43fa6fe319
identifier namespace by renaming non standard functions and variables such that they have a leading underscore. The library will use those names internally. Weak aliases are used to provide the original names to the API. This is only the first part of this change. It is most of the functions which are implemented in C for all NetBSD ports. Subsequent changes are to add the same support to the remaining C files, to assembly files, and to the automagically generated assembly source used for system calls. When all of the above is done, ports with weak alias support should add a definition for __weak_alias to <sys/cdefs.h>.
147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/* $NetBSD: timezone.c,v 1.8 1997/07/21 14:07:40 jtc Exp $ */
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/*
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)timezone.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: timezone.c,v 1.8 1997/07/21 14:07:40 jtc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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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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#include <tzfile.h>
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#include "extern.h"
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#ifdef __weak_alias
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__weak_alias(timezone,_timezone);
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#endif
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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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register char *beg,
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*end;
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if ((beg = getenv("TZNAME")) != NULL) { /* set in environment */
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if ((end = strchr(beg, ',')) != NULL) { /* "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, NULL, NULL }
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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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register int zone;
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int dst;
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{
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register struct zone *zp;
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register 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, TZ_MAX_CHARS, "GMT%c%d:%02d", sign, zone / 60,
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zone % 60);
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return(czone);
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}
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