51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Add missing "." to domain names.
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1995,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <string.h>
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/* Make a canonical copy of domain name SRC in DST. Behavior:
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foo -> foo.
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foo. -> foo.
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foo.. -> foo.
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foo\. -> foo\..
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foo\\. -> foo\\. */
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int
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__libc_ns_makecanon (const char *src, char *dst, size_t dstsize)
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{
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size_t n = strlen (src);
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if (n + sizeof "." > dstsize) /* sizeof == 2. */
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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strcpy (dst, src);
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while (n >= 1U && dst[n - 1] == '.') /* Ends in ".". */
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if (n >= 2U && dst[n - 2] == '\\' && /* Ends in "\.". */
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(n < 3U || dst[n - 3] != '\\')) /* But not "\\.". */
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break;
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else
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dst[--n] = '\0';
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dst[n++] = '.';
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dst[n] = '\0';
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return 0;
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}
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libc_hidden_def (__libc_ns_makecanon)
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