gem5/base/circlebuf.cc
Ali Saidi 2f316082e4 Updated Copyright with information in bitkeeper changelogs
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base/circlebuf.cc:
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    Updated Copyright
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    This code isn't ours, and shouldn't have our copyright

--HG--
extra : convert_revision : 598f2e5eab5d5d3de2c1e862b389086e3212f7c4
2004-06-08 13:37:27 -04:00

213 lines
4.9 KiB
C++

/*
* Copyright (c) 2002-2003 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*/
#include <algorithm>
#include <string>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "base/circlebuf.hh"
#include "base/cprintf.hh"
#include "base/intmath.hh"
using namespace std;
CircleBuf::CircleBuf(int l)
: _rollover(false), _buflen(l), _size(0), _start(0), _stop(0)
{
_buf = new char[_buflen];
}
CircleBuf::~CircleBuf()
{
if (_buf)
delete [] _buf;
}
void
CircleBuf::dump()
{
cprintf("start = %10d, stop = %10d, buflen = %10d\n",
_start, _stop, _buflen);
fflush(stdout);
::write(STDOUT_FILENO, _buf, _buflen);
::write(STDOUT_FILENO, "<\n", 2);
}
void
CircleBuf::flush()
{
_start = 0;
_stop = 0;
_rollover = false;
}
void
CircleBuf::read(char *b, int len)
{
_size -= len;
if (_size < 0)
_size = 0;
if (_stop > _start) {
len = min(len, _stop - _start);
memcpy(b, _buf + _start, len);
_start += len;
}
else {
int endlen = _buflen - _start;
if (endlen > len) {
memcpy(b, _buf + _start, len);
_start += len;
}
else {
memcpy(b, _buf + _start, endlen);
_start = min(len - endlen, _stop);
memcpy(b + endlen, _buf, _start);
}
}
}
void
CircleBuf::read(int fd, int len)
{
_size -= len;
if (_size < 0)
_size = 0;
if (_stop > _start) {
len = min(len, _stop - _start);
::write(fd, _buf + _start, len);
_start += len;
}
else {
int endlen = _buflen - _start;
if (endlen > len) {
::write(fd, _buf + _start, len);
_start += len;
}
else {
::write(fd, _buf + _start, endlen);
_start = min(len - endlen, _stop);
::write(fd, _buf, _start);
}
}
}
void
CircleBuf::read(int fd)
{
_size = 0;
if (_stop > _start) {
::write(fd, _buf + _start, _stop - _start);
}
else {
::write(fd, _buf + _start, _buflen - _start);
::write(fd, _buf, _stop);
}
_start = _stop;
}
void
CircleBuf::read(ostream &out)
{
_size = 0;
if (_stop > _start) {
out.write(_buf + _start, _stop - _start);
}
else {
out.write(_buf + _start, _buflen - _start);
out.write(_buf, _stop);
}
_start = _stop;
}
void
CircleBuf::readall(int fd)
{
if (_rollover)
::write(fd, _buf + _stop, _buflen - _stop);
::write(fd, _buf, _stop);
_start = _stop;
}
void
CircleBuf::write(char b)
{
write(&b, 1);
}
void
CircleBuf::write(const char *b)
{
write(b, strlen(b));
}
void
CircleBuf::write(const char *b, int len)
{
if (len <= 0)
return;
_size += len;
if (_size > _buflen)
_size = _buflen;
int old_start = _start;
int old_stop = _stop;
if (len >= _buflen) {
_start = 0;
_stop = _buflen;
_rollover = true;
memcpy(_buf, b + (len - _buflen), _buflen);
return;
}
if (_stop + len <= _buflen) {
memcpy(_buf + _stop, b, len);
_stop += len;
} else {
int end_len = _buflen - old_stop;
_stop = len - end_len;
memcpy(_buf + old_stop, b, end_len);
memcpy(_buf, b + end_len, _stop);
_rollover = true;
}
if (old_start > old_stop && old_start < _stop ||
old_start < old_stop && _stop < old_stop)
_start = _stop + 1;
}