| /* Parse comma separate list into words. |
| Copyright (C) 1996-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #if !_LIBC |
| /* This code is written for inclusion in gnu-libc, and uses names in |
| the namespace reserved for libc. If we're compiling in gnulib, |
| define those names to be the normal ones instead. */ |
| # include "strchrnul.h" |
| # undef __strchrnul |
| # define __strchrnul strchrnul |
| #endif |
| |
| /* Parse comma separated suboption from *OPTIONP and match against |
| strings in TOKENS. If found return index and set *VALUEP to |
| optional value introduced by an equal sign. If the suboption is |
| not part of TOKENS return in *VALUEP beginning of unknown |
| suboption. On exit *OPTIONP is set to the beginning of the next |
| token or at the terminating NUL character. */ |
| int |
| getsubopt (char **optionp, char *const *tokens, char **valuep) |
| { |
| char *endp, *vstart; |
| int cnt; |
| |
| if (**optionp == '\0') |
| return -1; |
| |
| /* Find end of next token. */ |
| endp = __strchrnul (*optionp, ','); |
| |
| /* Find start of value. */ |
| vstart = memchr (*optionp, '=', endp - *optionp); |
| if (vstart == NULL) |
| vstart = endp; |
| |
| /* Try to match the characters between *OPTIONP and VSTART against |
| one of the TOKENS. */ |
| for (cnt = 0; tokens[cnt] != NULL; ++cnt) |
| if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0 |
| && tokens[cnt][vstart - *optionp] == '\0') |
| { |
| /* We found the current option in TOKENS. */ |
| *valuep = vstart != endp ? vstart + 1 : NULL; |
| |
| if (*endp != '\0') |
| *endp++ = '\0'; |
| *optionp = endp; |
| |
| return cnt; |
| } |
| |
| /* The current suboption does not match any option. */ |
| *valuep = *optionp; |
| |
| if (*endp != '\0') |
| *endp++ = '\0'; |
| *optionp = endp; |
| |
| return -1; |
| } |