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1// SPDX-License-Identifier: GPL-2.02 3#include <linux/slab.h>4 5/*6 * Merge two NULL-terminated pointer arrays into a newly allocated7 * array, which is also NULL-terminated. Nomenclature is inspired by8 * 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 35