From 1fbbf3965775648f188e191e9230e0921d7b37e3 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 31 May 2017 23:07:32 -0400
Subject: implement origin mode

---
 src/parser.c |  9 +++++++++
 src/parser.l |  9 +++++++++
 src/screen.c | 17 +++++++++++++++++
 src/screen.h |  3 +++
 4 files changed, 38 insertions(+)

diff --git a/src/parser.c b/src/parser.c
index 870ec71..c13dfd1 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -2730,6 +2730,7 @@ static void vt100_parser_handle_ris(VT100Screen *vt)
     vt100_screen_reset_mouse_reporting_button_motion(vt);
     vt100_screen_reset_mouse_reporting_sgr_mode(vt);
     vt100_screen_reset_bracketed_paste(vt);
+    vt100_screen_reset_origin_mode(vt);
 }
 
 static void vt100_parser_handle_vb(VT100Screen *vt)
@@ -3033,6 +3034,10 @@ static void vt100_parser_handle_sm(VT100Screen *vt, char *buf, size_t len)
             case 1:
                 vt100_screen_set_application_cursor(vt);
                 break;
+            case 6:
+                vt100_screen_set_origin_mode(vt);
+                vt100_screen_move_to(vt, 0, 0);
+                break;
             case 9:
                 vt100_screen_set_mouse_reporting_press(vt);
                 break;
@@ -3103,6 +3108,10 @@ static void vt100_parser_handle_rm(VT100Screen *vt, char *buf, size_t len)
             case 1:
                 vt100_screen_reset_application_cursor(vt);
                 break;
+            case 6:
+                vt100_screen_reset_origin_mode(vt);
+                vt100_screen_move_to(vt, 0, 0);
+                break;
             case 9:
                 vt100_screen_reset_mouse_reporting_press(vt);
                 break;
diff --git a/src/parser.l b/src/parser.l
index a4e6cfd..573e387 100644
--- a/src/parser.l
+++ b/src/parser.l
@@ -335,6 +335,7 @@ static void vt100_parser_handle_ris(VT100Screen *vt)
     vt100_screen_reset_mouse_reporting_button_motion(vt);
     vt100_screen_reset_mouse_reporting_sgr_mode(vt);
     vt100_screen_reset_bracketed_paste(vt);
+    vt100_screen_reset_origin_mode(vt);
 }
 
 static void vt100_parser_handle_vb(VT100Screen *vt)
@@ -638,6 +639,10 @@ static void vt100_parser_handle_sm(VT100Screen *vt, char *buf, size_t len)
             case 1:
                 vt100_screen_set_application_cursor(vt);
                 break;
+            case 6:
+                vt100_screen_set_origin_mode(vt);
+                vt100_screen_move_to(vt, 0, 0);
+                break;
             case 9:
                 vt100_screen_set_mouse_reporting_press(vt);
                 break;
@@ -708,6 +713,10 @@ static void vt100_parser_handle_rm(VT100Screen *vt, char *buf, size_t len)
             case 1:
                 vt100_screen_reset_application_cursor(vt);
                 break;
+            case 6:
+                vt100_screen_reset_origin_mode(vt);
+                vt100_screen_move_to(vt, 0, 0);
+                break;
             case 9:
                 vt100_screen_reset_mouse_reporting_press(vt);
                 break;
diff --git a/src/screen.c b/src/screen.c
index b909cfb..e031e3e 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -261,6 +261,13 @@ void vt100_screen_move_to(VT100Screen *vt, int row, int col)
         : col >= vt->grid->max.col ? vt->grid->max.col - 1
         : col;
 
+    if (vt->origin_mode) {
+        row += vt->grid->scroll_top;
+        if (row > vt->grid->scroll_bottom) {
+            row = vt->grid->scroll_bottom;
+        }
+    }
+
     vt->grid->cur.row = row;
     vt->grid->cur.col = col;
 }
@@ -835,6 +842,16 @@ void vt100_screen_reset_bracketed_paste(VT100Screen *vt)
     vt->bracketed_paste = 0;
 }
 
+void vt100_screen_set_origin_mode(VT100Screen *vt)
+{
+    vt->origin_mode = 1;
+}
+
+void vt100_screen_reset_origin_mode(VT100Screen *vt)
+{
+    vt->origin_mode = 0;
+}
+
 void vt100_screen_set_window_title(VT100Screen *vt, char *buf, size_t len)
 {
     free(vt->title);
diff --git a/src/screen.h b/src/screen.h
index bd52d49..9a4f24e 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -97,6 +97,7 @@ struct vt100_screen {
     unsigned int mouse_reporting_button_motion: 1;
     unsigned int mouse_reporting_sgr_mode: 1;
     unsigned int bracketed_paste: 1;
+    unsigned int origin_mode: 1;
 
     unsigned int visual_bell: 1;
     unsigned int audible_bell: 1;
@@ -178,6 +179,8 @@ void vt100_screen_set_mouse_reporting_sgr_mode(VT100Screen *vt);
 void vt100_screen_reset_mouse_reporting_sgr_mode(VT100Screen *vt);
 void vt100_screen_set_bracketed_paste(VT100Screen *vt);
 void vt100_screen_reset_bracketed_paste(VT100Screen *vt);
+void vt100_screen_set_origin_mode(VT100Screen *vt);
+void vt100_screen_reset_origin_mode(VT100Screen *vt);
 void vt100_screen_set_window_title(VT100Screen *vt, char *buf, size_t len);
 void vt100_screen_set_icon_name(VT100Screen *vt, char *buf, size_t len);
 int vt100_screen_row_max_col(VT100Screen *vt, int row);
-- 
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