From 20684afa8ca5bae9e3ba0f37855e5954d44e0c50 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 17 Jul 2019 11:19:28 +0200
Subject: [PATCH] csi: implement \E[@ (ICH - insert characters)

---
 csi.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/csi.c b/csi.c
index 9f89ccd2..d9d20d13 100644
--- a/csi.c
+++ b/csi.c
@@ -498,7 +498,7 @@ csi_dispatch(struct terminal *term, uint8_t final)
         }
 
         case 'P': {
-            /* DCH: Delete character */
+            /* DCH: Delete character(s) */
 
             /* Number of characters to delete */
             int count = min(
@@ -511,22 +511,37 @@ csi_dispatch(struct terminal *term, uint8_t final)
             memmove(&term->grid->cur_row->cells[term->cursor.col],
                     &term->grid->cur_row->cells[term->cursor.col + count],
                     remaining * sizeof(term->grid->cur_row->cells[0]));
-#if 0
-            term_damage_update(term, term->cursor.linear, remaining);
-#else
             term->grid->cur_row->dirty = true;
-#endif
 
             /* Erase the remainder of the line */
             term_erase(
                 term,
                 &(struct coord){term->cursor.col + remaining, term->cursor.row},
                 &(struct coord){term->cols - 1, term->cursor.row});
-#if 0
+            break;
+        }
+
+        case '@': {
+            /* ICH: insert character(s) */
+
+            /* Number of characters to insert */
+            int count = min(
+                vt_param_get(term, 0, 1), term->cols - term->cursor.col);
+
+            /* Characters to move */
+            int remaining = term->cols - (term->cursor.col + count);
+
+            /* Push existing characters */
+            memmove(&term->grid->cur_row->cells[term->cursor.col + count],
+                    &term->grid->cur_row->cells[term->cursor.col],
+                    remaining * sizeof(term->grid->cur_row->cells[0]));
+            term->grid->cur_row->dirty = true;
+
+            /* Erase (insert space characters) */
             term_erase(
-                term, term->cursor.linear + remaining,
-                term->cursor.linear + remaining + count);
-#endif
+                term,
+                &term->cursor,
+                &(struct coord){term->cursor.col + count - 1, term->cursor.row});
             break;
         }
 
@@ -547,12 +562,6 @@ csi_dispatch(struct terminal *term, uint8_t final)
                 term,
                 &term->cursor,
                 &(struct coord){term->cursor.col + count - 1, term->cursor.row});
-
-#if 0
-            memset(&term->grid->cur_line[term->cursor.col],
-                   0, count * sizeof(term->grid->cur_line[0]));
-            term_damage_erase(term, term->cursor.linear, count);
-#endif
             break;
         }