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Annotation of sys/lib/libsa/ctime.c, Revision 1.1.1.1

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: }