File: gs.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: gs.c 9043 2008-08-28 22:48:19Z giles $ */
/* 'main' program for Ghostscript */
#include "ghost.h"
#include "imain.h"
#include "imainarg.h"
#include "iapi.h"
#include "iminst.h"
#include "ierrors.h"
#include "gsmalloc.h"

#ifdef __GNUC__
#  if (__GNUC__ == 2 && __GNUC_MINOR__ == 96)
#    define NEED_COMMIT_STACK 1
#  endif
#endif


/* Define an optional array of strings for testing. */
/*#define RUN_STRINGS */
#ifdef RUN_STRINGS
static const char *run_strings[] =
{
    "2 vmreclaim /SAVE save def 2 vmreclaim",
    "(saved\n) print flush",
    "SAVE restore (restored\n) print flush 2 vmreclaim",
    "(done\n) print flush quit",
    0
};

#endif

#ifdef NEED_COMMIT_STACK
/* 
 * It is well known that GCC 2.96 for x86 sometimes forgets to adjust $esp
 * and leaves automatic variables at small distance below the stack pointer.
 * Apparently, when the access to the automatic variable causes a page fault
 * Linux sends a SEGV signal if the access happens below the stack pointer.
 * Pre-loading the stack pages resolves the problem.
 */
static void 
commit_stack_pages( void )
{
    char buf[65536]; /* In most cases GS lives in 64K stack */
    int i;
    for ( i = 0; i < sizeof(buf) - 1; i += 1024)
        buf[i] = 0;
}
#endif


int
main(int argc, char *argv[])
{
    int exit_status, code;
    gs_main_instance *minst;
    gs_memory_t *mem;

#ifdef NEED_COMMIT_STACK   /* hack for bug in gcc 2.96 */
    commit_stack_pages();
#endif
    exit_status = 0;
    mem = gs_malloc_init(NULL);
    minst = gs_main_alloc_instance(mem);
    code = gs_main_init_with_args(minst, argc, argv);
    
#ifdef RUN_STRINGS
    {				/* Run a list of strings (for testing). */
	const char **pstr = run_strings;

	for (; *pstr; ++pstr) {
	    int exit_code;
	    ref error_object;
	    int code;

	    fprintf(stdout, "{%s} =>\n", *pstr);
	    fflush(stdout);
	    code = gs_main_run_string(minst, *pstr, 0,
				      &exit_code, &error_object);
	    zflush(osp);
	    fprintf(stdout, " => code = %d\n", code);
	    fflush(stdout);
	    if (code < 0) {
		gs_to_exit(1);
		return 1;
	    }
	}
    }
#endif

    if (code >= 0)
	code = gs_main_run_start(minst);

    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;
    }

    gs_to_exit_with_code(minst->heap, exit_status, code);
    gs_malloc_release(mem);

    switch (exit_status) {
	case 0:
	    exit_status =  exit_OK;
	    break;
	case 1:
	    exit_status =  exit_FAILED;
	    break;
    }
    return exit_status;
}