83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
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* Copyright (c) 1988, 1989 by Adam de Boor
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* Copyright (c) 1989 by Berkeley Softworks
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Adam de Boor.
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*
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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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* are met:
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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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*
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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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* SUCH DAMAGE.
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*
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* from: @(#)buf.h 5.4 (Berkeley) 12/28/90
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* $Id: buf.h,v 1.2 1993/08/01 18:12:06 mycroft Exp $
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*/
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/*-
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* buf.h --
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* Header for users of the buf library.
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*/
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#ifndef _BUF_H
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#define _BUF_H
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#include "sprite.h"
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typedef unsigned char Byte;
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typedef struct Buffer {
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int size; /* Current size of the buffer */
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int left; /* Space left (== size - (inPtr - buffer)) */
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Byte *buffer; /* The buffer itself */
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Byte *inPtr; /* Place to write to */
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Byte *outPtr; /* Place to read from */
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} *Buffer;
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Buffer Buf_Init(); /* Initialize a buffer */
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void Buf_Destroy(); /* Destroy a buffer */
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void Buf_AddBytes(); /* Add a range of bytes to a buffer */
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int Buf_GetByte(); /* Get a byte from a buffer */
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int Buf_GetBytes(); /* Get multiple bytes */
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void Buf_UngetByte(); /* Push a byte back into the buffer */
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void Buf_UngetBytes(); /* Push many bytes back into the buf */
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Byte *Buf_GetAll(); /* Get them all */
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void Buf_Discard(); /* Throw away some of the bytes */
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int Buf_Size(); /* See how many are there */
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/* Buf_AddByte adds a single byte to a buffer. */
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#define Buf_AddByte(bp, byte) \
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(--(bp)->left <= 0 ? Buf_OvAddByte(bp, byte) : \
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(void)(*(bp)->inPtr++ = (byte), *(bp)->inPtr = 0))
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void Buf_OvAddByte(); /* adds a byte when buffer overflows */
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#define BUF_ERROR 256
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#endif _BUF_H
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