53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
|
/* Searching a string for a character.
|
||
|
|
Copyright (C) 2007-2020 Free Software Foundation, Inc.
|
||
|
|
Written by Bruno Haible <bruno@clisp.org>, 2007.
|
||
|
|
|
||
|
|
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 3 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, see <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/* Specification. */
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include "mbuiter.h"
|
||
|
|
|
||
|
|
/* Locate the first single-byte character C in the character string STRING,
|
||
|
|
and return a pointer to it. Return NULL if C is not found in STRING. */
|
||
|
|
char *
|
||
|
|
mbschr (const char *string, int c)
|
||
|
|
{
|
||
|
|
if (MB_CUR_MAX > 1
|
||
|
|
/* Optimization: We know that ASCII characters < 0x30 don't occur as
|
||
|
|
part of multibyte characters longer than 1 byte. Hence, if c < 0x30,
|
||
|
|
the faster unibyte loop can be used. */
|
||
|
|
&& (unsigned char) c >= 0x30)
|
||
|
|
{
|
||
|
|
mbui_iterator_t iter;
|
||
|
|
|
||
|
|
for (mbui_init (iter, string);; mbui_advance (iter))
|
||
|
|
{
|
||
|
|
if (!mbui_avail (iter))
|
||
|
|
goto notfound;
|
||
|
|
if (mb_len (mbui_cur (iter)) == 1
|
||
|
|
&& (unsigned char) * mbui_cur_ptr (iter) == (unsigned char) c)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return (char *) mbui_cur_ptr (iter);
|
||
|
|
notfound:
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
return strchr (string, c);
|
||
|
|
}
|