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Annotation of 43BSDTahoe/lib/libc/gen/timezone.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1987 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)timezone.c 5.8 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <sys/time.h>
        !            24: #include <stdio.h>
        !            25: #include <tzfile.h>
        !            26: 
        !            27: /*
        !            28:  * timezone --
        !            29:  *     The arguments are the number of minutes of time you are westward
        !            30:  *     from Greenwich and whether DST is in effect.  It returns a string
        !            31:  *     giving the name of the local timezone.  Should be replaced, in the
        !            32:  *     application code, by a call to localtime.
        !            33:  */
        !            34: 
        !            35: static char    czone[TZ_MAX_CHARS];            /* space for zone name */
        !            36: 
        !            37: char *
        !            38: timezone(zone, dst)
        !            39:        int     zone,
        !            40:                dst;
        !            41: {
        !            42:        register char   *beg,
        !            43:                        *end;
        !            44:        char    *getenv(), *index(), *strncpy(), *_tztab();
        !            45: 
        !            46:        if (beg = getenv("TZNAME")) {           /* set in environment */
        !            47:                if (end = index(beg, ',')) {    /* "PST,PDT" */
        !            48:                        if (dst)
        !            49:                                return(++end);
        !            50:                        *end = '\0';
        !            51:                        (void)strncpy(czone,beg,sizeof(czone) - 1);
        !            52:                        czone[sizeof(czone) - 1] = '\0';
        !            53:                        *end = ',';
        !            54:                        return(czone);
        !            55:                }
        !            56:                return(beg);
        !            57:        }
        !            58:        return(_tztab(zone,dst));       /* default: table or created zone */
        !            59: }
        !            60: 
        !            61: static struct zone {
        !            62:        int     offset;
        !            63:        char    *stdzone;
        !            64:        char    *dlzone;
        !            65: } zonetab[] = {
        !            66:        -1*60,  "MET",  "MET DST",      /* Middle European */
        !            67:        -2*60,  "EET",  "EET DST",      /* Eastern European */
        !            68:        4*60,   "AST",  "ADT",          /* Atlantic */
        !            69:        5*60,   "EST",  "EDT",          /* Eastern */
        !            70:        6*60,   "CST",  "CDT",          /* Central */
        !            71:        7*60,   "MST",  "MDT",          /* Mountain */
        !            72:        8*60,   "PST",  "PDT",          /* Pacific */
        !            73: #ifdef notdef
        !            74:        /* there's no way to distinguish this from WET */
        !            75:        0,      "GMT",  0,              /* Greenwich */
        !            76: #endif
        !            77:        0*60,   "WET",  "WET DST",      /* Western European */
        !            78:        -10*60, "EST",  "EST",          /* Aust: Eastern */
        !            79:      -10*60+30,        "CST",  "CST",          /* Aust: Central */
        !            80:        -8*60,  "WST",  0,              /* Aust: Western */
        !            81:        -1
        !            82: };
        !            83: 
        !            84: /*
        !            85:  * _tztab --
        !            86:  *     check static tables or create a new zone name; broken out so that
        !            87:  *     we can make a guess as to what the zone is if the standard tables
        !            88:  *     aren't in place in /etc.  DO NOT USE THIS ROUTINE OUTSIDE OF THE
        !            89:  *     STANDARD LIBRARY.
        !            90:  */
        !            91: char *
        !            92: _tztab(zone,dst)
        !            93:        register int    zone;
        !            94:        int     dst;
        !            95: {
        !            96:        register struct zone    *zp;
        !            97:        register char   sign;
        !            98: 
        !            99:        for (zp = zonetab; zp->offset != -1;++zp)       /* static tables */
        !           100:                if (zp->offset == zone) {
        !           101:                        if (dst && zp->dlzone)
        !           102:                                return(zp->dlzone);
        !           103:                        if (!dst && zp->stdzone)
        !           104:                                return(zp->stdzone);
        !           105:                }
        !           106: 
        !           107:        if (zone < 0) {                                 /* create one */
        !           108:                zone = -zone;
        !           109:                sign = '+';
        !           110:        }
        !           111:        else
        !           112:                sign = '-';
        !           113:        (void)sprintf(czone,"GMT%c%d:%02d",sign,zone / 60,zone % 60);
        !           114:        return(czone);
        !           115: }

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