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Annotation of 43BSD/etc/dump/unctime.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)unctime.c  5.1 (Berkeley) 6/5/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include <sys/types.h>
        !            12: #include <sys/time.h>
        !            13: #include <stdio.h>
        !            14: /*
        !            15:  * Convert a ctime(3) format string into a system format date.
        !            16:  * Return the date thus calculated.
        !            17:  *
        !            18:  * Return -1 if the string is not in ctime format.
        !            19:  */
        !            20: 
        !            21: /*
        !            22:  * Offsets into the ctime string to various parts.
        !            23:  */
        !            24: 
        !            25: #define        E_MONTH         4
        !            26: #define        E_DAY           8
        !            27: #define        E_HOUR          11
        !            28: #define        E_MINUTE        14
        !            29: #define        E_SECOND        17
        !            30: #define        E_YEAR          20
        !            31: 
        !            32: time_t unctime(str)
        !            33:        char *str;
        !            34: {
        !            35:        struct tm then;
        !            36:        char dbuf[30];
        !            37:        time_t emitl();
        !            38: 
        !            39:        if (strlen(str) != 25)
        !            40:                str[25] = 0;
        !            41:        strcpy(dbuf, str);
        !            42:        dbuf[E_MONTH+3] = 0;
        !            43:        if ( (then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) {
        !            44:                return(-1);;
        !            45:        }
        !            46:        then.tm_mday = atoi(&dbuf[E_DAY]);
        !            47:        then.tm_hour = atoi(&dbuf[E_HOUR]);
        !            48:        then.tm_min = atoi(&dbuf[E_MINUTE]);
        !            49:        then.tm_sec = atoi(&dbuf[E_SECOND]);
        !            50:        then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
        !            51:        return(emitl(&then));
        !            52: }
        !            53: 
        !            54: static char months[] =
        !            55:        "JanFebMarAprMayJunJulAugSepOctNovDec";
        !            56: 
        !            57: static
        !            58: lookup(str)
        !            59:        char *str;
        !            60: {
        !            61:        register char *cp, *cp2;
        !            62: 
        !            63:        for (cp = months, cp2 = str; *cp != 0; cp += 3)
        !            64:                if (strncmp(cp, cp2, 3) == 0)
        !            65:                        return((cp-months) / 3);
        !            66:        return(-1);
        !            67: }
        !            68: /*
        !            69:  * Routine to convert a localtime(3) format date back into
        !            70:  * a system format date.
        !            71:  *
        !            72:  *     Use a binary search.
        !            73:  */
        !            74: 
        !            75: struct tm *localtime();
        !            76: 
        !            77: time_t emitl(dp)
        !            78:        struct tm *dp;
        !            79: {
        !            80:        time_t conv;
        !            81:        register int i, bit;
        !            82:        struct tm dcopy;
        !            83: 
        !            84:        dcopy = *dp;
        !            85:        dp = &dcopy;
        !            86:        conv = 0;
        !            87:        for (i = 30; i >= 0; i--) {
        !            88:                bit = 1 << i;
        !            89:                conv |= bit;
        !            90:                if (dcmp(localtime(&conv), dp) > 0)
        !            91:                        conv &= ~bit;
        !            92:        }
        !            93:        return(conv);
        !            94: }
        !            95: 
        !            96: /*
        !            97:  * Compare two localtime dates, return result.
        !            98:  */
        !            99: 
        !           100: #define DECIDE(a) \
        !           101:        if (dp->a > dp2->a) \
        !           102:                return(1); \
        !           103:        if (dp->a < dp2->a) \
        !           104:                return(-1)
        !           105: 
        !           106: static
        !           107: dcmp(dp, dp2)
        !           108:        register struct tm *dp, *dp2;
        !           109: {
        !           110: 
        !           111:        DECIDE(tm_year);
        !           112:        DECIDE(tm_mon);
        !           113:        DECIDE(tm_mday);
        !           114:        DECIDE(tm_hour);
        !           115:        DECIDE(tm_min);
        !           116:        DECIDE(tm_sec);
        !           117:        return(0);
        !           118: }

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