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