1 /* $NetBSD: getsubopt.c,v 1.10 2018/08/30 12:06:06 christos 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 #if HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 #if defined(LIBC_SCCS) && !defined(lint)
38 #if 0
39 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93";
40 #else
41 __RCSID("$NetBSD: getsubopt.c,v 1.10 2018/08/30 12:06:06 christos Exp $");
42 #endif
43 #endif /* LIBC_SCCS and not lint */
44
45 #include "namespace.h"
46
47 #include <assert.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51
52 #ifdef __weak_alias
__weak_alias(getsubopt,_getsubopt)53 __weak_alias(getsubopt,_getsubopt)
54 #endif
55
56 /*
57 * The SVID interface to getsubopt provides no way of figuring out which
58 * part of the suboptions list wasn't matched. This makes error messages
59 * tricky... The extern variable suboptarg is a pointer to the token
60 * which didn't match.
61 */
62 char *suboptarg;
63
64 int
65 getsubopt(char **optionp, char * const *tokens, char **valuep)
66 {
67 int cnt;
68 char *p;
69
70 _DIAGASSERT(tokens != NULL);
71 _DIAGASSERT(valuep != NULL);
72 /* optionp is tested below */
73
74 suboptarg = *valuep = NULL;
75
76 if (!optionp || !*optionp)
77 return(-1);
78
79 /* skip leading white-space, commas */
80 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
81
82 if (!*p) {
83 *optionp = p;
84 return(-1);
85 }
86
87 /* save the start of the token, and skip the rest of the token. */
88 for (suboptarg = p;
89 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
90
91 if (*p) {
92 /*
93 * If there's an equals sign, set the value pointer, and
94 * skip over the value part of the token. Terminate the
95 * token.
96 */
97 if (*p == '=') {
98 *p = '\0';
99 for (*valuep = ++p;
100 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
101 if (*p)
102 *p++ = '\0';
103 } else
104 *p++ = '\0';
105 /* Skip any whitespace or commas after this token. */
106 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
107 }
108
109 /* set optionp for next round. */
110 *optionp = p;
111
112 for (cnt = 0; *tokens; ++tokens, ++cnt)
113 if (!strcmp(suboptarg, *tokens))
114 return(cnt);
115 return(-1);
116 }
117