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/* Copyright (C) 2003 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 */
/* Some useful string utility functions used by the MySQL server */
#include "mysql_priv.h"
/*
Return bitmap for strings used in a set
SYNOPSIS
find_set()
lib Strings in set
str Strings of set-strings separated by ','
err_pos If error, set to point to start of wrong set string
err_len If error, set to the length of wrong set string
set_warning Set to 1 if some string in set couldn't be used
NOTE
We delete all end space from str before comparison
RETURN
bitmap of all sets found in x.
set_warning is set to 1 if there was any sets that couldn't be set
*/
static const char field_separator=',';
ulonglong find_set(TYPELIB *lib, const char *str, uint length, CHARSET_INFO *cs,
char **err_pos, uint *err_len, bool *set_warning)
{
CHARSET_INFO *strip= cs ? cs : &my_charset_latin1;
const char *end= str + strip->cset->lengthsp(strip, str, length);
ulonglong found= 0;
*err_pos= 0; // No error yet
if (str != end)
{
const char *start= str;
for (;;)
{
const char *pos= start;
uint var_len;
int mblen= 1;
if (cs && cs->mbminlen > 1)
{
for ( ; pos < end; pos+= mblen)
{
my_wc_t wc;
if ((mblen= cs->cset->mb_wc(cs, &wc, (const uchar *) pos,
(const uchar *) end)) < 1)
mblen= 1; // Not to hang on a wrong multibyte sequence
if (wc == (my_wc_t) field_separator)
break;
}
}
else
for (; pos != end && *pos != field_separator; pos++) ;
var_len= (uint) (pos - start);
uint find= cs ? find_type2(lib, start, var_len, cs) :
find_type(lib, start, var_len, (bool) 0);
if (!find)
{
*err_pos= (char*) start;
*err_len= var_len;
*set_warning= 1;
}
else
found|= ((longlong) 1 << (find - 1));
if (pos >= end)
break;
start= pos + mblen;
}
}
return found;
}
/*
Function to find a string in a TYPELIB
(Same format as mysys/typelib.c)
SYNOPSIS
find_type()
lib TYPELIB (struct of pointer to values + count)
find String to find
length Length of string to find
part_match Allow part matching of value
RETURN
0 error
> 0 position in TYPELIB->type_names +1
*/
uint find_type(TYPELIB *lib, const char *find, uint length, bool part_match)
{
uint found_count=0, found_pos=0;
const char *end= find+length;
const char *i;
const char *j;
for (uint pos=0 ; (j=lib->type_names[pos++]) ; )
{
for (i=find ; i != end &&
my_toupper(system_charset_info,*i) ==
my_toupper(system_charset_info,*j) ; i++, j++) ;
if (i == end)
{
if (! *j)
return(pos);
found_count++;
found_pos= pos;
}
}
return(found_count == 1 && part_match ? found_pos : 0);
}
/*
Find a string in a list of strings according to collation
SYNOPSIS
find_type2()
lib TYPELIB (struct of pointer to values + count)
x String to find
length String length
cs Character set + collation to use for comparison
NOTES
RETURN
0 No matching value
>0 Offset+1 in typelib for matched string
*/
uint find_type2(TYPELIB *typelib, const char *x, uint length, CHARSET_INFO *cs)
{
int pos;
const char *j;
DBUG_ENTER("find_type2");
DBUG_PRINT("enter",("x: '%.*s' lib: 0x%lx", length, x, (long) typelib));
if (!typelib->count)
{
DBUG_PRINT("exit",("no count"));
DBUG_RETURN(0);
}
for (pos=0 ; (j=typelib->type_names[pos]) ; pos++)
{
if (!my_strnncoll(cs, (const uchar*) x, length,
(const uchar*) j, typelib->type_lengths[pos]))
DBUG_RETURN(pos+1);
}
DBUG_PRINT("exit",("Couldn't find type"));
DBUG_RETURN(0);
} /* find_type */
/*
Un-hex all elements in a typelib
SYNOPSIS
unhex_type2()
interval TYPELIB (struct of pointer to values + lengths + count)
NOTES
RETURN
N/A
*/
void unhex_type2(TYPELIB *interval)
{
for (uint pos= 0; pos < interval->count; pos++)
{
char *from, *to;
for (from= to= (char*) interval->type_names[pos]; *from; )
{
/*
Note, hexchar_to_int(*from++) doesn't work
one some compilers, e.g. IRIX. Looks like a compiler
bug in inline functions in combination with arguments
that have a side effect. So, let's use from[0] and from[1]
and increment 'from' by two later.
*/
*to++= (char) (hexchar_to_int(from[0]) << 4) +
hexchar_to_int(from[1]);
from+= 2;
}
interval->type_lengths[pos] /= 2;
}
}
/*
Check if the first word in a string is one of the ones in TYPELIB
SYNOPSIS
check_word()
lib TYPELIB
val String to check
end End of input
end_of_word Store value of last used byte here if we found word
RETURN
0 No matching value
> 1 lib->type_names[#-1] matched
end_of_word will point to separator character/end in 'val'
*/
uint check_word(TYPELIB *lib, const char *val, const char *end,
const char **end_of_word)
{
int res;
const char *ptr;
/* Fiend end of word */
for (ptr= val ; ptr < end && my_isalpha(&my_charset_latin1, *ptr) ; ptr++)
;
if ((res=find_type(lib, val, (uint) (ptr - val), 1)) > 0)
*end_of_word= ptr;
return res;
}
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