1/* SPDX-License-Identifier:	GPL-2.0+ BSD-2-Clause */
2#include "fdt_host.h"
3#include "../../scripts/dtc/libfdt/fdt_rw.c"
4
5int fdt_remove_unused_strings(const void *old, void *new)
6{
7	const struct fdt_property *old_prop;
8	struct fdt_property *new_prop;
9	int size = fdt_totalsize(old);
10	int next_offset, offset;
11	const char *str;
12	int ret;
13	int tag = FDT_PROP;
14	int allocated;
15
16	/* Make a copy and remove the strings */
17	memcpy(new, old, size);
18	fdt_set_size_dt_strings(new, 0);
19
20	/* Add every property name back into the new string table */
21	for (offset = 0; tag != FDT_END; offset = next_offset) {
22		tag = fdt_next_tag(old, offset, &next_offset);
23		if (tag != FDT_PROP)
24			continue;
25		old_prop = fdt_get_property_by_offset(old, offset, NULL);
26		new_prop = (struct fdt_property *)(unsigned long)
27			fdt_get_property_by_offset(new, offset, NULL);
28		str = fdt_string(old, fdt32_to_cpu(old_prop->nameoff));
29		ret = fdt_find_add_string_(new, str, &allocated);
30		if (ret < 0)
31			return ret;
32		new_prop->nameoff = cpu_to_fdt32(ret);
33	}
34
35	return 0;
36}
37