some tabs to spaces

cd src
    grep -P -n '\t' *.c | grep -v "1:"
    cd ../include
    grep -P -n '\t' *.h | grep -v "1:"
    cd ..

side note: win/Qt/*.cpp are full of tabs

sys/msdos/msdos.c

@@ -43,7 +43,7 @@
  */
 #define READCHAR 0x00       /* Read Character from Keyboard */
 #define GETKEYFLAGS 0x02    /* Get Keyboard Flags */
-/*#define KEY_DEBUG	 */ /* print values of unexpected key codes - devel*/
+/*#define KEY_DEBUG */      /* print values of unexpected key codes - devel*/
 
 void get_cursor(int *, int *);
 
@@ -201,7 +201,7 @@ static const struct pad {
  * Unlike Ctrl-letter, the Alt-letter keystrokes have no specific ASCII
  * meaning unless assigned one by a keyboard conversion table, so the
  * keyboard BIOS normally does not return a character code when Alt-letter
- * is pressed.	So, to interpret unassigned Alt-letters, we must use a
+ * is pressed.  So, to interpret unassigned Alt-letters, we must use a
  * scan code table to translate the scan code into a letter, then set the
  * "meta" bit for it.  -3.
  */