| 1 | /* |
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| 2 | * Copyright (c) 1996 by Internet Software Consortium. |
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| 3 | * |
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| 4 | * Permission to use, copy, modify, and distribute this software for any |
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| 5 | * purpose with or without fee is hereby granted, provided that the above |
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| 6 | * copyright notice and this permission notice appear in all copies. |
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| 7 | * |
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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| 9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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| 10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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| 11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 15 | * SOFTWARE. |
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| 16 | */ |
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| 17 | |
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| 18 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 19 | static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; |
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| 20 | #endif |
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| 21 | #include <sys/cdefs.h> |
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| 22 | #include <sys/types.h> |
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| 23 | |
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| 24 | #include <sys/types.h> |
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| 25 | #include <sys/socket.h> |
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| 26 | #include <netinet/in.h> |
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| 27 | #include <arpa/inet.h> |
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| 28 | |
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| 29 | #include <errno.h> |
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| 30 | #include <stdio.h> |
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| 31 | #include <string.h> |
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| 32 | |
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| 33 | #ifdef SPRINTF_CHAR |
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| 34 | # define SPRINTF(x) strlen(sprintf/**/x) |
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| 35 | #else |
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| 36 | # define SPRINTF(x) ((size_t)sprintf x) |
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| 37 | #endif |
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| 38 | |
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| 39 | /* |
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| 40 | * char * |
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| 41 | * inet_neta(src, dst, size) |
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| 42 | * format a in_addr_t network number into presentation format. |
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| 43 | * return: |
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| 44 | * pointer to dst, or NULL if an error occurred (check errno). |
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| 45 | * note: |
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| 46 | * format of ``src'' is as for inet_network(). |
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| 47 | * author: |
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| 48 | * Paul Vixie (ISC), July 1996 |
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| 49 | */ |
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| 50 | char * |
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| 51 | inet_neta(src, dst, size) |
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| 52 | in_addr_t src; |
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| 53 | char *dst; |
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| 54 | size_t size; |
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| 55 | { |
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| 56 | char *odst = dst; |
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| 57 | char *tp; |
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| 58 | |
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| 59 | while (src & 0xffffffff) { |
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| 60 | u_char b = (src & 0xff000000) >> 24; |
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| 61 | |
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| 62 | src <<= 8; |
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| 63 | if (b) { |
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| 64 | if (size < sizeof "255.") |
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| 65 | goto emsgsize; |
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| 66 | tp = dst; |
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| 67 | dst += SPRINTF((dst, "%u", b)); |
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| 68 | if (src != 0L) { |
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| 69 | *dst++ = '.'; |
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| 70 | *dst = '\0'; |
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| 71 | } |
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| 72 | size -= (size_t)(dst - tp); |
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| 73 | } |
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| 74 | } |
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| 75 | if (dst == odst) { |
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| 76 | if (size < sizeof "0.0.0.0") |
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| 77 | goto emsgsize; |
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| 78 | strcpy(dst, "0.0.0.0"); |
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| 79 | } |
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| 80 | return (odst); |
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| 81 | |
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| 82 | emsgsize: |
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| 83 | errno = EMSGSIZE; |
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| 84 | return (NULL); |
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| 85 | } |
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| 86 | |
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| 87 | /* |
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| 88 | * Weak aliases for applications that use certain private entry points, |
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| 89 | * and fail to include <arpa/inet.h>. |
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| 90 | */ |
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| 91 | #undef inet_neta |
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| 92 | __weak_reference(__inet_neta, inet_neta); |
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