Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!sdd.hp.com!ucsd!ucselx!brian
From: brian@ucselx.sdsu.edu (Brian Ho)
Newsgroups: comp.graphics
Subject: A bug in PBM software (.pcx => pbm)
Message-ID: <1990Aug7.200352.1484@ucselx.sdsu.edu>
Date: 7 Aug 90 20:03:52 GMT
Organization: San Diego State University Computing Services
Lines: 32

I have find a bug (may not appear in other system) in the PBM software.
The bug is in the program which converts a .PCX (paint brush image format)
to a Pbm portable bitmap.

The bug (very small) appear at line 102 in program "pcxtopbm.c" which is
under /pbmplus/pbm/.  The orignal code read :

    if (b & 0xC0 == 0xC0) 
      ..
      ..

However, some system (e.g. Sun 3/50) does not like this.  It miss interpret it
as  
    if (b & (OxCO == 0xC0) 
      ..
      ..

Therefore,  I have simply put a parentesis around the '&' clause

    if ((b & OxC0) == 0xC0)
      ..
      ..

  and it works Great!!!!!!!


I don't if it (the bug) appears in other system.. keep me posted...

my E-mail address is

brian@yucatec.sdsu.edu
eden@cs.sdsu.edu