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