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Annotation of researchv9/libc/gen/timezone.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * The arguments are the number of minutes of time
        !             3:  * you are westward from Greenwich and whether DST is in effect.
        !             4:  * It returns a string
        !             5:  * giving the name of the local timezone.
        !             6:  *
        !             7:  * Sorry, I don't know all the names.
        !             8:  */
        !             9: 
        !            10: static struct zone {
        !            11:        int     offset;
        !            12:        char    *stdzone;
        !            13:        char    *dlzone;
        !            14: } zonetab[] = {
        !            15:        4*60, "AST", "ADT",             /* Atlantic */
        !            16:        5*60, "EST", "EDT",             /* Eastern */
        !            17:        6*60, "CST", "CDT",             /* Central */
        !            18:        7*60, "MST", "MDT",             /* Mountain */
        !            19:        8*60, "PST", "PDT",             /* Pacific */
        !            20:        0, "GMT", 0,                    /* Greenwich */
        !            21:        -1
        !            22: };
        !            23: 
        !            24: char *timezone(zone, dst)
        !            25: {
        !            26:        register struct zone *zp;
        !            27:        static char czone[10];
        !            28:        char *sign;
        !            29: 
        !            30:        for (zp=zonetab; zp->offset!=-1; zp++)
        !            31:                if (zp->offset==zone) {
        !            32:                        if (dst && zp->dlzone)
        !            33:                                return(zp->dlzone);
        !            34:                        if (!dst && zp->stdzone)
        !            35:                                return(zp->stdzone);
        !            36:                }
        !            37:        if (zone<0) {
        !            38:                zone = -zone;
        !            39:                sign = "+";
        !            40:        } else
        !            41:                sign = "-";
        !            42:        sprintf(czone, "GMT%s%d:%02d", sign, zone/60, zone%60);
        !            43:        return(czone);
        !            44: }

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