import yaft from https://github.com/uobikiemukot/yaft.git commit c455d6a8

src/gui/widget/yaft/ctrlseq/esc.h

@@ -0,0 +1,99 @@
+/* See LICENSE for licence details. */
+/* function for control character */
+void bs(struct terminal_t *term)
+{
+	if (term->mode & MODE_VWBS
+		&& term->cursor.x - 1 >= 0
+		&& term->cells[term->cursor.y][term->cursor.x - 1].width == NEXT_TO_WIDE)
+		move_cursor(term, 0, -2);
+	else
+		move_cursor(term, 0, -1);
+}
+
+void tab(struct terminal_t *term)
+{
+	int i;
+
+	for (i = term->cursor.x + 1; i < term->cols; i++) {
+		if (term->tabstop[i]) {
+			set_cursor(term, term->cursor.y, i);
+			return;
+		}
+	}
+	set_cursor(term, term->cursor.y, term->cols - 1);
+}
+
+void nl(struct terminal_t *term)
+{
+	move_cursor(term, 1, 0);
+}
+
+void cr(struct terminal_t *term)
+{
+	set_cursor(term, term->cursor.y, 0);
+}
+
+void enter_esc(struct terminal_t *term)
+{
+	term->esc.state = STATE_ESC;
+}
+
+/* function for escape sequence */
+void save_state(struct terminal_t *term)
+{
+	term->state.mode = term->mode & MODE_ORIGIN;
+	term->state.cursor = term->cursor;
+	term->state.attribute = term->attribute;
+}
+
+void restore_state(struct terminal_t *term)
+{
+	/* restore state */
+	if (term->state.mode & MODE_ORIGIN)
+		term->mode |= MODE_ORIGIN;
+	else
+		term->mode &= ~MODE_ORIGIN;
+	term->cursor    = term->state.cursor;
+	term->attribute = term->state.attribute;
+}
+
+void crnl(struct terminal_t *term)
+{
+	cr(term);
+	nl(term);
+}
+
+void set_tabstop(struct terminal_t *term)
+{
+	term->tabstop[term->cursor.x] = true;
+}
+
+void reverse_nl(struct terminal_t *term)
+{
+	move_cursor(term, -1, 0);
+}
+
+void identify(struct terminal_t *term)
+{
+	ewrite(term->fd, "\033[?6c", 5); /* "I am a VT102" */
+}
+
+void enter_csi(struct terminal_t *term)
+{
+	term->esc.state = STATE_CSI;
+}
+
+void enter_osc(struct terminal_t *term)
+{
+	term->esc.state = STATE_OSC;
+}
+
+void enter_dcs(struct terminal_t *term)
+{
+	term->esc.state = STATE_DCS;
+}
+
+void ris(struct terminal_t *term)
+{
+	reset(term);
+}