date and time created 92/12/13 03:50:21 by akito

[unix-history] / usr / src / sys / luna68k / stand / rcvbuf.h

/*
* Copyright (c) 1992 OMRON Corporation.
* Copyright (c) 1992 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* OMRON Corporation.
*
* %sccs.include.redist.c%
*
*      @(#)rcvbuf.h    7.1 (Berkeley) %G%
*/

/*
* rcvbuf.h -- receive buffer control structure definition
*      by A.Fujita, Dec-12-1992
*/

#define RBUF_SIZE       128

struct rcvbuf {
       u_char  *rb_push;
       u_char  *rb_pop;
       u_char   rb_buf[RBUF_SIZE+4];
};

#define RBUF_INIT(n)    rcvbuf[n].rb_pop = rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]

#define PUSH_RBUF(n, c) *(--rcvbuf[n].rb_push) = c ; \
                       if (rcvbuf[n].rb_push == rcvbuf[n].rb_buf) \
                               rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]

#define POP_RBUF(n, c)  c= *(--rcvbuf[n].rb_pop); \
                       if (rcvbuf[n].rb_pop == rcvbuf[n].rb_buf) \
                               rcvbuf[n].rb_pop = &rcvbuf[n].rb_buf[RBUF_SIZE]

#define RBUF_EMPTY(n)   (rcvbuf[n].rb_push == rcvbuf[n].rb_pop ? 1: 0)