Implement ANSI escape sequences for cursor up/forward

These escape sequences are required for proper handling of line
editing when the input exceeds the console width.

1 files changed, 30 insertions, 0 deletions

diff --git a/win32/winansi.c b/win32/winansi.c
index d929bcc66..415105fcd 100644
--- a/win32/winansi.c
+++ b/win32/winansi.c
@@ -123,6 +123,30 @@ static void erase_till_end_of_screen(void)
                                             pos, &dummy);
 }
 
+static void move_cursor_up(int n)
+{
+        CONSOLE_SCREEN_BUFFER_INFO sbi;
+
+        if (!console)
+                return;
+
+        GetConsoleScreenBufferInfo(console, &sbi);
+        sbi.dwCursorPosition.Y -= n;
+        SetConsoleCursorPosition(console, sbi.dwCursorPosition);
+}
+
+static void move_cursor_forward(int n)
+{
+        CONSOLE_SCREEN_BUFFER_INFO sbi;
+
+        if (!console)
+                return;
+
+        GetConsoleScreenBufferInfo(console, &sbi);
+        sbi.dwCursorPosition.X += n;
+        SetConsoleCursorPosition(console, sbi.dwCursorPosition);
+}
+
 static void move_cursor_back(int n)
 {
         CONSOLE_SCREEN_BUFFER_INFO sbi;
@@ -285,6 +309,12 @@ static const char *set_attr(const char *str)
 
                 set_console_attr();
                 break;
+        case 'A':
+                move_cursor_up(strtol(str, (char **)&str, 10));
+                break;
+        case 'C':
+                move_cursor_forward(strtol(str, (char **)&str, 10));
+                break;
         case 'D':
                 move_cursor_back(strtol(str, (char **)&str, 10));
                 break;