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 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. */
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. */