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ProjetoBB

Dependencies:   F7_Ethernet WebSocketClient mbed mcp3008

Fork of Nucleo_F746ZG_Ethernet by Dieter Graef

F7_Ethernet/lwip/core/ipv4/ip_addr.c@0:f9b6112278fe, 2016-06-18 (annotated)

Committer:
DieterGraef
Date:
Sat Jun 18 10:49:12 2016 +0000
Revision:
0:f9b6112278fe
Ethernet for the NUCLEO STM32F746 Board Testprogram uses DHCP and NTP to set the clock

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:f9b6112278fe 1 /**
DieterGraef 0:f9b6112278fe 2 * @file
DieterGraef 0:f9b6112278fe 3 * This is the IPv4 address tools implementation.
DieterGraef 0:f9b6112278fe 4 *
DieterGraef 0:f9b6112278fe 5 */
DieterGraef 0:f9b6112278fe 6
DieterGraef 0:f9b6112278fe 7 /*
DieterGraef 0:f9b6112278fe 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
DieterGraef 0:f9b6112278fe 9 * All rights reserved.
DieterGraef 0:f9b6112278fe 10 *
DieterGraef 0:f9b6112278fe 11 * Redistribution and use in source and binary forms, with or without modification,
DieterGraef 0:f9b6112278fe 12 * are permitted provided that the following conditions are met:
DieterGraef 0:f9b6112278fe 13 *
DieterGraef 0:f9b6112278fe 14 * 1. Redistributions of source code must retain the above copyright notice,
DieterGraef 0:f9b6112278fe 15 * this list of conditions and the following disclaimer.
DieterGraef 0:f9b6112278fe 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
DieterGraef 0:f9b6112278fe 17 * this list of conditions and the following disclaimer in the documentation
DieterGraef 0:f9b6112278fe 18 * and/or other materials provided with the distribution.
DieterGraef 0:f9b6112278fe 19 * 3. The name of the author may not be used to endorse or promote products
DieterGraef 0:f9b6112278fe 20 * derived from this software without specific prior written permission.
DieterGraef 0:f9b6112278fe 21 *
DieterGraef 0:f9b6112278fe 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
DieterGraef 0:f9b6112278fe 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
DieterGraef 0:f9b6112278fe 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
DieterGraef 0:f9b6112278fe 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
DieterGraef 0:f9b6112278fe 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
DieterGraef 0:f9b6112278fe 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:f9b6112278fe 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:f9b6112278fe 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
DieterGraef 0:f9b6112278fe 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
DieterGraef 0:f9b6112278fe 31 * OF SUCH DAMAGE.
DieterGraef 0:f9b6112278fe 32 *
DieterGraef 0:f9b6112278fe 33 * This file is part of the lwIP TCP/IP stack.
DieterGraef 0:f9b6112278fe 34 *
DieterGraef 0:f9b6112278fe 35 * Author: Adam Dunkels <adam@sics.se>
DieterGraef 0:f9b6112278fe 36 *
DieterGraef 0:f9b6112278fe 37 */
DieterGraef 0:f9b6112278fe 38
DieterGraef 0:f9b6112278fe 39 #include "lwip/opt.h"
DieterGraef 0:f9b6112278fe 40 #include "lwip/ip_addr.h"
DieterGraef 0:f9b6112278fe 41 #include "lwip/netif.h"
DieterGraef 0:f9b6112278fe 42
DieterGraef 0:f9b6112278fe 43 /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
DieterGraef 0:f9b6112278fe 44 const ip_addr_t ip_addr_any = { IPADDR_ANY };
DieterGraef 0:f9b6112278fe 45 const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
DieterGraef 0:f9b6112278fe 46
DieterGraef 0:f9b6112278fe 47 /**
DieterGraef 0:f9b6112278fe 48 * Determine if an address is a broadcast address on a network interface
DieterGraef 0:f9b6112278fe 49 *
DieterGraef 0:f9b6112278fe 50 * @param addr address to be checked
DieterGraef 0:f9b6112278fe 51 * @param netif the network interface against which the address is checked
DieterGraef 0:f9b6112278fe 52 * @return returns non-zero if the address is a broadcast address
DieterGraef 0:f9b6112278fe 53 */
DieterGraef 0:f9b6112278fe 54 u8_t
DieterGraef 0:f9b6112278fe 55 ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
DieterGraef 0:f9b6112278fe 56 {
DieterGraef 0:f9b6112278fe 57 ip_addr_t ipaddr;
DieterGraef 0:f9b6112278fe 58 ip4_addr_set_u32(&ipaddr, addr);
DieterGraef 0:f9b6112278fe 59
DieterGraef 0:f9b6112278fe 60 /* all ones (broadcast) or all zeroes (old skool broadcast) */
DieterGraef 0:f9b6112278fe 61 if ((~addr == IPADDR_ANY) ||
DieterGraef 0:f9b6112278fe 62 (addr == IPADDR_ANY)) {
DieterGraef 0:f9b6112278fe 63 return 1;
DieterGraef 0:f9b6112278fe 64 /* no broadcast support on this network interface? */
DieterGraef 0:f9b6112278fe 65 } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
DieterGraef 0:f9b6112278fe 66 /* the given address cannot be a broadcast address
DieterGraef 0:f9b6112278fe 67 * nor can we check against any broadcast addresses */
DieterGraef 0:f9b6112278fe 68 return 0;
DieterGraef 0:f9b6112278fe 69 /* address matches network interface address exactly? => no broadcast */
DieterGraef 0:f9b6112278fe 70 } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
DieterGraef 0:f9b6112278fe 71 return 0;
DieterGraef 0:f9b6112278fe 72 /* on the same (sub) network... */
DieterGraef 0:f9b6112278fe 73 } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
DieterGraef 0:f9b6112278fe 74 /* ...and host identifier bits are all ones? =>... */
DieterGraef 0:f9b6112278fe 75 && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
DieterGraef 0:f9b6112278fe 76 (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
DieterGraef 0:f9b6112278fe 77 /* => network broadcast address */
DieterGraef 0:f9b6112278fe 78 return 1;
DieterGraef 0:f9b6112278fe 79 } else {
DieterGraef 0:f9b6112278fe 80 return 0;
DieterGraef 0:f9b6112278fe 81 }
DieterGraef 0:f9b6112278fe 82 }
DieterGraef 0:f9b6112278fe 83
DieterGraef 0:f9b6112278fe 84 /** Checks if a netmask is valid (starting with ones, then only zeros)
DieterGraef 0:f9b6112278fe 85 *
DieterGraef 0:f9b6112278fe 86 * @param netmask the IPv4 netmask to check (in network byte order!)
DieterGraef 0:f9b6112278fe 87 * @return 1 if the netmask is valid, 0 if it is not
DieterGraef 0:f9b6112278fe 88 */
DieterGraef 0:f9b6112278fe 89 u8_t
DieterGraef 0:f9b6112278fe 90 ip4_addr_netmask_valid(u32_t netmask)
DieterGraef 0:f9b6112278fe 91 {
DieterGraef 0:f9b6112278fe 92 u32_t mask;
DieterGraef 0:f9b6112278fe 93 u32_t nm_hostorder = lwip_htonl(netmask);
DieterGraef 0:f9b6112278fe 94
DieterGraef 0:f9b6112278fe 95 /* first, check for the first zero */
DieterGraef 0:f9b6112278fe 96 for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
DieterGraef 0:f9b6112278fe 97 if ((nm_hostorder & mask) == 0) {
DieterGraef 0:f9b6112278fe 98 break;
DieterGraef 0:f9b6112278fe 99 }
DieterGraef 0:f9b6112278fe 100 }
DieterGraef 0:f9b6112278fe 101 /* then check that there is no one */
DieterGraef 0:f9b6112278fe 102 for (; mask != 0; mask >>= 1) {
DieterGraef 0:f9b6112278fe 103 if ((nm_hostorder & mask) != 0) {
DieterGraef 0:f9b6112278fe 104 /* there is a one after the first zero -> invalid */
DieterGraef 0:f9b6112278fe 105 return 0;
DieterGraef 0:f9b6112278fe 106 }
DieterGraef 0:f9b6112278fe 107 }
DieterGraef 0:f9b6112278fe 108 /* no one after the first zero -> valid */
DieterGraef 0:f9b6112278fe 109 return 1;
DieterGraef 0:f9b6112278fe 110 }
DieterGraef 0:f9b6112278fe 111
DieterGraef 0:f9b6112278fe 112 /* Here for now until needed in other places in lwIP */
DieterGraef 0:f9b6112278fe 113 #ifndef isprint
DieterGraef 0:f9b6112278fe 114 #define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
DieterGraef 0:f9b6112278fe 115 #define isprint(c) in_range(c, 0x20, 0x7f)
DieterGraef 0:f9b6112278fe 116 #define isdigit(c) in_range(c, '0', '9')
DieterGraef 0:f9b6112278fe 117 #define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
DieterGraef 0:f9b6112278fe 118 #define islower(c) in_range(c, 'a', 'z')
DieterGraef 0:f9b6112278fe 119 #define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
DieterGraef 0:f9b6112278fe 120 #endif
DieterGraef 0:f9b6112278fe 121
DieterGraef 0:f9b6112278fe 122 /**
DieterGraef 0:f9b6112278fe 123 * Ascii internet address interpretation routine.
DieterGraef 0:f9b6112278fe 124 * The value returned is in network order.
DieterGraef 0:f9b6112278fe 125 *
DieterGraef 0:f9b6112278fe 126 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
DieterGraef 0:f9b6112278fe 127 * @return ip address in network order
DieterGraef 0:f9b6112278fe 128 */
DieterGraef 0:f9b6112278fe 129 u32_t
DieterGraef 0:f9b6112278fe 130 ipaddr_addr(const char *cp)
DieterGraef 0:f9b6112278fe 131 {
DieterGraef 0:f9b6112278fe 132 ip_addr_t val;
DieterGraef 0:f9b6112278fe 133
DieterGraef 0:f9b6112278fe 134 if (ipaddr_aton(cp, &val)) {
DieterGraef 0:f9b6112278fe 135 return ip4_addr_get_u32(&val);
DieterGraef 0:f9b6112278fe 136 }
DieterGraef 0:f9b6112278fe 137 return (IPADDR_NONE);
DieterGraef 0:f9b6112278fe 138 }
DieterGraef 0:f9b6112278fe 139
DieterGraef 0:f9b6112278fe 140 /**
DieterGraef 0:f9b6112278fe 141 * Check whether "cp" is a valid ascii representation
DieterGraef 0:f9b6112278fe 142 * of an Internet address and convert to a binary address.
DieterGraef 0:f9b6112278fe 143 * Returns 1 if the address is valid, 0 if not.
DieterGraef 0:f9b6112278fe 144 * This replaces inet_addr, the return value from which
DieterGraef 0:f9b6112278fe 145 * cannot distinguish between failure and a local broadcast address.
DieterGraef 0:f9b6112278fe 146 *
DieterGraef 0:f9b6112278fe 147 * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
DieterGraef 0:f9b6112278fe 148 * @param addr pointer to which to save the ip address in network order
DieterGraef 0:f9b6112278fe 149 * @return 1 if cp could be converted to addr, 0 on failure
DieterGraef 0:f9b6112278fe 150 */
DieterGraef 0:f9b6112278fe 151 int
DieterGraef 0:f9b6112278fe 152 ipaddr_aton(const char *cp, ip_addr_t *addr)
DieterGraef 0:f9b6112278fe 153 {
DieterGraef 0:f9b6112278fe 154 u32_t val;
DieterGraef 0:f9b6112278fe 155 u8_t base;
DieterGraef 0:f9b6112278fe 156 char c;
DieterGraef 0:f9b6112278fe 157 u32_t parts[4];
DieterGraef 0:f9b6112278fe 158 u32_t *pp = parts;
DieterGraef 0:f9b6112278fe 159
DieterGraef 0:f9b6112278fe 160 c = *cp;
DieterGraef 0:f9b6112278fe 161 for (;;) {
DieterGraef 0:f9b6112278fe 162 /*
DieterGraef 0:f9b6112278fe 163 * Collect number up to ``.''.
DieterGraef 0:f9b6112278fe 164 * Values are specified as for C:
DieterGraef 0:f9b6112278fe 165 * 0x=hex, 0=octal, 1-9=decimal.
DieterGraef 0:f9b6112278fe 166 */
DieterGraef 0:f9b6112278fe 167 if (!isdigit(c))
DieterGraef 0:f9b6112278fe 168 return (0);
DieterGraef 0:f9b6112278fe 169 val = 0;
DieterGraef 0:f9b6112278fe 170 base = 10;
DieterGraef 0:f9b6112278fe 171 if (c == '0') {
DieterGraef 0:f9b6112278fe 172 c = *++cp;
DieterGraef 0:f9b6112278fe 173 if (c == 'x' || c == 'X') {
DieterGraef 0:f9b6112278fe 174 base = 16;
DieterGraef 0:f9b6112278fe 175 c = *++cp;
DieterGraef 0:f9b6112278fe 176 } else
DieterGraef 0:f9b6112278fe 177 base = 8;
DieterGraef 0:f9b6112278fe 178 }
DieterGraef 0:f9b6112278fe 179 for (;;) {
DieterGraef 0:f9b6112278fe 180 if (isdigit(c)) {
DieterGraef 0:f9b6112278fe 181 val = (val * base) + (int)(c - '0');
DieterGraef 0:f9b6112278fe 182 c = *++cp;
DieterGraef 0:f9b6112278fe 183 } else if (base == 16 && isxdigit(c)) {
DieterGraef 0:f9b6112278fe 184 val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
DieterGraef 0:f9b6112278fe 185 c = *++cp;
DieterGraef 0:f9b6112278fe 186 } else
DieterGraef 0:f9b6112278fe 187 break;
DieterGraef 0:f9b6112278fe 188 }
DieterGraef 0:f9b6112278fe 189 if (c == '.') {
DieterGraef 0:f9b6112278fe 190 /*
DieterGraef 0:f9b6112278fe 191 * Internet format:
DieterGraef 0:f9b6112278fe 192 * a.b.c.d
DieterGraef 0:f9b6112278fe 193 * a.b.c (with c treated as 16 bits)
DieterGraef 0:f9b6112278fe 194 * a.b (with b treated as 24 bits)
DieterGraef 0:f9b6112278fe 195 */
DieterGraef 0:f9b6112278fe 196 if (pp >= parts + 3) {
DieterGraef 0:f9b6112278fe 197 return (0);
DieterGraef 0:f9b6112278fe 198 }
DieterGraef 0:f9b6112278fe 199 *pp++ = val;
DieterGraef 0:f9b6112278fe 200 c = *++cp;
DieterGraef 0:f9b6112278fe 201 } else
DieterGraef 0:f9b6112278fe 202 break;
DieterGraef 0:f9b6112278fe 203 }
DieterGraef 0:f9b6112278fe 204 /*
DieterGraef 0:f9b6112278fe 205 * Check for trailing characters.
DieterGraef 0:f9b6112278fe 206 */
DieterGraef 0:f9b6112278fe 207 if (c != '\0' && !isspace(c)) {
DieterGraef 0:f9b6112278fe 208 return (0);
DieterGraef 0:f9b6112278fe 209 }
DieterGraef 0:f9b6112278fe 210 /*
DieterGraef 0:f9b6112278fe 211 * Concoct the address according to
DieterGraef 0:f9b6112278fe 212 * the number of parts specified.
DieterGraef 0:f9b6112278fe 213 */
DieterGraef 0:f9b6112278fe 214 switch (pp - parts + 1) {
DieterGraef 0:f9b6112278fe 215
DieterGraef 0:f9b6112278fe 216 case 0:
DieterGraef 0:f9b6112278fe 217 return (0); /* initial nondigit */
DieterGraef 0:f9b6112278fe 218
DieterGraef 0:f9b6112278fe 219 case 1: /* a -- 32 bits */
DieterGraef 0:f9b6112278fe 220 break;
DieterGraef 0:f9b6112278fe 221
DieterGraef 0:f9b6112278fe 222 case 2: /* a.b -- 8.24 bits */
DieterGraef 0:f9b6112278fe 223 if (val > 0xffffffUL) {
DieterGraef 0:f9b6112278fe 224 return (0);
DieterGraef 0:f9b6112278fe 225 }
DieterGraef 0:f9b6112278fe 226 val |= parts[0] << 24;
DieterGraef 0:f9b6112278fe 227 break;
DieterGraef 0:f9b6112278fe 228
DieterGraef 0:f9b6112278fe 229 case 3: /* a.b.c -- 8.8.16 bits */
DieterGraef 0:f9b6112278fe 230 if (val > 0xffff) {
DieterGraef 0:f9b6112278fe 231 return (0);
DieterGraef 0:f9b6112278fe 232 }
DieterGraef 0:f9b6112278fe 233 val |= (parts[0] << 24) | (parts[1] << 16);
DieterGraef 0:f9b6112278fe 234 break;
DieterGraef 0:f9b6112278fe 235
DieterGraef 0:f9b6112278fe 236 case 4: /* a.b.c.d -- 8.8.8.8 bits */
DieterGraef 0:f9b6112278fe 237 if (val > 0xff) {
DieterGraef 0:f9b6112278fe 238 return (0);
DieterGraef 0:f9b6112278fe 239 }
DieterGraef 0:f9b6112278fe 240 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
DieterGraef 0:f9b6112278fe 241 break;
DieterGraef 0:f9b6112278fe 242 default:
DieterGraef 0:f9b6112278fe 243 LWIP_ASSERT("unhandled", 0);
DieterGraef 0:f9b6112278fe 244 break;
DieterGraef 0:f9b6112278fe 245 }
DieterGraef 0:f9b6112278fe 246 if (addr) {
DieterGraef 0:f9b6112278fe 247 ip4_addr_set_u32(addr, htonl(val));
DieterGraef 0:f9b6112278fe 248 }
DieterGraef 0:f9b6112278fe 249 return (1);
DieterGraef 0:f9b6112278fe 250 }
DieterGraef 0:f9b6112278fe 251
DieterGraef 0:f9b6112278fe 252 /**
DieterGraef 0:f9b6112278fe 253 * Convert numeric IP address into decimal dotted ASCII representation.
DieterGraef 0:f9b6112278fe 254 * returns ptr to static buffer; not reentrant!
DieterGraef 0:f9b6112278fe 255 *
DieterGraef 0:f9b6112278fe 256 * @param addr ip address in network order to convert
DieterGraef 0:f9b6112278fe 257 * @return pointer to a global static (!) buffer that holds the ASCII
DieterGraef 0:f9b6112278fe 258 * represenation of addr
DieterGraef 0:f9b6112278fe 259 */
DieterGraef 0:f9b6112278fe 260 char *
DieterGraef 0:f9b6112278fe 261 ipaddr_ntoa(const ip_addr_t *addr)
DieterGraef 0:f9b6112278fe 262 {
DieterGraef 0:f9b6112278fe 263 static char str[16];
DieterGraef 0:f9b6112278fe 264 return ipaddr_ntoa_r(addr, str, 16);
DieterGraef 0:f9b6112278fe 265 }
DieterGraef 0:f9b6112278fe 266
DieterGraef 0:f9b6112278fe 267 /**
DieterGraef 0:f9b6112278fe 268 * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
DieterGraef 0:f9b6112278fe 269 *
DieterGraef 0:f9b6112278fe 270 * @param addr ip address in network order to convert
DieterGraef 0:f9b6112278fe 271 * @param buf target buffer where the string is stored
DieterGraef 0:f9b6112278fe 272 * @param buflen length of buf
DieterGraef 0:f9b6112278fe 273 * @return either pointer to buf which now holds the ASCII
DieterGraef 0:f9b6112278fe 274 * representation of addr or NULL if buf was too small
DieterGraef 0:f9b6112278fe 275 */
DieterGraef 0:f9b6112278fe 276 char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
DieterGraef 0:f9b6112278fe 277 {
DieterGraef 0:f9b6112278fe 278 u32_t s_addr;
DieterGraef 0:f9b6112278fe 279 char inv[3];
DieterGraef 0:f9b6112278fe 280 char *rp;
DieterGraef 0:f9b6112278fe 281 u8_t *ap;
DieterGraef 0:f9b6112278fe 282 u8_t rem;
DieterGraef 0:f9b6112278fe 283 u8_t n;
DieterGraef 0:f9b6112278fe 284 u8_t i;
DieterGraef 0:f9b6112278fe 285 int len = 0;
DieterGraef 0:f9b6112278fe 286
DieterGraef 0:f9b6112278fe 287 s_addr = ip4_addr_get_u32(addr);
DieterGraef 0:f9b6112278fe 288
DieterGraef 0:f9b6112278fe 289 rp = buf;
DieterGraef 0:f9b6112278fe 290 ap = (u8_t *)&s_addr;
DieterGraef 0:f9b6112278fe 291 for(n = 0; n < 4; n++) {
DieterGraef 0:f9b6112278fe 292 i = 0;
DieterGraef 0:f9b6112278fe 293 do {
DieterGraef 0:f9b6112278fe 294 rem = *ap % (u8_t)10;
DieterGraef 0:f9b6112278fe 295 *ap /= (u8_t)10;
DieterGraef 0:f9b6112278fe 296 inv[i++] = '0' + rem;
DieterGraef 0:f9b6112278fe 297 } while(*ap);
DieterGraef 0:f9b6112278fe 298 while(i--) {
DieterGraef 0:f9b6112278fe 299 if (len++ >= buflen) {
DieterGraef 0:f9b6112278fe 300 return NULL;
DieterGraef 0:f9b6112278fe 301 }
DieterGraef 0:f9b6112278fe 302 *rp++ = inv[i];
DieterGraef 0:f9b6112278fe 303 }
DieterGraef 0:f9b6112278fe 304 if (len++ >= buflen) {
DieterGraef 0:f9b6112278fe 305 return NULL;
DieterGraef 0:f9b6112278fe 306 }
DieterGraef 0:f9b6112278fe 307 *rp++ = '.';
DieterGraef 0:f9b6112278fe 308 ap++;
DieterGraef 0:f9b6112278fe 309 }
DieterGraef 0:f9b6112278fe 310 *--rp = 0;
DieterGraef 0:f9b6112278fe 311 return buf;
DieterGraef 0:f9b6112278fe 312 }