infocom/interpreters/nitfol/undo_redo.patch

*** z_io.c.old	Mon Nov  1 08:56:06 1999
--- z_io.c	Mon Nov  1 08:58:15 1999
***************
*** 900,912 ****
  
    length = n_read(text + 1, maxlen, operand[1], 0,
  		  operand[2], operand[3], &term);
!   if(!read_abort)
      LOBYTEwrite(text + 1 + length, 0);  /* zero terminator */
  
!   if(allow_saveundo) {
!     if(!has_done_save_undo && auto_save_undo)
!       saveundo(FALSE);
!     has_done_save_undo = FALSE;
    }
  }
  
--- 900,913 ----
  
    length = n_read(text + 1, maxlen, operand[1], 0,
  		  operand[2], operand[3], &term);
!   if(!read_abort) {
      LOBYTEwrite(text + 1 + length, 0);  /* zero terminator */
  
!     if(allow_saveundo) {
!       if(!has_done_save_undo && auto_save_undo)
!         saveundo(FALSE);
!       has_done_save_undo = FALSE;
!     }
    }
  }
  
***************
*** 928,940 ****
    if(!read_abort) {
      LOBYTEwrite(text + 1, length);
      mop_store_result(term);
    }
- 
-   if(allow_saveundo) {
-     if(!has_done_save_undo && auto_save_undo)
-       saveundo(FALSE);
-     has_done_save_undo = FALSE;
-   }
  }
  
  void op_read_char(void)
--- 929,941 ----
    if(!read_abort) {
      LOBYTEwrite(text + 1, length);
      mop_store_result(term);
+   
+     if(allow_saveundo) {
+       if(!has_done_save_undo && auto_save_undo)
+         saveundo(FALSE);
+       has_done_save_undo = FALSE;
+     }
    }
  }
  
  void op_read_char(void)