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