.po 1i
.TH SWAP 3 Zilog
.V 08/15/84 17:28:32
.\" @[$]swap.3	1.4	08/15/84 17:28:33 - Zilog Inc.
.ad
.fi
.SH NAME
swap \- swap routines - swap
.br
longswap \- swap routines - swap
.br
swapsegt \- swap routines - swap
.SH SYNOPSIS
.B #include <a.out.h>
.br
.PP
.B int
.I val;
.br
.I val
.B =
.B swap
.I (val);
.br
.PP
.B long
.I val;
.br
.B longswap
.I (&val);
.br
.PP
.B struct
.I segt s_segt;
.br
.B swapsegt
.I (&s_segt);
.br
.SH DESCRIPTION
.B Swap
is used as a function to swap both bytes of an integer
.I val.
.PP
.B Longswap
is given the address of a long value
.I (val)
and swaps both of its words.
.PP
.B Swapsegt
is given the address to a segment table entry
.I (s_segt)
and swaps its word values.
A segment table entry has the following structure:

	struct segt {
.br
		char sg_segno;	/* segment number */
.br
		char sg_coff;	/* offset/256 for code section */
.br
		char sg_doff;	/* offset/256 for data section */
.br
		char sg_boff;	/* offset/256 for bss section */
.br
		unsigned sg_code;	/* size of the code portion */
.br
		unsigned sg_data;	/* size of the data portion */
.br
		unsigned sg_bss;	/* size of the bss portion */
.br
		int sg_atr;	/* attributes */
.br
		long sg_unused;	/* unused */
.br
	}
.br
.PP
These routines are generally used in conjunction with
.I swap_flg
in order to determine whether bytes must be swapped for the
PDP11.
.SH SEE ALSO
a.out(5),
goodmagic(3).