[PATCH 1/4] conhost: add basic VT control sequence parsing

[Thomas Csovcsity]

From: Thomas Csovcsity <[e-mail]>

Remove Control Sequence Introducer(CSI) commands avoids console
scrambling
---
 programs/conhost/conhost.c | 60 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/programs/conhost/conhost.c b/programs/conhost/conhost.c
index 8298743553f..6bf81f97407 100644
--- a/programs/conhost/conhost.c
+++ b/programs/conhost/conhost.c
@@ -2107,6 +2107,9 @@ static NTSTATUS write_console( struct screen_buffer *screen_buffer, const WCHAR
 {
     RECT update_rect;
     size_t i, j;
+    enum {
+        ST_START, ST_PARAM, ST_INTER, ST_FINAL
+    } state;
 
     TRACE( "%s\n", debugstr_wn(buffer, len) );
 
@@ -2143,6 +2146,63 @@ static NTSTATUS write_console( struct screen_buffer *screen_buffer, const WCHAR
             case '\r':
                 screen_buffer->cursor_x = 0;
                 continue;
+            case '\e':
+                if ( buffer[i+1] == '[')
+                {
+	                FIXME( "CSI sequences not supported fully yet, only skipping control sequences\n" );
+                    state = ST_PARAM;
+                    i+=2;
+                }
+                else
+                {
+                    ERR("Invalid CSI start sequence\n");
+                    break;
+                }
+                /* intermediate bytes 0x30 - 0x3f (0-?) */
+                for (; i<len && (state == ST_PARAM); i++)
+                {
+                    switch (buffer[i])
+                    {
+                    case 0x30 ... 0x3b:
+                        continue;
+                    case 0x3c ... 0x3f: /* private for terminal manufacturers */
+                        WARN("This is a private -terminal manufacturer only- CSI sequence\n");
+                        continue;
+                    default:
+                        state = ST_INTER;
+                        break;
+                    }
+                    break;
+                }
+                /* intermediate bytes 0x20 - 0x2f*/
+                for (; i<len && (state == ST_INTER || state == ST_PARAM); i++)
+                {
+                    switch (buffer[i])
+                    {
+                    case 0x20 ... 0x2f:
+                        continue;
+                    default:
+                        state = ST_FINAL;
+                        break;
+                    }
+                    break;
+                }
+                if ( state == ST_START || state == ST_FINAL )
+                {
+                    switch (buffer[i])
+                    {
+                    case 0x40 ... 0x6F:
+                        break;
+                    case 0x70 ... 0x7E: /* private for terminal manufacturers */
+                        WARN("This is a private -terminal manufacturer only- CSI sequence\n");
+                        break;
+                    default:
+                        ERR("This was no valid CSI sequence\n");
+                        break;
+                    }
+                    i++;
+                    break;
+                }
             }
         }
         if (screen_buffer->cursor_x == screen_buffer->width && !(screen_buffer->mode & ENABLE_WRAP_AT_EOL_OUTPUT))
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/9973