1 /* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie 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 <unistd.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 /*
37 * The SVID interface to getsubopt provides no way of figuring out which
38 * part of the suboptions list wasn't matched. This makes error messages
39 * tricky... The extern variable suboptarg is a pointer to the token
40 * which didn't match.
41 */
42 char *suboptarg;
43
44 int
getsubopt(char ** optionp,char * const * tokens,char ** valuep)45 getsubopt(char **optionp, char * const *tokens, char **valuep)
46 {
47 int cnt;
48 char *p;
49
50 suboptarg = *valuep = NULL;
51
52 if (!optionp || !*optionp)
53 return(-1);
54
55 /* skip leading white-space, commas */
56 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
57
58 if (!*p) {
59 *optionp = p;
60 return(-1);
61 }
62
63 /* save the start of the token, and skip the rest of the token. */
64 for (suboptarg = p;
65 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
66
67 if (*p) {
68 /*
69 * If there's an equals sign, set the value pointer, and
70 * skip over the value part of the token. Terminate the
71 * token.
72 */
73 if (*p == '=') {
74 *p = '\0';
75 for (*valuep = ++p;
76 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
77 if (*p)
78 *p++ = '\0';
79 } else
80 *p++ = '\0';
81 /* Skip any whitespace or commas after this token. */
82 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
83 }
84
85 /* set optionp for next round. */
86 *optionp = p;
87
88 for (cnt = 0; *tokens; ++tokens, ++cnt)
89 if (!strcmp(suboptarg, *tokens))
90 return(cnt);
91 return(-1);
92 }
93