437 lines
11 KiB
C
437 lines
11 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.
|
||
*/
|
||
|
||
#ifndef lint
|
||
static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
|
||
#endif /* not lint */
|
||
|
||
/*-
|
||
* 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) \
|
||
if (bp->left < (nb)+1) {\
|
||
int newSize = (bp)->size + max((nb)+1,BUF_ADD_INC); \
|
||
Byte *newBuf = (Byte *) realloc((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 */
|
||
#define BUF_ADD_INC 256 /* Expansion increment when Adding */
|
||
#define BUF_UNGET_INC 16 /* Expansion increment when Ungetting */
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* 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 (bp, byte)
|
||
register 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 (bp, numBytes, bytesPtr)
|
||
register Buffer bp;
|
||
int numBytes;
|
||
Byte *bytesPtr;
|
||
{
|
||
|
||
BufExpand (bp, numBytes);
|
||
|
||
memcpy (bp->inPtr, bytesPtr, numBytes);
|
||
bp->inPtr += numBytes;
|
||
bp->left -= numBytes;
|
||
|
||
/*
|
||
* Null-terminate
|
||
*/
|
||
*bp->inPtr = 0;
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Buf_UngetByte --
|
||
* Place the byte back at the beginning of the buffer.
|
||
*
|
||
* Results:
|
||
* SUCCESS if the byte was added ok. FAILURE if not.
|
||
*
|
||
* Side Effects:
|
||
* The byte is stuffed in the buffer and outPtr is decremented.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
void
|
||
Buf_UngetByte (bp, byte)
|
||
register Buffer bp;
|
||
int byte;
|
||
{
|
||
|
||
if (bp->outPtr != bp->buffer) {
|
||
bp->outPtr--;
|
||
*bp->outPtr = byte;
|
||
} else if (bp->outPtr == bp->inPtr) {
|
||
*bp->inPtr = byte;
|
||
bp->inPtr++;
|
||
bp->left--;
|
||
*bp->inPtr = 0;
|
||
} else {
|
||
/*
|
||
* Yech. have to expand the buffer to stuff this thing in.
|
||
* We use a different expansion constant because people don't
|
||
* usually push back many bytes when they're doing it a byte at
|
||
* a time...
|
||
*/
|
||
int numBytes = bp->inPtr - bp->outPtr;
|
||
Byte *newBuf;
|
||
|
||
newBuf = (Byte *)emalloc(bp->size + BUF_UNGET_INC);
|
||
memcpy ((char *)(newBuf+BUF_UNGET_INC), (char *)bp->outPtr, numBytes+1);
|
||
bp->outPtr = newBuf + BUF_UNGET_INC;
|
||
bp->inPtr = bp->outPtr + numBytes;
|
||
free ((char *)bp->buffer);
|
||
bp->buffer = newBuf;
|
||
bp->size += BUF_UNGET_INC;
|
||
bp->left = bp->size - (bp->inPtr - bp->buffer);
|
||
bp->outPtr -= 1;
|
||
*bp->outPtr = byte;
|
||
}
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Buf_UngetBytes --
|
||
* Push back a series of bytes at the beginning of the buffer.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side Effects:
|
||
* outPtr is decremented and the bytes copied into the buffer.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
void
|
||
Buf_UngetBytes (bp, numBytes, bytesPtr)
|
||
register Buffer bp;
|
||
int numBytes;
|
||
Byte *bytesPtr;
|
||
{
|
||
|
||
if (bp->outPtr - bp->buffer >= numBytes) {
|
||
bp->outPtr -= numBytes;
|
||
memcpy (bp->outPtr, bytesPtr, numBytes);
|
||
} else if (bp->outPtr == bp->inPtr) {
|
||
Buf_AddBytes (bp, numBytes, bytesPtr);
|
||
} else {
|
||
int curNumBytes = bp->inPtr - bp->outPtr;
|
||
Byte *newBuf;
|
||
int newBytes = max(numBytes,BUF_UNGET_INC);
|
||
|
||
newBuf = (Byte *)emalloc (bp->size + newBytes);
|
||
memcpy((char *)(newBuf+newBytes), (char *)bp->outPtr, curNumBytes+1);
|
||
bp->outPtr = newBuf + newBytes;
|
||
bp->inPtr = bp->outPtr + curNumBytes;
|
||
free ((char *)bp->buffer);
|
||
bp->buffer = newBuf;
|
||
bp->size += newBytes;
|
||
bp->left = bp->size - (bp->inPtr - bp->buffer);
|
||
bp->outPtr -= numBytes;
|
||
memcpy ((char *)bp->outPtr, (char *)bytesPtr, numBytes);
|
||
}
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Buf_GetByte --
|
||
* Return the next byte from the buffer. Actually returns an integer.
|
||
*
|
||
* Results:
|
||
* Returns BUF_ERROR if there's no byte in the buffer, or the byte
|
||
* itself if there is one.
|
||
*
|
||
* Side Effects:
|
||
* outPtr is incremented and both outPtr and inPtr will be reset if
|
||
* the buffer is emptied.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
int
|
||
Buf_GetByte (bp)
|
||
register Buffer bp;
|
||
{
|
||
int res;
|
||
|
||
if (bp->inPtr == bp->outPtr) {
|
||
return (BUF_ERROR);
|
||
} else {
|
||
res = (int) *bp->outPtr;
|
||
bp->outPtr += 1;
|
||
if (bp->outPtr == bp->inPtr) {
|
||
bp->outPtr = bp->inPtr = bp->buffer;
|
||
bp->left = bp->size;
|
||
*bp->inPtr = 0;
|
||
}
|
||
return (res);
|
||
}
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Buf_GetBytes --
|
||
* Extract a number of bytes from the buffer.
|
||
*
|
||
* Results:
|
||
* The number of bytes gotten.
|
||
*
|
||
* Side Effects:
|
||
* The passed array is overwritten.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
int
|
||
Buf_GetBytes (bp, numBytes, bytesPtr)
|
||
register Buffer bp;
|
||
int numBytes;
|
||
Byte *bytesPtr;
|
||
{
|
||
|
||
if (bp->inPtr - bp->outPtr < numBytes) {
|
||
numBytes = bp->inPtr - bp->outPtr;
|
||
}
|
||
memcpy (bytesPtr, bp->outPtr, numBytes);
|
||
bp->outPtr += numBytes;
|
||
|
||
if (bp->outPtr == bp->inPtr) {
|
||
bp->outPtr = bp->inPtr = bp->buffer;
|
||
bp->left = bp->size;
|
||
*bp->inPtr = 0;
|
||
}
|
||
return (numBytes);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* 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 (bp, numBytesPtr)
|
||
register 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 (bp, numBytes)
|
||
register 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 (buf)
|
||
Buffer buf;
|
||
{
|
||
return (buf->inPtr - buf->outPtr);
|
||
}
|
||
|
||
/*-
|
||
*-----------------------------------------------------------------------
|
||
* Buf_Init --
|
||
* Initialize a buffer. If no initial size is given, a reasonable
|
||
* default is used.
|
||
*
|
||
* 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 (size)
|
||
int size; /* Initial size for the buffer */
|
||
{
|
||
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.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side Effects:
|
||
* The buffer is freed.
|
||
*
|
||
*-----------------------------------------------------------------------
|
||
*/
|
||
void
|
||
Buf_Destroy (buf, freeData)
|
||
Buffer buf; /* Buffer to destroy */
|
||
Boolean freeData; /* TRUE if the data should be destroyed as well */
|
||
{
|
||
|
||
if (freeData) {
|
||
free ((char *)buf->buffer);
|
||
}
|
||
free ((char *)buf);
|
||
}
|