getsubopt.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* getsubopt - parse suboptions from a flag argument.
*/
#pragma weak _getsubopt = getsubopt
#include "lint.h"
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
int
getsubopt(char **optionsp, char * const *tokens, char **valuep)
{
char *s = *optionsp, *p;
int i;
size_t optlen;
*valuep = NULL;
if (*s == '\0')
return (-1);
p = strchr(s, ','); /* find next option */
if (p == NULL) {
p = s + strlen(s);
} else {
*p++ = '\0'; /* mark end and point to next */
}
*optionsp = p; /* point to next option */
p = strchr(s, '='); /* find value */
if (p == NULL) {
optlen = strlen(s);
*valuep = NULL;
} else {
optlen = p - s;
*valuep = ++p;
}
for (i = 0; tokens[i] != NULL; i++) {
if ((optlen == strlen(tokens[i])) &&
(strncmp(s, tokens[i], optlen) == 0))
return (i);
}
/* no match, point value at option and return error */
*valuep = s;
return (-1);
}