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/* Searching a string for a character among a given set of characters.
Copyright (C) 1999, 2002, 2006-2015 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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <string.h>
#include "mbuiter.h"
/* Find the first occurrence in the character string STRING of any character
in the character string ACCEPT. Return the number of bytes from the
beginning of the string to this occurrence, or to the end of the string
if none exists. */
size_t
mbscspn (const char *string, const char *accept)
{
/* Optimize two cases. */
if (accept[0] == '\0')
return strlen (string);
if (accept[1] == '\0')
{
const char *ptr = mbschr (string, accept[0]);
return (ptr != NULL ? ptr - string : strlen (string));
}
/* General case. */
if (MB_CUR_MAX > 1)
{
mbui_iterator_t iter;
for (mbui_init (iter, string); mbui_avail (iter); mbui_advance (iter))
{
if (mb_len (mbui_cur (iter)) == 1)
{
if (mbschr (accept, * mbui_cur_ptr (iter)))
goto found;
}
else
{
mbui_iterator_t aiter;
for (mbui_init (aiter, accept);
mbui_avail (aiter);
mbui_advance (aiter))
if (mb_equal (mbui_cur (aiter), mbui_cur (iter)))
goto found;
}
}
found:
return mbui_cur_ptr (iter) - string;
}
else
return strcspn (string, accept);
}
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