1/*-
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)getsubopt.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include <stdlib.h>
37#include <string.h>
38
39/*
40 * The SVID interface to getsubopt provides no way of figuring out which
41 * part of the suboptions list wasn't matched.  This makes error messages
42 * tricky...  The extern variable suboptarg is a pointer to the token
43 * which didn't match.
44 */
45char *suboptarg;
46
47int
48getsubopt(char **optionp, char * const *tokens, char **valuep)
49{
50	int cnt;
51	char *p;
52
53	suboptarg = *valuep = NULL;
54
55	if (!optionp || !*optionp)
56		return(-1);
57
58	/* skip leading white-space, commas */
59	for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
60
61	if (!*p) {
62		*optionp = p;
63		return(-1);
64	}
65
66	/* save the start of the token, and skip the rest of the token. */
67	for (suboptarg = p;
68	    *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
69
70	if (*p) {
71		/*
72		 * If there's an equals sign, set the value pointer, and
73		 * skip over the value part of the token.  Terminate the
74		 * token.
75		 */
76		if (*p == '=') {
77			*p = '\0';
78			for (*valuep = ++p;
79			    *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
80			if (*p)
81				*p++ = '\0';
82		} else
83			*p++ = '\0';
84		/* Skip any whitespace or commas after this token. */
85		for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
86	}
87
88	/* set optionp for next round. */
89	*optionp = p;
90
91	for (cnt = 0; *tokens; ++tokens, ++cnt)
92		if (!strcmp(suboptarg, *tokens))
93			return(cnt);
94	return(-1);
95}
96