5 * Copyright (C) 2003, 2007, 2008, 2009 Thomas Perl <thp@thpinfo.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
30 void day_night(unsigned int width
, unsigned int* start
, unsigned int* end
)
32 time_t t
= time(NULL
);
33 unsigned int offset
= 60; /* set this so the day/night fits for London */
35 assert(start
!= NULL
);
38 *start
= (unsigned int)(offset
- (t
/60)*width
/(60*24)) % width
;
39 *end
= (unsigned int)(*start
+ width
/2) % width
;