From: fujieda AT jaist DOT ac DOT jp (Kazuhiro Fujieda)
Subject: another fhandler_console bug
22 Jan 1999 04:51:11 -0800
Message-ID: <u4spjijkg.fsf.cygnus.cygwin32.developers@parvati.will.or.jp>
Mime-Version: 1.0 (generated by SEMI MIME-Edit 0.100 - "Shijima")
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To: cygwin32-developers AT cygnus DOT com

When an arrow key is pushed repeatedly in bash executed in notty
mode on Win9x, the escape sequence correspond to one arrow key
is often interleaved with another one's.

As a result, part of the sequence (`[D', `[C', and so on) is
inserted into the command line instead of the cursor motion.

The following patch can solve this problem.

--- fhandler_console.cc-	Mon Jan 18 15:54:02 1999
+++ fhandler_console.cc	Wed Jan 20 20:48:59 1999
@@ -27,19 +27,20 @@ details. */
 static void
 undo_input (HANDLE h, const char *ptr)
 {
-  INPUT_RECORD input_rec;
   DWORD n;
+  DWORD len = strlen (ptr) * 2;
+  INPUT_RECORD input_rec[len];
 
-  memset (&input_rec, 0, sizeof (input_rec));
-  input_rec.EventType = KEY_EVENT;
-  while (*ptr)
-    {
-      input_rec.Event.KeyEvent.uChar.AsciiChar = *ptr++;
-      input_rec.Event.KeyEvent.bKeyDown = 1;
-      WriteConsoleInput (h, &input_rec, 1, &n);
-      input_rec.Event.KeyEvent.bKeyDown = 0;
-      WriteConsoleInput (h, &input_rec, 1, &n);
+  memset (input_rec, 0, sizeof(INPUT_RECORD) * len);
+  for (DWORD i = 0; i < len; i += 2)
+    {
+      input_rec[i].EventType = KEY_EVENT;
+      input_rec[i].Event.KeyEvent.uChar.AsciiChar = *ptr++;
+      input_rec[i].Event.KeyEvent.bKeyDown = 1;
+      input_rec[i + 1] = input_rec[i];
+      input_rec[i + 1].Event.KeyEvent.bKeyDown = 0;
     }
+  WriteConsoleInput (h, input_rec, len, &n);
 }
 
 static struct
@@ -1208,23 +1209,19 @@ fhandler_console::read1 (char *buf, size
 	  const char *ptr = get_nonascii_key (input_rec);
 	  if (!ptr)
 	    continue;
-	  while (*ptr && copied_chars < lenin)
-	    buf[copied_chars++] = *ptr++;
-	  if (*ptr)
-	    undo_input (hndl, ptr);
+	  undo_input (hndl, ptr);
+	  continue;
 	}
       else /* keep it */
 	{
 	  if (input_rec.Event.KeyEvent.dwControlKeyState & LEFT_ALT_PRESSED)
 	    {
-	      char tmp[2];
-	      tmp[0] = tolower (input_rec.Event.KeyEvent.uChar.AsciiChar);
-	      tmp[1] = 0;
-	      buf[copied_chars++] = '\033';
-	      if (copied_chars < lenin)
-		buf[copied_chars++] = tmp[0];
-	      else
-		undo_input (hndl, tmp);
+	      char tmp[3];
+	      tmp[0] = '\033';
+	      tmp[1] = tolower (input_rec.Event.KeyEvent.uChar.AsciiChar);
+	      tmp[2] = 0;
+	      undo_input (hndl, tmp);
+	      continue;
 	    }
 	  else
 	    buf[copied_chars++] = input_rec.Event.KeyEvent.uChar.AsciiChar;

____
  | AIST      Kazuhiro Fujieda <fujieda AT jaist DOT ac DOT jp>
  | HOKURIKU  School of Information Science
o_/ 1990      Japan Advanced Institute of Science and Technology