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FreeBSD/Linux Kernel Cross Reference
sys/gen/timezone.c

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    1 /*
    2  * Copyright (c) 1987, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #if defined(LIBC_SCCS) && !defined(lint)
   31 static char sccsid[] = "@(#)timezone.c  8.1 (Berkeley) 6/4/93";
   32 #endif /* LIBC_SCCS and not lint */
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: stable/8/lib/libc/gen/timezone.c 165903 2007-01-09 00:28:16Z imp $");
   35 
   36 #include <sys/types.h>
   37 #include <sys/time.h>
   38 #include <stdio.h>
   39 #include <stdlib.h>
   40 #include <string.h>
   41 #define TZ_MAX_CHARS 255
   42 
   43 char *_tztab();
   44 
   45 /*
   46  * timezone --
   47  *      The arguments are the number of minutes of time you are westward
   48  *      from Greenwich and whether DST is in effect.  It returns a string
   49  *      giving the name of the local timezone.  Should be replaced, in the
   50  *      application code, by a call to localtime.
   51  */
   52 
   53 static char     czone[TZ_MAX_CHARS];            /* space for zone name */
   54 
   55 char *
   56 timezone(zone, dst)
   57         int     zone,
   58                 dst;
   59 {
   60         char    *beg,
   61                         *end;
   62 
   63         if ( (beg = getenv("TZNAME")) ) {       /* set in environment */
   64                 if ( (end = index(beg, ',')) ) {/* "PST,PDT" */
   65                         if (dst)
   66                                 return(++end);
   67                         *end = '\0';
   68                         (void)strncpy(czone,beg,sizeof(czone) - 1);
   69                         czone[sizeof(czone) - 1] = '\0';
   70                         *end = ',';
   71                         return(czone);
   72                 }
   73                 return(beg);
   74         }
   75         return(_tztab(zone,dst));       /* default: table or created zone */
   76 }
   77 
   78 static struct zone {
   79         int     offset;
   80         char    *stdzone;
   81         char    *dlzone;
   82 } zonetab[] = {
   83         {-1*60, "MET",  "MET DST"},     /* Middle European */
   84         {-2*60, "EET",  "EET DST"},     /* Eastern European */
   85         {4*60,  "AST",  "ADT"},         /* Atlantic */
   86         {5*60,  "EST",  "EDT"},         /* Eastern */
   87         {6*60,  "CST",  "CDT"},         /* Central */
   88         {7*60,  "MST",  "MDT"},         /* Mountain */
   89         {8*60,  "PST",  "PDT"},         /* Pacific */
   90 #ifdef notdef
   91         /* there's no way to distinguish this from WET */
   92         {0,     "GMT",  0},             /* Greenwich */
   93 #endif
   94         {0*60,  "WET",  "WET DST"},     /* Western European */
   95         {-10*60,"EST",  "EST"},         /* Aust: Eastern */
   96      {-10*60+30,"CST",  "CST"},         /* Aust: Central */
   97         {-8*60, "WST",  0},             /* Aust: Western */
   98         {-1}
   99 };
  100 
  101 /*
  102  * _tztab --
  103  *      check static tables or create a new zone name; broken out so that
  104  *      we can make a guess as to what the zone is if the standard tables
  105  *      aren't in place in /etc.  DO NOT USE THIS ROUTINE OUTSIDE OF THE
  106  *      STANDARD LIBRARY.
  107  */
  108 char *
  109 _tztab(zone,dst)
  110         int     zone;
  111         int     dst;
  112 {
  113         struct zone     *zp;
  114         char    sign;
  115 
  116         for (zp = zonetab; zp->offset != -1;++zp)       /* static tables */
  117                 if (zp->offset == zone) {
  118                         if (dst && zp->dlzone)
  119                                 return(zp->dlzone);
  120                         if (!dst && zp->stdzone)
  121                                 return(zp->stdzone);
  122                 }
  123 
  124         if (zone < 0) {                                 /* create one */
  125                 zone = -zone;
  126                 sign = '+';
  127         }
  128         else
  129                 sign = '-';
  130         (void)snprintf(czone, sizeof(czone),
  131             "GMT%c%d:%02d",sign,zone / 60,zone % 60);
  132         return(czone);
  133 }

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