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mariadb/client/sql_string.cc
Davi Arnaut 11fae04527 Bug#45288: pb2 returns a lot of compilation warnings on linux 
Although the C standard mandates that sprintf return the number
of bytes written, some very ancient systems (i.e. SunOS 4)
returned a pointer to the buffer instead. Since these systems
are not supported anymore and are hopefully long dead by now,
simply remove the portability wrapper that dealt with this
discrepancy. The autoconf check was causing trouble with GCC.
2010-07-09 09:00:17 -03:00

900 lines
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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; version 2 of the License.
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 USE_PRAGMA_IMPLEMENTATION
#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
/*
The following extern declarations are ok as these are interface functions
required by the string function
*/
extern void sql_alloc(size_t 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))))
return TRUE; // Signal error
}
else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
{
if (str_length > len - 1)
str_length= 0;
if (str_length) // Avoid bugs in memcpy on AIX
memcpy(new_ptr,Ptr,str_length);
new_ptr[str_length]=0;
alloced=1;
}
else
return TRUE; // Signal error
Ptr= new_ptr;
Alloced_length= len;
}
Ptr[alloc_length]=0; // This make other funcs shorter
return FALSE;
}
bool String::set(longlong num, CHARSET_INFO *cs)
{
uint l=20*cs->mbmaxlen+1;
if (alloc(l))
return TRUE;
str_length=(uint32) (cs->cset->longlong10_to_str)(cs,Ptr,l,-10,num);
str_charset=cs;
return FALSE;
}
bool String::set(ulonglong num, CHARSET_INFO *cs)
{
uint l=20*cs->mbmaxlen+1;
if (alloc(l))
return TRUE;
str_length=(uint32) (cs->cset->longlong10_to_str)(cs,Ptr,l,10,num);
str_charset=cs;
return FALSE;
}
bool String::set(double num,uint decimals, CHARSET_INFO *cs)
{
char buff[331];
uint dummy_errors;
str_charset=cs;
if (decimals >= NOT_FIXED_DEC)
{
uint32 len= my_sprintf(buff,(buff, "%.15g",num));// Enough for a DATETIME
return copy(buff, len, &my_charset_latin1, cs, &dummy_errors);
}
#ifdef HAVE_FCONVERT
int decpt,sign;
char *pos,*to;
VOID(fconvert(num,(int) decimals,&decpt,&sign,buff+1));
if (!my_isdigit(&my_charset_latin1, buff[1]))
{ // Nan or Inf
pos=buff+1;
if (sign)
{
buff[0]='-';
pos=buff;
}
uint dummy_errors;
return copy(pos,(uint32) strlen(pos), &my_charset_latin1, cs, &dummy_errors);
}
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), &my_charset_latin1, cs,
&dummy_errors);
#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;
str_charset=str.str_charset;
return FALSE;
}
bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *cs)
{
if (alloc(arg_length))
return TRUE;
if ((str_length=arg_length))
memcpy(Ptr,str,arg_length);
Ptr[arg_length]=0;
str_charset=cs;
return FALSE;
}
/*
Checks that the source string can be just copied to the destination string
without conversion.
SYNPOSIS
needs_conversion()
arg_length Length of string to copy.
from_cs Character set to copy from
to_cs Character set to copy to
uint32 *offset Returns number of unaligned characters.
RETURN
0 No conversion needed
1 Either character set conversion or adding leading zeros
(e.g. for UCS-2) must be done
NOTE
to_cs may be NULL for "no conversion" if the system variable
character_set_results is NULL.
*/
bool String::needs_conversion(uint32 arg_length,
CHARSET_INFO *from_cs,
CHARSET_INFO *to_cs,
uint32 *offset)
{
*offset= 0;
if (!to_cs ||
(to_cs == &my_charset_bin) ||
(to_cs == from_cs) ||
my_charset_same(from_cs, to_cs) ||
((from_cs == &my_charset_bin) &&
(!(*offset=(arg_length % to_cs->mbminlen)))))
return FALSE;
return TRUE;
}
/*
Copy a multi-byte character sets with adding leading zeros.
SYNOPSIS
copy_aligned()
str String to copy
arg_length Length of string. This should NOT be dividable with
cs->mbminlen.
offset arg_length % cs->mb_minlength
cs Character set for 'str'
NOTES
For real multi-byte, ascii incompatible charactser sets,
like UCS-2, add leading zeros if we have an incomplete character.
Thus,
SELECT _ucs2 0xAA
will automatically be converted into
SELECT _ucs2 0x00AA
RETURN
0 ok
1 error
*/
bool String::copy_aligned(const char *str,uint32 arg_length, uint32 offset,
CHARSET_INFO *cs)
{
/* How many bytes are in incomplete character */
offset= cs->mbmaxlen - offset; /* How many zeros we should prepend */
DBUG_ASSERT(offset && offset != cs->mbmaxlen);
uint32 aligned_length= arg_length + offset;
if (alloc(aligned_length))
return TRUE;
/*
Note, this is only safe for little-endian UCS-2.
If we add big-endian UCS-2 sometimes, this code
will be more complicated. But it's OK for now.
*/
bzero((char*) Ptr, offset);
memcpy(Ptr + offset, str, arg_length);
Ptr[aligned_length]=0;
/* str_length is always >= 0 as arg_length is != 0 */
str_length= aligned_length;
str_charset= cs;
return FALSE;
}
bool String::set_or_copy_aligned(const char *str,uint32 arg_length,
CHARSET_INFO *cs)
{
/* How many bytes are in incomplete character */
uint32 offset= (arg_length % cs->mbminlen);
if (!offset) /* All characters are complete, just copy */
{
set(str, arg_length, cs);
return FALSE;
}
return copy_aligned(str, arg_length, offset, cs);
}
/* Copy with charset convertion */
bool String::copy(const char *str, uint32 arg_length,
CHARSET_INFO *from_cs, CHARSET_INFO *to_cs, uint *errors)
{
uint32 offset;
if (!needs_conversion(arg_length, from_cs, to_cs, &offset))
{
*errors= 0;
return copy(str, arg_length, to_cs);
}
if ((from_cs == &my_charset_bin) && offset)
{
*errors= 0;
return copy_aligned(str, arg_length, offset, to_cs);
}
uint32 new_length= to_cs->mbmaxlen*arg_length;
if (alloc(new_length))
return TRUE;
str_length=copy_and_convert((char*) Ptr, new_length, to_cs,
str, arg_length, from_cs, errors);
str_charset=to_cs;
return FALSE;
}
/*
Set a string to the value of a latin1-string, keeping the original charset
SYNOPSIS
copy_or_set()
str String of a simple charset (latin1)
arg_length Length of string
IMPLEMENTATION
If string object is of a simple character set, set it to point to the
given string.
If not, make a copy and convert it to the new character set.
RETURN
0 ok
1 Could not allocate result buffer
*/
bool String::set_ascii(const char *str, uint32 arg_length)
{
if (str_charset->mbminlen == 1)
{
set(str, arg_length, str_charset);
return 0;
}
uint dummy_errors;
return copy(str, arg_length, &my_charset_latin1, str_charset, &dummy_errors);
}
/* 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 && my_isspace(str_charset,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;
}
/*
Append an ASCII string to the a string of the current character set
*/
bool String::append(const char *s,uint32 arg_length)
{
if (!arg_length)
return FALSE;
/*
For an ASCII incompatible string, e.g. UCS-2, we need to convert
*/
if (str_charset->mbminlen > 1)
{
uint32 add_length=arg_length * str_charset->mbmaxlen;
uint dummy_errors;
if (realloc(str_length+ add_length))
return TRUE;
str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
s, arg_length, &my_charset_latin1,
&dummy_errors);
return FALSE;
}
/*
For an ASCII compatinble string we can just append.
*/
if (realloc(str_length+arg_length))
return TRUE;
memcpy(Ptr+str_length,s,arg_length);
str_length+=arg_length;
return FALSE;
}
/*
Append a 0-terminated ASCII string
*/
bool String::append(const char *s)
{
return append(s, (uint) strlen(s));
}
/*
Append a string in the given charset to the string
with character set recoding
*/
bool String::append(const char *s,uint32 arg_length, CHARSET_INFO *cs)
{
uint32 dummy_offset;
if (needs_conversion(arg_length, cs, str_charset, &dummy_offset))
{
uint32 add_length= arg_length / cs->mbminlen * str_charset->mbmaxlen;
uint dummy_errors;
if (realloc(str_length + add_length))
return TRUE;
str_length+= copy_and_convert(Ptr+str_length, add_length, str_charset,
s, arg_length, cs, &dummy_errors);
}
else
{
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, (uchar*) 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, (uchar*) Ptr + str_length, arg_length))
{
shrink(str_length);
return TRUE;
}
str_length+=arg_length;
return FALSE;
}
bool String::append_with_prefill(const char *s,uint32 arg_length,
uint32 full_length, char fill_char)
{
int t_length= arg_length > full_length ? arg_length : full_length;
if (realloc(str_length + t_length))
return TRUE;
t_length= full_length - arg_length;
if (t_length > 0)
{
bfill(Ptr+str_length, t_length, fill_char);
str_length=str_length + t_length;
}
append(s, arg_length);
return FALSE;
}
uint32 String::numchars()
{
return str_charset->cset->numchars(str_charset, Ptr, Ptr+str_length);
}
int String::charpos(int i,uint32 offset)
{
if (i <= 0)
return i;
return str_charset->cset->charpos(str_charset,Ptr+offset,Ptr+str_length,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();
skip:
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 skip;
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;
skip:
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 skip;
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)
{
return replace(offset,arg_length,to.ptr(),to.length());
}
bool String::replace(uint32 offset,uint32 arg_length,
const char *to, uint32 to_length)
{
long diff = (long) to_length-(long) arg_length;
if (offset+arg_length <= str_length)
{
if (diff < 0)
{
if (to_length)
memcpy(Ptr+offset,to,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((uchar*) Ptr+str_length+diff, (uchar*) Ptr+str_length,
str_length-offset-arg_length);
}
if (to_length)
memcpy(Ptr+offset,to,to_length);
}
str_length+=(uint32) diff;
}
return FALSE;
}
// added by Holyfoot for "geometry" needs
int String::reserve(uint32 space_needed, uint32 grow_by)
{
if (Alloced_length < str_length + space_needed)
{
if (realloc(Alloced_length + max(space_needed, grow_by) - 1))
return TRUE;
}
return FALSE;
}
void String::qs_append(const char *str, uint32 len)
{
memcpy(Ptr + str_length, str, len + 1);
str_length += len;
}
void String::qs_append(double d)
{
char *buff = Ptr + str_length;
str_length+= my_sprintf(buff, (buff, "%.15g", d));
}
void String::qs_append(double *d)
{
double ld;
float8get(ld, (char*) d);
qs_append(ld);
}
void String::qs_append(int i)
{
char *buff= Ptr + str_length;
char *end= int10_to_str(i, buff, -10);
str_length+= (int) (end-buff);
}
void String::qs_append(uint i)
{
char *buff= Ptr + str_length;
char *end= int10_to_str(i, buff, 10);
str_length+= (int) (end-buff);
}
/*
Compare strings according to collation, without end space.
SYNOPSIS
sortcmp()
s First string
t Second string
cs Collation
NOTE:
Normally this is case sensitive comparison
RETURN
< 0 s < t
0 s == t
> 0 s > t
*/
int sortcmp(const String *s,const String *t, CHARSET_INFO *cs)
{
return cs->coll->strnncollsp(cs,
(unsigned char *) s->ptr(),s->length(),
(unsigned char *) t->ptr(),t->length(), 0);
}
/*
Compare strings byte by byte. End spaces are also compared.
SYNOPSIS
stringcmp()
s First string
t Second string
NOTE:
Strings are compared as a stream of unsigned chars
RETURN
< 0 s < t
0 s == t
> 0 s > t
*/
int stringcmp(const String *s,const String *t)
{
uint32 s_len=s->length(),t_len=t->length(),len=min(s_len,t_len);
int cmp= memcmp(s->ptr(), t->ptr(), len);
return (cmp) ? cmp : (int) (s_len - t_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);
to->str_charset=from->str_charset;
return to;
}
/****************************************************************************
Help functions
****************************************************************************/
/*
copy a string from one character set to another
SYNOPSIS
copy_and_convert()
to Store result here
to_cs Character set of result string
from Copy from here
from_length Length of from string
from_cs From character set
NOTES
'to' must be big enough as form_length * to_cs->mbmaxlen
RETURN
length of bytes copied to 'to'
*/
uint32
copy_and_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs,
const char *from, uint32 from_length, CHARSET_INFO *from_cs,
uint *errors)
{
int cnvres;
my_wc_t wc;
const uchar *from_end= (const uchar*) from+from_length;
char *to_start= to;
uchar *to_end= (uchar*) to+to_length;
my_charset_conv_mb_wc mb_wc= from_cs->cset->mb_wc;
my_charset_conv_wc_mb wc_mb= to_cs->cset->wc_mb;
uint error_count= 0;
while (1)
{
if ((cnvres= (*mb_wc)(from_cs, &wc, (uchar*) from,
from_end)) > 0)
from+= cnvres;
else if (cnvres == MY_CS_ILSEQ)
{
error_count++;
from++;
wc= '?';
}
else if (cnvres > MY_CS_TOOSMALL)
{
/*
A correct multibyte sequence detected
But it doesn't have Unicode mapping.
*/
error_count++;
from+= (-cnvres);
wc= '?';
}
else
break; // Not enough characters
outp:
if ((cnvres= (*wc_mb)(to_cs, wc, (uchar*) to, to_end)) > 0)
to+= cnvres;
else if (cnvres == MY_CS_ILUNI && wc != '?')
{
error_count++;
wc= '?';
goto outp;
}
else
break;
}
*errors= error_count;
return (uint32) (to - to_start);
}
void String::print(String *str)
{
char *st= (char*)Ptr, *end= st+str_length;
for (; st < end; st++)
{
uchar c= *st;
switch (c)
{
case '\\':
str->append(STRING_WITH_LEN("\\\\"));
break;
case '\0':
str->append(STRING_WITH_LEN("\\0"));
break;
case '\'':
str->append(STRING_WITH_LEN("\\'"));
break;
case '\n':
str->append(STRING_WITH_LEN("\\n"));
break;
case '\r':
str->append(STRING_WITH_LEN("\\r"));
break;
case 26: //Ctrl-Z
str->append(STRING_WITH_LEN("\\z"));
break;
default:
str->append(c);
}
}
}
/*
Exchange state of this object and argument.
SYNOPSIS
String::swap()
RETURN
Target string will contain state of this object and vice versa.
*/
void String::swap(String &s)
{
swap_variables(char *, Ptr, s.Ptr);
swap_variables(uint32, str_length, s.str_length);
swap_variables(uint32, Alloced_length, s.Alloced_length);
swap_variables(bool, alloced, s.alloced);
swap_variables(CHARSET_INFO*, str_charset, s.str_charset);
}
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