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glibc/stdlib/getsubopt.c
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/* Parse comma separate list into words. | |
Copyright (C) 1996-2016 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; | |
} |