1 /* Parse comma separate list into words.
2 Copyright (C) 1996, 1997, 1999, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library 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 GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20 #include <stdlib.h>
21 #include <string.h>
22
23
24 /* Parse comma separated suboption from *OPTIONP and match against
25 strings in TOKENS. If found return index and set *VALUEP to
26 optional value introduced by an equal sign. If the suboption is
27 not part of TOKENS return in *VALUEP beginning of unknown
28 suboption. On exit *OPTIONP is set to the beginning of the next
29 token or at the terminating NUL character. */
30 int
getsubopt(char ** optionp,char * const * tokens,char ** valuep)31 getsubopt (char **optionp, char *const *tokens, char **valuep)
32 {
33 char *endp, *vstart;
34 int cnt;
35
36 if (**optionp == '\0')
37 return -1;
38
39 /* Find end of next token. */
40 endp = strchrnul (*optionp, ',');
41
42 /* Find start of value. */
43 vstart = memchr (*optionp, '=', endp - *optionp);
44 if (vstart == NULL)
45 vstart = endp;
46
47 /* Try to match the characters between *OPTIONP and VSTART against
48 one of the TOKENS. */
49 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
50 if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0
51 && tokens[cnt][vstart - *optionp] == '\0')
52 {
53 /* We found the current option in TOKENS. */
54 *valuep = vstart != endp ? vstart + 1 : NULL;
55
56 if (*endp != '\0')
57 *endp++ = '\0';
58 *optionp = endp;
59
60 return cnt;
61 }
62
63 /* The current suboption does not match any option. */
64 *valuep = *optionp;
65
66 if (*endp != '\0')
67 *endp++ = '\0';
68 *optionp = endp;
69
70 return -1;
71 }
72