NAME

swab − swap bytes

SYNOPSIS

void swab (from, to, nbytes)
char ∗from, ∗to;
int nbytes;

DESCRIPTION

swab copies nbytes bytes pointed to by from to the array pointed to by to, exchanging adjacent even and odd bytes. Nbytes should be even and non-negative.  If nbytes is odd and positive swab uses nbytes−1 instead. If nbytes is negative, swab does nothing. 

CX/UX Programmer’s Reference Manual