1 /* $NetBSD: subr_optstr.c,v 1.7 2022/11/19 15:30:12 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: subr_optstr.c,v 1.7 2022/11/19 15:30:12 skrll Exp $");
34
35 #include <sys/param.h>
36 #include <sys/optstr.h>
37
38 /* --------------------------------------------------------------------- */
39
40 /*
41 * Given an options string of the form 'a=b c=d ... y=z' and a key,
42 * looks for the given key's value in the string and returns it in buf
43 * with a maximum of bufsize bytes. If the key is found, returns true;
44 * otherwise FALSE.
45 */
46 bool
47 optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
48 {
49 bool found = false;
50
51 /* Skip any initial spaces until we find a word. */
52 while (*optstr == ' ')
53 optstr++;
54
55 /* Search for the given key within the option string. */
56 while (!found && *optstr != '\0') {
57 const char *keyp;
58
59 /* Check if the next word matches the key. */
60 keyp = key;
61 while (*optstr == *keyp) {
62 optstr++;
63 keyp++;
64 }
65
66 if (*optstr == '=' && *keyp == '\0')
67 found = true;
68 else {
69 /* Key not found; skip until next space. */
70 while (*optstr != ' ' && *optstr != '\0')
71 optstr++;
72
73 /* And now skip until next word. */
74 while (*optstr == ' ')
75 optstr++;
76 }
77 }
78
79 /* If the key was found; copy its value to the target buffer. */
80 if (found) {
81 const char *lastbuf;
82
83 lastbuf = buf + (bufsize - 1);
84
85 optstr++; /* Skip '='. */
86 while (buf != lastbuf && *optstr != ' ' && *optstr != '\0')
87 *buf++ = *optstr++;
88 *buf = '\0';
89 }
90
91 return found;
92 }
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