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   bswap    ( 3 )

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Имя (Name)

bswap_16, bswap_32, bswap_64 - reverse order of bytes

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Синопсис (Synopsis)

#include <byteswap.h>

       uint16_t bswap_16(uint16_t x);
       uint32_t bswap_32(uint32_t x);
       uint64_t bswap_64(uint64_t x);

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Описание (Description)

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

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Возвращаемое значение (Return value)

These functions return the value of their argument with the bytes
       reversed.

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Ошибки (Error)

These functions always succeed.

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Стандарты (Conforming to)

These functions are GNU extensions.

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Примеры (Examples)

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);
       }

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Смотри также (See also)

byteorder(3), endian(3)

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