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 * @(#)getsubopt.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/stdlib/getsubopt.c,v 1.7 2007/01/09 00:28:10 imp Exp $
31 * $DragonFly: src/lib/libc/stdlib/getsubopt.c,v 1.4 2005/11/20 12:37:48 swildner Exp $
32 */
33
34 #include <stdlib.h>
35 #include <string.h>
36
37 /*
38 * The SVID interface to getsubopt provides no way of figuring out which
39 * part of the suboptions list wasn't matched. This makes error messages
40 * tricky... The extern variable suboptarg is a pointer to the token
41 * which didn't match.
42 */
43 char *suboptarg;
44
45 int
getsubopt(char ** optionp,char * const * tokens,char ** valuep)46 getsubopt(char **optionp, char * const *tokens, char **valuep)
47 {
48 int cnt;
49 char *p;
50
51 suboptarg = *valuep = NULL;
52
53 if (!optionp || !*optionp)
54 return(-1);
55
56 /* skip leading white-space, commas */
57 for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
58
59 if (!*p) {
60 *optionp = p;
61 return(-1);
62 }
63
64 /* save the start of the token, and skip the rest of the token. */
65 for (suboptarg = p;
66 *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';);
67
68 if (*p) {
69 /*
70 * If there's an equals sign, set the value pointer, and
71 * skip over the value part of the token. Terminate the
72 * token.
73 */
74 if (*p == '=') {
75 *p = '\0';
76 for (*valuep = ++p;
77 *p && *p != ',' && *p != ' ' && *p != '\t'; ++p);
78 if (*p)
79 *p++ = '\0';
80 } else
81 *p++ = '\0';
82 /* Skip any whitespace or commas after this token. */
83 for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p);
84 }
85
86 /* set optionp for next round. */
87 *optionp = p;
88
89 for (cnt = 0; *tokens; ++tokens, ++cnt)
90 if (!strcmp(suboptarg, *tokens))
91 return(cnt);
92 return(-1);
93 }
94