1 /* Parse comma separated list into words.
2 Copyright (C) 1996, 1997, 1999, 2004, 2007 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* This code is written for inclusion in gnu-libc, and uses names in
28 the namespace reserved for libc. If we're compiling in gnulib,
29 define those names to be the normal ones instead. */
31 # define __strchrnul strchrnul
34 /* Parse comma separated suboption from *OPTIONP and match against
35 strings in TOKENS. If found return index and set *VALUEP to
36 optional value introduced by an equal sign. If the suboption is
37 not part of TOKENS return in *VALUEP beginning of unknown
38 suboption. On exit *OPTIONP is set to the beginning of the next
39 token or at the terminating NUL character. */
41 getsubopt (char **optionp, char *const *tokens, char **valuep)
46 if (**optionp == '\0')
49 /* Find end of next token. */
50 endp = __strchrnul (*optionp, ',');
52 /* Find start of value. */
53 vstart = memchr (*optionp, '=', endp - *optionp);
57 /* Try to match the characters between *OPTIONP and VSTART against
59 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
60 if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
61 && tokens[cnt][vstart - *optionp] == '\0')
63 /* We found the current option in TOKENS. */
64 *valuep = vstart != endp ? vstart + 1 : NULL;
73 /* The current suboption does not match any option. */