/* Non-locking version of cons_vcons_scrollback. Does also not update
the display. */
int
_cons_vcons_scrollback (vcons_t vcons, cons_scroll_t type, float value)
{
int scrolling;
uint32_t new_scr;
switch (type)
{
case CONS_SCROLL_DELTA_LINES:
scrolling = vcons->scrolling + ((uint32_t) value);
break;
case CONS_SCROLL_DELTA_SCREENS:
scrolling = vcons->scrolling
+ ((uint32_t) (value * vcons->state.screen.height));
break;
case CONS_SCROLL_ABSOLUTE_LINE:
scrolling = (uint32_t) value;
break;
case CONS_SCROLL_ABSOLUTE_PERCENTAGE:
scrolling = (uint32_t) (value * vcons->state.screen.scr_lines);
break;
default:
return 0;
}
if (scrolling < 0)
new_scr = 0;
else if (scrolling > vcons->state.screen.scr_lines)
new_scr = vcons->state.screen.scr_lines;
else
new_scr = scrolling;
if (new_scr == vcons->scrolling)
return 0;
scrolling = vcons->scrolling - new_scr;
{
uint32_t new_cur_line;
off_t size = vcons->state.screen.width
* vcons->state.screen.lines;
off_t vis_start;
off_t start;
off_t end;
if (vcons->state.screen.cur_line >= new_scr)
new_cur_line = vcons->state.screen.cur_line - new_scr;
else
new_cur_line = (UINT32_MAX - (new_scr - vcons->state.screen.cur_line)) + 1;
if (scrolling > 0 && (uint32_t) scrolling > vcons->state.screen.height)
scrolling = vcons->state.screen.height;
else if (scrolling < 0
&& (uint32_t) (-scrolling) > vcons->state.screen.height)
scrolling = -vcons->state.screen.height;
if ((scrolling > 0 && scrolling < vcons->state.screen.height)
|| (scrolling < 0
&& (uint32_t) (-scrolling) < vcons->state.screen.height))
cons_vcons_scroll (vcons, scrolling);
else if ((scrolling > 0 && scrolling == vcons->state.screen.height)
|| (scrolling < 0
&& (uint32_t) (-scrolling) == vcons->state.screen.height))
cons_vcons_clear (vcons, vcons->state.screen.width
* vcons->state.screen.height, 0, 0);
vis_start = vcons->state.screen.width
* (new_cur_line % vcons->state.screen.lines);
if (scrolling > 0)
start = (((new_cur_line % vcons->state.screen.lines)
+ vcons->state.screen.height - scrolling)
* vcons->state.screen.width) % size;
else
start = vis_start;
end = start + abs (scrolling) * vcons->state.screen.width - 1;
cons_vcons_write (vcons,
vcons->state.screen.matrix + start,
end < size
? end - start + 1
: size - start,
0, (scrolling > 0)
? vcons->state.screen.height - scrolling : 0);
if (end >= size)
cons_vcons_write (vcons,
vcons->state.screen.matrix,
end - size + 1,
0, (size - vis_start)
/ vcons->state.screen.width);
}
/* Set the new cursor position. */
{
uint32_t row = vcons->state.cursor.row;
uint32_t height = vcons->state.screen.height;
if (row + new_scr < height)
{
cons_vcons_set_cursor_pos (vcons, vcons->state.cursor.col,
row + new_scr);
if (row + vcons->scrolling >= height)
/* The cursor was invisible before. */
cons_vcons_set_cursor_status (vcons, vcons->state.cursor.status);
}
else if (row + vcons->scrolling < height)
/* The cursor was visible before. */
cons_vcons_set_cursor_status (vcons, CONS_CURSOR_INVISIBLE);
}
vcons->scrolling -= scrolling;
return -scrolling;
}
kern_return_t
cons_S_file_changed (cons_notify_t notify, natural_t tickno,
file_changed_type_t change,
off_t start, off_t end)
{
error_t err = 0;
vcons_t vcons = (vcons_t) notify;
if (!notify || notify->cons)
return EOPNOTSUPP;
mutex_lock (&vcons->lock);
switch (change)
{
case FILE_CHANGED_NULL:
/* Always sent first for sync. */
cons_vcons_refresh (vcons);
break;
case FILE_CHANGED_WRITE:
/* File data has been written. */
while (vcons->state.changes.written < vcons->display->changes.written)
{
cons_change_t change;
if (vcons->display->changes.written - vcons->state.changes.written
> vcons->cons->slack)
{
cons_vcons_refresh (vcons);
continue;
}
change = vcons->state.changes.buffer[vcons->state.changes.written
% vcons->state.changes.length];
if (vcons->display->changes.written - vcons->state.changes.written
> vcons->state.changes.length - 1)
{
/* While we were reading the entry, the server might
have overwritten it. */
cons_vcons_refresh (vcons);
continue;
}
vcons->state.changes.written++;
if (change.what.not_matrix)
{
if (change.what.cursor_pos)
{
uint32_t old_row = vcons->state.cursor.row;
uint32_t height = vcons->state.screen.height;
uint32_t row;
vcons->state.cursor.col = vcons->display->cursor.col;
row = vcons->state.cursor.row = vcons->display->cursor.row;
if (row + vcons->scrolling < height)
{
cons_vcons_set_cursor_pos (vcons,
vcons->state.cursor.col,
row + vcons->scrolling);
if (old_row + vcons->scrolling >= height)
/* The cursor was invisible before. */
cons_vcons_set_cursor_status (vcons,
vcons->state.cursor.status);
}
else if (old_row + vcons->scrolling < height)
/* The cursor was visible before. */
cons_vcons_set_cursor_status (vcons, CONS_CURSOR_INVISIBLE);
_cons_vcons_console_event (vcons, CONS_EVT_OUTPUT);
cons_vcons_update (vcons);
}
if (change.what.cursor_status)
{
vcons->state.cursor.status = vcons->display->cursor.status;
cons_vcons_set_cursor_status (vcons,
vcons->state.cursor.status);
cons_vcons_update (vcons);
}
if (change.what.screen_cur_line)
{
uint32_t new_cur_line;
new_cur_line = vcons->display->screen.cur_line;
if (new_cur_line != vcons->state.screen.cur_line)
{
off_t size = vcons->state.screen.width
* vcons->state.screen.lines;
off_t vis_start;
uint32_t scrolling;
off_t start;
off_t end;
if (new_cur_line > vcons->state.screen.cur_line)
scrolling = new_cur_line
- vcons->state.screen.cur_line;
else
scrolling = UINT32_MAX - vcons->state.screen.cur_line
+ 1 + new_cur_line;
/* If we are scrolling back, defer scrolling
until absolutely necessary. */
if (vcons->scrolling)
{
if (_cons_jump_down_on_output)
_cons_vcons_scrollback
(vcons, CONS_SCROLL_ABSOLUTE_LINE, 0);
else
{
if (vcons->scrolling + scrolling
<= vcons->state.screen.scr_lines)
{
vcons->scrolling += scrolling;
scrolling = 0;
}
else
{
scrolling -= vcons->state.screen.scr_lines
- vcons->scrolling;
vcons->scrolling
= vcons->state.screen.scr_lines;
}
}
}
if (scrolling)
{
uint32_t cur_disp_line;
if (new_cur_line >= vcons->scrolling)
cur_disp_line = new_cur_line - vcons->scrolling;
else
cur_disp_line = (UINT32_MAX - (vcons->scrolling - new_cur_line)) + 1;
if (scrolling > vcons->state.screen.height)
scrolling = vcons->state.screen.height;
if (scrolling < vcons->state.screen.height)
cons_vcons_scroll (vcons, scrolling);
else
cons_vcons_clear (vcons, vcons->state.screen.width
* vcons->state.screen.height,
0, 0);
vis_start = vcons->state.screen.width
* (cur_disp_line % vcons->state.screen.lines);
start = (((cur_disp_line % vcons->state.screen.lines)
+ vcons->state.screen.height - scrolling)
* vcons->state.screen.width) % size;
end = start + scrolling * vcons->state.screen.width - 1;
cons_vcons_write (vcons,
vcons->state.screen.matrix + start,
end < size
? end - start + 1
: size - start,
0, vcons->state.screen.height
- scrolling);
if (end >= size)
cons_vcons_write (vcons,
vcons->state.screen.matrix,
end - size + 1,
0, (size - vis_start)
/ vcons->state.screen.width);
_cons_vcons_console_event (vcons, CONS_EVT_OUTPUT);
cons_vcons_update (vcons);
}
vcons->state.screen.cur_line = new_cur_line;
}
}
if (change.what.screen_scr_lines)
{
vcons->state.screen.scr_lines
= vcons->display->screen.scr_lines;
if (vcons->state.screen.scr_lines < vcons->scrolling)
assert (!"Implement shrinking scrollback buffer! XXX");
}
if (change.what.bell_audible)
{
while (vcons->state.bell.audible
< vcons->display->bell.audible)
{
if (_cons_audible_bell == BELL_AUDIBLE)
cons_vcons_beep (vcons);
else if (_cons_audible_bell == BELL_VISUAL)
cons_vcons_flash (vcons);
vcons->state.bell.audible++;
}
}
if (change.what.bell_visible)
{
while (vcons->state.bell.visible
< vcons->display->bell.visible)
{
if (_cons_visual_bell == BELL_VISUAL)
cons_vcons_flash (vcons);
else if (_cons_visual_bell == BELL_AUDIBLE)
cons_vcons_beep (vcons);
vcons->state.bell.visible++;
}
}
if (change.what.flags)
{
uint32_t flags = vcons->display->flags;
if ((flags & CONS_FLAGS_SCROLL_LOCK)
!= (vcons->state.flags & CONS_FLAGS_SCROLL_LOCK))
cons_vcons_set_scroll_lock (vcons, flags
& CONS_FLAGS_SCROLL_LOCK);
vcons->state.flags = flags;
}
}
else
{
/* For clipping. */
off_t size = vcons->state.screen.width*vcons->state.screen.lines;
off_t rotate;
off_t vis_end = vcons->state.screen.height
* vcons->state.screen.width - 1;
off_t end2 = -1;
off_t start_rel = 0; /* start relative to visible start. */
off_t start = change.matrix.start;
off_t end = change.matrix.end;
if (vcons->scrolling && _cons_jump_down_on_output)
_cons_vcons_scrollback (vcons, CONS_SCROLL_ABSOLUTE_LINE, 0);
if (vcons->state.screen.cur_line >= vcons->scrolling)
rotate = vcons->state.screen.cur_line - vcons->scrolling;
else
rotate = (UINT32_MAX - (vcons->scrolling - vcons->state.screen.cur_line)) + 1;
rotate = vcons->state.screen.width * (rotate % vcons->state.screen.lines);
/* Rotate the buffer. */
start -= rotate;
if (start < 0)
start += size;
end -= rotate;
if (end < 0)
end += size;
/* Find the intersection. */
if (start > vis_end)
{
if (end < start)
{
start = 0;
if (vis_end < end)
end = vis_end;
}
else
start = -1;
}
else
{
if (end >= start)
{
if (end > vis_end)
end = vis_end;
}
else
{
end2 = end;
end = vis_end;
}
}
/* We now have three cases: No intersection if start ==
-1, one intersection [start;end] if end2 == -1, and
two intersections [start;end] and [0;end2] if end2 !=
-1. However, we still have to undo the buffer
rotation. */
if (start != -1)
{
start_rel = start;
start += rotate;
if (start >= size)
start -= size;
end += rotate;
if (end >= size)
end -= size;
if (start > end)
end += size;
}
if (end2 != -1)
/* The interval should be [vis_start:end2]. */
end2 += rotate;
if (start != -1)
{
cons_vcons_clear (vcons, end - start + 1,
start_rel % vcons->state.screen.width,
start_rel / vcons->state.screen.width);
cons_vcons_write (vcons, vcons->state.screen.matrix + start,
end < size
? end - start + 1
: size - start,
start_rel % vcons->state.screen.width,
start_rel / vcons->state.screen.width);
if (end >= size)
cons_vcons_write (vcons, vcons->state.screen.matrix,
end - size + 1,
(size - rotate)
% vcons->state.screen.width,
(size - rotate)
/ vcons->state.screen.width);
if (end2 != -1)
{
cons_vcons_clear (vcons, end2 - rotate + 1, 0, 0);
cons_vcons_write (vcons,
vcons->state.screen.matrix + rotate,
end2 < size
? end2 - rotate + 1
: size - rotate,
0, 0);
if (end2 >= size)
cons_vcons_write (vcons, vcons->state.screen.matrix,
end2 - size + 1,
(size - rotate)
% vcons->state.screen.width,
(size - rotate)
/ vcons->state.screen.width);
}
_cons_vcons_console_event (vcons, CONS_EVT_OUTPUT);
cons_vcons_update (vcons);
}
}
}
break;
case FILE_CHANGED_EXTEND:
/* File has grown. */
case FILE_CHANGED_TRUNCATE:
/* File has been truncated. */
case FILE_CHANGED_META:
/* Stat information has changed, and none of the previous three
apply. Not sent for changes in node times. */
default:
err = EINVAL;
};
mutex_unlock (&vcons->lock);
return err;
}
