/****************************************************************************
- * Copyright (c) 1998,2001,2003 Free Software Foundation, Inc. *
+ * 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 *
#include <curses.priv.h>
-MODULE_ID("$Id: lib_scroll.c,v 1.24 2003/07/26 23:25:26 tom Exp $")
+MODULE_ID("$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, NCURSES_SIZE_T const top,
- NCURSES_SIZE_T const bottom, NCURSES_CH_T blank)
+_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 = (size_t) (sizeof(NCURSES_CH_T) * (win->_maxx + 1));
+ size_t to_copy = (sizeof(NCURSES_CH_T) * (size_t) (win->_maxx + 1));
- TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %d, %d)", win, n, top, bottom));
+ TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %ld, %ld)",
+ (void *) win, n, (long) top, (long) bottom));
if (top < 0
|| bottom < top
* 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 && line >= 0; line--) {
+ 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,
if_USE_SCROLL_HINTS(win->_line[line].oldindex =
win->_line[line + n].oldindex);
}
- for (line = top; line < limit && line <= win->_maxy; line++) {
+ 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;
/* shift n lines upwards */
if (n > 0) {
limit = bottom - n;
- for (line = top; line <= limit && line <= win->_maxy; line++) {
+ 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 && line >= 0; line--) {
+ 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)"), win, n));
+ T((T_CALLED("wscrl(%p,%d)"), (void *) win, n));
if (!win || !win->_scroll) {
TR(TRACE_MOVE, ("...scrollok is false"));