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Annotation of 43BSDReno/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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)timezone.c 5.9 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/types.h>
        !            25: #include <sys/time.h>
        !            26: #include <stdio.h>
        !            27: #include <tzfile.h>
        !            28: 
        !            29: /*
        !            30:  * timezone --
        !            31:  *     The arguments are the number of minutes of time you are westward
        !            32:  *     from Greenwich and whether DST is in effect.  It returns a string
        !            33:  *     giving the name of the local timezone.  Should be replaced, in the
        !            34:  *     application code, by a call to localtime.
        !            35:  */
        !            36: 
        !            37: static char    czone[TZ_MAX_CHARS];            /* space for zone name */
        !            38: 
        !            39: char *
        !            40: timezone(zone, dst)
        !            41:        int     zone,
        !            42:                dst;
        !            43: {
        !            44:        register char   *beg,
        !            45:                        *end;
        !            46:        char    *getenv(), *index(), *strncpy(), *_tztab();
        !            47: 
        !            48:        if (beg = getenv("TZNAME")) {           /* set in environment */
        !            49:                if (end = index(beg, ',')) {    /* "PST,PDT" */
        !            50:                        if (dst)
        !            51:                                return(++end);
        !            52:                        *end = '\0';
        !            53:                        (void)strncpy(czone,beg,sizeof(czone) - 1);
        !            54:                        czone[sizeof(czone) - 1] = '\0';
        !            55:                        *end = ',';
        !            56:                        return(czone);
        !            57:                }
        !            58:                return(beg);
        !            59:        }
        !            60:        return(_tztab(zone,dst));       /* default: table or created zone */
        !            61: }
        !            62: 
        !            63: static struct zone {
        !            64:        int     offset;
        !            65:        char    *stdzone;
        !            66:        char    *dlzone;
        !            67: } zonetab[] = {
        !            68:        -1*60,  "MET",  "MET DST",      /* Middle European */
        !            69:        -2*60,  "EET",  "EET DST",      /* Eastern European */
        !            70:        4*60,   "AST",  "ADT",          /* Atlantic */
        !            71:        5*60,   "EST",  "EDT",          /* Eastern */
        !            72:        6*60,   "CST",  "CDT",          /* Central */
        !            73:        7*60,   "MST",  "MDT",          /* Mountain */
        !            74:        8*60,   "PST",  "PDT",          /* Pacific */
        !            75: #ifdef notdef
        !            76:        /* there's no way to distinguish this from WET */
        !            77:        0,      "GMT",  0,              /* Greenwich */
        !            78: #endif
        !            79:        0*60,   "WET",  "WET DST",      /* Western European */
        !            80:        -10*60, "EST",  "EST",          /* Aust: Eastern */
        !            81:      -10*60+30,        "CST",  "CST",          /* Aust: Central */
        !            82:        -8*60,  "WST",  0,              /* Aust: Western */
        !            83:        -1
        !            84: };
        !            85: 
        !            86: /*
        !            87:  * _tztab --
        !            88:  *     check static tables or create a new zone name; broken out so that
        !            89:  *     we can make a guess as to what the zone is if the standard tables
        !            90:  *     aren't in place in /etc.  DO NOT USE THIS ROUTINE OUTSIDE OF THE
        !            91:  *     STANDARD LIBRARY.
        !            92:  */
        !            93: char *
        !            94: _tztab(zone,dst)
        !            95:        register int    zone;
        !            96:        int     dst;
        !            97: {
        !            98:        register struct zone    *zp;
        !            99:        register char   sign;
        !           100: 
        !           101:        for (zp = zonetab; zp->offset != -1;++zp)       /* static tables */
        !           102:                if (zp->offset == zone) {
        !           103:                        if (dst && zp->dlzone)
        !           104:                                return(zp->dlzone);
        !           105:                        if (!dst && zp->stdzone)
        !           106:                                return(zp->stdzone);
        !           107:                }
        !           108: 
        !           109:        if (zone < 0) {                                 /* create one */
        !           110:                zone = -zone;
        !           111:                sign = '+';
        !           112:        }
        !           113:        else
        !           114:                sign = '-';
        !           115:        (void)sprintf(czone,"GMT%c%d:%02d",sign,zone / 60,zone % 60);
        !           116:        return(czone);
        !           117: }

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