uxn/src/devices/datetime.c

#include <time.h>

#include "../uxn.h"
#include "datetime.h"

/*
Copyright (c) 2021 Devine Lu Linvega
Copyright (c) 2021 Andrew Alderwick

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/

Uint8
datetime_dei(Device *d, Uint8 port)
{
	time_t seconds = time(NULL);
	struct tm zt = {0};
	struct tm *t = localtime(&seconds);
	if(t == NULL)
		t = &zt;
	switch(port) {
	case 0x0: return (t->tm_year + 1900) >> 8;
	case 0x1: return (t->tm_year + 1900);
	case 0x2: return t->tm_mon;
	case 0x3: return t->tm_mday;
	case 0x4: return t->tm_hour;
	case 0x5: return t->tm_min;
	case 0x6: return t->tm_sec;
	case 0x7: return t->tm_wday;
	case 0x8: return t->tm_yday >> 8;
	case 0x9: return t->tm_yday;
	case 0xa: return t->tm_isdst;
	default: return d->dat[port];
	}
}