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mariadb/sql/sql_string.cc
unknown 79f6e16d5e a proper fix for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause. 
<monty> ramil, in MySQL/MyISAM we should only strip end space, not 'space-like' characters.
<monty> This is according to SQL;  When doing a comparision end space and only end space are ignored.



myisam/mi_key.c:
  a proper fix for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause.
myisam/mi_search.c:
  a proper fix for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause.
mysql-test/r/select.result:
  test case for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause.
mysql-test/t/select.test:
  test case for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause.
sql/sql_string.cc:
  a proper fix for the bug #2298 Trailing whitespace inconsistently handled in WHERE clause.
2004-01-22 18:05:47 +04:00

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/* Copyright (C) 2000 MySQL 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 is originally from the mysql distribution. Coded by monty */
#ifdef __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include <my_global.h>
#include <my_sys.h>
#include <m_string.h>
#include <m_ctype.h>
#ifdef HAVE_FCONVERT
#include <floatingpoint.h>
#endif
extern gptr sql_alloc(unsigned size);
extern void sql_element_free(void *ptr);
#include "sql_string.h"
/*****************************************************************************
** String functions
*****************************************************************************/
bool String::real_alloc(uint32 arg_length)
{
arg_length=ALIGN_SIZE(arg_length+1);
str_length=0;
if (Alloced_length < arg_length)
{
free();
if (!(Ptr=(char*) my_malloc(arg_length,MYF(MY_WME))))
return TRUE;
Alloced_length=arg_length;
alloced=1;
}
Ptr[0]=0;
return FALSE;
}
/*
** Check that string is big enough. Set string[alloc_length] to 0
** (for C functions)
*/
bool String::realloc(uint32 alloc_length)
{
uint32 len=ALIGN_SIZE(alloc_length+1);
if (Alloced_length < len)
{
char *new_ptr;
if (alloced)
{
if ((new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
{
Ptr=new_ptr;
Alloced_length=len;
}
else
return TRUE; // Signal error
}
else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
{
if (str_length) // Avoid bugs in memcpy on AIX
memcpy(new_ptr,Ptr,str_length);
new_ptr[str_length]=0;
Ptr=new_ptr;
Alloced_length=len;
alloced=1;
}
else
return TRUE; // Signal error
}
Ptr[alloc_length]=0; // This make other funcs shorter
return FALSE;
}
bool String::set(longlong num)
{
if (alloc(21))
return TRUE;
str_length=(uint32) (longlong10_to_str(num,Ptr,-10)-Ptr);
return FALSE;
}
bool String::set(ulonglong num)
{
if (alloc(21))
return TRUE;
str_length=(uint32) (longlong10_to_str(num,Ptr,10)-Ptr);
return FALSE;
}
bool String::set(double num,uint decimals)
{
char buff[331];
if (decimals >= NOT_FIXED_DEC)
{
sprintf(buff,"%.14g",num); // Enough for a DATETIME
return copy(buff, (uint32) strlen(buff));
}
#ifdef HAVE_FCONVERT
int decpt,sign;
char *pos,*to;
VOID(fconvert(num,(int) decimals,&decpt,&sign,buff+1));
if (!isdigit(buff[1]))
{ // Nan or Inf
pos=buff+1;
if (sign)
{
buff[0]='-';
pos=buff;
}
return copy(pos,(uint32) strlen(pos));
}
if (alloc((uint32) ((uint32) decpt+3+decimals)))
return TRUE;
to=Ptr;
if (sign)
*to++='-';
pos=buff+1;
if (decpt < 0)
{ /* value is < 0 */
*to++='0';
if (!decimals)
goto end;
*to++='.';
if ((uint32) -decpt > decimals)
decpt= - (int) decimals;
decimals=(uint32) ((int) decimals+decpt);
while (decpt++ < 0)
*to++='0';
}
else if (decpt == 0)
{
*to++= '0';
if (!decimals)
goto end;
*to++='.';
}
else
{
while (decpt-- > 0)
*to++= *pos++;
if (!decimals)
goto end;
*to++='.';
}
while (decimals--)
*to++= *pos++;
end:
*to=0;
str_length=(uint32) (to-Ptr);
return FALSE;
#else
#ifdef HAVE_SNPRINTF
buff[sizeof(buff)-1]=0; // Safety
snprintf(buff,sizeof(buff)-1, "%.*f",(int) decimals,num);
#else
sprintf(buff,"%.*f",(int) decimals,num);
#endif
return copy(buff,(uint32) strlen(buff));
#endif
}
bool String::copy()
{
if (!alloced)
{
Alloced_length=0; // Force realloc
return realloc(str_length);
}
return FALSE;
}
bool String::copy(const String &str)
{
if (alloc(str.str_length))
return TRUE;
str_length=str.str_length;
bmove(Ptr,str.Ptr,str_length); // May be overlapping
Ptr[str_length]=0;
return FALSE;
}
bool String::copy(const char *str,uint32 arg_length)
{
if (alloc(arg_length))
return TRUE;
if ((str_length=arg_length))
memcpy(Ptr,str,arg_length);
Ptr[arg_length]=0;
return FALSE;
}
/* This is used by mysql.cc */
bool String::fill(uint32 max_length,char fill_char)
{
if (str_length > max_length)
Ptr[str_length=max_length]=0;
else
{
if (realloc(max_length))
return TRUE;
bfill(Ptr+str_length,max_length-str_length,fill_char);
str_length=max_length;
}
return FALSE;
}
void String::strip_sp()
{
while (str_length && isspace(Ptr[str_length-1]))
str_length--;
}
bool String::append(const String &s)
{
if (s.length())
{
if (realloc(str_length+s.length()))
return TRUE;
memcpy(Ptr+str_length,s.ptr(),s.length());
str_length+=s.length();
}
return FALSE;
}
bool String::append(const char *s,uint32 arg_length)
{
if (!arg_length) // Default argument
if (!(arg_length= (uint32) strlen(s)))
return FALSE;
if (realloc(str_length+arg_length))
return TRUE;
memcpy(Ptr+str_length,s,arg_length);
str_length+=arg_length;
return FALSE;
}
#ifdef TO_BE_REMOVED
bool String::append(FILE* file, uint32 arg_length, myf my_flags)
{
if (realloc(str_length+arg_length))
return TRUE;
if (my_fread(file, (byte*) Ptr + str_length, arg_length, my_flags))
{
shrink(str_length);
return TRUE;
}
str_length+=arg_length;
return FALSE;
}
#endif
bool String::append(IO_CACHE* file, uint32 arg_length)
{
if (realloc(str_length+arg_length))
return TRUE;
if (my_b_read(file, (byte*) Ptr + str_length, arg_length))
{
shrink(str_length);
return TRUE;
}
str_length+=arg_length;
return FALSE;
}
uint32 String::numchars()
{
#ifdef USE_MB
register uint32 n=0,mblen;
register const char *mbstr=Ptr;
register const char *end=mbstr+str_length;
if (use_mb(default_charset_info))
{
while (mbstr < end) {
if ((mblen=my_ismbchar(default_charset_info, mbstr,end))) mbstr+=mblen;
else ++mbstr;
++n;
}
return n;
}
else
#endif
return str_length;
}
int String::charpos(int i,uint32 offset)
{
#ifdef USE_MB
register uint32 mblen;
register const char *mbstr=Ptr+offset;
register const char *end=Ptr+str_length;
if (use_mb(default_charset_info))
{
if (i<=0) return i;
while (i && mbstr < end) {
if ((mblen=my_ismbchar(default_charset_info, mbstr,end))) mbstr+=mblen;
else ++mbstr;
--i;
}
if ( INT_MAX32-i <= (int) (mbstr-Ptr-offset))
return INT_MAX32;
else
return (int) ((mbstr-Ptr-offset)+i);
}
else
#endif
return i;
}
int String::strstr(const String &s,uint32 offset)
{
if (s.length()+offset <= str_length)
{
if (!s.length())
return ((int) offset); // Empty string is always found
register const char *str = Ptr+offset;
register const char *search=s.ptr();
const char *end=Ptr+str_length-s.length()+1;
const char *search_end=s.ptr()+s.length();
skipp:
while (str != end)
{
if (*str++ == *search)
{
register char *i,*j;
i=(char*) str; j=(char*) search+1;
while (j != search_end)
if (*i++ != *j++) goto skipp;
return (int) (str-Ptr) -1;
}
}
}
return -1;
}
/*
Search after a string without regarding to case
This needs to be replaced when we have character sets per string
*/
int String::strstr_case(const String &s,uint32 offset)
{
if (s.length()+offset <= str_length)
{
if (!s.length())
return ((int) offset); // Empty string is always found
register const char *str = Ptr+offset;
register const char *search=s.ptr();
const char *end=Ptr+str_length-s.length()+1;
const char *search_end=s.ptr()+s.length();
skipp:
while (str != end)
{
if (my_sort_order[*str++] == my_sort_order[*search])
{
register char *i,*j;
i=(char*) str; j=(char*) search+1;
while (j != search_end)
if (my_sort_order[*i++] != my_sort_order[*j++]) goto skipp;
return (int) (str-Ptr) -1;
}
}
}
return -1;
}
/*
** Search string from end. Offset is offset to the end of string
*/
int String::strrstr(const String &s,uint32 offset)
{
if (s.length() <= offset && offset <= str_length)
{
if (!s.length())
return offset; // Empty string is always found
register const char *str = Ptr+offset-1;
register const char *search=s.ptr()+s.length()-1;
const char *end=Ptr+s.length()-2;
const char *search_end=s.ptr()-1;
skipp:
while (str != end)
{
if (*str-- == *search)
{
register char *i,*j;
i=(char*) str; j=(char*) search-1;
while (j != search_end)
if (*i-- != *j--) goto skipp;
return (int) (i-Ptr) +1;
}
}
}
return -1;
}
/*
** replace substring with string
** If wrong parameter or not enough memory, do nothing
*/
bool String::replace(uint32 offset,uint32 arg_length,const String &to)
{
long diff = (long) to.length()-(long) arg_length;
if (offset+arg_length <= str_length)
{
if (diff < 0)
{
if (to.length())
memcpy(Ptr+offset,to.ptr(),to.length());
bmove(Ptr+offset+to.length(),Ptr+offset+arg_length,
str_length-offset-arg_length);
}
else
{
if (diff)
{
if (realloc(str_length+(uint32) diff))
return TRUE;
bmove_upp(Ptr+str_length+diff,Ptr+str_length,
str_length-offset-arg_length);
}
if (to.length())
memcpy(Ptr+offset,to.ptr(),to.length());
}
str_length+=(uint32) diff;
}
return FALSE;
}
int sortcmp(const String *x,const String *y)
{
const char *s= x->ptr();
const char *t= y->ptr();
uint32 x_len=x->length(),y_len=y->length(),len=min(x_len,y_len);
#ifdef USE_STRCOLL
if (use_strcoll(default_charset_info))
{
#ifndef CMP_ENDSPACE
while (x_len && s[x_len-1] == ' ')
x_len--;
while (y_len && t[y_len-1] == ' ')
y_len--;
#endif
return my_strnncoll(default_charset_info,
(unsigned char *)s,x_len,(unsigned char *)t,y_len);
}
else
{
#endif /* USE_STRCOLL */
x_len-=len; // For easy end space test
y_len-=len;
while (len--)
{
if (my_sort_order[(uchar) *s++] != my_sort_order[(uchar) *t++])
return ((int) my_sort_order[(uchar) s[-1]] -
(int) my_sort_order[(uchar) t[-1]]);
}
#ifndef CMP_ENDSPACE
/* Don't compare end space in strings */
{
if (y_len)
{
const char *end=t+y_len;
for (; t != end ; t++)
if (*t != ' ')
return -1;
}
else
{
const char *end=s+x_len;
for (; s != end ; s++)
if (*s != ' ')
return 1;
}
return 0;
}
#else
return (int) (x_len-y_len);
#endif /* CMP_ENDSPACE */
#ifdef USE_STRCOLL
}
#endif
}
int stringcmp(const String *x,const String *y)
{
const char *s= x->ptr();
const char *t= y->ptr();
uint32 x_len=x->length(),y_len=y->length(),len=min(x_len,y_len);
while (len--)
{
if (*s++ != *t++)
return ((int) (uchar) s[-1] - (int) (uchar) t[-1]);
}
return (int) (x_len-y_len);
}
String *copy_if_not_alloced(String *to,String *from,uint32 from_length)
{
if (from->Alloced_length >= from_length)
return from;
if (from->alloced || !to || from == to)
{
(void) from->realloc(from_length);
return from;
}
if (to->realloc(from_length))
return from; // Actually an error
if ((to->str_length=min(from->str_length,from_length)))
memcpy(to->Ptr,from->Ptr,to->str_length);
return to;
}
/* Make it easier to handle different charactersets */
#ifdef USE_MB
#define INC_PTR(A,B) A+=((use_mb_flag && \
my_ismbchar(default_charset_info,A,B)) ? \
my_ismbchar(default_charset_info,A,B) : 1)
#else
#define INC_PTR(A,B) A++
#endif
/*
** Compare string against string with wildcard
** 0 if matched
** -1 if not matched with wildcard
** 1 if matched with wildcard
*/
#ifdef LIKE_CMP_TOUPPER
#define likeconv(A) (uchar) toupper(A)
#else
#define likeconv(A) (uchar) my_sort_order[(uchar) (A)]
#endif
int wild_case_compare(const char *str,const char *str_end,
const char *wildstr,const char *wildend,
char escape)
{
int result= -1; // Not found, using wildcards
#ifdef USE_MB
bool use_mb_flag=use_mb(default_charset_info);
#endif
while (wildstr != wildend)
{
while (*wildstr != wild_many && *wildstr != wild_one)
{
if (*wildstr == escape && wildstr+1 != wildend)
wildstr++;
#ifdef USE_MB
int l;
if (use_mb_flag &&
(l = my_ismbchar(default_charset_info, wildstr, wildend)))
{
if (str+l > str_end || memcmp(str, wildstr, l) != 0)
return 1;
str += l;
wildstr += l;
}
else
#endif
if (str == str_end || likeconv(*wildstr++) != likeconv(*str++))
return(1); // No match
if (wildstr == wildend)
return (str != str_end); // Match if both are at end
result=1; // Found an anchor char
}
if (*wildstr == wild_one)
{
do
{
if (str == str_end) // Skip one char if possible
return (result);
INC_PTR(str,str_end);
} while (++wildstr < wildend && *wildstr == wild_one);
if (wildstr == wildend)
break;
}
if (*wildstr == wild_many)
{ // Found wild_many
wildstr++;
/* Remove any '%' and '_' from the wild search string */
for (; wildstr != wildend ; wildstr++)
{
if (*wildstr == wild_many)
continue;
if (*wildstr == wild_one)
{
if (str == str_end)
return (-1);
INC_PTR(str,str_end);
continue;
}
break; // Not a wild character
}
if (wildstr == wildend)
return(0); // Ok if wild_many is last
if (str == str_end)
return -1;
uchar cmp;
if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
cmp= *++wildstr;
#ifdef USE_MB
const char* mb = wildstr;
int mblen;
LINT_INIT(mblen);
if (use_mb_flag)
mblen = my_ismbchar(default_charset_info, wildstr, wildend);
#endif
INC_PTR(wildstr,wildend); // This is compared trough cmp
cmp=likeconv(cmp);
do
{
#ifdef USE_MB
if (use_mb_flag)
{
for (;;)
{
if (str >= str_end)
return -1;
if (mblen)
{
if (str+mblen <= str_end && memcmp(str, mb, mblen) == 0)
{
str += mblen;
break;
}
}
else if (!my_ismbchar(default_charset_info, str, str_end) &&
likeconv(*str) == cmp)
{
str++;
break;
}
INC_PTR(str, str_end);
}
}
else
{
#endif /* USE_MB */
while (str != str_end && likeconv(*str) != cmp)
str++;
if (str++ == str_end) return (-1);
#ifdef USE_MB
}
#endif
{
int tmp=wild_case_compare(str,str_end,wildstr,wildend,escape);
if (tmp <= 0)
return (tmp);
}
} while (str != str_end && wildstr[0] != wild_many);
return(-1);
}
}
return (str != str_end ? 1 : 0);
}
int wild_case_compare(String &match,String &wild, char escape)
{
DBUG_ENTER("wild_case_compare");
DBUG_PRINT("enter",("match='%s', wild='%s', escape='%c'"
,match.ptr(),wild.ptr(),escape));
DBUG_RETURN(wild_case_compare(match.ptr(),match.ptr()+match.length(),
wild.ptr(), wild.ptr()+wild.length(),escape));
}
/*
** The following is used when using LIKE on binary strings
*/
int wild_compare(const char *str,const char *str_end,
const char *wildstr,const char *wildend,char escape)
{
DBUG_ENTER("wild_compare");
DBUG_PRINT("enter",("str='%s', str_end='%s', wildstr='%s', wildend='%s', escape='%c'"
,str,str_end,wildstr,wildend,escape));
int result= -1; // Not found, using wildcards
while (wildstr != wildend)
{
while (*wildstr != wild_many && *wildstr != wild_one)
{
if (*wildstr == escape && wildstr+1 != wildend)
wildstr++;
if (str == str_end || *wildstr++ != *str++)
{
DBUG_RETURN(1);
}
if (wildstr == wildend)
{
DBUG_RETURN(str != str_end); // Match if both are at end
}
result=1; // Found an anchor char
}
if (*wildstr == wild_one)
{
do
{
if (str == str_end) // Skip one char if possible
DBUG_RETURN(result);
str++;
} while (*++wildstr == wild_one && wildstr != wildend);
if (wildstr == wildend)
break;
}
if (*wildstr == wild_many)
{ // Found wild_many
wildstr++;
/* Remove any '%' and '_' from the wild search string */
for (; wildstr != wildend ; wildstr++)
{
if (*wildstr == wild_many)
continue;
if (*wildstr == wild_one)
{
if (str == str_end)
{
DBUG_RETURN(-1);
}
str++;
continue;
}
break; // Not a wild character
}
if (wildstr == wildend)
{
DBUG_RETURN(0); // Ok if wild_many is last
}
if (str == str_end)
{
DBUG_RETURN(-1);
}
char cmp;
if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
cmp= *++wildstr;
wildstr++; // This is compared trough cmp
do
{
while (str != str_end && *str != cmp)
str++;
if (str++ == str_end)
{
DBUG_RETURN(-1);
}
{
int tmp=wild_compare(str,str_end,wildstr,wildend,escape);
if (tmp <= 0)
{
DBUG_RETURN(tmp);
}
}
} while (str != str_end && wildstr[0] != wild_many);
DBUG_RETURN(-1);
}
}
DBUG_RETURN(str != str_end ? 1 : 0);
}
int wild_compare(String &match,String &wild, char escape)
{
DBUG_ENTER("wild_compare");
DBUG_PRINT("enter",("match='%s', wild='%s', escape='%c'"
,match.ptr(),wild.ptr(),escape));
DBUG_RETURN(wild_compare(match.ptr(),match.ptr()+match.length(),
wild.ptr(), wild.ptr()+wild.length(),escape));
}
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