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/*
* Copyright (c) 1988 Regents of the University of California.
* 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.
* 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.
*
* from: @(#)ring.h 5.2 (Berkeley) 3/1/91
* $Id: ring.h,v 1.13 1996/08/13 08:43:28 dholland Exp $
*/
class datasink {
public:
virtual ~datasink() {}
virtual int write(const char *buf, int len) = 0;
virtual int writeurg(const char *buf, int len) = 0;
};
/*
* This defines a structure for a ring buffer.
*/
class ringbuf {
public:
class source {
public:
virtual ~source() {}
virtual int read(char *buf, int len) = 0;
};
protected:
datasink *binding;
source *srcbinding;
char *buf;
int size; /* total size of buffer */
int head; /* next input character goes here */
int tail; /* next output character comes from here */
int count; /* chars presently stored in buffer */
// The buffer is empty when head==tail.
int marked; /* this character is marked */
public:
/////// consume end
// manual consume
int gets(char *buf, int max);
int getch(int *ch);
void ungetch(int ch);
int full_count() {
return count;
}
// automatic consume
int flush();
/////// supply end
// manual supply
void putch(char c) { write(&c, 1); }
void write(const char *buffer, int ct);
void xprintf(const char *format, ...);
int empty_count() { return size - count; }
// automatic supply
int read_source();
/////// others
void clear_mark() { marked = -1; }
void set_mark() { marked = head; }
int init(int size, datasink *sink, source *src);
datasink *setsink(datasink *nu) {
datasink *old = binding;
binding = nu;
return old;
}
};
extern datasink *netsink, *ttysink, *nullsink;
extern ringbuf::source *netsrc, *ttysrc;
#define NETADD(c) { netoring.putch(c); }
#define NET2ADD(c1,c2) { NETADD(c1); NETADD(c2); }
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