1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)getsubopt.c 8.1 (Berkeley) 6/4/93";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <stdlib.h>
39 #include <string.h>
40
41 /*
42 * The SVID interface to getsubopt provides no way of figuring out which
43 * part of the suboptions list wasn't matched. This makes error messages
44 * tricky... The extern variable suboptarg is a pointer to the token
45 * which didn't match.
46 */
47 char *suboptarg;
48
49 int
getsubopt(char ** optionp,char * const * tokens,char ** valuep)50 getsubopt(char **optionp, char * const *tokens, char **valuep)
51 {
52 int cnt;
53 char *p;
54
55 suboptarg = *valuep = NULL;
56
57 if (!optionp || !*optionp)
58 return(-1);
59
60 /* skip leading white-space, commas */
61 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
62
63 if (!*p) {
64 *optionp = p;
65 return(-1);
66 }
67
68 /* save the start of the token, and skip the rest of the token. */
69 for (suboptarg = p;
70 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
71
72 if (*p) {
73 /*
74 * If there's an equals sign, set the value pointer, and
75 * skip over the value part of the token. Terminate the
76 * token.
77 */
78 if (*p == '=') {
79 *p = '\0';
80 for (*valuep = ++p;
81 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
82 if (*p)
83 *p++ = '\0';
84 } else
85 *p++ = '\0';
86 /* Skip any whitespace or commas after this token. */
87 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
88 }
89
90 /* set optionp for next round. */
91 *optionp = p;
92
93 for (cnt = 0; *tokens; ++tokens, ++cnt)
94 if (!strcmp(suboptarg, *tokens))
95 return(cnt);
96 return(-1);
97 }
98