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Fix crashes with windows overlapping right and bottom edges of screen #168

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Fix crashes with windows overlapping right and bottom edges of screen #168

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a2a61a4
Windows extending beyond the right and bottom edges of curscr no long…
Bill-Gray Jul 18, 2024
6ba6df3
Due to preceding commit, windows can be created or moved beyond the …
Bill-Gray Jul 18, 2024
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9 changes: 8 additions & 1 deletion pdcurses/refresh.c
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ int wnoutrefresh(WINDOW *win)
begy = win->_begy;
begx = win->_begx;

for (i = 0, j = begy; i < win->_maxy; i++, j++)
for (i = 0, j = begy; i < win->_maxy && j < curscr->_maxy; i++, j++)
{
if (win->_firstch[i] != _NO_CHANGE)
{
Expand All @@ -88,6 +88,9 @@ int wnoutrefresh(WINDOW *win)
int first = win->_firstch[i]; /* first changed */
int last = win->_lastch[i]; /* last changed */

if( last > curscr->_maxx - begx - 1) /* don't run off right-hand */
last = curscr->_maxx - begx - 1; /* edge of screen */

/* ignore areas on the outside that are marked as changed,
but really aren't */

Expand Down Expand Up @@ -128,6 +131,10 @@ int wnoutrefresh(WINDOW *win)
{
curscr->_cury = win->_cury + begy;
curscr->_curx = win->_curx + begx;
if( win->_cury >= win->_maxy)
win->_cury = win->_maxy - 1;
if( win->_curx >= win->_maxx)
win->_curx = win->_maxx - 1;
}

return OK;
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5 changes: 2 additions & 3 deletions pdcurses/window.c
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Original file line number Diff line number Diff line change
Expand Up @@ -273,7 +273,7 @@ WINDOW *newwin(int nlines, int ncols, int begy, int begx)
if (!ncols)
ncols = COLS - begx;

if (!SP || begy + nlines > SP->lines || begx + ncols > SP->cols)
if (!SP)
return (WINDOW *)NULL;

win = PDC_makenew(nlines, ncols, begy, begx);
Expand Down Expand Up @@ -314,8 +314,7 @@ int mvwin(WINDOW *win, int y, int x)
{
PDC_LOG(("mvwin() - called\n"));

if (!win || (y + win->_maxy > LINES || y < 0)
|| (x + win->_maxx > COLS || x < 0))
if (!win || y < 0 || x < 0)
return ERR;

win->_begy = y;
Expand Down