2.9BSD/usr/man/cat3/swab.3

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SWAB(3)             UNIX Programmer's Manual              SWAB(3)

NAME
     swab - swap bytes

SYNOPSIS
     swab(from, to, nbytes)
     short *from, *to;

DESCRIPTION
     _S_w_a_b copies _n_b_y_t_e_s bytes pointed to by _f_r_o_m to the position
     pointed to by _t_o, exchanging adjacent even and odd bytes.
     It is useful for carrying binary data between PDP-11s and
     other machines.  _N_b_y_t_e_s should be even.

Printed 6/4/83                                                  1