[PATCH 08/11] tty: vt: simplify some unicode conditions

Jiri Slaby (SUSE)
2023-01-12T08:03:00Z

After previous patches, we can simply test vc->vc_uni_lines, so do so in
many unicode functions. This makes the code more compact. And even use
if (!)
return;
in vc_uniscr_scroll(), so that the whole code is indented on the left.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
drivers/tty/vt/vt.c | 85 +++++++++++++++++++--------------------------
1 file changed, 36 insertions(+), 49 deletions(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index db72375141b0..74db07b32abe 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -357,18 +357,14 @@ static void vc_uniscr_set(struct vc_data *vc, u32 **new_uni_lines)

static void vc_uniscr_putc(struct vc_data *vc, u32 uc)
{
- u32 **uni_lines = vc->vc_uni_lines;
-
- if (uni_lines)
- uni_lines[vc->state.y][vc->state.x] = uc;
+ if (vc->vc_uni_lines)
+ vc->vc_uni_lines[vc->state.y][vc->state.x] = uc;
}

static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
{
- u32 **uni_lines = vc->vc_uni_lines;
-
- if (uni_lines) {
- u32 *ln = uni_lines[vc->state.y];
+ if (vc->vc_uni_lines) {
+ u32 *ln = vc->vc_uni_lines[vc->state.y];
unsigned int x = vc->state.x, cols = vc->vc_cols;

memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
@@ -378,10 +374,8 @@ static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)

static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
{
- u32 **uni_lines = vc->vc_uni_lines;
-
- if (uni_lines) {
- u32 *ln = uni_lines[vc->state.y];
+ if (vc->vc_uni_lines) {
+ u32 *ln = vc->vc_uni_lines[vc->state.y];
unsigned int x = vc->state.x, cols = vc->vc_cols;

memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
@@ -392,59 +386,52 @@ static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
unsigned int nr)
{
- u32 **uni_lines = vc->vc_uni_lines;
-
- if (uni_lines) {
- u32 *ln = uni_lines[vc->state.y];
-
- memset32(&ln[x], ' ', nr);
- }
+ if (vc->vc_uni_lines)
+ memset32(&vc->vc_uni_lines[vc->state.y][x], ' ', nr);
}

static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
unsigned int nr)
{
- u32 **uni_lines = vc->vc_uni_lines;
-
- if (uni_lines) {
- unsigned int cols = vc->vc_cols;
-
+ if (vc->vc_uni_lines)
while (nr--)
- memset32(uni_lines[y++], ' ', cols);
- }
+ memset32(vc->vc_uni_lines[y++], ' ', vc->vc_cols);
}

static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
enum con_scroll dir, unsigned int nr)
{
u32 **uni_lines = vc->vc_uni_lines;
+ unsigned int i, j, k, sz, d, clear;

- if (uni_lines) {
- unsigned int i, j, k, sz, d, clear;
+ if (!uni_lines)
+ return;

- sz = b - t;
- clear = b - nr;
- d = nr;
- if (dir == SM_DOWN) {
- clear = t;
- d = sz - nr;
- }
- for (i = 0; i < gcd(d, sz); i++) {
- u32 *tmp = uni_lines[t + i];
- j = i;
- while (1) {
- k = j + d;
- if (k >= sz)
- k -= sz;
- if (k == i)
- break;
- uni_lines[t + j] = uni_lines[t + k];
- j = k;
- }
- uni_lines[t + j] = tmp;
+ sz = b - t;
+ clear = b - nr;
+ d = nr;
+
+ if (dir == SM_DOWN) {
+ clear = t;
+ d = sz - nr;
+ }
+
+ for (i = 0; i < gcd(d, sz); i++) {
+ u32 *tmp = uni_lines[t + i];
+ j = i;
+ while (1) {
+ k = j + d;
+ if (k >= sz)
+ k -= sz;
+ if (k == i)
+ break;
+ uni_lines[t + j] = uni_lines[t + k];
+ j = k;
}
- vc_uniscr_clear_lines(vc, clear, nr);
+ uni_lines[t + j] = tmp;
}
+
+ vc_uniscr_clear_lines(vc, clear, nr);
}

static void vc_uniscr_copy_area(u32 **dst_lines,
--
2.39.0