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BSD 4.3

#include "../h/rt.h"

/*
 * deffile - if dp is null, default to def; otherwise, make sure it's a file.
 */

deffile(dp, def)
struct descrip *dp, *def;
   {
   DeRef(*dp)
   if (NULLDESC(*dp)) {
      *dp = *def;
      return 1;
      }
   if (QUAL(*dp) || TYPE(*dp) != T_FILE)
      runerr(105, dp);
   return 0;
   }

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