129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* $NetBSD: aliasname.c,v 1.1 2002/02/13 07:45:52 yamt Exp $ */
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/*-
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* Copyright (c)2002 YAMAMOTO Takashi,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: aliasname.c,v 1.1 2002/02/13 07:45:52 yamt Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "aliasname_local.h"
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__inline int __is_ws(char);
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__inline int __is_ws(char ch)
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{
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return (ch == ' ' || ch == '\t');
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}
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const char *
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__unaliasname(const char *dbname, const char *alias, void *buf, size_t bufsize)
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{
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FILE *fp = NULL;
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const char *result = alias;
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size_t resultlen;
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size_t aliaslen;
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const char *p;
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size_t len;
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_DIAGASSERT(dbname != NULL);
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_DIAGASSERT(alias != NULL);
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_DIAGASSERT(buf != NULL);
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fp = fopen(dbname, "r");
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if (fp == NULL)
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goto quit;
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aliaslen = strlen(alias);
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while (/*CONSTCOND*/ 1) {
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p = fgetln(fp, &len);
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if (p == NULL)
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goto quit; /* eof or error */
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_DIAGASSERT(len != 0);
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/* ignore terminating NL */
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if (p[len - 1] == '\n')
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len--;
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/* ignore null line and comment */
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if (len == 0 || p[0] == '#')
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continue;
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if (aliaslen > len)
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continue;
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if (memcmp(alias, p, aliaslen))
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continue;
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p += aliaslen;
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len -= aliaslen;
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if (len == 0 || !__is_ws(*p))
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continue;
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/* entry was found here */
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break;
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/* NOTREACHED */
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}
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/* skip white spaces */
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do {
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p++;
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len--;
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} while (len != 0 && __is_ws(*p));
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if (len == 0)
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goto quit;
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/* count length of result */
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resultlen = 0;
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while (resultlen < len && !__is_ws(*p))
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resultlen++;
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/* check if space is enough */
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if (bufsize < resultlen + 1)
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goto quit;
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memcpy(buf, p, resultlen);
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((char *)buf)[resultlen] = 0;
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result = buf;
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quit:
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if (fp)
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fclose(fp);
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return result;
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}
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