1 /* Parse comma separate list into words.
2 Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 libc_hidden_proto(memchr)
26 libc_hidden_proto(memcmp)
27 libc_hidden_proto(strchrnul)
29 /* Parse comma separated suboption from *OPTIONP and match against
30 strings in TOKENS. If found return index and set *VALUEP to
31 optional value introduced by an equal sign. If the suboption is
32 not part of TOKENS return in *VALUEP beginning of unknown
33 suboption. On exit *OPTIONP is set to the beginning of the next
34 token or at the terminating NUL character. */
35 int getsubopt(char **optionp, char *const *tokens, char **valuep)
40 if (**optionp == '\0')
43 /* Find end of next token. */
44 endp = strchrnul (*optionp, ',');
46 /* Find start of value. */
47 vstart = memchr (*optionp, '=', endp - *optionp);
51 /* Try to match the characters between *OPTIONP and VSTART against
53 for (cnt = 0; tokens[cnt] != NULL; ++cnt)
54 if (memcmp (*optionp, tokens[cnt], vstart - *optionp) == 0
55 && tokens[cnt][vstart - *optionp] == '\0')
57 /* We found the current option in TOKENS. */
58 *valuep = vstart != endp ? vstart + 1 : NULL;
67 /* The current suboption does not match any option. */