mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
292 lines
8.0 KiB
C
292 lines
8.0 KiB
C
/* $NetBSD: buf.c,v 1.25 2012/04/24 20:26:58 sjg 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.
|
|
*/
|
|
|
|
#ifndef MAKE_NATIVE
|
|
static char rcsid[] = "$NetBSD: buf.c,v 1.25 2012/04/24 20:26:58 sjg Exp $";
|
|
#else
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)buf.c 8.1 (Berkeley) 6/6/93";
|
|
#else
|
|
__RCSID("$NetBSD: buf.c,v 1.25 2012/04/24 20:26:58 sjg Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
#endif
|
|
|
|
/*-
|
|
* buf.c --
|
|
* Functions for automatically-expanded buffers.
|
|
*/
|
|
|
|
#include "make.h"
|
|
#include "buf.h"
|
|
|
|
#ifndef max
|
|
#define max(a,b) ((a) > (b) ? (a) : (b))
|
|
#endif
|
|
|
|
#define BUF_DEF_SIZE 256 /* Default buffer size */
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Buf_Expand_1 --
|
|
* Extend buffer for single byte add.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
void
|
|
Buf_Expand_1(Buffer *bp)
|
|
{
|
|
bp->size += max(bp->size, 16);
|
|
bp->buffer = bmake_realloc(bp->buffer, bp->size);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* 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)
|
|
{
|
|
int count = bp->count;
|
|
Byte *ptr;
|
|
|
|
if (__predict_false(count + numBytes >= bp->size)) {
|
|
bp->size += max(bp->size, numBytes + 16);
|
|
bp->buffer = bmake_realloc(bp->buffer, bp->size);
|
|
}
|
|
|
|
ptr = bp->buffer + count;
|
|
bp->count = count + numBytes;
|
|
ptr[numBytes] = 0;
|
|
memcpy(ptr, bytesPtr, 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 != NULL)
|
|
*numBytesPtr = bp->count;
|
|
|
|
return (bp->buffer);
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Buf_Empty --
|
|
* Throw away bytes in a buffer.
|
|
*
|
|
* Results:
|
|
* None.
|
|
*
|
|
* Side Effects:
|
|
* The bytes are discarded.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
void
|
|
Buf_Empty(Buffer *bp)
|
|
{
|
|
|
|
bp->count = 0;
|
|
*bp->buffer = 0;
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* 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.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
void
|
|
Buf_Init(Buffer *bp, int size)
|
|
{
|
|
if (size <= 0) {
|
|
size = BUF_DEF_SIZE;
|
|
}
|
|
bp->size = size;
|
|
bp->count = 0;
|
|
bp->buffer = bmake_malloc(size);
|
|
*bp->buffer = 0;
|
|
}
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Buf_Destroy --
|
|
* Nuke a buffer and all its resources.
|
|
*
|
|
* Input:
|
|
* buf Buffer to destroy
|
|
* freeData TRUE if the data should be destroyed
|
|
*
|
|
* Results:
|
|
* Data buffer, NULL if freed
|
|
*
|
|
* Side Effects:
|
|
* The buffer is freed.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
Byte *
|
|
Buf_Destroy(Buffer *buf, Boolean freeData)
|
|
{
|
|
Byte *data;
|
|
|
|
data = buf->buffer;
|
|
if (freeData) {
|
|
free(data);
|
|
data = NULL;
|
|
}
|
|
|
|
buf->size = 0;
|
|
buf->count = 0;
|
|
buf->buffer = NULL;
|
|
|
|
return data;
|
|
}
|
|
|
|
|
|
/*-
|
|
*-----------------------------------------------------------------------
|
|
* Buf_DestroyCompact --
|
|
* Nuke a buffer and return its data.
|
|
*
|
|
* Input:
|
|
* buf Buffer to destroy
|
|
*
|
|
* Results:
|
|
* Data buffer
|
|
*
|
|
* Side Effects:
|
|
* If the buffer size is much greater than its content,
|
|
* a new buffer will be allocated and the old one freed.
|
|
*
|
|
*-----------------------------------------------------------------------
|
|
*/
|
|
#ifndef BUF_COMPACT_LIMIT
|
|
# define BUF_COMPACT_LIMIT 128 /* worthwhile saving */
|
|
#endif
|
|
|
|
Byte *
|
|
Buf_DestroyCompact(Buffer *buf)
|
|
{
|
|
#if BUF_COMPACT_LIMIT > 0
|
|
Byte *data;
|
|
|
|
if (buf->size - buf->count >= BUF_COMPACT_LIMIT) {
|
|
/* We trust realloc to be smart */
|
|
data = bmake_realloc(buf->buffer, buf->count + 1);
|
|
if (data) {
|
|
data[buf->count] = 0;
|
|
Buf_Destroy(buf, FALSE);
|
|
return data;
|
|
}
|
|
}
|
|
#endif
|
|
return Buf_Destroy(buf, FALSE);
|
|
}
|