d2ttime.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 59 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#include <time.h>
#include "d2ttime.h"

/* date extraction macros */
#define day( x )        (x & 0x001f)
#define month( x )      ((x >> 5) & 0x000f)
#define year( x )       ((x >> 9) & 0x007f)
/* time extraction macros */
#define sec2( x )       (x & 0x001f)
#define min( x )        ((x >> 5) & 0x003f)
#define hour( x )       ((x >> 11) & 0x001f)

time_t _d2ttime( unsigned short date, unsigned short time )
{
    struct tm t;

    t.tm_year = year( date ) + 80;
    t.tm_mon  = month( date ) - 1;
    t.tm_mday = day( date );
    t.tm_hour = hour( time );
    t.tm_min  = min( time );
    t.tm_sec  = sec2( time ) * 2;
    t.tm_isdst = -1;
    return( mktime( &t ) );
}