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rcvbuf.h revision 1.3 
      1 /*	$NetBSD: rcvbuf.h,v 1.3 2015/02/14 05:03:09 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992 OMRON Corporation.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * OMRON Corporation.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	@(#)rcvbuf.h	8.1 (Berkeley) 6/10/93
     38  */
     39 /*
     40  * Copyright (c) 1992, 1993
     41  *	The Regents of the University of California.  All rights reserved.
     42  *
     43  * This code is derived from software contributed to Berkeley by
     44  * OMRON Corporation.
     45  *
     46  * Redistribution and use in source and binary forms, with or without
     47  * modification, are permitted provided that the following conditions
     48  * are met:
     49  * 1. Redistributions of source code must retain the above copyright
     50  *    notice, this list of conditions and the following disclaimer.
     51  * 2. Redistributions in binary form must reproduce the above copyright
     52  *    notice, this list of conditions and the following disclaimer in the
     53  *    documentation and/or other materials provided with the distribution.
     54  * 3. Neither the name of the University nor the names of its contributors
     55  *    may be used to endorse or promote products derived from this software
     56  *    without specific prior written permission.
     57  *
     58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     68  * SUCH DAMAGE.
     69  *
     70  *	@(#)rcvbuf.h	8.1 (Berkeley) 6/10/93
     71  */
     72 
     73 /*
     74  * rcvbuf.h -- receive buffer control structure definition
     75  *	by A.Fujita, Dec-12-1992
     76  */
     77 
     78 #define	RBUF_SIZE	128
     79 
     80 struct rcvbuf {
     81 	uint8_t	* volatile rb_push;
     82 	uint8_t	* volatile rb_pop;
     83 	uint8_t	 rb_buf[RBUF_SIZE + 4];
     84 };
     85 
     86 #define RBUF_INIT(n)							\
     87 do {									\
     88 	rcvbuf[n].rb_pop = rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE]; \
     89 } while (/* CONSTCOND */0)
     90 
     91 #define PUSH_RBUF(n, c)							\
     92 do {									\
     93 	*(--rcvbuf[n].rb_push) = (c);					\
     94 	if (rcvbuf[n].rb_push == rcvbuf[n].rb_buf)			\
     95 		rcvbuf[n].rb_push = &rcvbuf[n].rb_buf[RBUF_SIZE];	\
     96 } while (/* CONSTCOND */0)
     97 
     98 #define POP_RBUF(n, c)							\
     99 do {									\
    100 	(c) = *(--rcvbuf[n].rb_pop);					\
    101 	if (rcvbuf[n].rb_pop == rcvbuf[n].rb_buf)			\
    102 		rcvbuf[n].rb_pop = &rcvbuf[n].rb_buf[RBUF_SIZE];	\
    103 } while (/* CONSTCOND */0)
    104 
    105 #define RBUF_EMPTY(n)	(rcvbuf[n].rb_push == rcvbuf[n].rb_pop)
    106 
    107 extern	struct rcvbuf	rcvbuf[];
    108