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 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 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 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 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 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 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 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
Indexes created Sat Sep 20 22:09:52 GMT 2025