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/* $OpenBSD: buf.c,v 1.14 2000/11/24 14:27:19 espie Exp $ */
/* $NetBSD: buf.c,v 1.9 1996/12/31 17:53:21 christos Exp $ */
/*
* Copyright (c) 1999 Marc Espie.
*
* Extensive code modifications for the OpenBSD project.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
* PROJECT 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, 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.
*/
/*-
* buf.c --
* Functions for automatically-expanded buffers.
*/
#include "sprite.h"
#include "make.h"
#include "buf.h"
#ifndef lint
#if 0
static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
#else
UNUSED
static char rcsid[] = "$OpenBSD: buf.c,v 1.14 2000/11/24 14:27:19 espie Exp $";
#endif
#endif /* not lint */
/* BufExpand --
* Expand the given buffer to hold the given number of additional
* chars. Makes sure there's room for an extra '\0' char at
* the end of the buffer to terminate the string. */
#define BufExpand(bp,nb) \
do { \
size_t occupied = (bp)->inPtr - (bp)->buffer; \
size_t size = (bp)->endPtr - (bp)->buffer; \
\
do { \
size *= 2 ; \
} while (size - occupied < (nb)+1+BUF_MARGIN); \
(bp)->buffer = (bp)->inPtr = (bp)->endPtr = \
erealloc((bp)->buffer, size); \
(bp)->inPtr += occupied; \
(bp)->endPtr += size; \
} while (0);
#define BUF_DEF_SIZE 256 /* Default buffer size */
#define BUF_MARGIN 256 /* Make sure we are comfortable */
/* Buf_AddChar hard case: buffer must be expanded to accommodate
* one more char. */
void
BufOverflow(bp)
Buffer bp;
{
BufExpand(bp, 1);
}
void
Buf_AddChars(bp, numBytes, bytesPtr)
Buffer bp;
size_t numBytes;
const char *bytesPtr;
{
if (bp->endPtr - bp->inPtr < numBytes+1)
BufExpand(bp, numBytes);
memcpy(bp->inPtr, bytesPtr, numBytes);
bp->inPtr += numBytes;
}
void
Buf_Init(bp, size)
Buffer bp; /* New Buffer */
size_t size; /* Initial size for the buffer */
{
if (size == 0)
size = BUF_DEF_SIZE;
bp->inPtr = bp->endPtr = bp->buffer = emalloc(size);
bp->endPtr += size;
}
void
Buf_ReplaceLastChar(buf, byte)
Buffer buf; /* buffer to augment */
char byte; /* byte to be written */
{
if (buf->inPtr == buf->buffer)
Buf_AddChar(buf, byte);
else
*(buf->inPtr - 1) = byte;
}
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