# include <pipes.h>
# include <symbol.h>
# include <sccs.h>
SCCSID(@(#)IIpb_prime.c 8.1 12/31/84)
/*
** IIPB_PRIME -- prime a pipe for reading or writing
**
** This clears out any nasty stuff in the pipe block. If
** we are reading, it reads the first block so that we can
** know what sort it is.
**
** Parameters:
** ppb -- a pointer to the pipe block.
** type -- if PB_NOTYPE, we are setting for reading.
** Otherwise, we are setting to write a
** message of the indicated type.
**
** Returns:
** none
**
** Side Effects:
** Changes *ppb.
**
** Trace Flags:
** 12.0
*/
IIpb_prime(ppb, type)
register pb_t *ppb;
int type;
{
if (type == PB_NOTYPE)
{
/* read pipe prime -- get the first block */
IIpb_read(ppb);
}
else
{
/* write pipe prime -- set up initial pointers */
ppb->pb_from = ppb->pb_resp = PB_FRONT;
ppb->pb_type = type;
ppb->pb_stat = 0;
ppb->pb_nleft = PB_DBSIZE;
ppb->pb_nused = 0;
ppb->pb_st = mdPARSER;
}
/* do common initialization */
ppb->pb_xptr = ppb->pb_data;
}