/* $NetBSD: buf.c,v 1.14 2003/08/07 11:14:48 agc 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. */ #ifdef MAKE_BOOTSTRAP static char rcsid[] = "$NetBSD: buf.c,v 1.14 2003/08/07 11:14:48 agc Exp $"; #else #include #ifndef lint #if 0 static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93"; #else __RCSID("$NetBSD: buf.c,v 1.14 2003/08/07 11:14:48 agc 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; }