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 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static const char rcsid[] = "$Id: inet_neta.c,v 1.1.206.1 2004/03/09 08:33:33 marka Exp $"; 20 #endif 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD$"); 23 24 #include "port_before.h" 25 26 #include <sys/types.h> 27 #include <sys/socket.h> 28 #include <netinet/in.h> 29 #include <arpa/inet.h> 30 31 #include <errno.h> 32 #include <stdio.h> 33 #include <string.h> 34 35 #include "port_after.h" 36 37 #ifdef SPRINTF_CHAR 38 # define SPRINTF(x) strlen(sprintf/**/x) 39 #else 40 # define SPRINTF(x) ((size_t)sprintf x) 41 #endif 42 43 /* 44 * char * 45 * inet_neta(src, dst, size) 46 * format an in_addr_t network number into presentation format. 47 * return: 48 * pointer to dst, or NULL if an error occurred (check errno). 49 * note: 50 * format of ``src'' is as for inet_network(). 51 * author: 52 * Paul Vixie (ISC), July 1996 53 */ 54 char * 55 inet_neta(src, dst, size) 56 in_addr_t src; 57 char *dst; 58 size_t size; 59 { 60 char *odst = dst; 61 char *tp; 62 63 while (src & 0xffffffff) { 64 u_char b = (src & 0xff000000) >> 24; 65 66 src <<= 8; 67 if (b) { 68 if (size < sizeof "255.") 69 goto emsgsize; 70 tp = dst; 71 dst += SPRINTF((dst, "%u", b)); 72 if (src != 0L) { 73 *dst++ = '.'; 74 *dst = '\0'; 75 } 76 size -= (size_t)(dst - tp); 77 } 78 } 79 if (dst == odst) { 80 if (size < sizeof "0.0.0.0") 81 goto emsgsize; 82 strcpy(dst, "0.0.0.0"); 83 } 84 return (odst); 85 86 emsgsize: 87 errno = EMSGSIZE; 88 return (NULL); 89 } 90 91 /* 92 * Weak aliases for applications that use certain private entry points, 93 * and fail to include <arpa/inet.h>. 94 */ 95 #undef inet_neta 96 __weak_reference(__inet_neta, inet_neta); 97