xref: /illumos-gate/usr/src/lib/libcurses/screen/quick_echo.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 /*LINTLIBRARY*/
41 
42 #include	<sys/types.h>
43 #include	"curses_inc.h"
44 
45 extern	int	outchcount;
46 
47 /*
48  *  These routines short-circuit much of the innards of curses in order to get
49  *  a single character output to the screen quickly! It is used by waddch().
50  */
51 
52 int
_quick_echo(WINDOW * win,chtype ch)53 _quick_echo(WINDOW *win, chtype ch)
54 {
55 	short	y = win->_cury;
56 	short	SPy = y + win->_begy + win->_yoffset;
57 	short	SPx = (win->_curx - 1) + win->_begx;
58 	chtype	rawc = _CHAR(ch), rawattrs = _ATTR(ch);
59 
60 	if ((curscr->_flags & _CANT_BE_IMMED) ||
61 	    (win->_flags & _WINCHANGED) ||
62 	    (win->_clear) || (curscr->_clear) ||
63 	    (_virtscr->_flags & _WINCHANGED) ||
64 	    (SPy > ((LINES + SP->Yabove) - 1)) || (SPx > (COLS - 1)) ||
65 	    (SP->slk && (SP->slk->_changed == TRUE))) {
66 		win->_flags |= _WINCHANGED;
67 		return (wrefresh(win));
68 	}
69 
70 	outchcount = 0;
71 	win->_firstch[y] = _INFINITY;
72 	win->_lastch[y] = -1;
73 	/* If the cursor is not in the right place, put it there! */
74 	if ((SPy != curscr->_cury) || (SPx != curscr->_curx)) {
75 		(void) mvcur(curscr->_cury, curscr->_curx, SPy, SPx);
76 		curscr->_cury = SPy;
77 	}
78 	curscr->_curx = SPx + 1;
79 	_CURHASH[SPy] = _NOHASH;
80 	if (ch != ' ') {
81 		if (SPx > _ENDNS[SPy])
82 			_ENDNS[SPy] = SPx;
83 		if (SPx < _BEGNS[SPy])
84 			_BEGNS[SPy] = SPx;
85 	}
86 	_virtscr->_y[SPy][SPx] = curscr->_y[SPy][SPx] = ch;
87 
88 	if (rawattrs != curscr->_attrs)
89 		_VIDS(rawattrs, curscr->_attrs);
90 
91 	if (SP->phys_irm)
92 		_OFFINSERT();
93 
94 	/* Write it out! */
95 	/* LINTED */
96 	(void) _outch((char) rawc);
97 	(void) fflush(SP->term_file);
98 
99 	return (outchcount);
100 }
101