1 /* Parse comma separated list into words.
2 Copyright (C) 1996-1997, 1999, 2004, 2007, 2009-2011 Free Software
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
28 /* This code is written for inclusion in gnu-libc, and uses names in
29 the namespace reserved for libc. If we're compiling in gnulib,
30 define those names to be the normal ones instead. */
32 # define __strchrnul strchrnul
35 /* Parse comma separated suboption from *OPTIONP and match against
36 strings in TOKENS. If found return index and set *VALUEP to
37 optional value introduced by an equal sign. If the suboption is
38 not part of TOKENS return in *VALUEP beginning of unknown
39 suboption. On exit *OPTIONP is set to the beginning of the next
40 token or at the terminating NUL character. */
42 getsubopt (char **optionp, char *const *tokens, char **valuep)
47 if (**optionp == '\0')
50 /* Find end of next token. */
51 endp = __strchrnul (*optionp, ',');
53 /* Find start of value. */
54 vstart = memchr (*optionp, '=', endp - *optionp);
58 /* Try to match the characters between *OPTIONP and VSTART against
60 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
61 if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
62 && tokens[cnt][vstart - *optionp] == '\0')
64 /* We found the current option in TOKENS. */
65 *valuep = vstart != endp ? vstart + 1 : NULL;
74 /* The current suboption does not match any option. */