| /* |
| * Copyright (c) 1996,1999 by Internet Software Consortium. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| * SOFTWARE. |
| */ |
| |
| #if defined(LIBC_SCCS) && !defined(lint) |
| static const char rcsid[] = "$BINDId: inet_net_ntop.c,v 1.6 1999/01/08 19:23:42 vixie Exp $"; |
| #endif |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #ifdef SPRINTF_CHAR |
| # define SPRINTF(x) strlen(sprintf/**/x) |
| #else |
| # define SPRINTF(x) ((size_t)sprintf x) |
| #endif |
| |
| static char * inet_net_ntop_ipv4 (const u_char *src, int bits, |
| char *dst, size_t size) __THROW; |
| |
| /* |
| * char * |
| * inet_net_ntop(af, src, bits, dst, size) |
| * convert network number from network to presentation format. |
| * generates CIDR style result always. |
| * return: |
| * pointer to dst, or NULL if an error occurred (check errno). |
| * author: |
| * Paul Vixie (ISC), July 1996 |
| */ |
| char * |
| inet_net_ntop(af, src, bits, dst, size) |
| int af; |
| const void *src; |
| int bits; |
| char *dst; |
| size_t size; |
| { |
| switch (af) { |
| case AF_INET: |
| return (inet_net_ntop_ipv4(src, bits, dst, size)); |
| default: |
| __set_errno (EAFNOSUPPORT); |
| return (NULL); |
| } |
| } |
| |
| /* |
| * static char * |
| * inet_net_ntop_ipv4(src, bits, dst, size) |
| * convert IPv4 network number from network to presentation format. |
| * generates CIDR style result always. |
| * return: |
| * pointer to dst, or NULL if an error occurred (check errno). |
| * note: |
| * network byte order assumed. this means 192.5.5.240/28 has |
| * 0b11110000 in its fourth octet. |
| * author: |
| * Paul Vixie (ISC), July 1996 |
| */ |
| static char * |
| inet_net_ntop_ipv4(src, bits, dst, size) |
| const u_char *src; |
| int bits; |
| char *dst; |
| size_t size; |
| { |
| char *odst = dst; |
| char *t; |
| u_int m; |
| int b; |
| |
| if (bits < 0 || bits > 32) { |
| __set_errno (EINVAL); |
| return (NULL); |
| } |
| if (bits == 0) { |
| if (size < sizeof "0") |
| goto emsgsize; |
| *dst++ = '0'; |
| size--; |
| *dst = '\0'; |
| } |
| |
| /* Format whole octets. */ |
| for (b = bits / 8; b > 0; b--) { |
| if (size < sizeof "255.") |
| goto emsgsize; |
| t = dst; |
| dst += SPRINTF((dst, "%u", *src++)); |
| if (b > 1) { |
| *dst++ = '.'; |
| *dst = '\0'; |
| } |
| size -= (size_t)(dst - t); |
| } |
| |
| /* Format partial octet. */ |
| b = bits % 8; |
| if (b > 0) { |
| if (size < sizeof ".255") |
| goto emsgsize; |
| t = dst; |
| if (dst != odst) |
| *dst++ = '.'; |
| m = ((1 << b) - 1) << (8 - b); |
| dst += SPRINTF((dst, "%u", *src & m)); |
| size -= (size_t)(dst - t); |
| } |
| |
| /* Format CIDR /width. */ |
| if (size < sizeof "/32") |
| goto emsgsize; |
| dst += SPRINTF((dst, "/%u", bits)); |
| return (odst); |
| |
| emsgsize: |
| __set_errno (EMSGSIZE); |
| return (NULL); |
| } |