src/libmach_amd64/swap.c

// Inferno libmach/swap.c
// http://code.google.com/p/inferno-os/source/browse/utils/libmach/swap.c
//
// 	Copyright © 1994-1999 Lucent Technologies Inc.
// 	Power PC support Copyright © 1995-2004 C H Forsyth (forsyth@terzarima.net).
// 	Portions Copyright © 1997-1999 Vita Nuova Limited.
// 	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).
// 	Revisions Copyright © 2000-2004 Lucent Technologies Inc. and others.
//	Portions Copyright © 2009 The Go Authors.  All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include <u.h>

/*
 * big-endian short
 */
ushort
beswab(ushort s)
{
	uchar *p;

	p = (uchar*)&s;
	return (p[0]<<8) | p[1];
}

/*
 * big-endian int32
 */
uint32
beswal(uint32 l)
{
	uchar *p;

	p = (uchar*)&l;
	return (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
}

/*
 * big-endian vlong
 */
uvlong
beswav(uvlong v)
{
	uchar *p;

	p = (uchar*)&v;
	return ((uvlong)p[0]<<56) | ((uvlong)p[1]<<48) | ((uvlong)p[2]<<40)
				  | ((uvlong)p[3]<<32) | ((uvlong)p[4]<<24)
				  | ((uvlong)p[5]<<16) | ((uvlong)p[6]<<8)
				  | (uvlong)p[7];
}

/*
 * little-endian short
 */
ushort
leswab(ushort s)
{
	uchar *p;

	p = (uchar*)&s;
	return (p[1]<<8) | p[0];
}

/*
 * little-endian int32
 */
uint32
leswal(uint32 l)
{
	uchar *p;

	p = (uchar*)&l;
	return (p[3]<<24) | (p[2]<<16) | (p[1]<<8) | p[0];
}

/*
 * little-endian vlong
 */
uvlong
leswav(uvlong v)
{
	uchar *p;

	p = (uchar*)&v;
	return ((uvlong)p[7]<<56) | ((uvlong)p[6]<<48) | ((uvlong)p[5]<<40)
				  | ((uvlong)p[4]<<32) | ((uvlong)p[3]<<24)
				  | ((uvlong)p[2]<<16) | ((uvlong)p[1]<<8)
				  | (uvlong)p[0];
}