440 lines
11 KiB
C
440 lines
11 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.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*-
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* buf.c --
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* Functions for automatically-expanded buffers.
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*/
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#include "sprite.h"
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#include "make.h"
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#include "buf.h"
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#ifndef max
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#define max(a,b) ((a) > (b) ? (a) : (b))
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#endif
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/*
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* BufExpand --
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* Expand the given buffer to hold the given number of additional
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* bytes.
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* Makes sure there's room for an extra NULL byte at the end of the
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* buffer in case it holds a string.
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*/
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#define BufExpand(bp, nb) do { \
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if ((bp)->left < (nb) + 1) { \
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int newSize = (bp)->size + max((nb) + 1, BUF_ADD_INC); \
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Byte *newBuf = erealloc((bp)->buffer, newSize); \
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\
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(bp)->inPtr = newBuf + ((bp)->inPtr - (bp)->buffer); \
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(bp)->outPtr = newBuf + ((bp)->outPtr - (bp)->buffer); \
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(bp)->buffer = newBuf; \
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(bp)->size = newSize; \
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(bp)->left = newSize - ((bp)->inPtr - (bp)->buffer); \
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} \
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} while (0)
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#define BUF_DEF_SIZE 256 /* Default buffer size */
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#define BUF_ADD_INC 256 /* Expansion increment when Adding */
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#define BUF_UNGET_INC 16 /* Expansion increment when Ungetting */
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/*-
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*-----------------------------------------------------------------------
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* Buf_OvAddByte --
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* Add a single byte to the buffer. left is zero or negative.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* The buffer may be expanded.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_OvAddByte(Buffer bp, Byte byte)
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{
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bp->left = 0;
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BufExpand(bp, 1);
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*bp->inPtr++ = byte;
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bp->left--;
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/*
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* Null-terminate
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*/
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*bp->inPtr = 0;
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_AddBytes --
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* Add a number of bytes to the buffer.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* Guess what?
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_AddBytes(Buffer bp, size_t numBytes, const Byte *bytesPtr)
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{
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BufExpand(bp, numBytes);
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memcpy(bp->inPtr, bytesPtr, numBytes);
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bp->inPtr += numBytes;
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bp->left -= numBytes;
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/*
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* Null-terminate
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*/
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*bp->inPtr = 0;
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_UngetByte --
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* Place the byte back at the beginning of the buffer.
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*
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* Results:
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* SUCCESS if the byte was added ok. FAILURE if not.
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*
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* Side Effects:
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* The byte is stuffed in the buffer and outPtr is decremented.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_UngetByte(Buffer bp, Byte byte)
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{
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if (bp->outPtr != bp->buffer) {
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bp->outPtr--;
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*bp->outPtr = byte;
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} else if (bp->outPtr == bp->inPtr) {
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*bp->inPtr = byte;
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bp->inPtr++;
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bp->left--;
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*bp->inPtr = 0;
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} else {
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/*
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* Yech. have to expand the buffer to stuff this thing in.
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* We use a different expansion constant because people don't
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* usually push back many bytes when they're doing it a byte at
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* a time...
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*/
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size_t numBytes = bp->inPtr - bp->outPtr;
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Byte *newBuf;
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newBuf = emalloc(bp->size + BUF_UNGET_INC);
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memcpy(newBuf + BUF_UNGET_INC, bp->outPtr, numBytes + 1);
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bp->outPtr = newBuf + BUF_UNGET_INC;
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bp->inPtr = bp->outPtr + numBytes;
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free(bp->buffer);
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bp->buffer = newBuf;
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bp->size += BUF_UNGET_INC;
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bp->left = bp->size - (bp->inPtr - bp->buffer);
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bp->outPtr -= 1;
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*bp->outPtr = byte;
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_UngetBytes --
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* Push back a series of bytes at the beginning of the buffer.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* outPtr is decremented and the bytes copied into the buffer.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_UngetBytes(Buffer bp, size_t numBytes, Byte *bytesPtr)
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{
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if ((size_t)(bp->outPtr - bp->buffer) >= numBytes) {
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bp->outPtr -= numBytes;
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memcpy(bp->outPtr, bytesPtr, numBytes);
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} else if (bp->outPtr == bp->inPtr) {
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Buf_AddBytes(bp, numBytes, bytesPtr);
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} else {
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size_t curNumBytes = bp->inPtr - bp->outPtr;
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Byte *newBuf;
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size_t newBytes = max(numBytes, BUF_UNGET_INC);
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newBuf = emalloc(bp->size + newBytes);
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memcpy(newBuf + newBytes, bp->outPtr, curNumBytes + 1);
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bp->outPtr = newBuf + newBytes;
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bp->inPtr = bp->outPtr + curNumBytes;
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free(bp->buffer);
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bp->buffer = newBuf;
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bp->size += newBytes;
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bp->left = bp->size - (bp->inPtr - bp->buffer);
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bp->outPtr -= numBytes;
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memcpy(bp->outPtr, bytesPtr, numBytes);
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}
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_GetByte --
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* Return the next byte from the buffer. Actually returns an integer.
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*
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* Results:
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* Returns BUF_ERROR if there's no byte in the buffer, or the byte
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* itself if there is one.
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*
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* Side Effects:
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* outPtr is incremented and both outPtr and inPtr will be reset if
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* the buffer is emptied.
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*
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*-----------------------------------------------------------------------
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*/
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int
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Buf_GetByte(Buffer bp)
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{
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int res;
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if (bp->inPtr == bp->outPtr)
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return (BUF_ERROR);
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res = (int)*bp->outPtr;
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bp->outPtr += 1;
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if (bp->outPtr == bp->inPtr) {
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bp->outPtr = bp->inPtr = bp->buffer;
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bp->left = bp->size;
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*bp->inPtr = 0;
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}
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return (res);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_GetBytes --
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* Extract a number of bytes from the buffer.
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*
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* Results:
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* The number of bytes gotten.
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*
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* Side Effects:
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* The passed array is overwritten.
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*
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*-----------------------------------------------------------------------
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*/
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int
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Buf_GetBytes(Buffer bp, size_t numBytes, Byte *bytesPtr)
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{
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if ((size_t)(bp->inPtr - bp->outPtr) < numBytes)
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numBytes = bp->inPtr - bp->outPtr;
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memcpy(bytesPtr, bp->outPtr, numBytes);
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bp->outPtr += numBytes;
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if (bp->outPtr == bp->inPtr) {
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bp->outPtr = bp->inPtr = bp->buffer;
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bp->left = bp->size;
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*bp->inPtr = 0;
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}
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return (numBytes);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_GetAll --
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* Get all the available data at once.
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*
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* Results:
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* A pointer to the data and the number of bytes available.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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Byte *
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Buf_GetAll(Buffer bp, size_t *numBytesPtr)
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{
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if (numBytesPtr != NULL)
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*numBytesPtr = bp->inPtr - bp->outPtr;
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return (bp->outPtr);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_Discard --
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* Throw away bytes in a buffer.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* The bytes are discarded.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_Discard(Buffer bp, size_t numBytes)
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{
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if ((size_t)(bp->inPtr - bp->outPtr) <= numBytes) {
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bp->inPtr = bp->outPtr = bp->buffer;
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bp->left = bp->size;
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*bp->inPtr = 0;
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} else
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bp->outPtr += numBytes;
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_Size --
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* Returns the number of bytes in the given buffer. Doesn't include
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* the null-terminating byte.
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*
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* Results:
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* The number of bytes.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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size_t
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Buf_Size(Buffer buf)
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{
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return (buf->inPtr - buf->outPtr);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_Init --
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* Initialize a buffer. If no initial size is given, a reasonable
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* default is used.
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*
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* Results:
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* A buffer to be given to other functions in this library.
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*
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* Side Effects:
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* The buffer is created, the space allocated and pointers
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* initialized.
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*
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*-----------------------------------------------------------------------
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*/
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Buffer
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Buf_Init(size_t size)
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{
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Buffer bp; /* New Buffer */
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bp = emalloc(sizeof(*bp));
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if (size <= 0)
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size = BUF_DEF_SIZE;
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bp->left = bp->size = size;
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bp->buffer = emalloc(size);
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bp->inPtr = bp->outPtr = bp->buffer;
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*bp->inPtr = 0;
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return (bp);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_Destroy --
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* Destroy a buffer, and optionally free its data, too.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* The buffer is freed.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_Destroy(Buffer buf, Boolean freeData)
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{
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if (freeData)
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free(buf->buffer);
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free(buf);
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}
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/*-
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*-----------------------------------------------------------------------
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* Buf_ReplaceLastByte --
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* Replace the last byte in a buffer.
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*
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* Results:
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* None.
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*
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* Side Effects:
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* If the buffer was empty intially, then a new byte will be added.
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* Otherwise, the last byte is overwritten.
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*
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*-----------------------------------------------------------------------
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*/
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void
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Buf_ReplaceLastByte(Buffer buf, Byte byte)
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{
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if (buf->inPtr == buf->outPtr)
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Buf_AddByte(buf, byte);
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else
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*(buf->inPtr - 1) = byte;
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}
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