AT&T 3B2, PC-NFS, Curses - reverse video with werase()

[dxg at cai.com]

/**********************************************************************
 *
 * I am using PC-NFS Version 3.0 to connect to an AT&T 3B2 running UNIX
 * System V Release 3.2.1.  My environment variable TERM is 'vt100'.
 *
 * I am developing a large application using Curses and have run into
 * a problem.  I have to output a string to a window, in reverse video
 * and then clear this window.  But for some reason when the window
 * is cleared the row that contains the reverse video character(s)
 * and all the rows that follow are cleared (output) in reverse video.
 *
 * This problem occurs when the last character output is in reverse video.
 *
 * The problem does not occur, if the last non-blank character output is
 * not in reverse video.
 *
 * The following source file is a small scale version of the problem.
 *
 * The compile command that I am using is:
 *   cc $*.c -o $* -lm -lcurses
 *
 * Please let me know how I can work around this problem, or what I
 * am doing wrong.
 *
 * Thanks,
 * Constantine "Dean" Grammas
 * Computer Associates International
 * 201 University Avenue
 * Westwood MA, 02090
 * (617) 329-7700 x3314
 *
 */

/*********************
**** TEST ROUTINE ****
**********************/
#include	<curses.h>

/*
* Repaint the the specified window
*/
rep_win( wid )
	WINDOW *wid;
{
	/* just for arguments sake, turn off the reverse video attribute
	 */
	wattroff( wid, A_REVERSE );

	wnoutrefresh( wid );
	touchwin( wid );
	doupdate();
} /* END rep_win */

/*
* Repaint the specified window and wait for a key stroke
*/
get_key( wid )
	WINDOW *wid;
{
	/* just for arguments sake, turn off the reverse video attribute
	 */
	wattroff( wid, A_REVERSE );

	rep_win( wid );
	beep();
	wgetch( wid );
} /* END get_key */

/*
* Clear the specified window and then repaint it
*/
clr_win( wid )
	WINDOW *wid;
{
	/* just for arguments sake, turn off the reverse video attribute
	 */
	wattroff( wid, A_REVERSE );

	werase( wid );
	rep_win( wid );
} /* END clr_win */

main()
{
	WINDOW *wid;

	stdscr = initscr();

	/* output a line of text in reverse video, and wait for a key stroke
	 */
	wattrset( stdscr, A_REVERSE );
	mvwaddstr( stdscr, 10,10, "Press any key." );
	wattroff( stdscr, A_REVERSE );
	wattrset( stdscr, A_NORMAL );
	get_key( stdscr );

	/* clear the window, and wait for a keystroke
	 *
	 * NOTE: this is where the problem occurs.
	 */
	wattrset( stdscr, A_NORMAL );
	clr_win( stdscr );
	get_key( stdscr );
	endwin();
} /* END main */