1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/slab.h>
 4
 5/*
 6 * Merge two NULL-terminated pointer arrays into a newly allocated
 7 * array, which is also NULL-terminated. Nomenclature is inspired by
 8 * memset_p() and memcat() found elsewhere in the kernel source tree.
 9 */
10void **__memcat_p(void **a, void **b)
11{
12	void **p = a, **new;
13	int nr;
14
15	/* count the elements in both arrays */
16	for (nr = 0, p = a; *p; nr++, p++)
17		;
18	for (p = b; *p; nr++, p++)
19		;
20	/* one for the NULL-terminator */
21	nr++;
22
23	new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL);
24	if (!new)
25		return NULL;
26
27	/* nr -> last index; p points to NULL in b[] */
28	for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1)
29		new[nr] = *p;
30
31	return new;
32}
33EXPORT_SYMBOL_GPL(__memcat_p);
34

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/slab.h>
 4
 5/*
 6 * Merge two NULL-terminated pointer arrays into a newly allocated
 7 * array, which is also NULL-terminated. Nomenclature is inspired by
 8 * memset_p() and memcat() found elsewhere in the kernel source tree.
 9 */
10void **__memcat_p(void **a, void **b)
11{
12	void **p = a, **new;
13	int nr;
14
15	/* count the elements in both arrays */
16	for (nr = 0, p = a; *p; nr++, p++)
17		;
18	for (p = b; *p; nr++, p++)
19		;
20	/* one for the NULL-terminator */
21	nr++;
22
23	new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL);
24	if (!new)
25		return NULL;
26
27	/* nr -> last index; p points to NULL in b[] */
28	for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1)
29		new[nr] = *p;
30
31	return new;
32}
33EXPORT_SYMBOL_GPL(__memcat_p);
34