#include <stdio.h> #include <string.h> #include "config.h" /** * endian - endian conversion macros for simple types * * Portable protocols (such as on-disk formats, or network protocols) * are often defined to be a particular endian: little-endian (least * significant bytes first) or big-endian (most significant bytes * first). * * Similarly, some CPUs lay out values in memory in little-endian * order (most commonly, Intel's 8086 and derivatives), or big-endian * order (almost everyone else). * * This module provides conversion routines, inspired by the linux kernel. * * Example: * #include <stdio.h> * #include <err.h> * #include <ccan/endian/endian.h> * * // * int main(int argc, char *argv[]) * { * uint32_t value; * * if (argc != 2) * errx(1, "Usage: %s <value>", argv[0]); * * value = atoi(argv[1]); * printf("native: %08x\n", value); * printf("little-endian: %08x\n", cpu_to_le32(value)); * printf("big-endian: %08x\n", cpu_to_be32(value)); * printf("byte-reversed: %08x\n", bswap_32(value)); * exit(0); * } * * License: LGPL (v2.1 or any later version) * Author: Rusty Russell <rusty@rustcorp.com.au> */ int main(int argc, char *argv[]) { if (argc != 2) return 1; if (strcmp(argv[1], "depends") == 0) /* Nothing */ return 0; return 1; }