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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* Parse comma separate list into words.
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Copyright (C) 1996-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <string.h>
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#if !_LIBC
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/* This code is written for inclusion in gnu-libc, and uses names in
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the namespace reserved for libc. If we're compiling in gnulib,
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define those names to be the normal ones instead. */
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# include "strchrnul.h"
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# undef __strchrnul
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# define __strchrnul strchrnul
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#endif
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/* Parse comma separated suboption from *OPTIONP and match against
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strings in TOKENS. If found return index and set *VALUEP to
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optional value introduced by an equal sign. If the suboption is
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not part of TOKENS return in *VALUEP beginning of unknown
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suboption. On exit *OPTIONP is set to the beginning of the next
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token or at the terminating NUL character. */
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int
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getsubopt (char **optionp, char *const *tokens, char **valuep)
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{
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char *endp, *vstart;
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int cnt;
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if (**optionp == '\0')
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return -1;
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/* Find end of next token. */
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endp = __strchrnul (*optionp, ',');
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/* Find start of value. */
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vstart = memchr (*optionp, '=', endp - *optionp);
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if (vstart == NULL)
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vstart = endp;
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/* Try to match the characters between *OPTIONP and VSTART against
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one of the TOKENS. */
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for (cnt = 0; tokens[cnt] != NULL; ++cnt)
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if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
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&& tokens[cnt][vstart - *optionp] == '\0')
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{
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/* We found the current option in TOKENS. */
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*valuep = vstart != endp ? vstart + 1 : NULL;
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if (*endp != '\0')
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*endp++ = '\0';
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*optionp = endp;
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return cnt;
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}
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/* The current suboption does not match any option. */
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*valuep = *optionp;
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if (*endp != '\0')
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*endp++ = '\0';
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*optionp = endp;
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return -1;
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}
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