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/* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
/*
* The SVID interface to getsubopt provides no way of figuring out which
* part of the suboptions list wasn't matched. This makes error messages
* tricky... The extern variable suboptarg is a pointer to the token
* which didn't match.
*/
char *suboptarg;
int
getsubopt(char **optionp, char * const *tokens, char **valuep)
{
int cnt;
char *p;
suboptarg = *valuep = NULL;
if (!optionp || !*optionp)
return(-1);
/* skip leading white-space, commas */
for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
if (!*p) {
*optionp = p;
return(-1);
}
/* save the start of the token, and skip the rest of the token. */
for (suboptarg = p;
*++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
if (*p) {
/*
* If there's an equals sign, set the value pointer, and
* skip over the value part of the token. Terminate the
* token.
*/
if (*p == '=') {
*p = '\0';
for (*valuep = ++p;
*p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
if (*p)
*p++ = '\0';
} else
*p++ = '\0';
/* Skip any whitespace or commas after this token. */
for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
}
/* set optionp for next round. */
*optionp = p;
for (cnt = 0; *tokens; ++tokens, ++cnt)
if (!strcmp(suboptarg, *tokens))
return(cnt);
return(-1);
}
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