong) (ptr-res->ptr()), (ulong) (strend-ptr));
}
}
}
}
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
for (offset=res->length() ; ; offset-=delimeter_length-1)
{
if ((int) (offset=res->strrstr(*delimeter,offset)) < 0)
return res; // Didn't find, return org string
if (!++count)
{
offset+=delimeter_length;
tmp_value.set(*res,offset,res->length()- offset);
break;
}
}
}
}
return (&tmp_value);
}
/*
** The trim functions are extension to ANSI SQL because they trim substrings
** They ltrim() and rtrim() functions are optimized for 1 byte strings
** They also return the original string if possible, else they return
** a substring that points at the original string.
*/
String *Item_func_ltrim::val_str(String *str)
{
String *res =args[0]->val_str(str);
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff));
String *remove_str=args[1]->val_str(&tmp);
uint remove_length;
LINT_INIT(remove_length);
if (!remove_str || (remove_length=remove_str->length()) == 0 ||
remove_length > res->length())
return res;
char *ptr=(char*) res->ptr();
char *end=ptr+res->length();
if (remove_length == 1)
{
char chr=(*remove_str)[0];
while (ptr != end && *ptr == chr)
ptr++;
}
else
{
const char *r_ptr=remove_str->ptr();
end-=remove_length;
while (ptr <= end && !memcmp(ptr, r_ptr, remove_length))
ptr+=remove_length;
end+=remove_length;
}
if (ptr == res->ptr())
return res;
tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr));
return &tmp_value;
}
String *Item_func_rtrim::val_str(String *str)
{
String *res =args[0]->val_str(str);
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff));
String *remove_str=args[1]->val_str(&tmp);
uint remove_length;
LINT_INIT(remove_length);
if (!remove_str || (remove_length=remove_str->length()) == 0 ||
remove_length > res->length())
return res;
char *ptr=(char*) res->ptr();
char *end=ptr+res->length();
#ifdef USE_MB
char *p=ptr;
register uint32 l;
#endif
if (remove_length == 1)
{
char chr=(*remove_str)[0];
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
while (ptr < end)
{
if ((l=my_ismbchar(default_charset_info, ptr,end))) ptr+=l,p=ptr;
else ++ptr;
}
ptr=p;
}
#endif
while (ptr != end && end[-1] == chr)
end--;
}
else
{
const char *r_ptr=remove_str->ptr();
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
loop:
while (ptr + remove_length < end)
{
if ((l=my_ismbchar(default_charset_info, ptr,end))) ptr+=l;
else ++ptr;
}
if (ptr + remove_length == end && !memcmp(ptr,r_ptr,remove_length))
{
end-=remove_length;
ptr=p;
goto loop;
}
}
else
#endif /* USE_MB */
{
while (ptr + remove_length <= end &&
!memcmp(end-remove_length, r_ptr, remove_length))
end-=remove_length;
}
}
if (end == res->ptr()+res->length())
return res;
tmp_value.set(*res,0,(uint) (end-res->ptr()));
return &tmp_value;
}
String *Item_func_trim::val_str(String *str)
{
String *res =args[0]->val_str(str);
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
char buff[MAX_FIELD_WIDTH];
String tmp(buff,sizeof(buff));
String *remove_str=args[1]->val_str(&tmp);
uint remove_length;
LINT_INIT(remove_length);
if (!remove_str || (remove_length=remove_str->length()) == 0 ||
remove_length > res->length())
return res;
char *ptr=(char*) res->ptr();
char *end=ptr+res->length();
const char *r_ptr=remove_str->ptr();
while (ptr+remove_length <= end && !memcmp(ptr,r_ptr,remove_length))
ptr+=remove_length;
#ifdef USE_MB
if (use_mb(default_charset_info) && !binary)
{
char *p=ptr;
register uint32 l;
loop:
while (ptr + remove_length < end)
{
if ((l=my_ismbchar(default_charset_info, ptr,end))) ptr+=l;
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 */
{
while (ptr + remove_length <= end &&
!memcmp(end-remove_length,r_ptr,remove_length))
end-=remove_length;
}
if (ptr == res->ptr() && end == ptr+res->length())
return res;
tmp_value.set(*res,(uint) (ptr - res->ptr()),(uint) (end-ptr));
return &tmp_value;
}
String *Item_func_password::val_str(String *str)
{
String *res =args[0]->val_str(str);
if ((null_value=args[0]->null_value))
return 0;
if (res->length() == 0)
return &empty_string;
make_scrambled_password(tmp_value,res->c_ptr());
str->set(tmp_value,16);
return str;
}
#define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.')
String *Item_func_encrypt::val_str(String *str)
{
String *res =args[0]->val_str(str);
#ifdef HAVE_CRYPT
char salt[3],*salt_ptr;
if ((null_value=args[0]->null_value))
return 0;
if (res->length() == 0)
return &empty_string;
if (arg_count == 1)
{ // generate random salt
time_t timestamp=current_thd->query_start();
salt[0] = bin_to_ascii( (ulong) timestamp & 0x3f);
salt[1] = bin_to_ascii(( (ulong) timestamp >> 5) & 0x3f);
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);
str->set(tmp,(uint) strlen(tmp));
str->copy();
pthread_mutex_unlock(&LOCK_crypt);
return str;
#else
null_value=1;
return 0;
#endif /* HAVE_CRYPT */
}
void Item_func_encode::fix_length_and_dec()
{
max_length=args[0]->max_length;
maybe_null=args[0]->maybe_null;
}
String *Item_func_encode::val_str(String *str)
{
String *res;
if (!(res=args[0]->val_str(str)))
{
null_value=1; /* purecov: inspected */
return 0; /* purecov: inspected */
}
null_value=0;
res=copy_if_not_alloced(str,res,res->length());
sql_crypt.init();
sql_crypt.encode((char*) res->ptr(),res->length());
return res;
}
String *Item_func_decode::val_str(String *str)
{
String *res;
if (!(res=args[0]->val_str(str)))
{
null_value=1; /* purecov: inspected */
return 0; /* purecov: inspected */
}
null_value=0;
res=copy_if_not_alloced(str,res,res->length());
sql_crypt.init();
sql_crypt.decode((char*) res->ptr(),res->length());
return res;
}
String *Item_func_database::val_str(String *str)
{
if (!current_thd->db)
str->length(0);
else
str->set((const char*) current_thd->db,(uint) strlen(current_thd->db));
return str;
}
String *Item_func_user::val_str(String *str)
{
// TODO: make USER() replicate properly (currently it is replicated to "")
THD *thd=current_thd;
if (!(thd->user) || // for system threads (e.g. replication SQL thread)
str->copy((const char*) thd->user,(uint) strlen(thd->user)) ||
str->append('@') ||
str->append(thd->host ? thd->host : thd->ip ? thd->ip : ""))
return &empty_string;
return str;
}
void Item_func_soundex::fix_length_and_dec()
{
max_length=args[0]->max_length;
set_if_bigger(max_length,4);
}
/*
If alpha, map input letter to soundex code.
If not alpha and remove_garbage is set then skip to next char
else return 0
*/
extern "C" {
extern const char *soundex_map; // In mysys/static.c
}
static char get_scode(char *ptr)
{
uchar ch=toupper(*ptr);
if (ch < 'A' || ch > 'Z')
{
// Thread extended alfa (country spec)
return '0'; // as vokal
}
return(soundex_map[ch-'A']);
}
String *Item_func_soundex::val_str(String *str)
{
String *res =args[0]->val_str(str);
char last_ch,ch;
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
if (tmp_value.alloc(max(res->length(),4)))
return str; /* purecov: inspected */
char *to= (char *) tmp_value.ptr();
char *from= (char *) res->ptr(), *end=from+res->length();
while (from != end && !isalpha(*from)) // Skip pre-space
from++; /* purecov: inspected */
if (from == end)
return &empty_string; // No alpha characters.
*to++ = toupper(*from); // Copy first letter
last_ch = get_scode(from); // code of the first letter
// 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++)
{
if (!isalpha(*from))
continue;
ch=get_scode(from);
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
}
for (end=(char*) tmp_value.ptr()+4 ; to < end ; to++)
*to = '0';
*to=0; // end string
tmp_value.length((uint) (to-tmp_value.ptr()));
return &tmp_value;
}
/*
** Change a number to format '3,333,333,333.000'
** This should be 'internationalized' sometimes.
*/
Item_func_format::Item_func_format(Item *org,int dec) :Item_str_func(org)
{
decimals=(uint) set_zone(dec,0,30);
}
String *Item_func_format::val_str(String *str)
{
double nr =args[0]->val();
uint32 diff,length,str_length;
uint dec;
if ((null_value=args[0]->null_value))
return 0; /* purecov: inspected */
dec= decimals ? decimals+1 : 0;
str->set(nr,decimals);
#ifdef HAVE_ISNAN
if (isnan(nr))
return str;
#endif
str_length=str->length();
if (nr < 0)
str_length--; // Don't count sign
/* We need this test to handle 'nan' values */
if (str_length >= dec+4)
{
char *tmp,*pos;
length= str->length()+(diff=(str_length- dec-1)/3);
str= copy_if_not_alloced(&tmp_str,str,length);
str->length(length);
tmp= (char*) str->ptr()+length - dec-1;
for (pos= (char*) str->ptr()+length-1; pos != tmp; pos--)
pos[0]= pos[-(int) diff];
while (diff)
{
pos[0]=pos[-(int) diff]; pos--;
pos[0]=pos[-(int) diff]; pos--;
pos[0]=pos[-(int) diff]; pos--;
pos[0]=',';
pos--;
diff--;
}
}
return str;
}
void Item_func_elt::fix_length_and_dec()
{
max_length=0;
decimals=0;
#if MYSQL_VERSION_ID < 40100
for (uint i= 0; i < arg_count ; i++)
#else
for (uint i= 1; i < arg_count ; i++)
#endif
{
set_if_bigger(max_length,args[i]->max_length);
set_if_bigger(decimals,args[i]->decimals);
}
maybe_null=1; // NULL if wrong first arg
with_sum_func= with_sum_func || item->with_sum_func;
used_tables_cache|= item->used_tables();
not_null_tables_cache&= item->not_null_tables();
const_item_cache&= item->const_item();
}
void Item_func_elt::split_sum_func(List<Item> &fields)
{
if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
item->split_sum_func(fields);
else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
{
fields.push_front(item);
item= new Item_ref((Item**) fields.head_ref(), 0, item->name);
}
Item_str_func::split_sum_func(fields);
}
void Item_func_elt::update_used_tables()
{
Item_func::update_used_tables();
item->update_used_tables();
used_tables_cache|=item->used_tables();
const_item_cache&=item->const_item();
}
double Item_func_elt::val()
{
uint tmp;
null_value=1;
if ((tmp=(uint) item->val_int()) == 0 || tmp > arg_count)
return 0.0;
double result= args[tmp-1]->val();
null_value= args[tmp-1]->null_value;
return result;
}
longlong Item_func_elt::val_int()
{
uint tmp;
null_value=1;
if ((tmp=(uint) item->val_int()) == 0 || tmp > arg_count)
return 0;
longlong result= args[tmp-1]->val_int();
null_value= args[tmp-1]->null_value;
return result;
}
String *Item_func_elt::val_str(String *str)
{
uint tmp;
null_value=1;
if ((tmp=(uint) item->val_int()) == 0 || tmp > arg_count)
return NULL;
String *result= args[tmp-1]->val_str(str);
null_value= args[tmp-1]->null_value;
return result;
}
void Item_func_make_set::split_sum_func(List<Item> &fields)
{
if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
item->split_sum_func(fields);
else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
{
fields.push_front(item);
item= new Item_ref((Item**) fields.head_ref(), 0, item->name);
}
Item_str_func::split_sum_func(fields);
}
void Item_func_make_set::fix_length_and_dec()
{
max_length=arg_count-1;
for (uint i=1 ; i < arg_count ; i++)
max_length+=args[i]->max_length;
used_tables_cache|= item->used_tables();
not_null_tables_cache&= item->not_null_tables();
const_item_cache&= item->const_item();
with_sum_func= with_sum_func || item->with_sum_func;
}
void Item_func_make_set::update_used_tables()
{
Item_func::update_used_tables();
item->update_used_tables();
used_tables_cache|=item->used_tables();
const_item_cache&=item->const_item();
}
String *Item_func_make_set::val_str(String *str)
{
ulonglong bits;
bool first_found=0;
Item **ptr=args;
String *result=&empty_string;
bits=item->val_int();
if ((null_value=item->null_value))
return NULL;
if (arg_count < 64)
bits &= ((ulonglong) 1 << arg_count)-1;
for (; bits; bits >>= 1, ptr++)
{
if (bits & 1)
{
String *res= (*ptr)->val_str(str);
if (res) // Skip nulls
{
if (!first_found)
{ // First argument
first_found=1;
if (res != str)
result=res; // Use original string
else
{
if (tmp_str.copy(*res)) // Don't use 'str'
return &empty_string;
result= &tmp_str;
}
}
else
{
if (result != &tmp_str)
{ // Copy data to tmp_str
if (tmp_str.alloc(result->length()+res->length()+1) ||
tmp_str.copy(*result))
return &empty_string;
result= &tmp_str;
}
if (tmp_str.append(',') || tmp_str.append(*res))
return &empty_string;
}
}
}
}
return result;
}
String *Item_func_char::val_str(String *str)
{
str->length(0);
for (uint i=0 ; i < arg_count ; i++)
{
int32 num=(int32) args[i]->val_int();
if (!args[i]->null_value)
#ifdef USE_MB
if (use_mb(default_charset_info))
{
if (num&0xFF000000L) {
str->append((char)(num>>24));
goto b2;
} else if (num&0xFF0000L) {
b2: str->append((char)(num>>16));
goto b1;
} else if (num&0xFF00L) {
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;
}
if (tmp_value->alloc(length))
return 0;
(void) tmp_value->copy(*res);
tmp_value->length(length);
return tmp_value;
}
res->length(length);
return res;
}
void Item_func_repeat::fix_length_and_dec()
{
if (args[1]->const_item())
{
max_length=(long) (args[0]->max_length * args[1]->val_int());
if (max_length >= MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
else
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
/*
** Item_func_repeat::str is carefully written to avoid reallocs
** as much as possible at the cost of a local buffer
*/
String *Item_func_repeat::val_str(String *str)
{
uint length,tot_length;
char *to;
long count= (long) args[1]->val_int();
String *res =args[0]->val_str(str);
if (args[0]->null_value || args[1]->null_value)
goto err; // string and/or delim are null
null_value=0;
if (count <= 0) // For nicer SQL code
return &empty_string;
if (count == 1) // To avoid reallocs
return res;
length=res->length();
// Safe length check
if (length > current_thd->variables.max_allowed_packet/count)
goto err; // Probably an error
tot_length= length*(uint) count;
if (!(res= alloc_buffer(res,str,&tmp_value,tot_length)))
goto err;
to=(char*) res->ptr()+length;
while (--count)
{
memcpy(to,res->ptr(),length);
to+=length;
}
return (res);
err:
null_value=1;
return 0;
}
void Item_func_rpad::fix_length_and_dec()
{
if (args[1]->const_item())
{
uint32 length= (uint32) args[1]->val_int();
max_length=max(args[0]->max_length,length);
if (max_length >= MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
else
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
String *Item_func_rpad::val_str(String *str)
{
uint32 res_length,length_pad;
char *to;
const char *ptr_pad;
int32 count= (int32) args[1]->val_int();
String *res =args[0]->val_str(str);
String *rpad = args[2]->val_str(&rpad_str);
if (!res || args[1]->null_value || !rpad || count < 0)
goto err;
null_value=0;
if (count <= (int32) (res_length=res->length()))
{ // String to pad is big enough
res->length(count); // Shorten result if longer
return (res);
}
length_pad= rpad->length();
if ((ulong) count > current_thd->variables.max_allowed_packet ||
args[2]->null_value || !length_pad)
goto err;
if (!(res= alloc_buffer(res,str,&tmp_value,count)))
goto err;
to= (char*) res->ptr()+res_length;
ptr_pad=rpad->ptr();
for (count-= res_length; (uint32) count > length_pad; count-= length_pad)
{
memcpy(to,ptr_pad,length_pad);
to+= length_pad;
}
memcpy(to,ptr_pad,(size_t) count);
return (res);
err:
null_value=1;
return 0;
}
void Item_func_lpad::fix_length_and_dec()
{
if (args[1]->const_item())
{
uint32 length= (uint32) args[1]->val_int();
max_length=max(args[0]->max_length,length);
if (max_length >= MAX_BLOB_WIDTH)
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
else
{
max_length=MAX_BLOB_WIDTH;
maybe_null=1;
}
}
String *Item_func_lpad::val_str(String *str)
{
uint32 res_length,length_pad;
char *to;
const char *ptr_pad;
ulong count= (long) args[1]->val_int();
String *res= args[0]->val_str(str);
String *lpad= args[2]->val_str(&lpad_str);
if (!res || args[1]->null_value || !lpad)
goto err;
null_value=0;
if (count <= (res_length=res->length()))
{ // String to pad is big enough
res->length(count); // Shorten result if longer
return (res);
}
length_pad= lpad->length();
if (count > current_thd->variables.max_allowed_packet ||
args[2]->null_value || !length_pad)
goto err;
if (res->alloced_length() < count)
{
if (str->alloced_length() >= count)
{
memcpy((char*) str->ptr()+(count-res_length),res->ptr(),res_length);
res=str;
}
else
{
if (tmp_value.alloc(count))
goto err;
memcpy((char*) tmp_value.ptr()+(count-res_length),res->ptr(),res_length);
res=&tmp_value;
}
}
else
bmove_upp((char*) res->ptr()+count,res->ptr()+res_length,res_length);
res->length(count);
to= (char*) res->ptr();
ptr_pad= lpad->ptr();
for (count-= res_length; count > length_pad; count-= length_pad)
{
memcpy(to,ptr_pad,length_pad);
to+= length_pad;
}
memcpy(to,ptr_pad,(size_t) count);
return (res);
err:
null_value=1;
return 0;
}
String *Item_func_conv::val_str(String *str)
{
String *res= args[0]->val_str(str);
char *endptr,ans[65],*ptr;
longlong dec;
int from_base= (int) args[1]->val_int();
int to_base= (int) args[2]->val_int();
if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
abs(to_base) > 36 || abs(to_base) < 2 ||
abs(from_base) > 36 || abs(from_base) < 2 || !(res->length()))
{
null_value=1;
return 0;
}
null_value=0;
if (from_base < 0)
dec= strtoll(res->c_ptr(),&endptr,-from_base);
else
dec= (longlong) strtoull(res->c_ptr(),&endptr,from_base);
ptr= longlong2str(dec,ans,to_base);
if (str->copy(ans,(uint32) (ptr-ans)))
return &empty_string;
return str;
}
String *Item_func_hex::val_str(String *str)
{
if (args[0]->result_type() != STRING_RESULT)
{
/* Return hex of unsigned longlong value */
longlong dec= args[0]->val_int();
char ans[65],*ptr;
if ((null_value= args[0]->null_value))
return 0;
ptr= longlong2str(dec,ans,16);
if (str->copy(ans,(uint32) (ptr-ans)))
return &empty_string; // End of memory
return str;
}
/* Convert given string to a hex string, character by character */
String *res= args[0]->val_str(str);
const char *from, *end;
char *to;
if (!res || tmp_value.alloc(res->length()*2))
{
null_value=1;
return 0;
}
null_value=0;
tmp_value.length(res->length()*2);
for (from=res->ptr(), end=from+res->length(), to= (char*) tmp_value.ptr();
from != end ;
from++, to+=2)
{
uint tmp=(uint) (uchar) *from;
to[0]=_dig_vec[tmp >> 4];
to[1]=_dig_vec[tmp & 15];
}
return &tmp_value;
}
#include <my_dir.h> // For my_stat
String *Item_load_file::val_str(String *str)
{
String *file_name;
File file;
MY_STAT stat_info;
DBUG_ENTER("load_file");
if (!(file_name= args[0]->val_str(str)) ||
!(current_thd->master_access & FILE_ACL) ||
!my_stat(file_name->c_ptr(), &stat_info, MYF(MY_WME)))
goto err;
if (!(stat_info.st_mode & S_IROTH))
{
/* my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), file_name->c_ptr()); */
goto err;
}
if (stat_info.st_size > (long) current_thd->variables.max_allowed_packet)
{
/* my_error(ER_TOO_LONG_STRING, MYF(0), file_name->c_ptr()); */
goto err;
}
if (tmp_value.alloc(stat_info.st_size))
goto err;
if ((file = my_open(file_name->c_ptr(), O_RDONLY, MYF(0))) < 0)
goto err;
if (my_read(file, (byte*) tmp_value.ptr(), stat_info.st_size, MYF(MY_NABP)))
{
my_close(file, MYF(0));
goto err;
}
tmp_value.length(stat_info.st_size);
my_close(file, MYF(0));
null_value = 0;
return &tmp_value;
err:
null_value = 1;
DBUG_RETURN(0);
}
String* Item_func_export_set::val_str(String* str)
{
ulonglong the_set = (ulonglong) args[0]->val_int();
String yes_buf, *yes;
yes = args[1]->val_str(&yes_buf);
String no_buf, *no;
no = args[2]->val_str(&no_buf);
String *sep = NULL, sep_buf ;
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;
}
/*
Arg count can only be 3, 4 or 5 here. This is guaranteed from the
grammar for EXPORT_SET()
*/
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:
sep_buf.set(",", 1);
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);
if (i != num_set_values - 1)
str->append(*sep);
}
return str;
}
void Item_func_export_set::fix_length_and_dec()
{
uint length=max(args[1]->max_length,args[2]->max_length);
uint sep_length=(arg_count > 3 ? args[3]->max_length : 1);
max_length=length*64+sep_length*63;
}
String* Item_func_inet_ntoa::val_str(String* str)
{
uchar buf[8], *p;
ulonglong n = (ulonglong) args[0]->val_int();
char num[4];
/*
We do not know if args[0] is NULL until we have called
some val function on it if args[0] is not a constant!
Also return null if n > 255.255.255.255
*/
if ((null_value= (args[0]->null_value || n > (ulonglong) LL(4294967295))))
return 0; // Null value
str->length(0);
int4store(buf,n);
/* Now we can assume little endian. */
num[3]='.';
for (p=buf+4 ; p-- > buf ; )
{
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;
}
/*
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
running commands from a file in windows.
This function is very useful when you want to generate SQL statements
NOTE
QUOTE(NULL) returns the string 'NULL' (4 letters, without quotes).
RETURN VALUES
str Quoted string
NULL Out of memory.
*/
#define get_esc_bit(mask, num) (1 & (*((mask) + ((num) >> 3))) >> ((num) & 7))
String *Item_func_quote::val_str(String *str)
{
/*
Bit mask that has 1 for set for the position of the following characters:
0, \, ' and ^Z
*/
static uchar escmask[32]=
{
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
};
char *from, *to, *end, *start;
String *arg= args[0]->val_str(str);
uint arg_length, new_length;
if (!arg) // Null argument
{
str->copy("NULL", 4); // Return the string 'NULL'
null_value= 0;
return str;
}
arg_length= arg->length();
new_length= arg_length+2; /* for beginning and ending ' signs */
for (from= (char*) arg->ptr(), end= from + arg_length; from < end; from++)
new_length+= get_esc_bit(escmask, (uchar) *from);
/*
We have to use realloc() instead of alloc() as we want to keep the
old result in arg
*/
if (arg->realloc(new_length))
goto null;
/*
As 'arg' and 'str' may be the same string, we must replace characters
from the end to the beginning
*/
to= (char*) arg->ptr() + new_length - 1;
*to--= '\'';
for (start= (char*) arg->ptr(),end= start + arg_length; end-- != start; to--)
{
/*
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;
}
}
*to= '\'';
arg->length(new_length);
null_value= 0;
return arg;
null:
null_value= 1;
return 0;
}
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