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* Copyright (c) 1988 Regents of the University of California.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* from: @(#)ring.h 5.2 (Berkeley) 3/1/91
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* $Id: ring.h,v 1.13 1996/08/13 08:43:28 dholland Exp $
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virtual ~datasink() {}
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virtual int write(const char *buf, int len) = 0;
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virtual int writeurg(const char *buf, int len) = 0;
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* This defines a structure for a ring buffer.
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virtual int read(char *buf, int len) = 0;
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int size; /* total size of buffer */
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int head; /* next input character goes here */
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int tail; /* next output character comes from here */
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int count; /* chars presently stored in buffer */
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// The buffer is empty when head==tail.
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int marked; /* this character is marked */
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int gets(char *buf, int max);
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void putch(char c) { write(&c, 1); }
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void write(const char *buffer, int ct);
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void xprintf(const char *format, ...);
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int empty_count() { return size - count; }
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void clear_mark() { marked = -1; }
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void set_mark() { marked = head; }
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int init(int size, datasink *sink, source *src);
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datasink *setsink(datasink *nu) {
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datasink *old = binding;
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extern datasink *netsink, *ttysink, *nullsink;
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extern ringbuf::source *netsrc, *ttysrc;
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#define NETADD(c) { netoring.putch(c); }
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#define NET2ADD(c1,c2) { NETADD(c1); NETADD(c2); }