1: # include   <pipes.h>
   2: # include   <symbol.h>
   3: # include   <sccs.h>
   4: 
   5: SCCSID(@(#)IIpb_prime.c	8.1	12/31/84)
   6: 
   7: 
   8: /*
   9: **  IIPB_PRIME -- prime a pipe for reading or writing
  10: **
  11: **	This clears out any nasty stuff in the pipe block.  If
  12: **	we are reading, it reads the first block so that we can
  13: **	know what sort it is.
  14: **
  15: **	Parameters:
  16: **		ppb -- a pointer to the pipe block.
  17: **		type -- if PB_NOTYPE, we are setting for reading.
  18: **			Otherwise, we are setting to write a
  19: **			message of the indicated type.
  20: **
  21: **	Returns:
  22: **		none
  23: **
  24: **	Side Effects:
  25: **		Changes *ppb.
  26: **
  27: **	Trace Flags:
  28: **		12.0
  29: */
  30: 
  31: IIpb_prime(ppb, type)
  32: register pb_t   *ppb;
  33: int     type;
  34: {
  35:     if (type == PB_NOTYPE)
  36:     {
  37:         /* read pipe prime -- get the first block */
  38:         IIpb_read(ppb);
  39:     }
  40:     else
  41:     {
  42:         /* write pipe prime -- set up initial pointers */
  43:         ppb->pb_from = ppb->pb_resp = PB_FRONT;
  44:         ppb->pb_type = type;
  45:         ppb->pb_stat = 0;
  46:         ppb->pb_nleft = PB_DBSIZE;
  47:         ppb->pb_nused = 0;
  48:         ppb->pb_st = mdPARSER;
  49:     }
  50: 
  51:     /* do common initialization */
  52:     ppb->pb_xptr = ppb->pb_data;
  53: }
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