--- capa/capa51/pProj/capaUnit.c	2000/06/30 21:36:16	1.5
+++ capa/capa51/pProj/capaUnit.c	2000/09/14 20:25:12	1.9
@@ -2,29 +2,36 @@
    Copyright (C) 1992-2000 Michigan State University
 
    The CAPA system is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
+   modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.
 
    The CAPA system is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Library General Public License for more details.
+   General Public License for more details.
 
-   You should have received a copy of the GNU Library General Public
+   You should have received a copy of the GNU General Public
    License along with the CAPA system; see the file COPYING.  If not,
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   Boston, MA 02111-1307, USA.
+
+   As a special exception, you have permission to link this program
+   with the TtH/TtM library and distribute executables, as long as you
+   follow the requirements of the GNU GPL in regard to all of the
+   software in the executable aside from TtH/TtM.
+*/
 
 /* =||>|===================== capaUnit.c   =====================|<||= */
 /*   created by Isaac Tsai   1997                                    */
-/*   copyrighted by Isaac Tsai 1997, 1998, 1999                      */
+/*   by Isaac Tsai 1997, 1998, 1999                      */
 /* =||>|========================================================|<||= */
 #include <stdio.h>        /* fopen()  */
 #include <stdlib.h>
 #include <ctype.h>        /* isalnum()   */
 #include <string.h>
 #include <math.h>
+#include <float.h>
 
 #include "capaParser.h"
 
@@ -1736,18 +1743,18 @@ p_new_unit(Unit_t *left_p, Unit_t *right
             err_code = 3;
 	    cu_p->u_type   = U_UNKNOWN;
           }
-        } else {
+        } else { /* symb_str is not in <prefix><units> form */
           /* printf("<<%s>>", symb_str); */
           err_code = 2;
 	  cu_p->u_type   = U_UNKNOWN;
         }
       } else {/* len == 1 */
-        /* printf(" not found\n"); */
+        /* printf(" not found in symbol tree \n"); */
         err_code = 1;
 	cu_p->u_type   = U_UNKNOWN;
       }
     }
-  } else {
+  } else { /* why would we have a length less than zero symb_str ? */
     err_code = 4;
   }