1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1996,1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #if defined(LIBC_SCCS) && !defined(lint) 21 static const char rcsid[] = "$Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $"; 22 #endif 23 #include <sys/cdefs.h> 24 __FBSDID("$FreeBSD$"); 25 26 #include "port_before.h" 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 #include "port_after.h" 38 39 #ifdef SPRINTF_CHAR 40 # define SPRINTF(x) strlen(sprintf/**/x) 41 #else 42 # define SPRINTF(x) ((size_t)sprintf x) 43 #endif 44 45 /*% 46 * char * 47 * inet_neta(src, dst, size) 48 * format an in_addr_t network number into presentation format. 49 * return: 50 * pointer to dst, or NULL if an error occurred (check errno). 51 * note: 52 * format of ``src'' is as for inet_network(). 53 * author: 54 * Paul Vixie (ISC), July 1996 55 */ 56 char * 57 inet_neta(in_addr_t src, char *dst, size_t size) 58 { 59 char *odst = dst; 60 char *tp; 61 62 while (src & 0xffffffff) { 63 u_char b = (src & 0xff000000) >> 24; 64 65 src <<= 8; 66 if (b) { 67 if (size < sizeof "255.") 68 goto emsgsize; 69 tp = dst; 70 dst += SPRINTF((dst, "%u", b)); 71 if (src != 0L) { 72 *dst++ = '.'; 73 *dst = '\0'; 74 } 75 size -= (size_t)(dst - tp); 76 } 77 } 78 if (dst == odst) { 79 if (size < sizeof "0.0.0.0") 80 goto emsgsize; 81 strcpy(dst, "0.0.0.0"); 82 } 83 return (odst); 84 85 emsgsize: 86 errno = EMSGSIZE; 87 return (NULL); 88 } 89 90 /* 91 * Weak aliases for applications that use certain private entry points, 92 * and fail to include <arpa/inet.h>. 93 */ 94 #undef inet_neta 95 __weak_reference(__inet_neta, inet_neta); 96 97 /*! \file */ 98