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47707456 | 1 | /* Parse comma separate list into words. |
04277e02 | 2 | Copyright (C) 1996-2019 Free Software Foundation, Inc. |
47707456 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
2064087b | 5 | |
47707456 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
2064087b | 10 | |
47707456 UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
2064087b | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
2064087b RM |
19 | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | ||
f6f43da7 RM |
23 | #if !_LIBC |
24 | /* This code is written for inclusion in gnu-libc, and uses names in | |
25 | the namespace reserved for libc. If we're compiling in gnulib, | |
26 | define those names to be the normal ones instead. */ | |
27 | # include "strchrnul.h" | |
28 | # undef __strchrnul | |
29 | # define __strchrnul strchrnul | |
30 | #endif | |
2064087b RM |
31 | |
32 | /* Parse comma separated suboption from *OPTIONP and match against | |
33 | strings in TOKENS. If found return index and set *VALUEP to | |
34 | optional value introduced by an equal sign. If the suboption is | |
35 | not part of TOKENS return in *VALUEP beginning of unknown | |
36 | suboption. On exit *OPTIONP is set to the beginning of the next | |
47707456 | 37 | token or at the terminating NUL character. */ |
2064087b | 38 | int |
f6f43da7 | 39 | getsubopt (char **optionp, char *const *tokens, char **valuep) |
2064087b RM |
40 | { |
41 | char *endp, *vstart; | |
42 | int cnt; | |
43 | ||
44 | if (**optionp == '\0') | |
45 | return -1; | |
46 | ||
47 | /* Find end of next token. */ | |
c4563d2d | 48 | endp = __strchrnul (*optionp, ','); |
2064087b RM |
49 | |
50 | /* Find start of value. */ | |
51 | vstart = memchr (*optionp, '=', endp - *optionp); | |
52 | if (vstart == NULL) | |
53 | vstart = endp; | |
54 | ||
55 | /* Try to match the characters between *OPTIONP and VSTART against | |
56 | one of the TOKENS. */ | |
57 | for (cnt = 0; tokens[cnt] != NULL; ++cnt) | |
f6f43da7 | 58 | if (strncmp (*optionp, tokens[cnt], vstart - *optionp) == 0 |
2064087b RM |
59 | && tokens[cnt][vstart - *optionp] == '\0') |
60 | { | |
61 | /* We found the current option in TOKENS. */ | |
6952e59e | 62 | *valuep = vstart != endp ? vstart + 1 : NULL; |
2064087b RM |
63 | |
64 | if (*endp != '\0') | |
65 | *endp++ = '\0'; | |
66 | *optionp = endp; | |
67 | ||
68 | return cnt; | |
69 | } | |
70 | ||
71 | /* The current suboption does not match any option. */ | |
72 | *valuep = *optionp; | |
73 | ||
74 | if (*endp != '\0') | |
75 | *endp++ = '\0'; | |
76 | *optionp = endp; | |
77 | ||
78 | return -1; | |
79 | } |