/*
buildnum.c - build number (actually date) calculator
Copyright (C) 1996-1997  Id Software, Inc.
Copyright (C) 1999,2000  contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include <stdlib.h>
#include <string.h>

#include <quakedef.h>

//char *date = "Dec 21 1999";
//char *time = "00:00:00";
char *date = __DATE__ ;
char *time = __TIME__ ;

char *mon[12] = 
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
char mond[12] = 
{ 31,    28,    31,    30,    31,    30,    31,    31,    30,    31,    30,    31 };

// returns days since Oct 24 1996
int build_number( void )
{
	int m = 0; 
	int d = 0;
	int y = 0;
	int hr, min;
	static int b = 0;

	if (b != 0)
		return b;

	for (m = 0; m < 11; m++)
	{
		if (_strnicmp( &date[0], mon[m], 3 ) == 0)
			break;
		d += mond[m];
	}

	d += atoi( &date[4] ) - 1;

	y = atoi( &date[7] ) - 1900;

	b = d + (int)((y - 1) * 365.25);

	if (((y % 4) == 0) && m > 1)
	{
		b += 1;
	}

	b -= 36148; // Dec 21 1999

	hr = (time[0] - '0') * 10 + (time[1] - '0');
	min = (time[3] - '0') * 10 + (time[4] - '0');
//	sec = (time[6] - '0') * 10 + (time[7] - '0');

	b *= 60*24;
	b += hr * 60 + min;

	return b;
}
