gambas-source-code/main/gbx/gbx_stream_process.c

/***************************************************************************

	gbx_stream_process.c

	(c) 2000-2017 Benoît Minisini <g4mba5@gmail.com>

	This program 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, or (at your option)
	any later version.

	This program 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 this program; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	MA 02110-1301, USA.

***************************************************************************/

#define __STREAM_IMPL_C

#include "gb_common.h"
#include "gb_error.h"
#include "gbx_value.h"
#include "gb_limit.h"

#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>

#include "gbx_c_process.h"

#include "gbx_stream.h"


#define FDR ((CPROCESS *)stream->process.process)->out
#define FDW ((CPROCESS *)stream->process.process)->in


static int stream_open(STREAM *stream, const char *path, int mode, CPROCESS *process)
{
	stream->process.process = process;
	STREAM_blocking(stream, FALSE);
	return FALSE;
}


static int stream_close(STREAM *stream)
{
	if (FDW >= 0)
	{
		if (close(FDW) < 0)
			return TRUE;

		FDW = -1;
	}

	return FALSE;
}


static int stream_read(STREAM *stream, char *buffer, int len)
{
	return read(FDR, buffer, len);
}

static int stream_write(STREAM *stream, char *buffer, int len)
{
	return write(FDW, buffer, len);
}


static int stream_seek(STREAM *stream, int64_t pos, int whence)
{
	if (FDR < 0)
		return TRUE;

	return (lseek(FDR, pos, whence) < 0);
}


static int stream_tell(STREAM *stream, int64_t *pos)
{
	if (FDR < 0)
		return TRUE;

	*pos = lseek(FDR, 0, SEEK_CUR);
	return (*pos < 0);
}


static int stream_flush(STREAM *stream)
{
	return FALSE;
}


#define stream_eof NULL


#define stream_lof NULL


static int stream_handle(STREAM *stream)
{
	return FDR;
}


DECLARE_STREAM(STREAM_process);