File: dxmainc.c

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/* 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: dxmainc.c 9085 2008-09-13 20:22:25Z giles $ */

/* 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;
}