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BSWAP(3) Linux Programmer's Manual BSWAP(3) NAME bswap_16, bswap_32, bswap_64 - reverse order of bytes 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); DESCRIPTION These functions return a value in which the order of the bytes in their 2-, 4-, or 8-byte arguments is reversed. RETURN VALUE These functions return the value of their argument with the bytes reversed. ERRORS These functions always succeed. CONFORMING TO These functions are GNU extensions. 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); } SEE ALSO byteorder(3), endian(3) Linux 2021-06-20 BSWAP(3)