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93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
/*-
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* Copyright (c) 1988, 1989, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)buf.h 8.2 (Berkeley) 4/28/95
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* $FreeBSD$
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*/
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#ifndef buf_h_a61a6812
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#define buf_h_a61a6812
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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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#include <sys/types.h>
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#include "sprite.h"
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/*
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* There are several places where expandable buffers are used (parse.c and
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* var.c). This constant is merely the starting point for those buffers. If
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* lines tend to be much shorter than this, it would be best to reduce BSIZE.
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* If longer, it should be increased. Reducing it will cause more copying to
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* be done for longer lines, but will save space for shorter ones. In any
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* case, it ought to be a power of two simply because most storage allocation
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* schemes allocate in powers of two.
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*/
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#define MAKE_BSIZE 256 /* starting size for expandable buffers */
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#define BUF_ERROR 256
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typedef char Byte;
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typedef struct Buffer {
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size_t size; /* Current size of the buffer */
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size_t 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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/* Buf_AddByte adds a single byte to a buffer. */
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#define Buf_AddByte(bp, byte) \
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(void)(--(bp)->left <= 0 ? Buf_OvAddByte((bp), (byte)), 1 : \
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(*(bp)->inPtr++ = (byte), *(bp)->inPtr = 0), 1)
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void Buf_OvAddByte(Buffer *, Byte);
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void Buf_AddBytes(Buffer *, size_t, const Byte *);
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Byte *Buf_GetAll(Buffer *, size_t *);
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void Buf_Discard(Buffer *, size_t);
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size_t Buf_Size(Buffer *);
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Buffer *Buf_Init(size_t);
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void Buf_Destroy(Buffer *, Boolean);
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void Buf_ReplaceLastByte(Buffer *, Byte);
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#endif /* buf_h_a61a6812 */
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