bswap(3) - f36

1BSWAP(3)                   Linux Programmer's Manual                  BSWAP(3)
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NAME

6       bswap_16, bswap_32, bswap_64 - reverse order of bytes
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SYNOPSIS

9       #include <byteswap.h>
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11       uint16_t bswap_16(uint16_t x);
12       uint32_t bswap_32(uint32_t x);
13       uint64_t bswap_64(uint64_t x);
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DESCRIPTION

16       These functions return a value in which the order of the bytes in their
17       2-, 4-, or 8-byte arguments is reversed.
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RETURN VALUE

20       These functions return the value of their argument with the  bytes  re‐
21       versed.
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ERRORS

24       These functions always succeed.
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CONFORMING TO

27       These functions are GNU extensions.
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EXAMPLES

30       The program below swaps the bytes of the 8-byte integer supplied as its
31       command-line argument.  The following shell  session  demonstrates  the
32       use of the program:
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34           $ ./a.out 0x0123456789abcdef
35           0x123456789abcdef ==> 0xefcdab8967452301
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37   Program source
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39       #include <stdio.h>
40       #include <stdint.h>
41       #include <stdlib.h>
42       #include <inttypes.h>
43       #include <byteswap.h>
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45       int
46       main(int argc, char *argv[])
47       {
48           uint64_t x;
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50           if (argc != 2) {
51               fprintf(stderr, "Usage: %s <num>\n", argv[0]);
52               exit(EXIT_FAILURE);
53           }
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55           x = strtoull(argv[1], NULL, 0);
56           printf("%#" PRIx64 " ==> %#" PRIx64 "\n", x, bswap_64(x));
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58           exit(EXIT_SUCCESS);
59       }
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COLOPHON

65       This  page  is  part of release 5.13 of the Linux man-pages project.  A
66       description of the project, information about reporting bugs,  and  the
67       latest     version     of     this    page,    can    be    found    at
68       https://www.kernel.org/doc/man-pages/.
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72Linux                             2021-06-20                          BSWAP(3)