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/* $OpenBSD: ctime.c,v 1.6 2018/05/23 16:23:48 cheloha Exp $ */
/*
* Copyright (c) 1998 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/time.h>
#include "stand.h"
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
char *
ctime(const time_t *clock)
{
static const char wdays[][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char months[][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const u_int monthcnt[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static char buf[64];
int ss, mm, hh, wday, month, year;
time_t tt = *clock;
ss = tt % 60;
tt /= 60; /* minutes */
mm = tt % 60;
tt /= 60; /* hours */
hh = tt % 24;
tt /= 24; /* days */
wday = (4 + tt) % 7; /* weekday, 'twas thursday when time started */
for (year = 1970; tt >= 365; year++)
tt -= isleap(year)? 366: 365;
tt++; /* days are 1-based */
for (month = 0; tt > monthcnt[month]; month++)
tt -= monthcnt[month];
if (month > 2 && isleap(year))
tt--;
snprintf(buf, sizeof buf, "%s %s%3d %02d:%02d:%02d %d\n",
((wday < 0 || wday >= 7)? "???": wdays[wday]),
((month < 0 || month >= 12)? "???": months[month]),
(int)tt, hh, mm, ss, year);
return buf;
}
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