CK Sin / Mbed 2 deprecated Ethernetwebsocket

Ethernetwebsoc

Dependencies:   C12832_lcd LM75B WebSocketClient mbed-rtos mbed Socket lwip-eth lwip-sys lwip

EthernetInterface/lwip/core/ipv4/ip_addr.c@0:0ed2a7c7190c, 2013-05-31 (annotated)

Committer:
GordonSin
Date:
Fri May 31 04:09:54 2013 +0000
Revision:
0:0ed2a7c7190c
31/5/2013;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
GordonSin 0:0ed2a7c7190c 1 /**
GordonSin 0:0ed2a7c7190c 2 * @file
GordonSin 0:0ed2a7c7190c 3 * This is the IPv4 address tools implementation.
GordonSin 0:0ed2a7c7190c 4 *
GordonSin 0:0ed2a7c7190c 5 */
GordonSin 0:0ed2a7c7190c 6
GordonSin 0:0ed2a7c7190c 7 /*
GordonSin 0:0ed2a7c7190c 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
GordonSin 0:0ed2a7c7190c 9 * All rights reserved.
GordonSin 0:0ed2a7c7190c 10 *
GordonSin 0:0ed2a7c7190c 11 * Redistribution and use in source and binary forms, with or without modification,
GordonSin 0:0ed2a7c7190c 12 * are permitted provided that the following conditions are met:
GordonSin 0:0ed2a7c7190c 13 *
GordonSin 0:0ed2a7c7190c 14 * 1. Redistributions of source code must retain the above copyright notice,
GordonSin 0:0ed2a7c7190c 15 * this list of conditions and the following disclaimer.
GordonSin 0:0ed2a7c7190c 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
GordonSin 0:0ed2a7c7190c 17 * this list of conditions and the following disclaimer in the documentation
GordonSin 0:0ed2a7c7190c 18 * and/or other materials provided with the distribution.
GordonSin 0:0ed2a7c7190c 19 * 3. The name of the author may not be used to endorse or promote products
GordonSin 0:0ed2a7c7190c 20 * derived from this software without specific prior written permission.
GordonSin 0:0ed2a7c7190c 21 *
GordonSin 0:0ed2a7c7190c 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
GordonSin 0:0ed2a7c7190c 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
GordonSin 0:0ed2a7c7190c 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
GordonSin 0:0ed2a7c7190c 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
GordonSin 0:0ed2a7c7190c 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
GordonSin 0:0ed2a7c7190c 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
GordonSin 0:0ed2a7c7190c 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
GordonSin 0:0ed2a7c7190c 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
GordonSin 0:0ed2a7c7190c 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
GordonSin 0:0ed2a7c7190c 31 * OF SUCH DAMAGE.
GordonSin 0:0ed2a7c7190c 32 *
GordonSin 0:0ed2a7c7190c 33 * This file is part of the lwIP TCP/IP stack.
GordonSin 0:0ed2a7c7190c 34 *
GordonSin 0:0ed2a7c7190c 35 * Author: Adam Dunkels <adam@sics.se>
GordonSin 0:0ed2a7c7190c 36 *
GordonSin 0:0ed2a7c7190c 37 */
GordonSin 0:0ed2a7c7190c 38
GordonSin 0:0ed2a7c7190c 39 #include "lwip/opt.h"
GordonSin 0:0ed2a7c7190c 40 #include "lwip/ip_addr.h"
GordonSin 0:0ed2a7c7190c 41 #include "lwip/netif.h"
GordonSin 0:0ed2a7c7190c 42
GordonSin 0:0ed2a7c7190c 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
GordonSin 0:0ed2a7c7190c 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
GordonSin 0:0ed2a7c7190c 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
GordonSin 0:0ed2a7c7190c 46
GordonSin 0:0ed2a7c7190c 47 /**
GordonSin 0:0ed2a7c7190c 48 * Determine if an address is a broadcast address on a network interface
GordonSin 0:0ed2a7c7190c 49 *
GordonSin 0:0ed2a7c7190c 50 * @param addr address to be checked
GordonSin 0:0ed2a7c7190c 51 * @param netif the network interface against which the address is checked
GordonSin 0:0ed2a7c7190c 52 * @return returns non-zero if the address is a broadcast address
GordonSin 0:0ed2a7c7190c 53 */
GordonSin 0:0ed2a7c7190c 54 u8_t
GordonSin 0:0ed2a7c7190c 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
GordonSin 0:0ed2a7c7190c 56 {
GordonSin 0:0ed2a7c7190c 57 ip_addr_t ipaddr;
GordonSin 0:0ed2a7c7190c 58 ip4_addr_set_u32(&ipaddr, addr);
GordonSin 0:0ed2a7c7190c 59
GordonSin 0:0ed2a7c7190c 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
GordonSin 0:0ed2a7c7190c 61 if ((~addr == IPADDR_ANY) ||
GordonSin 0:0ed2a7c7190c 62 (addr == IPADDR_ANY)) {
GordonSin 0:0ed2a7c7190c 63 return 1;
GordonSin 0:0ed2a7c7190c 64 /* no broadcast support on this network interface? */
GordonSin 0:0ed2a7c7190c 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
GordonSin 0:0ed2a7c7190c 66 /* the given address cannot be a broadcast address
GordonSin 0:0ed2a7c7190c 67 * nor can we check against any broadcast addresses */
GordonSin 0:0ed2a7c7190c 68 return 0;
GordonSin 0:0ed2a7c7190c 69 /* address matches network interface address exactly? => no broadcast */
GordonSin 0:0ed2a7c7190c 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
GordonSin 0:0ed2a7c7190c 71 return 0;
GordonSin 0:0ed2a7c7190c 72 /* on the same (sub) network... */
GordonSin 0:0ed2a7c7190c 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
GordonSin 0:0ed2a7c7190c 74 /* ...and host identifier bits are all ones? =>... */
GordonSin 0:0ed2a7c7190c 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
GordonSin 0:0ed2a7c7190c 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
GordonSin 0:0ed2a7c7190c 77 /* => network broadcast address */
GordonSin 0:0ed2a7c7190c 78 return 1;
GordonSin 0:0ed2a7c7190c 79 } else {
GordonSin 0:0ed2a7c7190c 80 return 0;
GordonSin 0:0ed2a7c7190c 81 }
GordonSin 0:0ed2a7c7190c 82 }
GordonSin 0:0ed2a7c7190c 83
GordonSin 0:0ed2a7c7190c 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
GordonSin 0:0ed2a7c7190c 85 *
GordonSin 0:0ed2a7c7190c 86 * @param netmask the IPv4 netmask to check (in network byte order!)
GordonSin 0:0ed2a7c7190c 87 * @return 1 if the netmask is valid, 0 if it is not
GordonSin 0:0ed2a7c7190c 88 */
GordonSin 0:0ed2a7c7190c 89 u8_t
GordonSin 0:0ed2a7c7190c 90 ip4_addr_netmask_valid(u32_t netmask)
GordonSin 0:0ed2a7c7190c 91 {
GordonSin 0:0ed2a7c7190c 92 u32_t mask;
GordonSin 0:0ed2a7c7190c 93 u32_t nm_hostorder = lwip_htonl(netmask);
GordonSin 0:0ed2a7c7190c 94
GordonSin 0:0ed2a7c7190c 95 /* first, check for the first zero */
GordonSin 0:0ed2a7c7190c 96 for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
GordonSin 0:0ed2a7c7190c 97 if ((nm_hostorder & mask) == 0) {
GordonSin 0:0ed2a7c7190c 98 break;
GordonSin 0:0ed2a7c7190c 99 }
GordonSin 0:0ed2a7c7190c 100 }
GordonSin 0:0ed2a7c7190c 101 /* then check that there is no one */
GordonSin 0:0ed2a7c7190c 102 for (; mask != 0; mask >>= 1) {
GordonSin 0:0ed2a7c7190c 103 if ((nm_hostorder & mask) != 0) {
GordonSin 0:0ed2a7c7190c 104 /* there is a one after the first zero -> invalid */
GordonSin 0:0ed2a7c7190c 105 return 0;
GordonSin 0:0ed2a7c7190c 106 }
GordonSin 0:0ed2a7c7190c 107 }
GordonSin 0:0ed2a7c7190c 108 /* no one after the first zero -> valid */
GordonSin 0:0ed2a7c7190c 109 return 1;
GordonSin 0:0ed2a7c7190c 110 }
GordonSin 0:0ed2a7c7190c 111
GordonSin 0:0ed2a7c7190c 112 /* Here for now until needed in other places in lwIP */
GordonSin 0:0ed2a7c7190c 113 #ifndef isprint
GordonSin 0:0ed2a7c7190c 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
GordonSin 0:0ed2a7c7190c 115 #define isprint(c) in_range(c, 0x20, 0x7f)
GordonSin 0:0ed2a7c7190c 116 #define isdigit(c) in_range(c, '0', '9')
GordonSin 0:0ed2a7c7190c 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
GordonSin 0:0ed2a7c7190c 118 #define islower(c) in_range(c, 'a', 'z')
GordonSin 0:0ed2a7c7190c 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
GordonSin 0:0ed2a7c7190c 120 #endif
GordonSin 0:0ed2a7c7190c 121
GordonSin 0:0ed2a7c7190c 122 /**
GordonSin 0:0ed2a7c7190c 123 * Ascii internet address interpretation routine.
GordonSin 0:0ed2a7c7190c 124 * The value returned is in network order.
GordonSin 0:0ed2a7c7190c 125 *
GordonSin 0:0ed2a7c7190c 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
GordonSin 0:0ed2a7c7190c 127 * @return ip address in network order
GordonSin 0:0ed2a7c7190c 128 */
GordonSin 0:0ed2a7c7190c 129 u32_t
GordonSin 0:0ed2a7c7190c 130 ipaddr_addr(const char *cp)
GordonSin 0:0ed2a7c7190c 131 {
GordonSin 0:0ed2a7c7190c 132 ip_addr_t val;
GordonSin 0:0ed2a7c7190c 133
GordonSin 0:0ed2a7c7190c 134 if (ipaddr_aton(cp, &val)) {
GordonSin 0:0ed2a7c7190c 135 return ip4_addr_get_u32(&val);
GordonSin 0:0ed2a7c7190c 136 }
GordonSin 0:0ed2a7c7190c 137 return (IPADDR_NONE);
GordonSin 0:0ed2a7c7190c 138 }
GordonSin 0:0ed2a7c7190c 139
GordonSin 0:0ed2a7c7190c 140 /**
GordonSin 0:0ed2a7c7190c 141 * Check whether "cp" is a valid ascii representation
GordonSin 0:0ed2a7c7190c 142 * of an Internet address and convert to a binary address.
GordonSin 0:0ed2a7c7190c 143 * Returns 1 if the address is valid, 0 if not.
GordonSin 0:0ed2a7c7190c 144 * This replaces inet_addr, the return value from which
GordonSin 0:0ed2a7c7190c 145 * cannot distinguish between failure and a local broadcast address.
GordonSin 0:0ed2a7c7190c 146 *
GordonSin 0:0ed2a7c7190c 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
GordonSin 0:0ed2a7c7190c 148 * @param addr pointer to which to save the ip address in network order
GordonSin 0:0ed2a7c7190c 149 * @return 1 if cp could be converted to addr, 0 on failure
GordonSin 0:0ed2a7c7190c 150 */
GordonSin 0:0ed2a7c7190c 151 int
GordonSin 0:0ed2a7c7190c 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
GordonSin 0:0ed2a7c7190c 153 {
GordonSin 0:0ed2a7c7190c 154 u32_t val;
GordonSin 0:0ed2a7c7190c 155 u8_t base;
GordonSin 0:0ed2a7c7190c 156 char c;
GordonSin 0:0ed2a7c7190c 157 u32_t parts[4];
GordonSin 0:0ed2a7c7190c 158 u32_t *pp = parts;
GordonSin 0:0ed2a7c7190c 159
GordonSin 0:0ed2a7c7190c 160 c = *cp;
GordonSin 0:0ed2a7c7190c 161 for (;;) {
GordonSin 0:0ed2a7c7190c 162 /*
GordonSin 0:0ed2a7c7190c 163 * Collect number up to ``.''.
GordonSin 0:0ed2a7c7190c 164 * Values are specified as for C:
GordonSin 0:0ed2a7c7190c 165 * 0x=hex, 0=octal, 1-9=decimal.
GordonSin 0:0ed2a7c7190c 166 */
GordonSin 0:0ed2a7c7190c 167 if (!isdigit(c))
GordonSin 0:0ed2a7c7190c 168 return (0);
GordonSin 0:0ed2a7c7190c 169 val = 0;
GordonSin 0:0ed2a7c7190c 170 base = 10;
GordonSin 0:0ed2a7c7190c 171 if (c == '0') {
GordonSin 0:0ed2a7c7190c 172 c = *++cp;
GordonSin 0:0ed2a7c7190c 173 if (c == 'x' || c == 'X') {
GordonSin 0:0ed2a7c7190c 174 base = 16;
GordonSin 0:0ed2a7c7190c 175 c = *++cp;
GordonSin 0:0ed2a7c7190c 176 } else
GordonSin 0:0ed2a7c7190c 177 base = 8;
GordonSin 0:0ed2a7c7190c 178 }
GordonSin 0:0ed2a7c7190c 179 for (;;) {
GordonSin 0:0ed2a7c7190c 180 if (isdigit(c)) {
GordonSin 0:0ed2a7c7190c 181 val = (val * base) + (int)(c - '0');
GordonSin 0:0ed2a7c7190c 182 c = *++cp;
GordonSin 0:0ed2a7c7190c 183 } else if (base == 16 && isxdigit(c)) {
GordonSin 0:0ed2a7c7190c 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
GordonSin 0:0ed2a7c7190c 185 c = *++cp;
GordonSin 0:0ed2a7c7190c 186 } else
GordonSin 0:0ed2a7c7190c 187 break;
GordonSin 0:0ed2a7c7190c 188 }
GordonSin 0:0ed2a7c7190c 189 if (c == '.') {
GordonSin 0:0ed2a7c7190c 190 /*
GordonSin 0:0ed2a7c7190c 191 * Internet format:
GordonSin 0:0ed2a7c7190c 192 * a.b.c.d
GordonSin 0:0ed2a7c7190c 193 * a.b.c (with c treated as 16 bits)
GordonSin 0:0ed2a7c7190c 194 * a.b (with b treated as 24 bits)
GordonSin 0:0ed2a7c7190c 195 */
GordonSin 0:0ed2a7c7190c 196 if (pp >= parts + 3) {
GordonSin 0:0ed2a7c7190c 197 return (0);
GordonSin 0:0ed2a7c7190c 198 }
GordonSin 0:0ed2a7c7190c 199 *pp++ = val;
GordonSin 0:0ed2a7c7190c 200 c = *++cp;
GordonSin 0:0ed2a7c7190c 201 } else
GordonSin 0:0ed2a7c7190c 202 break;
GordonSin 0:0ed2a7c7190c 203 }
GordonSin 0:0ed2a7c7190c 204 /*
GordonSin 0:0ed2a7c7190c 205 * Check for trailing characters.
GordonSin 0:0ed2a7c7190c 206 */
GordonSin 0:0ed2a7c7190c 207 if (c != '\0' && !isspace(c)) {
GordonSin 0:0ed2a7c7190c 208 return (0);
GordonSin 0:0ed2a7c7190c 209 }
GordonSin 0:0ed2a7c7190c 210 /*
GordonSin 0:0ed2a7c7190c 211 * Concoct the address according to
GordonSin 0:0ed2a7c7190c 212 * the number of parts specified.
GordonSin 0:0ed2a7c7190c 213 */
GordonSin 0:0ed2a7c7190c 214 switch (pp - parts + 1) {
GordonSin 0:0ed2a7c7190c 215
GordonSin 0:0ed2a7c7190c 216 case 0:
GordonSin 0:0ed2a7c7190c 217 return (0); /* initial nondigit */
GordonSin 0:0ed2a7c7190c 218
GordonSin 0:0ed2a7c7190c 219 case 1: /* a -- 32 bits */
GordonSin 0:0ed2a7c7190c 220 break;
GordonSin 0:0ed2a7c7190c 221
GordonSin 0:0ed2a7c7190c 222 case 2: /* a.b -- 8.24 bits */
GordonSin 0:0ed2a7c7190c 223 if (val > 0xffffffUL) {
GordonSin 0:0ed2a7c7190c 224 return (0);
GordonSin 0:0ed2a7c7190c 225 }
GordonSin 0:0ed2a7c7190c 226 val |= parts[0] << 24;
GordonSin 0:0ed2a7c7190c 227 break;
GordonSin 0:0ed2a7c7190c 228
GordonSin 0:0ed2a7c7190c 229 case 3: /* a.b.c -- 8.8.16 bits */
GordonSin 0:0ed2a7c7190c 230 if (val > 0xffff) {
GordonSin 0:0ed2a7c7190c 231 return (0);
GordonSin 0:0ed2a7c7190c 232 }
GordonSin 0:0ed2a7c7190c 233 val |= (parts[0] << 24) | (parts[1] << 16);
GordonSin 0:0ed2a7c7190c 234 break;
GordonSin 0:0ed2a7c7190c 235
GordonSin 0:0ed2a7c7190c 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
GordonSin 0:0ed2a7c7190c 237 if (val > 0xff) {
GordonSin 0:0ed2a7c7190c 238 return (0);
GordonSin 0:0ed2a7c7190c 239 }
GordonSin 0:0ed2a7c7190c 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
GordonSin 0:0ed2a7c7190c 241 break;
GordonSin 0:0ed2a7c7190c 242 default:
GordonSin 0:0ed2a7c7190c 243 LWIP_ASSERT("unhandled", 0);
GordonSin 0:0ed2a7c7190c 244 break;
GordonSin 0:0ed2a7c7190c 245 }
GordonSin 0:0ed2a7c7190c 246 if (addr) {
GordonSin 0:0ed2a7c7190c 247 ip4_addr_set_u32(addr, htonl(val));
GordonSin 0:0ed2a7c7190c 248 }
GordonSin 0:0ed2a7c7190c 249 return (1);
GordonSin 0:0ed2a7c7190c 250 }
GordonSin 0:0ed2a7c7190c 251
GordonSin 0:0ed2a7c7190c 252 /**
GordonSin 0:0ed2a7c7190c 253 * Convert numeric IP address into decimal dotted ASCII representation.
GordonSin 0:0ed2a7c7190c 254 * returns ptr to static buffer; not reentrant!
GordonSin 0:0ed2a7c7190c 255 *
GordonSin 0:0ed2a7c7190c 256 * @param addr ip address in network order to convert
GordonSin 0:0ed2a7c7190c 257 * @return pointer to a global static (!) buffer that holds the ASCII
GordonSin 0:0ed2a7c7190c 258 * represenation of addr
GordonSin 0:0ed2a7c7190c 259 */
GordonSin 0:0ed2a7c7190c 260 char *
GordonSin 0:0ed2a7c7190c 261 ipaddr_ntoa(const ip_addr_t *addr)
GordonSin 0:0ed2a7c7190c 262 {
GordonSin 0:0ed2a7c7190c 263 static char str[16];
GordonSin 0:0ed2a7c7190c 264 return ipaddr_ntoa_r(addr, str, 16);
GordonSin 0:0ed2a7c7190c 265 }
GordonSin 0:0ed2a7c7190c 266
GordonSin 0:0ed2a7c7190c 267 /**
GordonSin 0:0ed2a7c7190c 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
GordonSin 0:0ed2a7c7190c 269 *
GordonSin 0:0ed2a7c7190c 270 * @param addr ip address in network order to convert
GordonSin 0:0ed2a7c7190c 271 * @param buf target buffer where the string is stored
GordonSin 0:0ed2a7c7190c 272 * @param buflen length of buf
GordonSin 0:0ed2a7c7190c 273 * @return either pointer to buf which now holds the ASCII
GordonSin 0:0ed2a7c7190c 274 * representation of addr or NULL if buf was too small
GordonSin 0:0ed2a7c7190c 275 */
GordonSin 0:0ed2a7c7190c 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
GordonSin 0:0ed2a7c7190c 277 {
GordonSin 0:0ed2a7c7190c 278 u32_t s_addr;
GordonSin 0:0ed2a7c7190c 279 char inv[3];
GordonSin 0:0ed2a7c7190c 280 char *rp;
GordonSin 0:0ed2a7c7190c 281 u8_t *ap;
GordonSin 0:0ed2a7c7190c 282 u8_t rem;
GordonSin 0:0ed2a7c7190c 283 u8_t n;
GordonSin 0:0ed2a7c7190c 284 u8_t i;
GordonSin 0:0ed2a7c7190c 285 int len = 0;
GordonSin 0:0ed2a7c7190c 286
GordonSin 0:0ed2a7c7190c 287 s_addr = ip4_addr_get_u32(addr);
GordonSin 0:0ed2a7c7190c 288
GordonSin 0:0ed2a7c7190c 289 rp = buf;
GordonSin 0:0ed2a7c7190c 290 ap = (u8_t *)&s_addr;
GordonSin 0:0ed2a7c7190c 291 for(n = 0; n < 4; n++) {
GordonSin 0:0ed2a7c7190c 292 i = 0;
GordonSin 0:0ed2a7c7190c 293 do {
GordonSin 0:0ed2a7c7190c 294 rem = *ap % (u8_t)10;
GordonSin 0:0ed2a7c7190c 295 *ap /= (u8_t)10;
GordonSin 0:0ed2a7c7190c 296 inv[i++] = '0' + rem;
GordonSin 0:0ed2a7c7190c 297 } while(*ap);
GordonSin 0:0ed2a7c7190c 298 while(i--) {
GordonSin 0:0ed2a7c7190c 299 if (len++ >= buflen) {
GordonSin 0:0ed2a7c7190c 300 return NULL;
GordonSin 0:0ed2a7c7190c 301 }
GordonSin 0:0ed2a7c7190c 302 *rp++ = inv[i];
GordonSin 0:0ed2a7c7190c 303 }
GordonSin 0:0ed2a7c7190c 304 if (len++ >= buflen) {
GordonSin 0:0ed2a7c7190c 305 return NULL;
GordonSin 0:0ed2a7c7190c 306 }
GordonSin 0:0ed2a7c7190c 307 *rp++ = '.';
GordonSin 0:0ed2a7c7190c 308 ap++;
GordonSin 0:0ed2a7c7190c 309 }
GordonSin 0:0ed2a7c7190c 310 *--rp = 0;
GordonSin 0:0ed2a7c7190c 311 return buf;
GordonSin 0:0ed2a7c7190c 312 }