source: trunk/minix/lib/ansi/localtime.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 945 bytes
Line 
1/*
2 * localtime - convert a calendar time into broken down time
3 */
4/* $Header: /cvsup/minix/src/lib/ansi/localtime.c,v 1.1.1.1 2005/04/21 14:56:05 beng Exp $ */
5
6#include <time.h>
7#include "loc_time.h"
8
9/* We must be careful, since an int can't represent all the seconds in a day.
10 * Hence the adjustment of minutes when adding timezone and dst information.
11 * This assumes that both must be expressable in multiples of a minute.
12 * Furthermore, it is assumed that both fit into an integer when expressed as
13 * minutes (this is about 22 days, so this should not cause any problems).
14 */
15struct tm *
16localtime(const time_t *timer)
17{
18 struct tm *timep;
19 unsigned dst;
20
21 _tzset();
22 timep = gmtime(timer); /* tm->tm_isdst == 0 */
23 timep->tm_min -= _timezone / 60;
24 timep->tm_sec -= _timezone % 60;
25 mktime(timep);
26
27 dst = _dstget(timep);
28 if (dst) {
29 timep->tm_min += dst / 60;
30 timep->tm_sec += dst % 60;
31 mktime(timep);
32 }
33 return timep;
34}
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