BSWAP(3) Linux Programmer's Manual BSWAP(3)
NAME
bswap_16, bswap_32, bswap_64 - reverse order of bytes
SYNOPSIS
#include <byteswap.h>
bswap_16(x);
bswap_32(x);
bswap_64(x);
DESCRIPTION
These macros return a value in which the order of the bytes in their
2-, 4-, or 8-byte arguments is reversed.
RETURN VALUE
These macros return the value of their argument with the bytes re-
versed.
ERRORS
These macros always succeed.
CONFORMING TO
These macros are GNU extensions.
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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <byteswap.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("%#" PRIx64 " ==> %#" PRIx64 "\n", x, bswap_64(x));
exit(EXIT_SUCCESS);
}
SEE ALSO
byteorder(3), endian(3)
COLOPHON
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Linux 2020-11-01 BSWAP(3)
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