/* $NetBSD: buf.c,v 1.15 2004/05/07 00:04:38 ross Exp $ */
/*
* Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
* 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. 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.
*/
/*
* 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.
*/
#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: buf.c,v 1.15 2004/05/07 00:04:38 ross Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: buf.c,v 1.15 2004/05/07 00:04:38 ross Exp $");
#endif
#endif /* not lint */
#endif
/*-
* buf.c --
* Functions for automatically-expanded buffers.
*/
#include "sprite.h"
#include "make.h"
#include "buf.h"
#ifndef max
#define max(a,b) ((a) > (b) ? (a) : (b))
#endif
/*
* BufExpand --
* Expand the given buffer to hold the given number of additional
* bytes.
* Makes sure there's room for an extra NULL byte at the end of the
* buffer in case it holds a string.
*/
#define BufExpand(bp,nb) \
while (bp->left < (nb)+1) {\
int newSize = (bp)->size * 2; \
Byte *newBuf = (Byte *) erealloc((bp)->buffer, newSize); \
\
(bp)->inPtr = newBuf + ((bp)->inPtr - (bp)->buffer); \
(bp)->outPtr = newBuf + ((bp)->outPtr - (bp)->buffer);\
(bp)->buffer = newBuf;\
(bp)->size = newSize;\
(bp)->left = newSize - ((bp)->inPtr - (bp)->buffer);\
}
#define BUF_DEF_SIZE 256 /* Default buffer size */
/*-
*-----------------------------------------------------------------------
* Buf_OvAddByte --
* Add a single byte to the buffer. left is zero or negative.
*
* Results:
* None.
*
* Side Effects:
* The buffer may be expanded.
*
*-----------------------------------------------------------------------
*/
void
Buf_OvAddByte(Buffer bp, int byte)
{
int nbytes = 1;
bp->left = 0;
BufExpand (bp, nbytes);
*bp->inPtr++ = byte;
bp->left--;
/*
* Null-terminate
*/
*bp->inPtr = 0;
}
/*-
*-----------------------------------------------------------------------
* Buf_AddBytes --
* Add a number of bytes to the buffer.
*
* Results:
* None.
*
* Side Effects:
* Guess what?
*
*-----------------------------------------------------------------------
*/
void
Buf_AddBytes(Buffer bp, int numBytes, const Byte *bytesPtr)
{
BufExpand (bp, numBytes);
memcpy (bp->inPtr, bytesPtr, numBytes);
bp->inPtr += numBytes;
bp->left -= numBytes;
/*
* Null-terminate
*/
*bp->inPtr = 0;
}
/*-
*-----------------------------------------------------------------------
* Buf_GetAll --
* Get all the available data at once.
*
* Results:
* A pointer to the data and the number of bytes available.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
Byte *
Buf_GetAll(Buffer bp, int *numBytesPtr)
{
if (numBytesPtr != (int *)NULL) {
*numBytesPtr = bp->inPtr - bp->outPtr;
}
return (bp->outPtr);
}
/*-
*-----------------------------------------------------------------------
* Buf_Discard --
* Throw away bytes in a buffer.
*
* Results:
* None.
*
* Side Effects:
* The bytes are discarded.
*
*-----------------------------------------------------------------------
*/
void
Buf_Discard(Buffer bp, int numBytes)
{
if (bp->inPtr - bp->outPtr <= numBytes) {
bp->inPtr = bp->outPtr = bp->buffer;
bp->left = bp->size;
*bp->inPtr = 0;
} else {
bp->outPtr += numBytes;
}
}
/*-
*-----------------------------------------------------------------------
* Buf_Size --
* Returns the number of bytes in the given buffer. Doesn't include
* the null-terminating byte.
*
* Results:
* The number of bytes.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
int
Buf_Size(Buffer buf)
{
return (buf->inPtr - buf->outPtr);
}
/*-
*-----------------------------------------------------------------------
* Buf_Init --
* Initialize a buffer. If no initial size is given, a reasonable
* default is used.
*
* Input:
* size Initial size for the buffer
*
* Results:
* A buffer to be given to other functions in this library.
*
* Side Effects:
* The buffer is created, the space allocated and pointers
* initialized.
*
*-----------------------------------------------------------------------
*/
Buffer
Buf_Init(int size)
{
Buffer bp; /* New Buffer */
bp = (Buffer)emalloc(sizeof(*bp));
if (size <= 0) {
size = BUF_DEF_SIZE;
}
bp->left = bp->size = size;
bp->buffer = (Byte *)emalloc(size);
bp->inPtr = bp->outPtr = bp->buffer;
*bp->inPtr = 0;
return (bp);
}
/*-
*-----------------------------------------------------------------------
* Buf_Destroy --
* Nuke a buffer and all its resources.
*
* Input:
* buf Buffer to destroy
* freeData TRUE if the data should be destroyed
*
* Results:
* None.
*
* Side Effects:
* The buffer is freed.
*
*-----------------------------------------------------------------------
*/
void
Buf_Destroy(Buffer buf, Boolean freeData)
{
if (freeData) {
free ((char *)buf->buffer);
}
free ((char *)buf);
}
/*-
*-----------------------------------------------------------------------
* Buf_ReplaceLastByte --
* Replace the last byte in a buffer.
*
* Input:
* buf buffer to augment
* byte byte to be written
*
* Results:
* None.
*
* Side Effects:
* If the buffer was empty intially, then a new byte will be added.
* Otherwise, the last byte is overwritten.
*
*-----------------------------------------------------------------------
*/
void
Buf_ReplaceLastByte(Buffer buf, int byte)
{
if (buf->inPtr == buf->outPtr)
Buf_AddByte(buf, byte);
else
*(buf->inPtr - 1) = byte;
}
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