1 /* $OpenBSD: inet_neta.c,v 1.2 1997/04/05 21:13:12 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1996 by Internet Software Consortium. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 11 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 12 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 13 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 14 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 15 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 16 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 17 * SOFTWARE. 18 */ 19 20 #if defined(LIBC_SCCS) && !defined(lint) 21 #if 0 22 static const char rcsid[] = "$Id: inet_neta.c,v 1.2 1997/04/05 21:13:12 millert Exp $"; 23 #else 24 static const char rcsid[] = "$OpenBSD: inet_neta.c,v 1.2 1997/04/05 21:13:12 millert Exp $"; 25 #endif 26 #endif 27 28 #include <sys/types.h> 29 #include <sys/socket.h> 30 #include <netinet/in.h> 31 #include <arpa/inet.h> 32 33 #include <errno.h> 34 #include <stdio.h> 35 #include <string.h> 36 37 /* 38 * char * 39 * inet_neta(src, dst, size) 40 * format an in_addr_t network number into presentation format. 41 * return: 42 * pointer to dst, or NULL if an error occurred (check errno). 43 * note: 44 * format of ``src'' is as for inet_network(). 45 * author: 46 * Paul Vixie (ISC), July 1996 47 */ 48 char * 49 inet_neta(src, dst, size) 50 in_addr_t src; 51 char *dst; 52 size_t size; 53 { 54 char *odst = dst; 55 char *tp; 56 57 while (src & 0xffffffff) { 58 u_char b = (src & 0xff000000) >> 24; 59 60 src <<= 8; 61 if (b) { 62 if (size < sizeof "255.") 63 goto emsgsize; 64 tp = dst; 65 dst += sprintf(dst, "%u", b); 66 if (src != 0L) { 67 *dst++ = '.'; 68 *dst = '\0'; 69 } 70 size -= (size_t)(dst - tp); 71 } 72 } 73 if (dst == odst) { 74 if (size < sizeof "0.0.0.0") 75 goto emsgsize; 76 strcpy(dst, "0.0.0.0"); 77 } 78 return (odst); 79 80 emsgsize: 81 errno = EMSGSIZE; 82 return (NULL); 83 } 84