1 /* Parse comma separate 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 2, or (at your option)
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 along
17 with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
22 # include "getsubopt.h"
29 /* This code is written for inclusion in gnu-libc, and uses names in
30 the namespace reserved for libc. If we're compiling in gnulib,
31 define those names to be the normal ones instead. */
33 # define __strchrnul strchrnul
36 /* Parse comma separated suboption from *OPTIONP and match against
37 strings in TOKENS. If found return index and set *VALUEP to
38 optional value introduced by an equal sign. If the suboption is
39 not part of TOKENS return in *VALUEP beginning of unknown
40 suboption. On exit *OPTIONP is set to the beginning of the next
41 token or at the terminating NUL character. */
43 getsubopt (char **optionp, char *const *tokens, char **valuep)
48 if (**optionp == '\0')
51 /* Find end of next token. */
52 endp = __strchrnul (*optionp, ',');
54 /* Find start of value. */
55 vstart = memchr (*optionp, '=', endp - *optionp);
59 /* Try to match the characters between *OPTIONP and VSTART against
61 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
62 if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
63 && tokens[cnt][vstart - *optionp] == '\0')
65 /* We found the current option in TOKENS. */
66 *valuep = vstart != endp ? vstart + 1 : NULL;
75 /* The current suboption does not match any option. */