1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <stdlib.h>
18 #include <time.h>
19 
20 #include "libfdt.h"
21 #include "libufdt_sysdeps.h"
22 
23 #include "util.h"
24 
25 int apply_overlay_files(const char *out_filename, const char *base_filename,
26                         const char *overlay_filename) {
27   int ret = 1;
28   char *base_buf = NULL;
29   char *overlay_buf = NULL;
30   char *merged_buf = NULL;
31 
32   size_t base_len;
33   base_buf = load_file(base_filename, &base_len);
34   if (!base_buf) {
35     fprintf(stderr, "Can not load base file: %s\n", base_filename);
36     goto end;
37   }
38 
39   size_t overlay_len;
40   overlay_buf = load_file(overlay_filename, &overlay_len);
41   if (!overlay_buf) {
42     fprintf(stderr, "Can not load overlay file: %s\n", overlay_filename);
43     goto end;
44   }
45 
46   size_t merged_buf_len = base_len + overlay_len;
47   merged_buf = dto_malloc(merged_buf_len);
48   fdt_open_into(base_buf, merged_buf, merged_buf_len);
49 
50   clock_t start = clock();
51   fdt_overlay_apply(merged_buf, overlay_buf);
52   clock_t end = clock();
53 
54   if (write_fdt_to_file(out_filename, merged_buf) != 0) {
55     fprintf(stderr, "Write file error: %s\n", out_filename);
56     goto end;
57   }
58 
59   // Outputs the used time.
60   double cpu_time_used = ((double)(end - start)) / CLOCKS_PER_SEC;
61   printf(" fdt_apply_overlay: took %.9f secs\n", cpu_time_used);
62   ret = 0;
63 
64 end:
65   if (merged_buf) dto_free(merged_buf);
66   if (overlay_buf) dto_free(overlay_buf);
67   if (base_buf) dto_free(base_buf);
68 
69   return ret;
70 }
71 
72 int main(int argc, char **argv) {
73   if (argc < 4) {
74     fprintf(stderr, "Usage: %s <base_file> <overlay_file> <out_file>\n", argv[0]);
75     return 1;
76   }
77 
78   const char *base_file = argv[1];
79   const char *overlay_file = argv[2];
80   const char *out_file = argv[3];
81   int ret = apply_overlay_files(out_file, base_file, overlay_file);
82 
83   return ret;
84 }
85