1 /* 2 * Copyright (c) 1997-2000 by Sun Microsystems, Inc. 3 * All rights reserved. 4 */ 5 6 /* 7 * Copyright (c) 1996,1999 by Internet Software Consortium. 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 14 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 16 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 17 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 18 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 19 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 * SOFTWARE. 21 */ 22 23 #pragma ident "%Z%%M% %I% %E% SMI" 24 25 #if defined(LIBC_SCCS) && !defined(lint) 26 static const char rcsid[] = "$Id: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $"; 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 <errno.h> 37 #include <stdio.h> 38 #include <string.h> 39 40 #include "port_after.h" 41 42 #ifdef SPRINTF_CHAR 43 # define SPRINTF(x) strlen(sprintf/**/x) 44 #else 45 # define SPRINTF(x) ((size_t)sprintf x) 46 #endif 47 48 /* 49 * char * 50 * inet_neta(src, dst, size) 51 * format a u_long network number into presentation format. 52 * return: 53 * pointer to dst, or NULL if an error occurred (check errno). 54 * note: 55 * format of ``src'' is as for inet_network(). 56 * author: 57 * Paul Vixie (ISC), July 1996 58 */ 59 char * 60 inet_neta(src, dst, size) 61 u_long src; 62 char *dst; 63 size_t size; 64 { 65 char *odst = dst; 66 char *tp; 67 68 while (src & 0xffffffff) { 69 u_char b = (src & 0xff000000) >> 24; 70 71 src <<= 8; 72 if (b) { 73 if (size < sizeof "255.") 74 goto emsgsize; 75 tp = dst; 76 dst += SPRINTF((dst, "%u", b)); 77 if (src != 0L) { 78 *dst++ = '.'; 79 *dst = '\0'; 80 } 81 size -= (size_t)(dst - tp); 82 } 83 } 84 if (dst == odst) { 85 if (size < sizeof "0.0.0.0") 86 goto emsgsize; 87 strcpy(dst, "0.0.0.0"); 88 } 89 return (odst); 90 91 emsgsize: 92 errno = EMSGSIZE; 93 return (NULL); 94 } 95