Return to unctime.c CVS log

Up to [CSRG BSD Unix] / 42BSD / etc / dump

Annotation of 42BSD/etc/dump/unctime.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)unctime.c  1.5 (Berkeley) 8/13/83";
        !             3: #endif
        !             4: 
        !             5: #include <sys/types.h>
        !             6: #include <sys/time.h>
        !             7: #include <stdio.h>
        !             8: /*
        !             9:  * Convert a ctime(3) format string into a system format date.
        !            10:  * Return the date thus calculated.
        !            11:  *
        !            12:  * Return -1 if the string is not in ctime format.
        !            13:  */
        !            14: 
        !            15: /*
        !            16:  * Offsets into the ctime string to various parts.
        !            17:  */
        !            18: 
        !            19: #define        E_MONTH         4
        !            20: #define        E_DAY           8
        !            21: #define        E_HOUR          11
        !            22: #define        E_MINUTE        14
        !            23: #define        E_SECOND        17
        !            24: #define        E_YEAR          20
        !            25: 
        !            26: time_t unctime(str)
        !            27:        char *str;
        !            28: {
        !            29:        struct tm then;
        !            30:        char dbuf[30];
        !            31:        time_t emitl();
        !            32: 
        !            33:        if (strlen(str) != 25)
        !            34:                str[25] = 0;
        !            35:        strcpy(dbuf, str);
        !            36:        dbuf[E_MONTH+3] = 0;
        !            37:        if ( (then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) {
        !            38:                return(-1);;
        !            39:        }
        !            40:        then.tm_mday = atoi(&dbuf[E_DAY]);
        !            41:        then.tm_hour = atoi(&dbuf[E_HOUR]);
        !            42:        then.tm_min = atoi(&dbuf[E_MINUTE]);
        !            43:        then.tm_sec = atoi(&dbuf[E_SECOND]);
        !            44:        then.tm_year = atoi(&dbuf[E_YEAR]) - 1900;
        !            45:        return(emitl(&then));
        !            46: }
        !            47: 
        !            48: static char months[] =
        !            49:        "JanFebMarAprMayJunJulAugSepOctNovDec";
        !            50: 
        !            51: static
        !            52: lookup(str)
        !            53:        char *str;
        !            54: {
        !            55:        register char *cp, *cp2;
        !            56: 
        !            57:        for (cp = months, cp2 = str; *cp != 0; cp += 3)
        !            58:                if (strncmp(cp, cp2, 3) == 0)
        !            59:                        return((cp-months) / 3);
        !            60:        return(-1);
        !            61: }
        !            62: /*
        !            63:  * Routine to convert a localtime(3) format date back into
        !            64:  * a system format date.
        !            65:  *
        !            66:  *     Use a binary search.
        !            67:  */
        !            68: 
        !            69: struct tm *localtime();
        !            70: 
        !            71: time_t emitl(dp)
        !            72:        struct tm *dp;
        !            73: {
        !            74:        time_t conv;
        !            75:        register int i, bit;
        !            76:        struct tm dcopy;
        !            77: 
        !            78:        dcopy = *dp;
        !            79:        dp = &dcopy;
        !            80:        conv = 0;
        !            81:        for (i = 30; i >= 0; i--) {
        !            82:                bit = 1 << i;
        !            83:                conv |= bit;
        !            84:                if (dcmp(localtime(&conv), dp) > 0)
        !            85:                        conv &= ~bit;
        !            86:        }
        !            87:        return(conv);
        !            88: }
        !            89: 
        !            90: /*
        !            91:  * Compare two localtime dates, return result.
        !            92:  */
        !            93: 
        !            94: #define DECIDE(a) \
        !            95:        if (dp->a > dp2->a) \
        !            96:                return(1); \
        !            97:        if (dp->a < dp2->a) \
        !            98:                return(-1)
        !            99: 
        !           100: static
        !           101: dcmp(dp, dp2)
        !           102:        register struct tm *dp, *dp2;
        !           103: {
        !           104: 
        !           105:        DECIDE(tm_year);
        !           106:        DECIDE(tm_mon);
        !           107:        DECIDE(tm_mday);
        !           108:        DECIDE(tm_hour);
        !           109:        DECIDE(tm_min);
        !           110:        DECIDE(tm_sec);
        !           111:        return(0);
        !           112: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.