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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | EXAMPLES | SEE ALSO | COLOPHON |
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BSWAP(3) Linux Programmer's Manual BSWAP(3)
bswap_16, bswap_32, bswap_64 - reverse order of bytes
#include <byteswap.h>
uint16_t bswap_16(uint16_t x);
uint32_t bswap_32(uint32_t x);
uint64_t bswap_64(uint64_t x);
These functions return a value in which the order of the bytes in
their 2-, 4-, or 8-byte arguments is reversed.
These functions return the value of their argument with the bytes
reversed.
These functions always succeed.
These functions are GNU extensions.
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);
}
byteorder(3), endian(3)
This page is part of release 5.13 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2021-06-20 BSWAP(3)
Pages that refer to this page: byteorder(3), endian(3)
Copyright and license for this manual page
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