shadow/libmisc/tz.c

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/*
* Copyright 1991 - 1994, Julianne Frances Haugh and Chip Rosenthal
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include "rcsid.h"
RCSID ("$Id: tz.c,v 1.5 2003/04/22 10:59:22 kloczek Exp $")
#include <stdio.h>
#include <string.h>
#include "defines.h"
#include "getdef.h"
/*
* tz - return local timezone name
*
* tz() determines the name of the local timezone by reading the
* contents of the file named by ``fname''.
*/
char *tz (const char *fname)
{
FILE *fp = 0;
static char tzbuf[BUFSIZ];
const char *def_tz;
if ((fp = fopen (fname, "r")) == NULL ||
fgets (tzbuf, sizeof (tzbuf), fp) == NULL) {
if (!(def_tz = getdef_str ("ENV_TZ")) || def_tz[0] == '/')
def_tz = "TZ=CST6CDT";
strcpy (tzbuf, def_tz);
} else
tzbuf[strlen (tzbuf) - 1] = '\0';
if (fp)
(void) fclose (fp);
return tzbuf;
}