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/* $Header: /var/lib/cvsd/repos/coherent/coherent/d/usr/lib/libcurses/need.c,v 1.1.1.1 2019/05/29 04:56:38 root Exp $
 *
 *	The  information  contained herein  is a trade secret  of INETCO
 *	Systems, and is confidential information.   It is provided under
 *	a license agreement,  and may be copied or disclosed  only under
 *	the terms of that agreement.   Any reproduction or disclosure of
 *	this  material  without  the express  written  authorization  of
 *	INETCO Systems or persuant to the license agreement is unlawful.
 *
 *	Copyright (c) 1989
 *	An unpublished work by INETCO Systems, Ltd.
 *	All rights reserved.
 */

# include	"curses.ext"

#ifdef	COHERENT
/**
 *
 * _need( s )
 * char * s;
 *
 *	Input:	s = string which will eventually be passed to _putchar().
 *
 *	Action:	If output buffering is enabled, and there is insufficient
 *		room in the output buffer for the specified string,
 *		flush the output buffer.
 *
 *	Return:	 0 = atomic output is guaranteed.
 *		-1 = buffering disabled.
 *
 *	Notes:	This attempts to ensure that escape sequences are sent to
 *		the terminal in one atomic operation, without being split
 *		by other terminal output.
 */
int
_need( s )
uchar * s;
{
	reg FILE * fp = stdout;

	/*
	 * Stdout exists, and has a buffer allocated.
	 * _bp = pointer to beginning of buffer.
	 * _cp = pointer to current char in buffer.
	 * Flush stdout if insufficient room for string.
	 */
	if ( (fp != NULL) && (fp->_bp != NULL) && (fp->_cp != NULL) ) {
		if ( ((fp->_cp - fp->_bp) + strlen(s)) >= BUFSIZ )
			fflush( stdout );
		return (0);
	}

	/*
	 * Atomic output by stdio cannot be guaranteed.
	 */
	return (-1);
}
#endif

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