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libretro: implement gettimeofday(). Fixes issue #18

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This commit is contained in:
Wolfgang Thaller 2015-09-16 00:39:03 +02:00
parent 8bd1a20557
commit 9b13d38682
1 changed files with 38 additions and 0 deletions
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38
libretro/syscalls.c
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@ -26,6 +26,8 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <MacMemory.h>
#include <Processes.h>
@ -90,3 +92,39 @@ pid_t getpid(void)
{
return 42;
}
int gettimeofday(struct timeval *tp, void *__tz)
{
/* Classic MacOS's GetDateTime function returns an integer.
* TickCount() has a slightly higher resolution, but is independend of the real-time clock.
*/
unsigned long secs;
GetDateTime(&secs);
unsigned long ticks = TickCount();
static unsigned long savedTicks = 0, savedSecs = 0;
if(!savedSecs)
{
savedTicks = ticks;
savedSecs = secs;
}
else
{
unsigned long elapsedTicks = ticks - savedTicks;
unsigned long elapsedSecs = secs - savedSecs;
unsigned long expectedTicks = elapsedSecs * 60 + elapsedSecs * 3 / 20;
if(expectedTicks > elapsedTicks)
savedTicks = ticks;
else
savedTicks += expectedTicks;
savedSecs = secs;
}
if(tp)
{
tp->tv_sec = secs - 86400 * (365 * 66 + 66/4);
tp->tv_usec = (ticks - savedTicks) * 20000000 / 2003;
}
}