/*      $NetBSD: rcvbuf.h,v 1.3 2015/02/14 05:03:09 tsutsui Exp $       */

/*
* Copyright (c) 1992 OMRON Corporation.
*
* This code is derived from software contributed to Berkeley by
* OMRON Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)rcvbuf.h    8.1 (Berkeley) 6/10/93
*/
/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* OMRON Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)rcvbuf.h    8.1 (Berkeley) 6/10/93
*/

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

#define RBUF_SIZE       128

struct rcvbuf {
       uint8_t * volatile rb_push;
       uint8_t * volatile rb_pop;
       uint8_t  rb_buf[RBUF_SIZE + 4];
};

#define RBUF_INIT(n)                                                    \
do {                                                                    \
       rcvbuf[n].rb_pop = rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]; \
} while (/* CONSTCOND */0)

#define PUSH_RBUF(n, c)                                                 \
do {                                                                    \
       *(--rcvbuf[n].rb_push) = (c);                                   \
       if (rcvbuf[n].rb_push == rcvbuf[n].rb_buf)                      \
               rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE];       \
} while (/* CONSTCOND */0)

#define POP_RBUF(n, c)                                                  \
do {                                                                    \
       (c) = *(--rcvbuf[n].rb_pop);                                    \
       if (rcvbuf[n].rb_pop == rcvbuf[n].rb_buf)                       \
               rcvbuf[n].rb_pop = &rcvbuf[n].rb_buf[RBUF_SIZE];        \
} while (/* CONSTCOND */0)

#define RBUF_EMPTY(n)   (rcvbuf[n].rb_push == rcvbuf[n].rb_pop)

extern  struct rcvbuf   rcvbuf[];