Ultrix-3.1/src/libc/stdio/stdiom.h

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * SCCSID: @(#)stdiom.h	3.0	4/22/86
 */
/*	(System 5)  stdiom.h  1.1  */

/* The following macros improve performance of the stdio by reducing the
	number of calls to _bufsync and _wrtchk.  _BUFSYNC has the same
	effect as _bufsync, and _WRTCHK has the same effect as _wrtchk,
	but often these functions have no effect, and in those cases the
	macros avoid the expense of calling the functions.  */

#define _BUFSYNC(iop)	if (_bufend(iop) - iop->_ptr <   \
				( iop->_cnt < 0 ? 0 : iop->_cnt ) )  \
					_bufsync(iop)
#define _WRTCHK(iop)	((((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) \
				|| (iop->_base == NULL)  \
				|| (iop->_ptr == iop->_base && iop->_cnt == 0 \
					&& !(iop->_flag & (_IONBF | _IOLBF)))) \
			? _wrtchk(iop) : 0 )