Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 /* add one element to a dynamic array */
27 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem)
28 {
29  /* see similar avconv.c:grow_array() */
30  int nb, nb_alloc;
31  intptr_t *tab;
32 
33  nb = *nb_ptr;
34  tab = *tab_ptr;
35  if ((nb & (nb - 1)) == 0) {
36  if (nb == 0)
37  nb_alloc = 1;
38  else
39  nb_alloc = nb * 2;
40  tab = av_realloc(tab, nb_alloc * sizeof(intptr_t));
41  *tab_ptr = tab;
42  }
43  tab[nb++] = elem;
44  *nb_ptr = nb;
45 }
46 
47 #define ISLEAP(y) (((y) % 4 == 0) && (((y) % 100) != 0 || ((y) % 400) == 0))
48 #define LEAPS_COUNT(y) ((y)/4 - (y)/100 + (y)/400)
49 
50 /* This is our own gmtime_r. It differs from its POSIX counterpart in a
51  couple of places, though. */
52 struct tm *ff_brktimegm(time_t secs, struct tm *tm)
53 {
54  tm = gmtime_r(&secs, tm);
55 
56  tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
57  tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */
58 
59  return tm;
60 }
static struct tm * gmtime_r(const time_t *clock, struct tm *result)
Definition: time_internal.h:26
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:52
void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem)
Definition: cutils.c:27
Main libavformat public API header.
void * av_realloc(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:117
static const struct twinvq_data tab