source: GPL/trunk/alsa-kernel/hda/array.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * generic arrays
 */

#include <linux/slab.h>
#include <sound/core.h>
#include <sound/hdaudio.h>

/**
 * snd_array_new - get a new element from the given array
 * @array: the array object
 *
 * Get a new element from the given array.  If it exceeds the
 * pre-allocated array size, re-allocate the array.
 *
 * Returns NULL if allocation failed.
 */
void *snd_array_new(struct snd_array *array)
{
        if (snd_BUG_ON(!array->elem_size))
                return NULL;
        if (array->used >= array->alloced) {
                int num = array->alloced + array->alloc_align;
                int oldsize = array->alloced * array->elem_size;
                int size = (num + 1) * array->elem_size;
                void *nlist;
                if (snd_BUG_ON(num >= 4096))
                        return NULL;
                nlist = krealloc(array->list, size, GFP_KERNEL);
                if (!nlist)
                        return NULL;
                memset(nlist + oldsize, 0, size - oldsize);
                array->list = nlist;
                array->alloced = num;
        }
        return snd_array_elem(array, array->used++);
}
EXPORT_SYMBOL_GPL(snd_array_new);

/**
 * snd_array_free - free the given array elements
 * @array: the array object
 */
void snd_array_free(struct snd_array *array)
{
        kfree(array->list);
        array->used = 0;
        array->alloced = 0;
        array->list = NULL;
}
EXPORT_SYMBOL_GPL(snd_array_free);