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103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/* Searching a string for a character among a given set of characters.
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Copyright (C) 1999, 2002, 2006-2026 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2007.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <string.h>
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#include <stdlib.h>
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#if GNULIB_MCEL_PREFER
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# include "mcel.h"
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#else
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# include "mbuiterf.h"
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#endif
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/* Find the first occurrence in the character string STRING of any character
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in the character string ACCEPT. Return the number of bytes from the
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beginning of the string to this occurrence, or to the end of the string
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if none exists. */
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size_t
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mbscspn (const char *string, const char *accept)
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{
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/* Optimize two cases. */
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if (accept[0] == '\0')
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return strlen (string);
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if (accept[1] == '\0')
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{
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const char *ptr = mbschr (string, accept[0]);
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return (ptr != NULL ? ptr - string : strlen (string));
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}
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/* General case. */
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if (MB_CUR_MAX > 1)
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{
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#if GNULIB_MCEL_PREFER
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size_t i;
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for (i = 0; string[i]; )
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{
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mcel_t g = mcel_scanz (string + i);
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if (g.len == 1)
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{
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if (mbschr (accept, string[i]))
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return i;
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}
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else
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for (char const *aiter = accept; *aiter; )
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{
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mcel_t a = mcel_scanz (aiter);
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if (mcel_eq (g, a))
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return i;
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aiter += a.len;
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}
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i += g.len;
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}
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return i;
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#else
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mbuif_state_t state;
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const char *iter;
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for (mbuif_init (state), iter = string; mbuif_avail (state, iter); )
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{
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mbchar_t cur = mbuif_next (state, iter);
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if (mb_len (cur) == 1)
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{
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if (mbschr (accept, *iter))
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goto found;
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}
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else
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{
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mbuif_state_t astate;
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const char *aiter;
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for (mbuif_init (astate), aiter = accept;
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mbuif_avail (astate, aiter); )
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{
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mbchar_t acur = mbuif_next (astate, aiter);
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if (mb_equal (acur, cur))
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goto found;
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aiter += mb_len (acur);
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}
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}
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iter += mb_len (cur);
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}
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found:
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return iter - string;
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#endif
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}
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else
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return strcspn (string, accept);
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}
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