hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
35 lines
753 B
C
35 lines
753 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/slab.h>
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/*
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* Merge two NULL-terminated pointer arrays into a newly allocated
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* array, which is also NULL-terminated. Nomenclature is inspired by
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* memset_p() and memcat() found elsewhere in the kernel source tree.
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*/
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void **__memcat_p(void **a, void **b)
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{
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void **p = a, **new;
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int nr;
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/* count the elements in both arrays */
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for (nr = 0, p = a; *p; nr++, p++)
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;
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for (p = b; *p; nr++, p++)
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;
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/* one for the NULL-terminator */
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nr++;
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new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL);
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if (!new)
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return NULL;
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/* nr -> last index; p points to NULL in b[] */
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for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1)
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new[nr] = *p;
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return new;
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}
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EXPORT_SYMBOL_GPL(__memcat_p);
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