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/*
* This file is part of libtrace
*
* Copyright (c) 2007,2008,2009,2010 The University of Waikato, Hamilton,
* New Zealand.
*
* Authors: Daniel Lawson
* Perry Lorier
* Shane Alcock
*
* All rights reserved.
*
* This code has been developed by the University of Waikato WAND
* research group. For further information please see http://www.wand.net.nz/
*
* libtrace 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 2 of the License, or
* (at your option) any later version.
*
* libtrace 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 libtrace; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: ior-stdio.c 1548 2010-03-23 00:08:46Z yww4 $
*
*/
#define _GNU_SOURCE 1
#include "wandio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
/* Libtrace IO module implementing a standard IO reader, i.e. no decompression
*/
struct stdio_t {
int fd;
};
extern io_source_t stdio_source;
#define DATA(io) ((struct stdio_t *)((io)->data))
io_t *stdio_open(const char *filename)
{
io_t *io = malloc(sizeof(io_t));
io->data = malloc(sizeof(struct stdio_t));
if (strcmp(filename,"-") == 0)
DATA(io)->fd = 0; /* STDIN */
else
DATA(io)->fd = open(filename,
O_RDONLY
#ifdef O_DIRECT
|(force_directio_read?O_DIRECT:0)
#endif
);
io->source = &stdio_source;
if (DATA(io)->fd == -1) {
free(io);
return NULL;
}
return io;
}
static off_t stdio_read(io_t *io, void *buffer, off_t len)
{
return read(DATA(io)->fd,buffer,len);
}
static off_t stdio_tell(io_t *io)
{
return lseek(DATA(io)->fd, 0, SEEK_CUR);
}
static off_t stdio_seek(io_t *io, off_t offset, int whence)
{
return lseek(DATA(io)->fd, offset, whence);
}
static void stdio_close(io_t *io)
{
close(DATA(io)->fd);
free(io->data);
free(io);
}
io_source_t stdio_source = {
"stdio",
stdio_read,
NULL,
stdio_tell,
stdio_seek,
stdio_close
};
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