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cutils.c
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1 /*
2  * various simple utilities for libavformat
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg 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 GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "avformat.h"
24 #include "internal.h"
25 
26 #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))
27 #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)
28 
29 /* This is our own gmtime_r. It differs from its POSIX counterpart in a
30  couple of places, though. */
31 struct tm *ff_brktimegm(time_t secs, struct tm *tm)
32 {
33  tm = gmtime_r(&secs, tm);
34 
35  tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
36  tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */
37 
38  return tm;
39 }