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: }
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