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BSD 4.2

#define NDDATA	1
#define NDLABEL	2
#define NDADDR	3
#define NDNULL	4




typedef
  struct IoAddr
    {
      int stg;
      int memno;
      ftnint offset;
    }
  ioaddr;



typedef
  union IoValue
    {
      Constp cp;
      ftnint label;
      struct IoAddr addr;
    }
  iovalue;



typedef
  struct IoBlock
    {
      struct IoBlock *next;
      int blkno;
      ftnint len;
      struct OffsetList *olist;
    }
  ioblock;



typedef
  struct OffsetList
    {
      struct OffsetList *next;
      ftnint offset;
      int tag;
      union IoValue val;
    }
  offsetlist;




extern ioblock *iodata;

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