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NetServices/lwip/core/ipv4/ip_addr.c@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1 /**
hendrikvincent 0:05ccbd4f84f1 2 * @file
hendrikvincent 0:05ccbd4f84f1 3 * This is the IPv4 address tools implementation.
hendrikvincent 0:05ccbd4f84f1 4 *
hendrikvincent 0:05ccbd4f84f1 5 */
hendrikvincent 0:05ccbd4f84f1 6
hendrikvincent 0:05ccbd4f84f1 7 /*
hendrikvincent 0:05ccbd4f84f1 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
hendrikvincent 0:05ccbd4f84f1 9 * All rights reserved.
hendrikvincent 0:05ccbd4f84f1 10 *
hendrikvincent 0:05ccbd4f84f1 11 * Redistribution and use in source and binary forms, with or without modification,
hendrikvincent 0:05ccbd4f84f1 12 * are permitted provided that the following conditions are met:
hendrikvincent 0:05ccbd4f84f1 13 *
hendrikvincent 0:05ccbd4f84f1 14 * 1. Redistributions of source code must retain the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 15 * this list of conditions and the following disclaimer.
hendrikvincent 0:05ccbd4f84f1 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
hendrikvincent 0:05ccbd4f84f1 17 * this list of conditions and the following disclaimer in the documentation
hendrikvincent 0:05ccbd4f84f1 18 * and/or other materials provided with the distribution.
hendrikvincent 0:05ccbd4f84f1 19 * 3. The name of the author may not be used to endorse or promote products
hendrikvincent 0:05ccbd4f84f1 20 * derived from this software without specific prior written permission.
hendrikvincent 0:05ccbd4f84f1 21 *
hendrikvincent 0:05ccbd4f84f1 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hendrikvincent 0:05ccbd4f84f1 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hendrikvincent 0:05ccbd4f84f1 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hendrikvincent 0:05ccbd4f84f1 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hendrikvincent 0:05ccbd4f84f1 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hendrikvincent 0:05ccbd4f84f1 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hendrikvincent 0:05ccbd4f84f1 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hendrikvincent 0:05ccbd4f84f1 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hendrikvincent 0:05ccbd4f84f1 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hendrikvincent 0:05ccbd4f84f1 31 * OF SUCH DAMAGE.
hendrikvincent 0:05ccbd4f84f1 32 *
hendrikvincent 0:05ccbd4f84f1 33 * This file is part of the lwIP TCP/IP stack.
hendrikvincent 0:05ccbd4f84f1 34 *
hendrikvincent 0:05ccbd4f84f1 35 * Author: Adam Dunkels <adam@sics.se>
hendrikvincent 0:05ccbd4f84f1 36 *
hendrikvincent 0:05ccbd4f84f1 37 */
hendrikvincent 0:05ccbd4f84f1 38
hendrikvincent 0:05ccbd4f84f1 39 #include "lwip/opt.h"
hendrikvincent 0:05ccbd4f84f1 40 #include "lwip/ip_addr.h"
hendrikvincent 0:05ccbd4f84f1 41 #include "lwip/netif.h"
hendrikvincent 0:05ccbd4f84f1 42
hendrikvincent 0:05ccbd4f84f1 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
hendrikvincent 0:05ccbd4f84f1 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
hendrikvincent 0:05ccbd4f84f1 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
hendrikvincent 0:05ccbd4f84f1 46
hendrikvincent 0:05ccbd4f84f1 47 /**
hendrikvincent 0:05ccbd4f84f1 48 * Determine if an address is a broadcast address on a network interface
hendrikvincent 0:05ccbd4f84f1 49 *
hendrikvincent 0:05ccbd4f84f1 50 * @param addr address to be checked
hendrikvincent 0:05ccbd4f84f1 51 * @param netif the network interface against which the address is checked
hendrikvincent 0:05ccbd4f84f1 52 * @return returns non-zero if the address is a broadcast address
hendrikvincent 0:05ccbd4f84f1 53 */
hendrikvincent 0:05ccbd4f84f1 54 u8_t
hendrikvincent 0:05ccbd4f84f1 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
hendrikvincent 0:05ccbd4f84f1 56 {
hendrikvincent 0:05ccbd4f84f1 57 ip_addr_t ipaddr;
hendrikvincent 0:05ccbd4f84f1 58 ip4_addr_set_u32(&ipaddr, addr);
hendrikvincent 0:05ccbd4f84f1 59
hendrikvincent 0:05ccbd4f84f1 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
hendrikvincent 0:05ccbd4f84f1 61 if ((~addr == IPADDR_ANY) ||
hendrikvincent 0:05ccbd4f84f1 62 (addr == IPADDR_ANY)) {
hendrikvincent 0:05ccbd4f84f1 63 return 1;
hendrikvincent 0:05ccbd4f84f1 64 /* no broadcast support on this network interface? */
hendrikvincent 0:05ccbd4f84f1 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
hendrikvincent 0:05ccbd4f84f1 66 /* the given address cannot be a broadcast address
hendrikvincent 0:05ccbd4f84f1 67 * nor can we check against any broadcast addresses */
hendrikvincent 0:05ccbd4f84f1 68 return 0;
hendrikvincent 0:05ccbd4f84f1 69 /* address matches network interface address exactly? => no broadcast */
hendrikvincent 0:05ccbd4f84f1 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
hendrikvincent 0:05ccbd4f84f1 71 return 0;
hendrikvincent 0:05ccbd4f84f1 72 /* on the same (sub) network... */
hendrikvincent 0:05ccbd4f84f1 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
hendrikvincent 0:05ccbd4f84f1 74 /* ...and host identifier bits are all ones? =>... */
hendrikvincent 0:05ccbd4f84f1 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
hendrikvincent 0:05ccbd4f84f1 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
hendrikvincent 0:05ccbd4f84f1 77 /* => network broadcast address */
hendrikvincent 0:05ccbd4f84f1 78 return 1;
hendrikvincent 0:05ccbd4f84f1 79 } else {
hendrikvincent 0:05ccbd4f84f1 80 return 0;
hendrikvincent 0:05ccbd4f84f1 81 }
hendrikvincent 0:05ccbd4f84f1 82 }
hendrikvincent 0:05ccbd4f84f1 83
hendrikvincent 0:05ccbd4f84f1 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
hendrikvincent 0:05ccbd4f84f1 85 *
hendrikvincent 0:05ccbd4f84f1 86 * @param netmask the IPv4 netmask to check (in network byte order!)
hendrikvincent 0:05ccbd4f84f1 87 * @return 1 if the netmask is valid, 0 if it is not
hendrikvincent 0:05ccbd4f84f1 88 */
hendrikvincent 0:05ccbd4f84f1 89 u8_t
hendrikvincent 0:05ccbd4f84f1 90 ip4_addr_netmask_valid(u32_t netmask)
hendrikvincent 0:05ccbd4f84f1 91 {
hendrikvincent 0:05ccbd4f84f1 92 u32_t mask;
hendrikvincent 0:05ccbd4f84f1 93 u32_t nm_hostorder = lwip_htonl(netmask);
hendrikvincent 0:05ccbd4f84f1 94
hendrikvincent 0:05ccbd4f84f1 95 /* first, check for the first zero */
hendrikvincent 0:05ccbd4f84f1 96 for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
hendrikvincent 0:05ccbd4f84f1 97 if ((nm_hostorder & mask) == 0) {
hendrikvincent 0:05ccbd4f84f1 98 break;
hendrikvincent 0:05ccbd4f84f1 99 }
hendrikvincent 0:05ccbd4f84f1 100 }
hendrikvincent 0:05ccbd4f84f1 101 /* then check that there is no one */
hendrikvincent 0:05ccbd4f84f1 102 for (; mask != 0; mask >>= 1) {
hendrikvincent 0:05ccbd4f84f1 103 if ((nm_hostorder & mask) != 0) {
hendrikvincent 0:05ccbd4f84f1 104 /* there is a one after the first zero -> invalid */
hendrikvincent 0:05ccbd4f84f1 105 return 0;
hendrikvincent 0:05ccbd4f84f1 106 }
hendrikvincent 0:05ccbd4f84f1 107 }
hendrikvincent 0:05ccbd4f84f1 108 /* no one after the first zero -> valid */
hendrikvincent 0:05ccbd4f84f1 109 return 1;
hendrikvincent 0:05ccbd4f84f1 110 }
hendrikvincent 0:05ccbd4f84f1 111
hendrikvincent 0:05ccbd4f84f1 112 /* Here for now until needed in other places in lwIP */
hendrikvincent 0:05ccbd4f84f1 113 #ifndef isprint
hendrikvincent 0:05ccbd4f84f1 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
hendrikvincent 0:05ccbd4f84f1 115 #define isprint(c) in_range(c, 0x20, 0x7f)
hendrikvincent 0:05ccbd4f84f1 116 #define isdigit(c) in_range(c, '0', '9')
hendrikvincent 0:05ccbd4f84f1 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
hendrikvincent 0:05ccbd4f84f1 118 #define islower(c) in_range(c, 'a', 'z')
hendrikvincent 0:05ccbd4f84f1 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
hendrikvincent 0:05ccbd4f84f1 120 #endif
hendrikvincent 0:05ccbd4f84f1 121
hendrikvincent 0:05ccbd4f84f1 122 /**
hendrikvincent 0:05ccbd4f84f1 123 * Ascii internet address interpretation routine.
hendrikvincent 0:05ccbd4f84f1 124 * The value returned is in network order.
hendrikvincent 0:05ccbd4f84f1 125 *
hendrikvincent 0:05ccbd4f84f1 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
hendrikvincent 0:05ccbd4f84f1 127 * @return ip address in network order
hendrikvincent 0:05ccbd4f84f1 128 */
hendrikvincent 0:05ccbd4f84f1 129 u32_t
hendrikvincent 0:05ccbd4f84f1 130 ipaddr_addr(const char *cp)
hendrikvincent 0:05ccbd4f84f1 131 {
hendrikvincent 0:05ccbd4f84f1 132 ip_addr_t val;
hendrikvincent 0:05ccbd4f84f1 133
hendrikvincent 0:05ccbd4f84f1 134 if (ipaddr_aton(cp, &val)) {
hendrikvincent 0:05ccbd4f84f1 135 return ip4_addr_get_u32(&val);
hendrikvincent 0:05ccbd4f84f1 136 }
hendrikvincent 0:05ccbd4f84f1 137 return (IPADDR_NONE);
hendrikvincent 0:05ccbd4f84f1 138 }
hendrikvincent 0:05ccbd4f84f1 139
hendrikvincent 0:05ccbd4f84f1 140 /**
hendrikvincent 0:05ccbd4f84f1 141 * Check whether "cp" is a valid ascii representation
hendrikvincent 0:05ccbd4f84f1 142 * of an Internet address and convert to a binary address.
hendrikvincent 0:05ccbd4f84f1 143 * Returns 1 if the address is valid, 0 if not.
hendrikvincent 0:05ccbd4f84f1 144 * This replaces inet_addr, the return value from which
hendrikvincent 0:05ccbd4f84f1 145 * cannot distinguish between failure and a local broadcast address.
hendrikvincent 0:05ccbd4f84f1 146 *
hendrikvincent 0:05ccbd4f84f1 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
hendrikvincent 0:05ccbd4f84f1 148 * @param addr pointer to which to save the ip address in network order
hendrikvincent 0:05ccbd4f84f1 149 * @return 1 if cp could be converted to addr, 0 on failure
hendrikvincent 0:05ccbd4f84f1 150 */
hendrikvincent 0:05ccbd4f84f1 151 int
hendrikvincent 0:05ccbd4f84f1 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
hendrikvincent 0:05ccbd4f84f1 153 {
hendrikvincent 0:05ccbd4f84f1 154 u32_t val;
hendrikvincent 0:05ccbd4f84f1 155 u8_t base;
hendrikvincent 0:05ccbd4f84f1 156 char c;
hendrikvincent 0:05ccbd4f84f1 157 u32_t parts[4];
hendrikvincent 0:05ccbd4f84f1 158 u32_t *pp = parts;
hendrikvincent 0:05ccbd4f84f1 159
hendrikvincent 0:05ccbd4f84f1 160 c = *cp;
hendrikvincent 0:05ccbd4f84f1 161 for (;;) {
hendrikvincent 0:05ccbd4f84f1 162 /*
hendrikvincent 0:05ccbd4f84f1 163 * Collect number up to ``.''.
hendrikvincent 0:05ccbd4f84f1 164 * Values are specified as for C:
hendrikvincent 0:05ccbd4f84f1 165 * 0x=hex, 0=octal, 1-9=decimal.
hendrikvincent 0:05ccbd4f84f1 166 */
hendrikvincent 0:05ccbd4f84f1 167 if (!isdigit(c))
hendrikvincent 0:05ccbd4f84f1 168 return (0);
hendrikvincent 0:05ccbd4f84f1 169 val = 0;
hendrikvincent 0:05ccbd4f84f1 170 base = 10;
hendrikvincent 0:05ccbd4f84f1 171 if (c == '0') {
hendrikvincent 0:05ccbd4f84f1 172 c = *++cp;
hendrikvincent 0:05ccbd4f84f1 173 if (c == 'x' || c == 'X') {
hendrikvincent 0:05ccbd4f84f1 174 base = 16;
hendrikvincent 0:05ccbd4f84f1 175 c = *++cp;
hendrikvincent 0:05ccbd4f84f1 176 } else
hendrikvincent 0:05ccbd4f84f1 177 base = 8;
hendrikvincent 0:05ccbd4f84f1 178 }
hendrikvincent 0:05ccbd4f84f1 179 for (;;) {
hendrikvincent 0:05ccbd4f84f1 180 if (isdigit(c)) {
hendrikvincent 0:05ccbd4f84f1 181 val = (val * base) + (int)(c - '0');
hendrikvincent 0:05ccbd4f84f1 182 c = *++cp;
hendrikvincent 0:05ccbd4f84f1 183 } else if (base == 16 && isxdigit(c)) {
hendrikvincent 0:05ccbd4f84f1 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
hendrikvincent 0:05ccbd4f84f1 185 c = *++cp;
hendrikvincent 0:05ccbd4f84f1 186 } else
hendrikvincent 0:05ccbd4f84f1 187 break;
hendrikvincent 0:05ccbd4f84f1 188 }
hendrikvincent 0:05ccbd4f84f1 189 if (c == '.') {
hendrikvincent 0:05ccbd4f84f1 190 /*
hendrikvincent 0:05ccbd4f84f1 191 * Internet format:
hendrikvincent 0:05ccbd4f84f1 192 * a.b.c.d
hendrikvincent 0:05ccbd4f84f1 193 * a.b.c (with c treated as 16 bits)
hendrikvincent 0:05ccbd4f84f1 194 * a.b (with b treated as 24 bits)
hendrikvincent 0:05ccbd4f84f1 195 */
hendrikvincent 0:05ccbd4f84f1 196 if (pp >= parts + 3) {
hendrikvincent 0:05ccbd4f84f1 197 return (0);
hendrikvincent 0:05ccbd4f84f1 198 }
hendrikvincent 0:05ccbd4f84f1 199 *pp++ = val;
hendrikvincent 0:05ccbd4f84f1 200 c = *++cp;
hendrikvincent 0:05ccbd4f84f1 201 } else
hendrikvincent 0:05ccbd4f84f1 202 break;
hendrikvincent 0:05ccbd4f84f1 203 }
hendrikvincent 0:05ccbd4f84f1 204 /*
hendrikvincent 0:05ccbd4f84f1 205 * Check for trailing characters.
hendrikvincent 0:05ccbd4f84f1 206 */
hendrikvincent 0:05ccbd4f84f1 207 if (c != '\0' && !isspace(c)) {
hendrikvincent 0:05ccbd4f84f1 208 return (0);
hendrikvincent 0:05ccbd4f84f1 209 }
hendrikvincent 0:05ccbd4f84f1 210 /*
hendrikvincent 0:05ccbd4f84f1 211 * Concoct the address according to
hendrikvincent 0:05ccbd4f84f1 212 * the number of parts specified.
hendrikvincent 0:05ccbd4f84f1 213 */
hendrikvincent 0:05ccbd4f84f1 214 switch (pp - parts + 1) {
hendrikvincent 0:05ccbd4f84f1 215
hendrikvincent 0:05ccbd4f84f1 216 case 0:
hendrikvincent 0:05ccbd4f84f1 217 return (0); /* initial nondigit */
hendrikvincent 0:05ccbd4f84f1 218
hendrikvincent 0:05ccbd4f84f1 219 case 1: /* a -- 32 bits */
hendrikvincent 0:05ccbd4f84f1 220 break;
hendrikvincent 0:05ccbd4f84f1 221
hendrikvincent 0:05ccbd4f84f1 222 case 2: /* a.b -- 8.24 bits */
hendrikvincent 0:05ccbd4f84f1 223 if (val > 0xffffffUL) {
hendrikvincent 0:05ccbd4f84f1 224 return (0);
hendrikvincent 0:05ccbd4f84f1 225 }
hendrikvincent 0:05ccbd4f84f1 226 val |= parts[0] << 24;
hendrikvincent 0:05ccbd4f84f1 227 break;
hendrikvincent 0:05ccbd4f84f1 228
hendrikvincent 0:05ccbd4f84f1 229 case 3: /* a.b.c -- 8.8.16 bits */
hendrikvincent 0:05ccbd4f84f1 230 if (val > 0xffff) {
hendrikvincent 0:05ccbd4f84f1 231 return (0);
hendrikvincent 0:05ccbd4f84f1 232 }
hendrikvincent 0:05ccbd4f84f1 233 val |= (parts[0] << 24) | (parts[1] << 16);
hendrikvincent 0:05ccbd4f84f1 234 break;
hendrikvincent 0:05ccbd4f84f1 235
hendrikvincent 0:05ccbd4f84f1 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
hendrikvincent 0:05ccbd4f84f1 237 if (val > 0xff) {
hendrikvincent 0:05ccbd4f84f1 238 return (0);
hendrikvincent 0:05ccbd4f84f1 239 }
hendrikvincent 0:05ccbd4f84f1 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
hendrikvincent 0:05ccbd4f84f1 241 break;
hendrikvincent 0:05ccbd4f84f1 242 default:
hendrikvincent 0:05ccbd4f84f1 243 LWIP_ASSERT("unhandled", 0);
hendrikvincent 0:05ccbd4f84f1 244 break;
hendrikvincent 0:05ccbd4f84f1 245 }
hendrikvincent 0:05ccbd4f84f1 246 if (addr) {
hendrikvincent 0:05ccbd4f84f1 247 ip4_addr_set_u32(addr, htonl(val));
hendrikvincent 0:05ccbd4f84f1 248 }
hendrikvincent 0:05ccbd4f84f1 249 return (1);
hendrikvincent 0:05ccbd4f84f1 250 }
hendrikvincent 0:05ccbd4f84f1 251
hendrikvincent 0:05ccbd4f84f1 252 /**
hendrikvincent 0:05ccbd4f84f1 253 * Convert numeric IP address into decimal dotted ASCII representation.
hendrikvincent 0:05ccbd4f84f1 254 * returns ptr to static buffer; not reentrant!
hendrikvincent 0:05ccbd4f84f1 255 *
hendrikvincent 0:05ccbd4f84f1 256 * @param addr ip address in network order to convert
hendrikvincent 0:05ccbd4f84f1 257 * @return pointer to a global static (!) buffer that holds the ASCII
hendrikvincent 0:05ccbd4f84f1 258 * represenation of addr
hendrikvincent 0:05ccbd4f84f1 259 */
hendrikvincent 0:05ccbd4f84f1 260 char *
hendrikvincent 0:05ccbd4f84f1 261 ipaddr_ntoa(const ip_addr_t *addr)
hendrikvincent 0:05ccbd4f84f1 262 {
hendrikvincent 0:05ccbd4f84f1 263 static char str[16];
hendrikvincent 0:05ccbd4f84f1 264 return ipaddr_ntoa_r(addr, str, 16);
hendrikvincent 0:05ccbd4f84f1 265 }
hendrikvincent 0:05ccbd4f84f1 266
hendrikvincent 0:05ccbd4f84f1 267 /**
hendrikvincent 0:05ccbd4f84f1 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
hendrikvincent 0:05ccbd4f84f1 269 *
hendrikvincent 0:05ccbd4f84f1 270 * @param addr ip address in network order to convert
hendrikvincent 0:05ccbd4f84f1 271 * @param buf target buffer where the string is stored
hendrikvincent 0:05ccbd4f84f1 272 * @param buflen length of buf
hendrikvincent 0:05ccbd4f84f1 273 * @return either pointer to buf which now holds the ASCII
hendrikvincent 0:05ccbd4f84f1 274 * representation of addr or NULL if buf was too small
hendrikvincent 0:05ccbd4f84f1 275 */
hendrikvincent 0:05ccbd4f84f1 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
hendrikvincent 0:05ccbd4f84f1 277 {
hendrikvincent 0:05ccbd4f84f1 278 u32_t s_addr;
hendrikvincent 0:05ccbd4f84f1 279 char inv[3];
hendrikvincent 0:05ccbd4f84f1 280 char *rp;
hendrikvincent 0:05ccbd4f84f1 281 u8_t *ap;
hendrikvincent 0:05ccbd4f84f1 282 u8_t rem;
hendrikvincent 0:05ccbd4f84f1 283 u8_t n;
hendrikvincent 0:05ccbd4f84f1 284 u8_t i;
hendrikvincent 0:05ccbd4f84f1 285 int len = 0;
hendrikvincent 0:05ccbd4f84f1 286
hendrikvincent 0:05ccbd4f84f1 287 s_addr = ip4_addr_get_u32(addr);
hendrikvincent 0:05ccbd4f84f1 288
hendrikvincent 0:05ccbd4f84f1 289 rp = buf;
hendrikvincent 0:05ccbd4f84f1 290 ap = (u8_t *)&s_addr;
hendrikvincent 0:05ccbd4f84f1 291 for(n = 0; n < 4; n++) {
hendrikvincent 0:05ccbd4f84f1 292 i = 0;
hendrikvincent 0:05ccbd4f84f1 293 do {
hendrikvincent 0:05ccbd4f84f1 294 rem = *ap % (u8_t)10;
hendrikvincent 0:05ccbd4f84f1 295 *ap /= (u8_t)10;
hendrikvincent 0:05ccbd4f84f1 296 inv[i++] = '0' + rem;
hendrikvincent 0:05ccbd4f84f1 297 } while(*ap);
hendrikvincent 0:05ccbd4f84f1 298 while(i--) {
hendrikvincent 0:05ccbd4f84f1 299 if (len++ >= buflen) {
hendrikvincent 0:05ccbd4f84f1 300 return NULL;
hendrikvincent 0:05ccbd4f84f1 301 }
hendrikvincent 0:05ccbd4f84f1 302 *rp++ = inv[i];
hendrikvincent 0:05ccbd4f84f1 303 }
hendrikvincent 0:05ccbd4f84f1 304 if (len++ >= buflen) {
hendrikvincent 0:05ccbd4f84f1 305 return NULL;
hendrikvincent 0:05ccbd4f84f1 306 }
hendrikvincent 0:05ccbd4f84f1 307 *rp++ = '.';
hendrikvincent 0:05ccbd4f84f1 308 ap++;
hendrikvincent 0:05ccbd4f84f1 309 }
hendrikvincent 0:05ccbd4f84f1 310 *--rp = 0;
hendrikvincent 0:05ccbd4f84f1 311 return buf;
hendrikvincent 0:05ccbd4f84f1 312 }