ba6eb9dcb9
and the sizeof operator, missing empty lines, void casts, extra empty lines. Checked by: diff on make *.o lst.lib/*.o Submitted by: Max Okumoto <okumoto@soe.ucsd.edu> (partly)
440 lines
11 KiB
C
440 lines
11 KiB
C
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* 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.c 8.1 (Berkeley) 6/6/93
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*-
|
|
* 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 *)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 */
|
|
#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(Buffer bp, int byte)
|
|
{
|
|
bp->left = 0;
|
|
BufExpand(bp, 1);
|
|
|
|
*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_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(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(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(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(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(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.
|
|
*
|
|
* 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 --
|
|
* Destroy a buffer, and optionally free its data, too.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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;
|
|
}
|