Unsurprisingly, clang 3.3 is complaining about this bit of code:   
      
   clang -O2 -pipe  -Wall -W -c msgtool.c   
   msgtool.c:269:12: warning: cast to 'FILE *' (aka 'struct __sFILE *') from   
   smaller integer type 'int' [-Wint-to-pointer-cast]   
       return (FILE *) ! NULL;     /* Just say OK - but it *smells* */   
              ^   
   1 warning generated.   
      
   !NULL is 1. Why would you typecast 1 to FILE *? Baffling.   
      
   No doubt there's a potential segfault lurking in there somewhere...   
      
      
      
   --- GoldED+/BSD 1.1.5-b20110223-b20110223   
    * Origin: Blizzard of Ozz, Melbourne, Victoria, Australia (3:633/267)