/* Copyright (C) 2001-2006 artofcode LLC.
   All Rights Reserved.
  
  This file is part of GNU ghostscript

  GNU ghostscript is free software; you can redistribute it and/or
  modify it under the terms of the version 2 of the GNU General Public
  License as published by the Free Software Foundation.

  GNU ghostscript 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
  ghostscript; see the file COPYING. If not, write to the Free Software Foundation,
  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

*/
/* $Id: dxmainc.c,v 1.8 2007/08/01 14:25:44 jemarch Exp $ */

/* dxmainc.c */
/* 
 * Ghostscript frontend which provides a console to the Ghostscript
 * shared library.  Load time linking to libgs.so 
 * This does not support the display device.  Use dxmain.c/gsx for that,
 * or modify this program to use bare Xlib calls.
 * Compile using
 *    gcc -o gsc dxmainc.c -lgs
 *
 * The ghostscript library needs to be compiled with
 *  gcc -fPIC -g -c -Wall file.c
 *  gcc -shared -Wl,-soname,libgs.so.7 -o libgs.so.7.00 file.o -lc
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#define __PROTOTYPES__
#include "ierrors.h"
#include "iapi.h"

const char start_string[] = "systemdict /start get exec\n";

static int gsdll_stdin(void *instance, char *buf, int len);
static int gsdll_stdout(void *instance, const char *str, int len);
static int gsdll_stdout(void *instance, const char *str, int len);

/*********************************************************************/
/* stdio functions */

/* callback for reading stdin */
/* Use async input */
static int 
gsdll_stdin(void *instance, char *buf, int len)
{
    return read(fileno(stdin), buf, len);
}

static int 
gsdll_stdout(void *instance, const char *str, int len)
{
    fwrite(str, 1, len, stdout);
    fflush(stdout);
    return len;
}

static int 
gsdll_stderr(void *instance, const char *str, int len)
{
    fwrite(str, 1, len, stderr);
    fflush(stderr);
    return len;
}

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

int main(int argc, char *argv[])
{
    int exit_status;
    int code = 1, code1;
    void *instance;
    int exit_code;

    /* run Ghostscript */
    if ((code = gsapi_new_instance(&instance, NULL)) == 0) {
        gsapi_set_stdio(instance, gsdll_stdin, gsdll_stdout, gsdll_stderr);
	code = gsapi_init_with_args(instance, argc, argv);

	if (code == 0)
	    code = gsapi_run_string(instance, start_string, 0, &exit_code);
        code1 = gsapi_exit(instance);
	if (code == 0 || code == e_Quit)
	    code = code1;
	if (code == e_Quit)
	    code = 0;	/* user executed 'quit' */

	gsapi_delete_instance(instance);
    }

    exit_status = 0;
    switch (code) {
	case 0:
	case e_Info:
	case e_Quit:
	    break;
	case e_Fatal:
	    exit_status = 1;
	    break;
	default:
	    exit_status = 255;
    }

    return exit_status;
}

