1 /* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996,1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * $Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $ 18 */ 19 20 #include "port_before.h" 21 22 #include <sys/types.h> 23 #include <sys/socket.h> 24 #include <netinet/in.h> 25 #include <arpa/inet.h> 26 27 #include <errno.h> 28 #include <stdio.h> 29 #include <string.h> 30 31 #include "port_after.h" 32 33 /*% 34 * char * 35 * inet_neta(src, dst, size) 36 * format an in_addr_t network number into presentation format. 37 * return: 38 * pointer to dst, or NULL if an error occurred (check errno). 39 * note: 40 * format of ``src'' is as for inet_network(). 41 * author: 42 * Paul Vixie (ISC), July 1996 43 */ 44 char * 45 inet_neta(in_addr_t src, char *dst, size_t size) 46 { 47 char *odst = dst; 48 char *tp; 49 50 while (src & 0xffffffff) { 51 u_char b = (src & 0xff000000) >> 24; 52 53 src <<= 8; 54 if (b) { 55 if (size < sizeof "255.") 56 goto emsgsize; 57 tp = dst; 58 dst += sprintf(dst, "%u", b); 59 if (src != 0L) { 60 *dst++ = '.'; 61 *dst = '\0'; 62 } 63 size -= (size_t)(dst - tp); 64 } 65 } 66 if (dst == odst) { 67 if (size < sizeof "0.0.0.0") 68 goto emsgsize; 69 strcpy(dst, "0.0.0.0"); 70 } 71 return (odst); 72 73 emsgsize: 74 errno = EMSGSIZE; 75 return (NULL); 76 } 77 78 /* 79 * Weak aliases for applications that use certain private entry points, 80 * and fail to include <arpa/inet.h>. 81 */ 82 #undef inet_neta 83 __weak_reference(__inet_neta, inet_neta); 84