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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | EXAMPLES | SEE ALSO | COLOPHON |
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bswap(3) Library Functions Manual bswap(3)
bswap_16, bswap_32, bswap_64 - reverse order of bytes
Standard C library (libc, -lc)
#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.
GNU.
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("%#" PRIx64 " ==> %#" PRIx64 "\n", x, bswap_64(x));
exit(EXIT_SUCCESS);
}
byteorder(3), endian(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
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⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-06-15 bswap(3)
Pages that refer to this page: byteorder(3), endian(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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