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usr / src / contrib / ncurses / ncurses / base /

📁 ..
📄 MKkeyname.awk(6.48 KB)
📄 MKlib_gen.sh(13.34 KB)
📄 MKunctrl.awk(5.76 KB)
📄 README(2.52 KB)
📄 define_key.c(3.73 KB)
📄 key_defined.c(3.61 KB)
📄 keybound.c(3.17 KB)
📄 keyok.c(4.03 KB)
📄 legacy_coding.c(3.01 KB)
📄 lib_addch.c(15.66 KB)
📄 lib_addstr.c(7.21 KB)
📄 lib_beep.c(3.54 KB)
📄 lib_bkgd.c(6.98 KB)
📄 lib_box.c(5.24 KB)
📄 lib_chgat.c(3.42 KB)
📄 lib_clear.c(2.77 KB)
📄 lib_clearok.c(2.78 KB)
📄 lib_clrbot.c(3.28 KB)
📄 lib_clreol.c(3.5 KB)
📄 lib_color.c(28.66 KB)
📄 lib_colorset.c(3.12 KB)
📄 lib_delch.c(3.1 KB)
📄 lib_delwin.c(3.61 KB)
📄 lib_dft_fgbg.c(4.27 KB)
📄 lib_driver.c(4.88 KB)
📄 lib_echo.c(3.37 KB)
📄 lib_endwin.c(3.42 KB)
📄 lib_erase.c(3.64 KB)
📄 lib_flash.c(3.53 KB)
📄 lib_freeall.c(5.58 KB)
📄 lib_getch.c(18.86 KB)
📄 lib_getstr.c(6.7 KB)
📄 lib_hline.c(3.55 KB)
📄 lib_immedok.c(2.75 KB)
📄 lib_inchstr.c(3.16 KB)
📄 lib_initscr.c(4.18 KB)
📄 lib_insch.c(5.2 KB)
📄 lib_insdel.c(3 KB)
📄 lib_insnstr.c(3.85 KB)
📄 lib_instr.c(4.2 KB)
📄 lib_isendwin.c(3.01 KB)
📄 lib_leaveok.c(2.78 KB)
📄 lib_mouse.c(52.49 KB)
📄 lib_move.c(2.97 KB)
📄 lib_mvwin.c(4.87 KB)
📄 lib_newterm.c(10.81 KB)
📄 lib_newwin.c(10.96 KB)
📄 lib_nl.c(3.53 KB)
📄 lib_overlay.c(6.42 KB)
📄 lib_pad.c(10.73 KB)
📄 lib_printw.c(4.91 KB)
📄 lib_redrawln.c(3.52 KB)
📄 lib_refresh.c(9.38 KB)
📄 lib_restart.c(4.4 KB)
📄 lib_scanw.c(4.05 KB)
📄 lib_screen.c(24.15 KB)
📄 lib_scroll.c(5.8 KB)
📄 lib_scrollok.c(2.78 KB)
📄 lib_scrreg.c(2.96 KB)
📄 lib_set_term.c(21.57 KB)
📄 lib_slk.c(7.85 KB)
📄 lib_slkatr_set.c(3.58 KB)
📄 lib_slkatrof.c(3.28 KB)
📄 lib_slkatron.c(3.29 KB)
📄 lib_slkatrset.c(3.05 KB)
📄 lib_slkattr.c(3.09 KB)
📄 lib_slkclear.c(3.52 KB)
📄 lib_slkcolor.c(3.66 KB)
📄 lib_slkinit.c(3.63 KB)
📄 lib_slklab.c(3.17 KB)
📄 lib_slkrefr.c(5.66 KB)
📄 lib_slkset.c(5.02 KB)
📄 lib_slktouch.c(3.01 KB)
📄 lib_touch.c(3.77 KB)
📄 lib_ungetch.c(3.58 KB)
📄 lib_vline.c(3.57 KB)
📄 lib_wattroff.c(3.09 KB)
📄 lib_wattron.c(3.1 KB)
📄 lib_winch.c(2.78 KB)
📄 lib_window.c(7.83 KB)
📄 nc_panel.c(2.81 KB)
📄 new_pair.c(9.92 KB)
📄 resizeterm.c(14.29 KB)
📄 safe_sprintf.c(7.86 KB)
📄 sigaction.c(3.62 KB)
📄 tries.c(4.86 KB)
📄 use_window.c(2.79 KB)
📄 version.c(2.59 KB)
📄 vsscanf.c(8.54 KB)
📄 wresize.c(8.41 KB)

Editing: lib_scroll.c

/****************************************************************************
 * Copyright 2019,2020 Thomas E. Dickey                                     *
 * Copyright 1998-2010,2011 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 1.32 2020/02/02 23:34:34 tom Exp $")

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

TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %ld, %ld)",
		    (void *) 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.
     */
#define BottomLimit(n) ((n) >= 0 && (n) >= top)
#define TopLimit(n)    ((n) <= win->_maxy && (n) <= bottom)

/* shift n lines downwards */
    if (n < 0) {
	limit = top - n;
	for (line = bottom; line >= limit && BottomLimit(line); 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 && TopLimit(line); 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 && TopLimit(line); 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 && BottomLimit(line); 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)"), (void *) 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);
}

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Editing: lib_scroll.c

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