Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/ipv4/ip_addr.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 /**
ninoderkinderen 0:8d87bc453349 2 * @file
ninoderkinderen 0:8d87bc453349 3 * This is the IPv4 address tools implementation.
ninoderkinderen 0:8d87bc453349 4 *
ninoderkinderen 0:8d87bc453349 5 */
ninoderkinderen 0:8d87bc453349 6
ninoderkinderen 0:8d87bc453349 7 /*
ninoderkinderen 0:8d87bc453349 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ninoderkinderen 0:8d87bc453349 9 * All rights reserved.
ninoderkinderen 0:8d87bc453349 10 *
ninoderkinderen 0:8d87bc453349 11 * Redistribution and use in source and binary forms, with or without modification,
ninoderkinderen 0:8d87bc453349 12 * are permitted provided that the following conditions are met:
ninoderkinderen 0:8d87bc453349 13 *
ninoderkinderen 0:8d87bc453349 14 * 1. Redistributions of source code must retain the above copyright notice,
ninoderkinderen 0:8d87bc453349 15 * this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
ninoderkinderen 0:8d87bc453349 17 * this list of conditions and the following disclaimer in the documentation
ninoderkinderen 0:8d87bc453349 18 * and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 19 * 3. The name of the author may not be used to endorse or promote products
ninoderkinderen 0:8d87bc453349 20 * derived from this software without specific prior written permission.
ninoderkinderen 0:8d87bc453349 21 *
ninoderkinderen 0:8d87bc453349 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
ninoderkinderen 0:8d87bc453349 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
ninoderkinderen 0:8d87bc453349 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
ninoderkinderen 0:8d87bc453349 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ninoderkinderen 0:8d87bc453349 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
ninoderkinderen 0:8d87bc453349 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ninoderkinderen 0:8d87bc453349 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ninoderkinderen 0:8d87bc453349 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
ninoderkinderen 0:8d87bc453349 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
ninoderkinderen 0:8d87bc453349 31 * OF SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 32 *
ninoderkinderen 0:8d87bc453349 33 * This file is part of the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 34 *
ninoderkinderen 0:8d87bc453349 35 * Author: Adam Dunkels <adam@sics.se>
ninoderkinderen 0:8d87bc453349 36 *
ninoderkinderen 0:8d87bc453349 37 */
ninoderkinderen 0:8d87bc453349 38
ninoderkinderen 0:8d87bc453349 39 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 40 #include "lwip/ip_addr.h"
ninoderkinderen 0:8d87bc453349 41 #include "lwip/netif.h"
ninoderkinderen 0:8d87bc453349 42
ninoderkinderen 0:8d87bc453349 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
ninoderkinderen 0:8d87bc453349 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
ninoderkinderen 0:8d87bc453349 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
ninoderkinderen 0:8d87bc453349 46
ninoderkinderen 0:8d87bc453349 47 /**
ninoderkinderen 0:8d87bc453349 48 * Determine if an address is a broadcast address on a network interface
ninoderkinderen 0:8d87bc453349 49 *
ninoderkinderen 0:8d87bc453349 50 * @param addr address to be checked
ninoderkinderen 0:8d87bc453349 51 * @param netif the network interface against which the address is checked
ninoderkinderen 0:8d87bc453349 52 * @return returns non-zero if the address is a broadcast address
ninoderkinderen 0:8d87bc453349 53 */
ninoderkinderen 0:8d87bc453349 54 u8_t
ninoderkinderen 0:8d87bc453349 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
ninoderkinderen 0:8d87bc453349 56 {
ninoderkinderen 0:8d87bc453349 57 ip_addr_t ipaddr;
ninoderkinderen 0:8d87bc453349 58 ip4_addr_set_u32(&ipaddr, addr);
ninoderkinderen 0:8d87bc453349 59
ninoderkinderen 0:8d87bc453349 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
ninoderkinderen 0:8d87bc453349 61 if ((~addr == IPADDR_ANY) ||
ninoderkinderen 0:8d87bc453349 62 (addr == IPADDR_ANY)) {
ninoderkinderen 0:8d87bc453349 63 return 1;
ninoderkinderen 0:8d87bc453349 64 /* no broadcast support on this network interface? */
ninoderkinderen 0:8d87bc453349 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
ninoderkinderen 0:8d87bc453349 66 /* the given address cannot be a broadcast address
ninoderkinderen 0:8d87bc453349 67 * nor can we check against any broadcast addresses */
ninoderkinderen 0:8d87bc453349 68 return 0;
ninoderkinderen 0:8d87bc453349 69 /* address matches network interface address exactly? => no broadcast */
ninoderkinderen 0:8d87bc453349 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
ninoderkinderen 0:8d87bc453349 71 return 0;
ninoderkinderen 0:8d87bc453349 72 /* on the same (sub) network... */
ninoderkinderen 0:8d87bc453349 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
ninoderkinderen 0:8d87bc453349 74 /* ...and host identifier bits are all ones? =>... */
ninoderkinderen 0:8d87bc453349 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
ninoderkinderen 0:8d87bc453349 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
ninoderkinderen 0:8d87bc453349 77 /* => network broadcast address */
ninoderkinderen 0:8d87bc453349 78 return 1;
ninoderkinderen 0:8d87bc453349 79 } else {
ninoderkinderen 0:8d87bc453349 80 return 0;
ninoderkinderen 0:8d87bc453349 81 }
ninoderkinderen 0:8d87bc453349 82 }
ninoderkinderen 0:8d87bc453349 83
ninoderkinderen 0:8d87bc453349 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
ninoderkinderen 0:8d87bc453349 85 *
ninoderkinderen 0:8d87bc453349 86 * @param netmask the IPv4 netmask to check (in network byte order!)
ninoderkinderen 0:8d87bc453349 87 * @return 1 if the netmask is valid, 0 if it is not
ninoderkinderen 0:8d87bc453349 88 */
ninoderkinderen 0:8d87bc453349 89 u8_t
ninoderkinderen 0:8d87bc453349 90 ip4_addr_netmask_valid(u32_t netmask)
ninoderkinderen 0:8d87bc453349 91 {
ninoderkinderen 0:8d87bc453349 92 u32_t mask;
ninoderkinderen 0:8d87bc453349 93 u32_t nm_hostorder = lwip_htonl(netmask);
ninoderkinderen 0:8d87bc453349 94
ninoderkinderen 0:8d87bc453349 95 /* first, check for the first zero */
ninoderkinderen 0:8d87bc453349 96 for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
ninoderkinderen 0:8d87bc453349 97 if ((nm_hostorder & mask) == 0) {
ninoderkinderen 0:8d87bc453349 98 break;
ninoderkinderen 0:8d87bc453349 99 }
ninoderkinderen 0:8d87bc453349 100 }
ninoderkinderen 0:8d87bc453349 101 /* then check that there is no one */
ninoderkinderen 0:8d87bc453349 102 for (; mask != 0; mask >>= 1) {
ninoderkinderen 0:8d87bc453349 103 if ((nm_hostorder & mask) != 0) {
ninoderkinderen 0:8d87bc453349 104 /* there is a one after the first zero -> invalid */
ninoderkinderen 0:8d87bc453349 105 return 0;
ninoderkinderen 0:8d87bc453349 106 }
ninoderkinderen 0:8d87bc453349 107 }
ninoderkinderen 0:8d87bc453349 108 /* no one after the first zero -> valid */
ninoderkinderen 0:8d87bc453349 109 return 1;
ninoderkinderen 0:8d87bc453349 110 }
ninoderkinderen 0:8d87bc453349 111
ninoderkinderen 0:8d87bc453349 112 /* Here for now until needed in other places in lwIP */
ninoderkinderen 0:8d87bc453349 113 #ifndef isprint
ninoderkinderen 0:8d87bc453349 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
ninoderkinderen 0:8d87bc453349 115 #define isprint(c) in_range(c, 0x20, 0x7f)
ninoderkinderen 0:8d87bc453349 116 #define isdigit(c) in_range(c, '0', '9')
ninoderkinderen 0:8d87bc453349 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
ninoderkinderen 0:8d87bc453349 118 #define islower(c) in_range(c, 'a', 'z')
ninoderkinderen 0:8d87bc453349 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
ninoderkinderen 0:8d87bc453349 120 #endif
ninoderkinderen 0:8d87bc453349 121
ninoderkinderen 0:8d87bc453349 122 /**
ninoderkinderen 0:8d87bc453349 123 * Ascii internet address interpretation routine.
ninoderkinderen 0:8d87bc453349 124 * The value returned is in network order.
ninoderkinderen 0:8d87bc453349 125 *
ninoderkinderen 0:8d87bc453349 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
ninoderkinderen 0:8d87bc453349 127 * @return ip address in network order
ninoderkinderen 0:8d87bc453349 128 */
ninoderkinderen 0:8d87bc453349 129 u32_t
ninoderkinderen 0:8d87bc453349 130 ipaddr_addr(const char *cp)
ninoderkinderen 0:8d87bc453349 131 {
ninoderkinderen 0:8d87bc453349 132 ip_addr_t val;
ninoderkinderen 0:8d87bc453349 133
ninoderkinderen 0:8d87bc453349 134 if (ipaddr_aton(cp, &val)) {
ninoderkinderen 0:8d87bc453349 135 return ip4_addr_get_u32(&val);
ninoderkinderen 0:8d87bc453349 136 }
ninoderkinderen 0:8d87bc453349 137 return (IPADDR_NONE);
ninoderkinderen 0:8d87bc453349 138 }
ninoderkinderen 0:8d87bc453349 139
ninoderkinderen 0:8d87bc453349 140 /**
ninoderkinderen 0:8d87bc453349 141 * Check whether "cp" is a valid ascii representation
ninoderkinderen 0:8d87bc453349 142 * of an Internet address and convert to a binary address.
ninoderkinderen 0:8d87bc453349 143 * Returns 1 if the address is valid, 0 if not.
ninoderkinderen 0:8d87bc453349 144 * This replaces inet_addr, the return value from which
ninoderkinderen 0:8d87bc453349 145 * cannot distinguish between failure and a local broadcast address.
ninoderkinderen 0:8d87bc453349 146 *
ninoderkinderen 0:8d87bc453349 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
ninoderkinderen 0:8d87bc453349 148 * @param addr pointer to which to save the ip address in network order
ninoderkinderen 0:8d87bc453349 149 * @return 1 if cp could be converted to addr, 0 on failure
ninoderkinderen 0:8d87bc453349 150 */
ninoderkinderen 0:8d87bc453349 151 int
ninoderkinderen 0:8d87bc453349 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 153 {
ninoderkinderen 0:8d87bc453349 154 u32_t val;
ninoderkinderen 0:8d87bc453349 155 u8_t base;
ninoderkinderen 0:8d87bc453349 156 char c;
ninoderkinderen 0:8d87bc453349 157 u32_t parts[4];
ninoderkinderen 0:8d87bc453349 158 u32_t *pp = parts;
ninoderkinderen 0:8d87bc453349 159
ninoderkinderen 0:8d87bc453349 160 c = *cp;
ninoderkinderen 0:8d87bc453349 161 for (;;) {
ninoderkinderen 0:8d87bc453349 162 /*
ninoderkinderen 0:8d87bc453349 163 * Collect number up to ``.''.
ninoderkinderen 0:8d87bc453349 164 * Values are specified as for C:
ninoderkinderen 0:8d87bc453349 165 * 0x=hex, 0=octal, 1-9=decimal.
ninoderkinderen 0:8d87bc453349 166 */
ninoderkinderen 0:8d87bc453349 167 if (!isdigit(c))
ninoderkinderen 0:8d87bc453349 168 return (0);
ninoderkinderen 0:8d87bc453349 169 val = 0;
ninoderkinderen 0:8d87bc453349 170 base = 10;
ninoderkinderen 0:8d87bc453349 171 if (c == '0') {
ninoderkinderen 0:8d87bc453349 172 c = *++cp;
ninoderkinderen 0:8d87bc453349 173 if (c == 'x' || c == 'X') {
ninoderkinderen 0:8d87bc453349 174 base = 16;
ninoderkinderen 0:8d87bc453349 175 c = *++cp;
ninoderkinderen 0:8d87bc453349 176 } else
ninoderkinderen 0:8d87bc453349 177 base = 8;
ninoderkinderen 0:8d87bc453349 178 }
ninoderkinderen 0:8d87bc453349 179 for (;;) {
ninoderkinderen 0:8d87bc453349 180 if (isdigit(c)) {
ninoderkinderen 0:8d87bc453349 181 val = (val * base) + (int)(c - '0');
ninoderkinderen 0:8d87bc453349 182 c = *++cp;
ninoderkinderen 0:8d87bc453349 183 } else if (base == 16 && isxdigit(c)) {
ninoderkinderen 0:8d87bc453349 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
ninoderkinderen 0:8d87bc453349 185 c = *++cp;
ninoderkinderen 0:8d87bc453349 186 } else
ninoderkinderen 0:8d87bc453349 187 break;
ninoderkinderen 0:8d87bc453349 188 }
ninoderkinderen 0:8d87bc453349 189 if (c == '.') {
ninoderkinderen 0:8d87bc453349 190 /*
ninoderkinderen 0:8d87bc453349 191 * Internet format:
ninoderkinderen 0:8d87bc453349 192 * a.b.c.d
ninoderkinderen 0:8d87bc453349 193 * a.b.c (with c treated as 16 bits)
ninoderkinderen 0:8d87bc453349 194 * a.b (with b treated as 24 bits)
ninoderkinderen 0:8d87bc453349 195 */
ninoderkinderen 0:8d87bc453349 196 if (pp >= parts + 3) {
ninoderkinderen 0:8d87bc453349 197 return (0);
ninoderkinderen 0:8d87bc453349 198 }
ninoderkinderen 0:8d87bc453349 199 *pp++ = val;
ninoderkinderen 0:8d87bc453349 200 c = *++cp;
ninoderkinderen 0:8d87bc453349 201 } else
ninoderkinderen 0:8d87bc453349 202 break;
ninoderkinderen 0:8d87bc453349 203 }
ninoderkinderen 0:8d87bc453349 204 /*
ninoderkinderen 0:8d87bc453349 205 * Check for trailing characters.
ninoderkinderen 0:8d87bc453349 206 */
ninoderkinderen 0:8d87bc453349 207 if (c != '\0' && !isspace(c)) {
ninoderkinderen 0:8d87bc453349 208 return (0);
ninoderkinderen 0:8d87bc453349 209 }
ninoderkinderen 0:8d87bc453349 210 /*
ninoderkinderen 0:8d87bc453349 211 * Concoct the address according to
ninoderkinderen 0:8d87bc453349 212 * the number of parts specified.
ninoderkinderen 0:8d87bc453349 213 */
ninoderkinderen 0:8d87bc453349 214 switch (pp - parts + 1) {
ninoderkinderen 0:8d87bc453349 215
ninoderkinderen 0:8d87bc453349 216 case 0:
ninoderkinderen 0:8d87bc453349 217 return (0); /* initial nondigit */
ninoderkinderen 0:8d87bc453349 218
ninoderkinderen 0:8d87bc453349 219 case 1: /* a -- 32 bits */
ninoderkinderen 0:8d87bc453349 220 break;
ninoderkinderen 0:8d87bc453349 221
ninoderkinderen 0:8d87bc453349 222 case 2: /* a.b -- 8.24 bits */
ninoderkinderen 0:8d87bc453349 223 if (val > 0xffffffUL) {
ninoderkinderen 0:8d87bc453349 224 return (0);
ninoderkinderen 0:8d87bc453349 225 }
ninoderkinderen 0:8d87bc453349 226 val |= parts[0] << 24;
ninoderkinderen 0:8d87bc453349 227 break;
ninoderkinderen 0:8d87bc453349 228
ninoderkinderen 0:8d87bc453349 229 case 3: /* a.b.c -- 8.8.16 bits */
ninoderkinderen 0:8d87bc453349 230 if (val > 0xffff) {
ninoderkinderen 0:8d87bc453349 231 return (0);
ninoderkinderen 0:8d87bc453349 232 }
ninoderkinderen 0:8d87bc453349 233 val |= (parts[0] << 24) | (parts[1] << 16);
ninoderkinderen 0:8d87bc453349 234 break;
ninoderkinderen 0:8d87bc453349 235
ninoderkinderen 0:8d87bc453349 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
ninoderkinderen 0:8d87bc453349 237 if (val > 0xff) {
ninoderkinderen 0:8d87bc453349 238 return (0);
ninoderkinderen 0:8d87bc453349 239 }
ninoderkinderen 0:8d87bc453349 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
ninoderkinderen 0:8d87bc453349 241 break;
ninoderkinderen 0:8d87bc453349 242 default:
ninoderkinderen 0:8d87bc453349 243 LWIP_ASSERT("unhandled", 0);
ninoderkinderen 0:8d87bc453349 244 break;
ninoderkinderen 0:8d87bc453349 245 }
ninoderkinderen 0:8d87bc453349 246 if (addr) {
ninoderkinderen 0:8d87bc453349 247 ip4_addr_set_u32(addr, htonl(val));
ninoderkinderen 0:8d87bc453349 248 }
ninoderkinderen 0:8d87bc453349 249 return (1);
ninoderkinderen 0:8d87bc453349 250 }
ninoderkinderen 0:8d87bc453349 251
ninoderkinderen 0:8d87bc453349 252 /**
ninoderkinderen 0:8d87bc453349 253 * Convert numeric IP address into decimal dotted ASCII representation.
ninoderkinderen 0:8d87bc453349 254 * returns ptr to static buffer; not reentrant!
ninoderkinderen 0:8d87bc453349 255 *
ninoderkinderen 0:8d87bc453349 256 * @param addr ip address in network order to convert
ninoderkinderen 0:8d87bc453349 257 * @return pointer to a global static (!) buffer that holds the ASCII
ninoderkinderen 0:8d87bc453349 258 * represenation of addr
ninoderkinderen 0:8d87bc453349 259 */
ninoderkinderen 0:8d87bc453349 260 char *
ninoderkinderen 0:8d87bc453349 261 ipaddr_ntoa(const ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 262 {
ninoderkinderen 0:8d87bc453349 263 static char str[16];
ninoderkinderen 0:8d87bc453349 264 return ipaddr_ntoa_r(addr, str, 16);
ninoderkinderen 0:8d87bc453349 265 }
ninoderkinderen 0:8d87bc453349 266
ninoderkinderen 0:8d87bc453349 267 /**
ninoderkinderen 0:8d87bc453349 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
ninoderkinderen 0:8d87bc453349 269 *
ninoderkinderen 0:8d87bc453349 270 * @param addr ip address in network order to convert
ninoderkinderen 0:8d87bc453349 271 * @param buf target buffer where the string is stored
ninoderkinderen 0:8d87bc453349 272 * @param buflen length of buf
ninoderkinderen 0:8d87bc453349 273 * @return either pointer to buf which now holds the ASCII
ninoderkinderen 0:8d87bc453349 274 * representation of addr or NULL if buf was too small
ninoderkinderen 0:8d87bc453349 275 */
ninoderkinderen 0:8d87bc453349 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
ninoderkinderen 0:8d87bc453349 277 {
ninoderkinderen 0:8d87bc453349 278 u32_t s_addr;
ninoderkinderen 0:8d87bc453349 279 char inv[3];
ninoderkinderen 0:8d87bc453349 280 char *rp;
ninoderkinderen 0:8d87bc453349 281 u8_t *ap;
ninoderkinderen 0:8d87bc453349 282 u8_t rem;
ninoderkinderen 0:8d87bc453349 283 u8_t n;
ninoderkinderen 0:8d87bc453349 284 u8_t i;
ninoderkinderen 0:8d87bc453349 285 int len = 0;
ninoderkinderen 0:8d87bc453349 286
ninoderkinderen 0:8d87bc453349 287 s_addr = ip4_addr_get_u32(addr);
ninoderkinderen 0:8d87bc453349 288
ninoderkinderen 0:8d87bc453349 289 rp = buf;
ninoderkinderen 0:8d87bc453349 290 ap = (u8_t *)&s_addr;
ninoderkinderen 0:8d87bc453349 291 for(n = 0; n < 4; n++) {
ninoderkinderen 0:8d87bc453349 292 i = 0;
ninoderkinderen 0:8d87bc453349 293 do {
ninoderkinderen 0:8d87bc453349 294 rem = *ap % (u8_t)10;
ninoderkinderen 0:8d87bc453349 295 *ap /= (u8_t)10;
ninoderkinderen 0:8d87bc453349 296 inv[i++] = '0' + rem;
ninoderkinderen 0:8d87bc453349 297 } while(*ap);
ninoderkinderen 0:8d87bc453349 298 while(i--) {
ninoderkinderen 0:8d87bc453349 299 if (len++ >= buflen) {
ninoderkinderen 0:8d87bc453349 300 return NULL;
ninoderkinderen 0:8d87bc453349 301 }
ninoderkinderen 0:8d87bc453349 302 *rp++ = inv[i];
ninoderkinderen 0:8d87bc453349 303 }
ninoderkinderen 0:8d87bc453349 304 if (len++ >= buflen) {
ninoderkinderen 0:8d87bc453349 305 return NULL;
ninoderkinderen 0:8d87bc453349 306 }
ninoderkinderen 0:8d87bc453349 307 *rp++ = '.';
ninoderkinderen 0:8d87bc453349 308 ap++;
ninoderkinderen 0:8d87bc453349 309 }
ninoderkinderen 0:8d87bc453349 310 *--rp = 0;
ninoderkinderen 0:8d87bc453349 311 return buf;
ninoderkinderen 0:8d87bc453349 312 }