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Annotation of sys/lib/libsa/ctime.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: ctime.c,v 1.5 2003/08/11 06:23:09 deraadt Exp $       */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1998 Michael Shalayeff
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            18:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            19:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            20:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            21:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            22:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            23:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            24:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            25:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            26:  */
        !            27:
        !            28: #include <sys/time.h>
        !            29: #include "stand.h"
        !            30:
        !            31: #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
        !            32:
        !            33: char *
        !            34: ctime(const time_t *clock)
        !            35: {
        !            36:        static const char wdays[][4] = {
        !            37:                "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
        !            38:        };
        !            39:        static const char months[][4] = {
        !            40:                "Jan", "Feb", "Mar", "Apr", "May", "Jun",
        !            41:                "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
        !            42:        };
        !            43:        static const u_int monthcnt[] = {
        !            44:                31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
        !            45:        };
        !            46:        static char buf[64];
        !            47:        int ss, mm, hh, wday, month, year;
        !            48:        time_t tt = *clock;
        !            49:
        !            50:        ss = tt % 60;
        !            51:        tt /= 60;       /* minutes */
        !            52:        mm = tt % 60;
        !            53:        tt /= 60;       /* hours */
        !            54:        hh = tt % 24;
        !            55:        tt /= 24;       /* days */
        !            56:        wday = (4 + tt) % 7;    /* weekday, 'twas thursday when time started */
        !            57:
        !            58:        for (year = 1970; tt >= 365; year++)
        !            59:                tt -= isleap(year)? 366: 365;
        !            60:
        !            61:        tt++;   /* days are 1-based */
        !            62:
        !            63:        for (month = 0; tt > monthcnt[month]; month++)
        !            64:                tt -= monthcnt[month];
        !            65:
        !            66:        if (month > 2 && isleap(year))
        !            67:                tt--;
        !            68:
        !            69:        /* no field widths in printf() */
        !            70:        snprintf(buf, sizeof buf, "%s %s %d %d:%d:%d %d\n",
        !            71:            ((wday  < 0 || wday  >=  7)? "???": wdays[wday]),
        !            72:            ((month < 0 || month >= 12)? "???": months[month]),
        !            73:            (int)tt, hh, mm, ss, year);
        !            74:        return buf;
        !            75: }