| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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, write to the Free |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 19 | 02111-1307 USA. */ |
| 20 | |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | |
| 24 | |
| 25 | /* Parse comma separated suboption from *OPTIONP and match against |
| 26 | strings in TOKENS. If found return index and set *VALUEP to |
| 27 | optional value introduced by an equal sign. If the suboption is |
| 28 | not part of TOKENS return in *VALUEP beginning of unknown |
| 29 | suboption. On exit *OPTIONP is set to the beginning of the next |
| 30 | token or at the terminating NUL character. */ |
| 31 | int |
| 32 | getsubopt (char **optionp, char *const *tokens, char **valuep) |
| 33 | { |
| 34 | char *endp, *vstart; |
| 35 | int cnt; |
| 36 | |
| 37 | if (**optionp == '\0') |
| 38 | return -1; |
| 39 | |
| 40 | /* Find end of next token. */ |
| 41 | endp = strchrnul (*optionp, ','); |
| 42 | |
| 43 | /* Find start of value. */ |
| 44 | vstart = memchr (*optionp, '=', endp - *optionp); |
| 45 | if (vstart == NULL) |
| 46 | vstart = endp; |
| 47 | |
| 48 | /* Try to match the characters between *OPTIONP and VSTART against |
| 49 | one of the TOKENS. */ |
| 50 | for (cnt = 0; tokens[cnt] != NULL; ++cnt) |
| 51 | if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0 |
| 52 | && tokens[cnt][vstart - *optionp] == '\0') |
| 53 | { |
| 54 | /* We found the current option in TOKENS. */ |
| 55 | *valuep = vstart != endp ? vstart + 1 : NULL; |
| 56 | |
| 57 | if (*endp != '\0') |
| 58 | *endp++ = '\0'; |
| 59 | *optionp = endp; |
| 60 | |
| 61 | return cnt; |
| 62 | } |
| 63 | |
| 64 | /* The current suboption does not match any option. */ |
| 65 | *valuep = *optionp; |
| 66 | |
| 67 | if (*endp != '\0') |
| 68 | *endp++ = '\0'; |
| 69 | *optionp = endp; |
| 70 | |
| 71 | return -1; |
| 72 | } |