=== modified file 'src/catools/tool_lib.c'
--- src/catools/tool_lib.c	2014-10-09 12:12:39 +0000
+++ src/catools/tool_lib.c	2015-02-05 16:58:35 +0000
@@ -68,6 +68,10 @@
     case hex: sprintf(ret, "0x%lX", val); break;
     case oct: sprintf(ret, "0o%lo", val); break;
     case bin:
+        if (val == 0) {
+            strcpy(ret, "0");
+            break;
+        }
         for (i=31; i>=0 ; i--)
         {
             bit = (val>>i) & 0x1L;