| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
| 3 | * |
| 4 | * Permission to use, copy, modify, and distribute this software for any |
| 5 | * purpose with or without fee is hereby granted, provided that the above |
| 6 | * copyright notice and this permission notice appear in all copies. |
| 7 | * |
| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| 9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| 10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| 11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| 14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 15 | * SOFTWARE. |
| 16 | */ |
| 17 | |
| 18 | #if defined(LIBC_SCCS) && !defined(lint) |
| 19 | static const char rcsid[] = "$BINDId: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $"; |
| 20 | #endif |
| 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 | #ifdef SPRINTF_CHAR |
| 32 | # define SPRINTF(x) strlen(sprintf/**/x) |
| 33 | #else |
| 34 | # define SPRINTF(x) ((size_t)sprintf x) |
| 35 | #endif |
| 36 | |
| 37 | /* |
| 38 | * char * |
| 39 | * inet_neta(src, dst, size) |
| 40 | * format a u_long network number into presentation format. |
| 41 | * return: |
| 42 | * pointer to dst, or NULL if an error occurred (check errno). |
| 43 | * note: |
| 44 | * format of ``src'' is as for inet_network(). |
| 45 | * author: |
| 46 | * Paul Vixie (ISC), July 1996 |
| 47 | */ |
| 48 | char * |
| 49 | inet_neta(src, dst, size) |
| 50 | u_int32_t src; |
| 51 | char *dst; |
| 52 | size_t size; |
| 53 | { |
| 54 | char *odst = dst; |
| 55 | char *tp; |
| 56 | |
| 57 | while (src & 0xffffffff) { |
| 58 | u_char b = (src & 0xff000000) >> 24; |
| 59 | |
| 60 | src <<= 8; |
| 61 | if (b) { |
| 62 | if (size < sizeof "255.") |
| 63 | goto emsgsize; |
| 64 | tp = dst; |
| 65 | dst += SPRINTF((dst, "%u", b)); |
| 66 | if (src != 0L) { |
| 67 | *dst++ = '.'; |
| 68 | *dst = '\0'; |
| 69 | } |
| 70 | size -= (size_t)(dst - tp); |
| 71 | } |
| 72 | } |
| 73 | if (dst == odst) { |
| 74 | if (size < sizeof "0.0.0.0") |
| 75 | goto emsgsize; |
| 76 | strcpy(dst, "0.0.0.0"); |
| 77 | } |
| 78 | return (odst); |
| 79 | |
| 80 | emsgsize: |
| 81 | __set_errno (EMSGSIZE); |
| 82 | return (NULL); |
| 83 | } |