108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
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/*
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* Copyright (c) 1996 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/* Author: Paul Vixie (ISC), July 1996 */
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/* Copied from Linux, modified for Phoenix-RTOS. */
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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static char *inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
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{
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char *odst = dst;
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char *t;
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u_int m;
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int b;
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if (bits < 0 || bits > 32) {
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errno = EINVAL;
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return (NULL);
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}
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if (bits == 0) {
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if (size < sizeof "0")
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goto emsgsize;
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*dst++ = '0';
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*dst = '\0';
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}
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/* Format whole octets. */
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for (b = bits / 8; b > 0; b--) {
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if (size < sizeof "255.")
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goto emsgsize;
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t = dst;
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dst += SPRINTF((dst, "%u", *src++));
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if (b > 1) {
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*dst++ = '.';
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*dst = '\0';
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}
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size -= (size_t)(dst - t);
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}
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/* Format partial octet. */
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b = bits % 8;
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if (b > 0) {
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if (size < sizeof ".255")
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goto emsgsize;
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t = dst;
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if (dst != odst)
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*dst++ = '.';
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m = ((1 << b) - 1) << (8 - b);
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dst += SPRINTF((dst, "%u", *src & m));
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size -= (size_t)(dst - t);
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}
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/* Format CIDR /width. */
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if (size < sizeof "/32")
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goto emsgsize;
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dst += SPRINTF((dst, "/%u", bits));
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return (odst);
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emsgsize:
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errno = EMSGSIZE;
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return (NULL);
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}
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char *inet_net_ntop(int af, const void *netp, int bits, char *pres, size_t psize)
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{
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switch (af) {
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case AF_INET:
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return inet_net_ntop_ipv4(netp, bits, pres, psize);
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default:
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errno = EAFNOSUPPORT;
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return NULL;
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}
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}
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