1/*	$Id: compat_getsubopt.c,v 1.6 2020/06/15 01:37:15 schwarze Exp $ */
2/*	$OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $	*/
3
4/*-
5 * Copyright (c) 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32#include "config.h"
33
34#include <unistd.h>
35#include <stdlib.h>
36#include <string.h>
37
38int
39getsubopt(char **optionp, char * const *tokens, char **valuep)
40{
41	int cnt;
42	char *suboptarg;
43	char *p;
44
45	suboptarg = *valuep = NULL;
46
47	if (!optionp || !*optionp)
48		return(-1);
49
50	/* skip leading white-space, commas */
51	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
52
53	if (!*p) {
54		*optionp = p;
55		return(-1);
56	}
57
58	/* save the start of the token, and skip the rest of the token. */
59	for (suboptarg = p;
60	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
61
62	if (*p) {
63		/*
64		 * If there's an equals sign, set the value pointer, and
65		 * skip over the value part of the token.  Terminate the
66		 * token.
67		 */
68		if (*p == '=') {
69			*p = '\0';
70			for (*valuep = ++p;
71			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
72			if (*p)
73				*p++ = '\0';
74		} else
75			*p++ = '\0';
76		/* Skip any whitespace or commas after this token. */
77		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
78	}
79
80	/* set optionp for next round. */
81	*optionp = p;
82
83	for (cnt = 0; *tokens; ++tokens, ++cnt)
84		if (!strcmp(suboptarg, *tokens))
85			return(cnt);
86	return(-1);
87}
88