Commit 89765b94 authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
Browse files

tty: vt, unify scrolling functions 



Both scrup and scrdown are copies of the same code except source and
destination pointers computation. Unify those functions into a single
one named con_scroll.

Note that scrdown used step to compute the destination, while scrup
did the computation explicitly. We sticked to the latter here.

Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d705ff38

drivers/tty/vt/vt.c

+17 −30
Original line number Diff line number Diff line
@@ -315,40 +315,27 @@ void schedule_console_callback(void) 
	schedule_work(&console_work);

}



static void scrup(struct vc_data *vc, unsigned int t, unsigned int b,

		unsigned int nr)

static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,

		enum con_scroll dir, unsigned int nr)

{

	unsigned short *d, *s;

	u16 *clear, *d, *s;



	if (t + nr >= b)

		nr = b - t - 1;

	if (b > vc->vc_rows || t >= b || nr < 1)

		return;

	if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))

	if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))

		return;

	d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);

	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));

	scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);

	scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,

		    vc->vc_size_row * nr);

}



static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b,

		unsigned int nr)

{

	unsigned short *s;

	unsigned int step;

	s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);

	d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));



	if (t+nr >= b)

		nr = b - t - 1;

	if (b > vc->vc_rows || t >= b || nr < 1)

		return;

	if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))

		return;

	s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);

	step = vc->vc_cols * nr;

	scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);

	scr_memsetw(s, vc->vc_video_erase_char, 2 * step);

	if (dir == SM_UP) {

		clear = s + (b - t - nr) * vc->vc_cols;

		swap(s, d);

	}

	scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);

	scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);

}



static void do_update_region(struct vc_data *vc, unsigned long start, int count)
@@ -1117,7 +1104,7 @@ static void lf(struct vc_data *vc) 
	 * if below scrolling region

	 */

    	if (vc->vc_y + 1 == vc->vc_bottom)

		scrup(vc, vc->vc_top, vc->vc_bottom, 1);

		con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);

	else if (vc->vc_y < vc->vc_rows - 1) {

	    	vc->vc_y++;

		vc->vc_pos += vc->vc_size_row;
@@ -1132,7 +1119,7 @@ static void ri(struct vc_data *vc) 
	 * if above scrolling region

	 */

	if (vc->vc_y == vc->vc_top)

		scrdown(vc, vc->vc_top, vc->vc_bottom, 1);

		con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);

	else if (vc->vc_y > 0) {

		vc->vc_y--;

		vc->vc_pos -= vc->vc_size_row;
@@ -1628,7 +1615,7 @@ static void csi_L(struct vc_data *vc, unsigned int nr) 
		nr = vc->vc_rows - vc->vc_y;

	else if (!nr)

		nr = 1;

	scrdown(vc, vc->vc_y, vc->vc_bottom, nr);

	con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_DOWN, nr);

	vc->vc_need_wrap = 0;

}
@@ -1649,7 +1636,7 @@ static void csi_M(struct vc_data *vc, unsigned int nr) 
		nr = vc->vc_rows - vc->vc_y;

	else if (!nr)

		nr=1;

	scrup(vc, vc->vc_y, vc->vc_bottom, nr);

	con_scroll(vc, vc->vc_y, vc->vc_bottom, SM_UP, nr);

	vc->vc_need_wrap = 0;

}

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