/* Parse comma separate list into words. Copyright (C) 1996, 1997, 1999 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <stdlib.h> #include <string.h> libc_hidden_proto(memchr) libc_hidden_proto(memcmp) libc_hidden_proto(strchrnul) /* 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 (memcmp (*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; }