bswap_643
Byte swap
Part of bswap(3).
Usage
#include <byteswap.h>
uint16_t bswap_16(uint16_t x); uint32_t bswap_32(uint32_t x); uint64_t bswap_64(uint64_t x);
Library
Standard C library (libc, -lc)
Overview
These functions return a value in which the order of the bytes in their 2-, 4-, or 8-byte arguments is reversed.
Return value
These functions return the value of their argument with the bytes reversed.
Errors
These functions always succeed.
Examples
The program below swaps the bytes of the 8-byte integer supplied as its command-line argument. The following shell session demonstrates the use of the program:
$ ./a.out 0x0123456789abcdef; 0x123456789abcdef ==> 0xefcdab8967452301
Program source
#include <byteswap.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
uint64_t x;
if (argc != 2) {
fprintf(stderr, "Usage: %s <num>\n", argv[0]);
exit(EXIT_FAILURE);
}
x = strtoull(argv[1], NULL, 0);
printf("%#w64x ==> %#w64x\n", x, bswap_64(x));
exit(EXIT_SUCCESS);
}
Releases
6 releases since Debian 9 (Stretch); the text changed 5 times.