gmtime.c

来自「qnx powerpc MPC8245的 BSP源文件」· C语言 代码 · 共 54 行

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software except in  
 * compliance with the License. You may obtain a copy of the License  
 * at: http://www.apache.org/licenses/LICENSE-2.0  
 *  
 * Unless required by applicable law or agreed to in writing, software  
 * distributed under the License is distributed on an "AS IS" basis,  
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $ 
 */

#include <time.h>

struct tm *
_gmtime(const time_t *timer, struct tm *tmbuf) {
	unsigned long	t, days, secs, year, mon;
	static unsigned char	mdays [2][12] = {
		{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
		{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} };
	
	days = *timer / (60L*60L*24L);
	secs = *timer % (60L*60L*24L);
	tmbuf->tm_wday = (days + 4) % 7;
	for (year = 0; ; year++) {
		t = 365 + (((year + 2) % 4) == 0);
		if (t > days) break;
		days -= t;
	}
	tmbuf->tm_yday = days;
	for (mon = 0; mon < 12; mon++) {
		t = mdays [((year + 2) % 4) == 0][mon];
		if (t > days) break;
		days -= t;
	}
	tmbuf->tm_sec  = secs % 60;
	tmbuf->tm_min  = (secs / 60) % 60;
	tmbuf->tm_hour = secs / 60 / 60;
	tmbuf->tm_mday = days + 1;
	tmbuf->tm_mon  = mon;
	tmbuf->tm_year = year + 70;
	return tmbuf;
}