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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | EXAMPLES | SEE ALSO | COLOPHON |
BSWAP(3) Linux Programmer's Manual BSWAP(3)
bswap_16, bswap_32, bswap_64 - reverse order of bytes
#include <byteswap.h>
bswap_16(x);
bswap_32(x);
bswap_64(x);
These macros return a value in which the order of the bytes in their
2-, 4-, or 8-byte arguments is reversed.
These macros return the value of their argument with the bytes
reversed.
These macros always succeed.
These macros 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 = strtoul(argv[1], NULL, 0);
printf("0x%" PRIx64 " ==> 0x%" PRIx64 "\n", x, bswap_64(x));
exit(EXIT_SUCCESS);
}
byteorder(3), endian(3)
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Linux 2020-06-09 BSWAP(3)
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