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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcurses/base/lib_scroll.c	Lines:	0	29	0.0 %
Date:	2017-11-07	Branches:	0	38	0.0 %


/* $OpenBSD: lib_scroll.c,v 1.4 2010/01/12 23:22:06 nicm Exp $ */

/****************************************************************************
 * Copyright (c) 1998-2004,2006 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Thomas E. Dickey 1996-2003                                      *
 *     and: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
**	lib_scroll.c
**
**	The routine wscrl(win, n).
**  positive n scroll the window up (ie. move lines down)
**  negative n scroll the window down (ie. move lines up)
**
*/

#include <curses.priv.h>

MODULE_ID("$Id: lib_scroll.c,v 1.4 2010/01/12 23:22:06 nicm Exp $")

NCURSES_EXPORT(void)
_nc_scroll_window(WINDOW *win,
		  int const n,
		  NCURSES_SIZE_T const top,
		  NCURSES_SIZE_T const bottom,
		  NCURSES_CH_T blank)
{
    int limit;
    int line;
    int j;
    size_t to_copy = (size_t) (sizeof(NCURSES_CH_T) * (win->_maxx + 1));

    TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %ld, %ld)",
		    win, n, (long) top, (long) bottom));

    if (top < 0
	|| bottom < top
	|| bottom > win->_maxy) {
	TR(TRACE_MOVE, ("nothing to scroll"));
	return;
    }

    /*
     * This used to do a line-text pointer-shuffle instead of text copies.
     * That (a) doesn't work when the window is derived and doesn't have
     * its own storage, (b) doesn't save you a lot on modern machines
     * anyway.  Your typical memcpy implementations are coded in
     * assembler using a tight BLT loop; for the size of copies we're
     * talking here, the total execution time is dominated by the one-time
     * setup cost.  So there is no point in trying to be excessively
     * clever -- esr.
     */

    /* shift n lines downwards */
    if (n < 0) {
	limit = top - n;
	for (line = bottom; line >= limit && line >= 0; line--) {
	    TR(TRACE_MOVE, ("...copying %d to %d", line + n, line));
	    memcpy(win->_line[line].text,
		   win->_line[line + n].text,
		   to_copy);
	    if_USE_SCROLL_HINTS(win->_line[line].oldindex =
				win->_line[line + n].oldindex);
	}
	for (line = top; line < limit && line <= win->_maxy; line++) {
	    TR(TRACE_MOVE, ("...filling %d", line));
	    for (j = 0; j <= win->_maxx; j++)
		win->_line[line].text[j] = blank;
	    if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX);
	}
    }

    /* shift n lines upwards */
    if (n > 0) {
	limit = bottom - n;
	for (line = top; line <= limit && line <= win->_maxy; line++) {
	    memcpy(win->_line[line].text,
		   win->_line[line + n].text,
		   to_copy);
	    if_USE_SCROLL_HINTS(win->_line[line].oldindex =
				win->_line[line + n].oldindex);
	}
	for (line = bottom; line > limit && line >= 0; line--) {
	    for (j = 0; j <= win->_maxx; j++)
		win->_line[line].text[j] = blank;
	    if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX);
	}
    }
    touchline(win, top, bottom - top + 1);

    if_WIDEC({
	if (WINDOW_EXT(win, addch_used) != 0) {
	    int next = WINDOW_EXT(win, addch_y) + n;
	    if (next < 0 || next > win->_maxy) {
		TR(TRACE_VIRTPUT,
		   ("Alert discarded multibyte on scroll"));
		WINDOW_EXT(win, addch_y) = 0;
	    } else {
		TR(TRACE_VIRTPUT, ("scrolled working position to %d,%d",
				   WINDOW_EXT(win, addch_y),
				   WINDOW_EXT(win, addch_x)));
		WINDOW_EXT(win, addch_y) = next;
	    }
	}
    })
}

NCURSES_EXPORT(int)
wscrl(WINDOW *win, int n)
{
    T((T_CALLED("wscrl(%p,%d)"), win, n));

    if (!win || !win->_scroll) {
	TR(TRACE_MOVE, ("...scrollok is false"));
	returnCode(ERR);
    }

    if (n != 0) {
	_nc_scroll_window(win, n, win->_regtop, win->_regbottom, win->_nc_bkgd);
	_nc_synchook(win);
    }
    returnCode(OK);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: lib_scroll.c,v 1.4 2010/01/12 23:22:06 nicm Exp $ */
2
3			/****************************************************************************
4			* Copyright (c) 1998-2004,2006 Free Software Foundation, Inc. *
5			* *
6			* Permission is hereby granted, free of charge, to any person obtaining a *
7			* copy of this software and associated documentation files (the *
8			* "Software"), to deal in the Software without restriction, including *
9			* without limitation the rights to use, copy, modify, merge, publish, *
10			* distribute, distribute with modifications, sublicense, and/or sell *
11			* copies of the Software, and to permit persons to whom the Software is *
12			* furnished to do so, subject to the following conditions: *
13			* *
14			* The above copyright notice and this permission notice shall be included *
15			* in all copies or substantial portions of the Software. *
16			* *
17			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18			* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20			* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21			* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22			* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23			* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24			* *
25			* Except as contained in this notice, the name(s) of the above copyright *
26			* holders shall not be used in advertising or otherwise to promote the *
27			* sale, use or other dealings in this Software without prior written *
28			* authorization. *
29			****************************************************************************/
30
31			/****************************************************************************
32			* Author: Thomas E. Dickey 1996-2003 *
33			* and: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
34			* and: Eric S. Raymond <esr@snark.thyrsus.com> *
35			****************************************************************************/
36
37			/*
38			** lib_scroll.c
39			**
40			** The routine wscrl(win, n).
41			** positive n scroll the window up (ie. move lines down)
42			** negative n scroll the window down (ie. move lines up)
43			**
44			*/
45
46			#include <curses.priv.h>
47
48			MODULE_ID("$Id: lib_scroll.c,v 1.4 2010/01/12 23:22:06 nicm Exp $")
49
50			NCURSES_EXPORT(void)
51			_nc_scroll_window(WINDOW *win,
52			int const n,
53			NCURSES_SIZE_T const top,
54			NCURSES_SIZE_T const bottom,
55			NCURSES_CH_T blank)
56			{
57			int limit;
58			int line;
59			int j;
60			size_t to_copy = (size_t) (sizeof(NCURSES_CH_T) * (win->_maxx + 1));
61
62			TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %ld, %ld)",
63			win, n, (long) top, (long) bottom));
64
65			if (top < 0
66			\|\| bottom < top
67			\|\| bottom > win->_maxy) {
68			TR(TRACE_MOVE, ("nothing to scroll"));
69			return;
70			}
71
72			/*
73			* This used to do a line-text pointer-shuffle instead of text copies.
74			* That (a) doesn't work when the window is derived and doesn't have
75			* its own storage, (b) doesn't save you a lot on modern machines
76			* anyway. Your typical memcpy implementations are coded in
77			* assembler using a tight BLT loop; for the size of copies we're
78			* talking here, the total execution time is dominated by the one-time
79			* setup cost. So there is no point in trying to be excessively
80			* clever -- esr.
81			*/
82
83			/* shift n lines downwards */
84			if (n < 0) {
85			limit = top - n;
86			for (line = bottom; line >= limit && line >= 0; line--) {
87			TR(TRACE_MOVE, ("...copying %d to %d", line + n, line));
88			memcpy(win->_line[line].text,
89			win->_line[line + n].text,
90			to_copy);
91			if_USE_SCROLL_HINTS(win->_line[line].oldindex =
92			win->_line[line + n].oldindex);
93			}
94			for (line = top; line < limit && line <= win->_maxy; line++) {
95			TR(TRACE_MOVE, ("...filling %d", line));
96			for (j = 0; j <= win->_maxx; j++)
97			win->_line[line].text[j] = blank;
98			if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX);
99			}
100			}
101
102			/* shift n lines upwards */
103			if (n > 0) {
104			limit = bottom - n;
105			for (line = top; line <= limit && line <= win->_maxy; line++) {
106			memcpy(win->_line[line].text,
107			win->_line[line + n].text,
108			to_copy);
109			if_USE_SCROLL_HINTS(win->_line[line].oldindex =
110			win->_line[line + n].oldindex);
111			}
112			for (line = bottom; line > limit && line >= 0; line--) {
113			for (j = 0; j <= win->_maxx; j++)
114			win->_line[line].text[j] = blank;
115			if_USE_SCROLL_HINTS(win->_line[line].oldindex = _NEWINDEX);
116			}
117			}
118			touchline(win, top, bottom - top + 1);
119
120			if_WIDEC({
121			if (WINDOW_EXT(win, addch_used) != 0) {
122			int next = WINDOW_EXT(win, addch_y) + n;
123			if (next < 0 \|\| next > win->_maxy) {
124			TR(TRACE_VIRTPUT,
125			("Alert discarded multibyte on scroll"));
126			WINDOW_EXT(win, addch_y) = 0;
127			} else {
128			TR(TRACE_VIRTPUT, ("scrolled working position to %d,%d",
129			WINDOW_EXT(win, addch_y),
130			WINDOW_EXT(win, addch_x)));
131			WINDOW_EXT(win, addch_y) = next;
132			}
133			}
134			})
135			}
136
137			NCURSES_EXPORT(int)
138			wscrl(WINDOW *win, int n)
139			{
140			T((T_CALLED("wscrl(%p,%d)"), win, n));
141
142			if (!win \|\| !win->_scroll) {
143			TR(TRACE_MOVE, ("...scrollok is false"));
144			returnCode(ERR);
145			}
146
147			if (n != 0) {
148			_nc_scroll_window(win, n, win->_regtop, win->_regbottom, win->_nc_bkgd);
149			_nc_synchook(win);
150			}
151			returnCode(OK);
152			}