Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

bswap(3) [v7 man page]

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 reversed. ERRORS
These macros always succeed. CONFORMING TO
These macros are GNU extensions. EXAMPLE
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> ", argv[0]); exit(EXIT_FAILURE); } x = strtoul(argv[1], NULL, 0); printf("0x%" PRIx64 " ==> 0x%" PRIx64 " ", x, bswap_64(x)); exit(EXIT_SUCCESS); } SEE ALSO
byteorder(3), endian(3) COLOPHON
This page is part of release 4.15 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 2017-09-15 BSWAP(3)

Check Out this Related Man Page

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 reversed. ERRORS
These macros always succeed. CONFORMING TO
These macros are GNU extensions. EXAMPLE
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> ", argv[0]); exit(EXIT_FAILURE); } x = strtoul(argv[1], NULL, 0); printf("0x%" PRIx64 " ==> 0x%" PRIx64 " ", x, bswap_64(x)); exit(EXIT_SUCCESS); } SEE ALSO
byteorder(3), endian(3) COLOPHON
This page is part of release 4.15 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 2017-09-15 BSWAP(3)
Man Page

5 More Discussions You Might Find Interesting

1. HP-UX

HP-UX 11 - disk errors

HP-UX moses B.11.00 A 9000/889 Disk showing errors which is part of VG /dev/vg00. Contains /usr, /var, and /opt. Have a spare drive with nothing on it. Can we do a disk to disk copy (dd command), shutdown, and then set the scsi ID so the disk we just created is now seen by the system as... (5 Replies)
Discussion started by: RTM
5 Replies

2. Shell Programming and Scripting

What's wrong my sed?

$ cat file1 gcc-configure-sdk, gcc-configure-cross: Dont recomput libgcc: Remove unpackage unwind.h $ cat file2 fc94926 gcc-configure-sdk, gcc-configure-cross: Dont recomput f7ec6ea libgcc: Remove unpackage unwind.h f800988 balbababababa $ cat ./xx.sh #!/bin/bash while read... (10 Replies)
Discussion started by: yanglei_fage
10 Replies

3. UNIX for Dummies Questions & Answers

How to create LVM snapshots?

Please suggest me how do I create LVM snapshots in linux. Best regards, Vishal (5 Replies)
Discussion started by: admin_db
5 Replies

4. Programming

Byte swap timing

I have noticed the difference in byte swap timing between two Ubuntu systems. The bswap_32 used to work just fine on the old system, but on the new one it lags behind home-grown swap. My code: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <byteswap.h> #include... (4 Replies)
Discussion started by: migurus
4 Replies

5. UNIX for Beginners Questions & Answers

Missing Modules After Compiling Kernel

I'm a little embarrassed after all these years I've never really successfully compiled my own kernel. I used this guide to make the following files: linux-headers-5.1.9_5.1.9-1_amd64.deb linux-image-5.1.9_5.1.9-1_amd64.deb linux-libc-dev_5.1.9-1_amd64.deb When I first booted into this... (4 Replies)
Discussion started by: Azrael
4 Replies