NetBSD/usr.bin/make/buf.h

82 lines
3.3 KiB
C

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