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 | */ |
10 | void **__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(n: nr, size: 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 | } |
33 | EXPORT_SYMBOL_GPL(__memcat_p); |
34 | |
35 | |