1 /* $NetBSD: inet_neta.c,v 1.3 2012/06/25 22:32:44 abs 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 #include <sys/cdefs.h> 21 #if defined(LIBC_SCCS) && !defined(lint) 22 #if 0 23 static const char rcsid[] = "Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp "; 24 #else 25 __RCSID("$NetBSD: inet_neta.c,v 1.3 2012/06/25 22:32:44 abs Exp $"); 26 #endif 27 #endif 28 29 #include "port_before.h" 30 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #include "port_after.h" 42 43 /* 44 * char * 45 * inet_neta(src, dst, size) 46 * format a u_long 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(u_long src, char *dst, size_t size) 56 { 57 char *odst = dst; 58 char *ep; 59 int advance; 60 61 assert(dst != NULL); 62 63 if (src == 0x00000000) { 64 if (size < sizeof "0.0.0.0") 65 goto emsgsize; 66 strlcpy(dst, "0.0.0.0", size); 67 return dst; 68 } 69 ep = dst + size; 70 if (ep <= dst) 71 goto emsgsize; 72 while (src & 0xffffffffUL) { 73 u_char b = (u_char)((src & 0xff000000UL) >> 24); 74 75 src <<= 8; 76 if (b || src) { 77 advance = snprintf(dst, (size_t)(ep - dst), "%u", b); 78 if (advance <= 0 || advance >= ep - dst) 79 goto emsgsize; 80 dst += advance; 81 if (src != 0L) { 82 if (dst + 1 >= ep) 83 goto emsgsize; 84 *dst++ = '.'; 85 *dst = '\0'; 86 } 87 } 88 } 89 return (odst); 90 91 emsgsize: 92 errno = EMSGSIZE; 93 return (NULL); 94 } 95 96 #undef inet_neta 97 #pragma weak inet_neta = __inet_neta 98