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Annotation of 43BSDTahoe/old/dump.4.1/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 "include.4.1/sys/types.h"
        !            12: #include "include.4.1/time.h"
        !            13: /*
        !            14:  * Convert a ctime(3) format string into a system format date.
        !            15:  * Return the date thus calculated.
        !            16:  *
        !            17:  * Return -1 if the string is not in ctime format.
        !            18:  */
        !            19: 
        !            20: /*
        !            21:  * Offsets into the ctime string to various parts.
        !            22:  */
        !            23: 
        !            24: #define        E_MONTH         4
        !            25: #define        E_DAY           8
        !            26: #define        E_HOUR          11
        !            27: #define        E_MINUTE        14
        !            28: #define        E_SECOND        17
        !            29: #define        E_YEAR          20
        !            30: 
        !            31: time_t unctime(str)
        !            32:        char *str;
        !            33: {
        !            34:        struct tm then;
        !            35:        char dbuf[30];
        !            36:        time_t emitl();
        !            37: 
        !            38:        if (strlen(str) != 25)
        !            39:                str[25] = 0;
        !            40:        strcpy(dbuf, str);
        !            41:        dbuf[E_MONTH+3] = 0;
        !            42:        if ( (then.tm_mon = lookup(&dbuf[E_MONTH])) < 0)
        !            43:                return(-1);;
        !            44:        then.tm_mday = atoi(&dbuf[E_DAY]);
        !            45:        then.tm_hour = atoi(&dbuf[E_HOUR]);
        !            46:        then.tm_min = atoi(&dbuf[E_MINUTE]);
        !            47:        then.tm_sec = atoi(&dbuf[E_SECOND]);
        !            48:        then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
        !            49:        return(emitl(&then));
        !            50: }
        !            51: 
        !            52: static char months[] =
        !            53:        "JanFebMarAprMayJunJulAugSepOctNovDec";
        !            54: 
        !            55: static
        !            56: lookup(str)
        !            57:        char *str;
        !            58: {
        !            59:        register char *cp, *cp2;
        !            60: 
        !            61:        for (cp = months, cp2 = str; *cp != 0; cp += 3)
        !            62:                if (strncmp(cp, cp2, 3) == 0)
        !            63:                        return((cp-months) / 3);
        !            64:        return(-1);
        !            65: }
        !            66: /*
        !            67:  * Routine to convert a localtime(3) format date back into
        !            68:  * a system format date.
        !            69:  *
        !            70:  *     Use a binary search.
        !            71:  */
        !            72: 
        !            73: struct tm *localtime();
        !            74: 
        !            75: time_t emitl(dp)
        !            76:        struct tm *dp;
        !            77: {
        !            78:        time_t conv;
        !            79:        register int i, bit;
        !            80:        struct tm dcopy;
        !            81: 
        !            82:        dcopy = *dp;
        !            83:        dp = &dcopy;
        !            84:        conv = 0;
        !            85:        for (i = 31; i >= 0; i--) {
        !            86:                bit = 1 << i;
        !            87:                conv |= bit;
        !            88:                if (dcmp(localtime(&conv), dp) > 0)
        !            89:                        conv &= ~bit;
        !            90:        }
        !            91:        return(conv);
        !            92: }
        !            93: 
        !            94: /*
        !            95:  * Compare two localtime dates, return result.
        !            96:  */
        !            97: 
        !            98: #define DECIDE(a) \
        !            99:        if (dp->a > dp2->a) \
        !           100:                return(1); \
        !           101:        if (dp->a < dp2->a) \
        !           102:                return(-1)
        !           103: 
        !           104: static
        !           105: dcmp(dp, dp2)
        !           106:        register struct tm *dp, *dp2;
        !           107: {
        !           108: 
        !           109:        DECIDE(tm_year);
        !           110:        DECIDE(tm_mon);
        !           111:        DECIDE(tm_mday);
        !           112:        DECIDE(tm_hour);
        !           113:        DECIDE(tm_min);
        !           114:        DECIDE(tm_sec);
        !           115:        return(0);
        !           116: }

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