1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * generic arrays
4 */
5
6#include <linux/slab.h>
7#include <sound/core.h>
8#include <sound/hdaudio.h>
9
10/**
11 * snd_array_new - get a new element from the given array
12 * @array: the array object
13 *
14 * Get a new element from the given array. If it exceeds the
15 * pre-allocated array size, re-allocate the array.
16 *
17 * Returns NULL if allocation failed.
18 */
19void *snd_array_new(struct snd_array *array)
20{
21 if (snd_BUG_ON(!array->elem_size))
22 return NULL;
23 if (array->used >= array->alloced) {
24 int num = array->alloced + array->alloc_align;
25 int oldsize = array->alloced * array->elem_size;
26 int size = (num + 1) * array->elem_size;
27 void *nlist;
28 if (snd_BUG_ON(num >= 4096))
29 return NULL;
30 nlist = krealloc(array->list, size, GFP_KERNEL);
31 if (!nlist)
32 return NULL;
33 memset(s: nlist + oldsize, c: 0, n: size - oldsize);
34 array->list = nlist;
35 array->alloced = num;
36 }
37 return snd_array_elem(array, idx: array->used++);
38}
39EXPORT_SYMBOL_GPL(snd_array_new);
40
41/**
42 * snd_array_free - free the given array elements
43 * @array: the array object
44 */
45void snd_array_free(struct snd_array *array)
46{
47 kfree(objp: array->list);
48 array->used = 0;
49 array->alloced = 0;
50 array->list = NULL;
51}
52EXPORT_SYMBOL_GPL(snd_array_free);
53