freebsd-dev/sys/dev/sound/midi/midiq.h
2007-02-25 13:51:52 +00:00

107 lines
5.5 KiB
C

/*-
* Copyright (c) 2003 Mathew Kanner
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef MIDIQ_H
#define MIDIQ_H
#define MIDIQ_MOVE(a,b,c) bcopy(b,a,c)
#define MIDIQ_HEAD(name, type) \
struct name { \
int h, t, s; \
type * b; \
}
#define MIDIQ_INIT(head, buf, size) do { \
(head).h=(head).t=0; \
(head).s=size; \
(head).b=buf; \
} while (0)
#define MIDIQ_EMPTY(head) ((head).h == (head).t )
#define MIDIQ_LENBASE(head) ((head).h - (head).t < 0 ? \
(head).h - (head).t + (head).s : \
(head).h - (head).t)
#define MIDIQ_FULL(head) ((head).h == -1)
#define MIDIQ_AVAIL(head) (MIDIQ_FULL(head) ? 0 : (head).s - MIDIQ_LENBASE(head))
#define MIDIQ_LEN(head) ((head).s - MIDIQ_AVAIL(head))
#define MIDIQ_DEBUG 0
/*
* No protection against overflow, underflow
*/
#define MIDIQ_ENQ(head, buf, size) do { \
if(MIDIQ_DEBUG)\
printf("#1 %p %p bytes copied %jd tran req s %d h %d t %d\n", \
&(head).b[(head).h], (buf), \
(intmax_t)(sizeof(*(head).b) * \
MIN( (size), (head).s - (head).h) ), \
(size), (head).h, (head).t); \
MIDIQ_MOVE(&(head).b[(head).h], (buf), sizeof(*(head).b) * MIN((size), (head).s - (head).h)); \
if( (head).s - (head).h < (size) ) { \
if(MIDIQ_DEBUG) \
printf("#2 %p %p bytes copied %jd\n", (head).b, (buf) + (head).s - (head).h, (intmax_t)sizeof(*(head).b) * ((size) - (head).s + (head).h) ); \
MIDIQ_MOVE((head).b, (buf) + (head).s - (head).h, sizeof(*(head).b) * ((size) - (head).s + (head).h) ); \
} \
(head).h+=(size); \
(head).h%=(head).s; \
if(MIDIQ_EMPTY(head)) (head).h=-1; \
if(MIDIQ_DEBUG)\
printf("#E h %d t %d\n", (head).h, (head).t); \
} while (0)
#define MIDIQ_DEQ_I(head, buf, size, move, update) do { \
if(MIDIQ_FULL(head)) (head).h=(head).t; \
if(MIDIQ_DEBUG)\
printf("#1 %p %p bytes copied %jd tran req s %d h %d t %d\n", &(head).b[(head).t], (buf), (intmax_t)sizeof(*(head).b) * MIN((size), (head).s - (head).t), (size), (head).h, (head).t); \
if (move) MIDIQ_MOVE((buf), &(head).b[(head).t], sizeof(*(head).b) * MIN((size), (head).s - (head).t)); \
if( (head).s - (head).t < (size) ) { \
if(MIDIQ_DEBUG) \
printf("#2 %p %p bytes copied %jd\n", (head).b, (buf) + (head).s - (head).t, (intmax_t)sizeof(*(head).b) * ((size) - (head).s + (head).t) ); \
if (move) MIDIQ_MOVE((buf) + (head).s - (head).t, (head).b, sizeof(*(head).b) * ((size) - (head).s + (head).t) ); \
} \
if (update) { \
(head).t+=(size); \
(head).t%=(head).s; \
} else { \
if (MIDIQ_EMPTY(head)) (head).h=-1; \
} \
if(MIDIQ_DEBUG)\
printf("#E h %d t %d\n", (head).h, (head).t); \
} while (0)
#define MIDIQ_SIZE(head) ((head).s)
#define MIDIQ_CLEAR(head) ((head).h = (head).t = 0)
#define MIDIQ_BUF(head) ((head).b)
#define MIDIQ_DEQ(head, buf, size) MIDIQ_DEQ_I(head, buf, size, 1, 1)
#define MIDIQ_PEEK(head, buf, size) MIDIQ_DEQ_I(head, buf, size, 1, 0)
#define MIDIQ_POP(head, size) MIDIQ_DEQ_I(head, &head, size, 0, 1)
#endif