/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gdevpipe.c 8022 2007-06-05 22:23:38Z giles $ */
/* %pipe% IODevice */
#include "errno_.h"
#include "pipe_.h"
#include "stdio_.h"
#include "string_.h"
#include "gserror.h"
#include "gserrors.h"
#include "gstypes.h"
#include "gsmemory.h"		/* for gxiodev.h */
#include "gxiodev.h"

/* The pipe IODevice */
private iodev_proc_fopen(pipe_fopen);
private iodev_proc_fclose(pipe_fclose);
const gx_io_device gs_iodev_pipe = {
    "%pipe%", "Special",
    {iodev_no_init, iodev_no_open_device,
     NULL /*iodev_os_open_file */ , pipe_fopen, pipe_fclose,
     iodev_no_delete_file, iodev_no_rename_file, iodev_no_file_status,
     iodev_no_enumerate_files, NULL, NULL,
     iodev_no_get_params, iodev_no_put_params
    }
};

/* The file device procedures */

private int
pipe_fopen(gx_io_device * iodev, const char *fname, const char *access,
	   FILE ** pfile, char *rfname, uint rnamelen)
{
    errno = 0;
    /*
     * Some platforms allow opening a pipe with a '+' in the access
     * mode, even though pipes are not positionable.  Detect this here.
     */
    if (strchr(access, '+'))
	return_error(gs_error_invalidfileaccess);
    /*
     * The OSF/1 1.3 library doesn't include const in the
     * prototype for popen, so we have to break const here.
     */
    *pfile = popen((char *)fname, (char *)access);
    if (*pfile == NULL)
	return_error(gs_fopen_errno_to_code(errno));
    if (rfname != NULL)
	strcpy(rfname, fname);
    return 0;
}

private int
pipe_fclose(gx_io_device * iodev, FILE * file)
{
    pclose(file);
    return 0;
}