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Add support to CSI b sequence (repeat last char) #15

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Merged
kdj0c merged 1 commit into from
Jan 16, 2026
Merged

Add support to CSI b sequence (repeat last char) #15

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1 change: 1 addition & 0 deletions src/tsm/libtsm-int.h
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,7 @@ void screen_cell_init(struct tsm_screen *con, struct cell *cell);
void tsm_screen_set_opts(struct tsm_screen *scr, unsigned int opts);
void tsm_screen_reset_opts(struct tsm_screen *scr, unsigned int opts);
unsigned int tsm_screen_get_opts(struct tsm_screen *scr);
void tsm_screen_repeat_char(struct tsm_screen *con, unsigned int num);

static inline void screen_inc_age(struct tsm_screen *con)
{
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30 changes: 30 additions & 0 deletions src/tsm/tsm-screen.c
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Expand Up @@ -1550,6 +1550,36 @@ void tsm_screen_insert_chars(struct tsm_screen *con, unsigned int num)
screen_cell_init(con, &cells[con->cursor_x + i]);
}

void tsm_screen_repeat_char(struct tsm_screen *con, unsigned int num)
{
struct cell *cells;
unsigned int max, i;

if (!con || !num || !con->size_y || !con->size_x)
return;

screen_inc_age(con);
/* TODO: more sophisticated ageing */
con->age = con->age_cnt;

if (con->cursor_x >= con->size_x)
con->cursor_x = con->size_x - 1;
if (con->cursor_y >= con->size_y)
con->cursor_y = con->size_y - 1;

if (!con->cursor_x)
return;

max = con->size_x - con->cursor_x;
if (num > max)
num = max;

cells = con->lines[con->cursor_y]->cells;
for (i = 0; i < num; i++)
cells[con->cursor_x + i] = cells[con->cursor_x - 1];
con->cursor_x += num;
}

SHL_EXPORT
void tsm_screen_delete_chars(struct tsm_screen *con, unsigned int num)
{
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6 changes: 5 additions & 1 deletion src/tsm/tsm-vte.c
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Expand Up @@ -2065,7 +2065,11 @@ static void do_csi(struct tsm_vte *vte, uint32_t data)
if (vte->csi_argv[0] == 18 || vte->csi_argv[0] == 19)
csi_report_window_size(vte);
else
llog_debug(vte, "unhandled CSI t sequence %c", data);
llog_debug(vte, "unhandled CSI t sequence %d", vte->csi_argv[0]);
break;
case 'b': /* Repeat last char */
num = vte->csi_argv[0];
tsm_screen_repeat_char(vte->con, num);
break;
default:
llog_debug(vte, "unhandled CSI sequence %c", data);
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