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David,

if I call astPurgeWCS on an empty FitsChan before doing anything
else to it, I get a SEGV:

   #include <stdio.h>
   #include "ast.h"

   const char *source();
   void sink( const char * );

   int main() {
      AstFitsChan *fc;
      fc = astFitsChan( source, sink, "" );
      astPurgeWCS( fc );
   }

   const char *source() {
      return NULL;
   }

   void sink( const char *line ) {
   }

Mark

-- 
Mark Taylor   Astronomical Programmer   Physics, Bristol University, UK
[log in to unmask] +44-117-928-8776 http://www.star.bris.ac.uk/~mbt/