SWAB(3) BSD Programmer's Manual SWAB(3)
swab - swap adjacent bytes
#include <unistd.h> void swab(const void *src, void *dst, size_t len);
The function swab() copies len bytes from the location referenced by src to the location referenced by dst, swapping adjacent bytes. The argument len must be an even number.
bzero(3), memset(3)
A swab() function appeared in Version 7 AT&T UNIX. MirBSD #10-current May 1, 1991 1