/***
*swab.c - block copy, while swapping even/odd bytes
*
*       Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       This module contains the routine _swab() which swaps the odd/even
*       bytes of words during a block copy.
*
*******************************************************************************/

/***
*void _swab(srcptr, dstptr, nbytes) - swap ODD/EVEN bytes during word move
*
*Purpose:
*       This routine copys a block of words and swaps the odd and even
*       bytes.  nbytes must be > 0, otherwise nothing is copied.  If
*       nbytes is odd, then only (nbytes-1) bytes are copied.
*
*Entry:
*       srcptr = pointer to the source block
*       dstptr = pointer to the destination block
*       nbytes = number of bytes to swap
*
*Returns:
*       None.
*
*Exceptions:
*
*******************************************************************************/

void swab(char *src, char *dest, int nbytes)
{
	char b1, b2;

	while(nbytes > 1)
	{
		b1 = *src++;
		b2 = *src++;
		*dest++ = b2;
		*dest++ = b1;
		nbytes -= 2;
	}
}