b2581e143d
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21106 a1c6a512-1295-4272-9138-f99709370657
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <time.h>
|
|
|
|
/* seconds per day */
|
|
#define SPD 24*60*60
|
|
|
|
/* days per month -- nonleap! */
|
|
const short __spm[13] =
|
|
{ 0,
|
|
(31),
|
|
(31+28),
|
|
(31+28+31),
|
|
(31+28+31+30),
|
|
(31+28+31+30+31),
|
|
(31+28+31+30+31+30),
|
|
(31+28+31+30+31+30+31),
|
|
(31+28+31+30+31+30+31+31),
|
|
(31+28+31+30+31+30+31+31+30),
|
|
(31+28+31+30+31+30+31+31+30+31),
|
|
(31+28+31+30+31+30+31+31+30+31+30),
|
|
(31+28+31+30+31+30+31+31+30+31+30+31),
|
|
};
|
|
|
|
int __isleap(int year) {
|
|
/* every fourth year is a leap year except for century years that are
|
|
* not divisible by 400. */
|
|
/* return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
|
|
return (!(year%4) && ((year%100) || !(year%400)));
|
|
}
|
|
|
|
struct tm *gmtime(const time_t *timep) {
|
|
static struct tm r;
|
|
time_t i;
|
|
register time_t work=*timep%(SPD);
|
|
r.tm_sec=work%60; work/=60;
|
|
r.tm_min=work%60; r.tm_hour=work/60;
|
|
work=*timep/(SPD);
|
|
r.tm_wday=(4+work)%7;
|
|
for (i=1970; ; ++i) {
|
|
register time_t k=__isleap(i)?366:365;
|
|
if (work>=k)
|
|
work-=k;
|
|
else
|
|
break;
|
|
}
|
|
r.tm_year=i-1900;
|
|
r.tm_yday=work;
|
|
|
|
r.tm_mday=1;
|
|
if (__isleap(i) && (work>58)) {
|
|
if (work==59) r.tm_mday=2; /* 29.2. */
|
|
work-=1;
|
|
}
|
|
|
|
for (i=11; i && (__spm[i]>work); --i) ;
|
|
r.tm_mon=i;
|
|
r.tm_mday+=work-__spm[i];
|
|
return &r;
|
|
}
|