1 /* $NetBSD: getsubopt.c,v 1.9 2012/06/25 22:32:45 abs Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: getsubopt.c,v 1.9 2012/06/25 22:32:45 abs Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42
43 #include <assert.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47
48 #ifdef __weak_alias
__weak_alias(getsubopt,_getsubopt)49 __weak_alias(getsubopt,_getsubopt)
50 #endif
51
52 /*
53 * The SVID interface to getsubopt provides no way of figuring out which
54 * part of the suboptions list wasn't matched. This makes error messages
55 * tricky... The extern variable suboptarg is a pointer to the token
56 * which didn't match.
57 */
58 char *suboptarg;
59
60 int
61 getsubopt(char **optionp, char * const *tokens, char **valuep)
62 {
63 int cnt;
64 char *p;
65
66 _DIAGASSERT(tokens != NULL);
67 _DIAGASSERT(valuep != NULL);
68 /* optionp is tested below */
69
70 suboptarg = *valuep = NULL;
71
72 if (!optionp || !*optionp)
73 return(-1);
74
75 /* skip leading white-space, commas */
76 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
77
78 if (!*p) {
79 *optionp = p;
80 return(-1);
81 }
82
83 /* save the start of the token, and skip the rest of the token. */
84 for (suboptarg = p;
85 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
86
87 if (*p) {
88 /*
89 * If there's an equals sign, set the value pointer, and
90 * skip over the value part of the token. Terminate the
91 * token.
92 */
93 if (*p == '=') {
94 *p = '\0';
95 for (*valuep = ++p;
96 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
97 if (*p)
98 *p++ = '\0';
99 } else
100 *p++ = '\0';
101 /* Skip any whitespace or commas after this token. */
102 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
103 }
104
105 /* set optionp for next round. */
106 *optionp = p;
107
108 for (cnt = 0; *tokens; ++tokens, ++cnt)
109 if (!strcmp(suboptarg, *tokens))
110 return(cnt);
111 return(-1);
112 }
113