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138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)timezone.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define TZ_MAX_CHARS 255
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char *_tztab();
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/*
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* timezone --
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* The arguments are the number of minutes of time you are westward
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* from Greenwich and whether DST is in effect. It returns a string
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* giving the name of the local timezone. Should be replaced, in the
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* application code, by a call to localtime.
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*/
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static char czone[TZ_MAX_CHARS]; /* space for zone name */
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char *
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timezone(zone, dst)
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int zone,
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dst;
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{
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char *beg,
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*end;
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if ( (beg = getenv("TZNAME")) ) { /* set in environment */
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if ( (end = index(beg, ',')) ) {/* "PST,PDT" */
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if (dst)
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return(++end);
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*end = '\0';
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(void)strncpy(czone,beg,sizeof(czone) - 1);
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czone[sizeof(czone) - 1] = '\0';
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*end = ',';
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return(czone);
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}
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return(beg);
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}
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return(_tztab(zone,dst)); /* default: table or created zone */
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}
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static struct zone {
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int offset;
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char *stdzone;
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char *dlzone;
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} zonetab[] = {
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{-1*60, "MET", "MET DST"}, /* Middle European */
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{-2*60, "EET", "EET DST"}, /* Eastern European */
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{4*60, "AST", "ADT"}, /* Atlantic */
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{5*60, "EST", "EDT"}, /* Eastern */
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{6*60, "CST", "CDT"}, /* Central */
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{7*60, "MST", "MDT"}, /* Mountain */
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{8*60, "PST", "PDT"}, /* Pacific */
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#ifdef notdef
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/* there's no way to distinguish this from WET */
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{0, "GMT", 0}, /* Greenwich */
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#endif
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{0*60, "WET", "WET DST"}, /* Western European */
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{-10*60,"EST", "EST"}, /* Aust: Eastern */
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{-10*60+30,"CST", "CST"}, /* Aust: Central */
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{-8*60, "WST", 0}, /* Aust: Western */
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{-1}
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};
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/*
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* _tztab --
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* check static tables or create a new zone name; broken out so that
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* we can make a guess as to what the zone is if the standard tables
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* aren't in place in /etc. DO NOT USE THIS ROUTINE OUTSIDE OF THE
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* STANDARD LIBRARY.
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*/
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char *
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_tztab(zone,dst)
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int zone;
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int dst;
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{
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struct zone *zp;
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char sign;
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for (zp = zonetab; zp->offset != -1;++zp) /* static tables */
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if (zp->offset == zone) {
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if (dst && zp->dlzone)
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return(zp->dlzone);
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if (!dst && zp->stdzone)
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return(zp->stdzone);
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}
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if (zone < 0) { /* create one */
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zone = -zone;
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sign = '+';
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}
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else
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sign = '-';
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(void)snprintf(czone, sizeof(czone),
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"GMT%c%d:%02d",sign,zone / 60,zone % 60);
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return(czone);
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}
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