1 /* Copyright 2014 The ChromiumOS Authors
2 * Use of this source code is governed by a BSD-style license that can be
3 * found in the LICENSE file.
4 *
5 * This is a very simple binary editor, used to create corrupted structs for
6 * testing. It copies stdin to stdout, replacing bytes beginning at the given
7 * offset with the specified 8-bit values.
8 *
9 * There is NO conversion checking of the arguments.
10 */
11
12 #include <stdint.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15
main(int argc,char * argv[])16 int main(int argc, char *argv[])
17 {
18 uint32_t offset, curpos, curarg;
19 int c;
20
21 if (argc < 3) {
22 fprintf(stderr, "Need two or more args: OFFSET VAL [VAL...]\n");
23 return 1;
24 }
25
26 offset = (uint32_t)strtoul(argv[1], 0, 0);
27 curarg = 2;
28 for ( curpos = 0; (c = fgetc(stdin)) != EOF; curpos++) {
29
30 if (curpos == offset && curarg < argc) {
31 c = (uint8_t)strtoul(argv[curarg++], 0, 0);
32 offset++;
33 }
34
35 fputc(c, stdout);
36 }
37 return 0;
38 }
39