/*
* Move the cursor to the first column of the n-th previous line.
*/
void
CursorPrevLine(TScreen *screen, int count)
{
CursorUp(screen, count < 1 ? 1 : count);
CarriageReturn(screen);
do_xevents();
}
/*
* moves the cursor left n, no wrap around
*/
void
CursorBack(XtermWidget xw, int n)
{
#define WRAP_MASK (REVERSEWRAP | WRAPAROUND)
TScreen *screen = TScreenOf(xw);
int offset, in_row, length, rev;
int left = ScrnLeftMargin(xw);
int before = screen->cur_col;
if ((rev = (xw->flags & WRAP_MASK) == WRAP_MASK) != 0
&& screen->do_wrap) {
n--;
}
/* if the cursor is already before the left-margin, we have to let it go */
if (before < left)
left = 0;
if ((screen->cur_col -= n) < left) {
if (rev) {
in_row = ScrnRightMargin(xw) - left + 1;
offset = (in_row * screen->cur_row) + screen->cur_col - left;
if (offset < 0) {
length = in_row * MaxRows(screen);
offset += ((-offset) / length + 1) * length;
}
set_cur_row(screen, (offset / in_row));
set_cur_col(screen, (offset % in_row) + left);
do_xevents();
} else {
set_cur_col(screen, left);
}
}
ResetWrap(screen);
}
/*
* Move the cursor to the first column of the n-th next line.
*/
void
CursorNextLine(TScreen *screen, int count)
{
CursorDown(screen, count < 1 ? 1 : count);
CarriageReturn(screen);
do_xevents();
}
/*
* Move the cursor to the first column of the n-th previous line.
*/
void
CursorPrevLine(XtermWidget xw, int count)
{
TScreen *screen = TScreenOf(xw);
CursorUp(screen, count < 1 ? 1 : count);
CarriageReturn(xw);
do_xevents();
}
/*
* Moves Cursor To First Column In Line
* (Note: xterm doesn't implement SLH, SLL which would affect use of this)
*/
void
CarriageReturn(XtermWidget xw)
{
TScreen *screen = TScreenOf(xw);
int left = ScrnLeftMargin(xw);
int col;
if (xw->flags & ORIGIN) {
col = left;
} else if (screen->cur_col >= left) {
col = left;
} else {
/*
* If origin-mode is not active, it is possible to use cursor
* addressing outside the margins. In that case we will go to the
* first column rather than following the margin.
*/
col = 0;
}
set_cur_col(screen, col);
ResetWrap(screen);
do_xevents();
}
