blob: 753afa7865e37f58b79b2c6c48d7fd9a834c598a [file] [log] [blame]
Norman James6a58a272015-10-07 14:34:16 -05001#include <stdio.h>
2#include <string.h>
3#include "config.h"
4
5/**
6 * endian - endian conversion macros for simple types
7 *
8 * Portable protocols (such as on-disk formats, or network protocols)
9 * are often defined to be a particular endian: little-endian (least
10 * significant bytes first) or big-endian (most significant bytes
11 * first).
12 *
13 * Similarly, some CPUs lay out values in memory in little-endian
14 * order (most commonly, Intel's 8086 and derivatives), or big-endian
15 * order (almost everyone else).
16 *
17 * This module provides conversion routines, inspired by the linux kernel.
18 *
19 * Example:
20 * #include <stdio.h>
21 * #include <err.h>
22 * #include <ccan/endian/endian.h>
23 *
24 * //
25 * int main(int argc, char *argv[])
26 * {
27 * uint32_t value;
28 *
29 * if (argc != 2)
30 * errx(1, "Usage: %s <value>", argv[0]);
31 *
32 * value = atoi(argv[1]);
33 * printf("native: %08x\n", value);
34 * printf("little-endian: %08x\n", cpu_to_le32(value));
35 * printf("big-endian: %08x\n", cpu_to_be32(value));
36 * printf("byte-reversed: %08x\n", bswap_32(value));
37 * exit(0);
38 * }
39 *
40 * License: License: CC0 (Public domain)
41 * Author: Rusty Russell <rusty@rustcorp.com.au>
42 */
43int main(int argc, char *argv[])
44{
45 if (argc != 2)
46 return 1;
47
48 if (strcmp(argv[1], "depends") == 0)
49 /* Nothing */
50 return 0;
51
52 return 1;
53}