1 /* $NetBSD: subr_optstr.c,v 1.8 2023/04/20 09:04:45 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 1.8 2023/04/20 09:04:45 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
47
48 static bool
optstr_get_pointer(const char * optstr,const char * key,const char ** result)49 optstr_get_pointer(const char *optstr, const char *key, const char **result)
50 {
51 bool found = false;
52
53 /* Skip any initial spaces or tabs until we find a word. */
54 while (*optstr == ' ' || *optstr == '\t')
55 optstr++;
56
57 /* Search for the given key within the option string. */
58 while (!found && *optstr != '\0') {
59 const char *keyp;
60
61 /* Check if the next word matches the key. */
62 keyp = key;
63 while (*optstr == *keyp) {
64 optstr++;
65 keyp++;
66 }
67
68 if (*optstr == '=' && *keyp == '\0')
69 found = true;
70 else {
71 /* Key not found; skip until next space. */
72 while (*optstr != ' ' && *optstr != '\0')
73 optstr++;
74
75 /* And now skip until next word. */
76 while (*optstr == ' ')
77 optstr++;
78 }
79 }
80
81 if (found) {
82 optstr++; /* Skip '='. */
83 *result = optstr;
84 }
85
86 return found;
87 }
88
89 bool
optstr_get(const char * optstr,const char * key,char * buf,size_t bufsize)90 optstr_get(const char *optstr, const char *key, char *buf, size_t bufsize)
91 {
92 const char *data;
93 bool found = optstr_get_pointer(optstr, key, &data);
94
95 /* If the key was found; copy its value to the target buffer. */
96 if (found) {
97 const char *lastbuf = buf + (bufsize - 1);
98
99 while (buf != lastbuf && *data != ' ' && *data != '\0')
100 *buf++ = *data++;
101 *buf = '\0';
102 }
103 return found;
104 }
105
106
107 bool
optstr_get_string(const char * optstr,const char * key,const char ** result)108 optstr_get_string(const char *optstr, const char *key, const char **result)
109 {
110 const char *data;
111 const bool found = optstr_get_pointer(optstr, key, &data);
112
113 /* If the key was found; copy its value to the target buffer. */
114 if (found) {
115 *result = data;
116 }
117 return found;
118 }
119
120 bool
optstr_get_number(const char * optstr,const char * key,unsigned long * result)121 optstr_get_number(const char *optstr, const char *key, unsigned long *result)
122 {
123 const char *data;
124 const bool found = optstr_get_pointer(optstr, key, &data);
125
126 /* If the key was found; copy its value to the target buffer. */
127 if (found) {
128 char *ep;
129 const unsigned long ulval = strtoul(data, &ep, 10);
130 if (ep == data)
131 return false;
132 *result = ulval;
133 return true;
134 }
135 return false;
136 }
137
138 bool
optstr_get_number_hex(const char * optstr,const char * key,unsigned long * result)139 optstr_get_number_hex(const char *optstr, const char *key,
140 unsigned long *result)
141 {
142 const char *data;
143 const bool found = optstr_get_pointer(optstr, key, &data);
144
145 /* If the key was found; copy its value to the target buffer. */
146 if (found) {
147 char *ep;
148 const unsigned long ulval = strtoul(data, &ep, 16);
149 if (ep == data)
150 return false;
151 *result = ulval;
152 return true;
153 }
154 return false;
155 }
156
157 bool
optstr_get_number_binary(const char * optstr,const char * key,unsigned long * result)158 optstr_get_number_binary(const char *optstr, const char *key,
159 unsigned long *result)
160 {
161 const char *data;
162 const bool found = optstr_get_pointer(optstr, key, &data);
163
164 /* If the key was found; copy its value to the target buffer. */
165 if (found) {
166 char *ep;
167 const unsigned long ulval = strtoul(data, &ep, 2);
168 if (ep == data)
169 return false;
170 *result = ulval;
171 return true;
172 }
173 return false;
174 }
175
176
177 #if NETHER > 0
178 bool
optstr_get_macaddr(const char * optstr,const char * key,uint8_t result[ETHER_ADDR_LEN])179 optstr_get_macaddr(const char *optstr, const char *key,
180 uint8_t result[ETHER_ADDR_LEN])
181 {
182 const char *data;
183 const bool found = optstr_get_pointer(optstr, key, &data);
184
185 /* If the key was found; copy its value to the target buffer. */
186 if (found) {
187 uint8_t temp[ETHER_ADDR_LEN];
188 int error = ether_aton_r(temp, sizeof(temp), data);
189 if (error)
190 return false;
191 memcpy(result, temp, sizeof(temp));
192 }
193 return found;
194 }
195 #endif
196