| /* |
| * Various simple utilities for ffmpeg system |
| * Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0)) |
| #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400) |
| |
| /* This is our own gmtime_r. It differs from its POSIX counterpart in a |
| couple of places, though. */ |
| struct tm *brktimegm(time_t secs, struct tm *tm) |
| { |
| int days, y, ny, m; |
| int md[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; |
| |
| days = secs / 86400; |
| secs %= 86400; |
| tm->tm_hour = secs / 3600; |
| tm->tm_min = (secs % 3600) / 60; |
| tm->tm_sec = secs % 60; |
| |
| /* oh well, may be someone some day will invent a formula for this stuff */ |
| y = 1970; /* start "guessing" */ |
| while (days > 365) { |
| ny = (y + days/366); |
| days -= (ny - y) * 365 + LEAPS_COUNT(ny - 1) - LEAPS_COUNT(y - 1); |
| y = ny; |
| } |
| if (days==365 && !ISLEAP(y)) { days=0; y++; } |
| md[1] = ISLEAP(y)?29:28; |
| for (m=0; days >= md[m]; m++) |
| days -= md[m]; |
| |
| tm->tm_year = y; /* unlike gmtime_r we store complete year here */ |
| tm->tm_mon = m+1; /* unlike gmtime_r tm_mon is from 1 to 12 */ |
| tm->tm_mday = days+1; |
| |
| return tm; |
| } |