/* Copyright (C) 1989, 1996, 1997, 1998, 1999, 2001 artofcode LLC.  All rights reserved.
  
  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 of the License, 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.,
  59 Temple Place, Suite 330, Boston, MA, 02111-1307.

*/

/*$Id: imain.c,v 1.19.2.2.2.1 2003/01/17 00:49:04 giles Exp $ */
/* Common support for interpreter front ends */
#include "memory_.h"
#include "string_.h"
/* Capture stdin/out/err before gs.h redefines them. */
#include <stdio.h>
#include <stdlib.h>
private void
set_stdfiles(FILE * stdfiles[3])
{
    stdfiles[0] = stdin;
    stdfiles[1] = stdout;
    stdfiles[2] = stderr;
}
#include "ghost.h"
#include "gp.h"
#include "gscdefs.h"		/* for gs_init_file */
#include "gslib.h"
#include "gsmatrix.h"		/* for gxdevice.h */
#include "gsutil.h"		/* for bytes_compare */
#include "gxdevice.h"
#include "errors.h"
#include "oper.h"
#include "iconf.h"		/* for gs_init_* imports */
#include "idebug.h"
#include "idict.h"
#include "iname.h"		/* for name_init */
#include "dstack.h"
#include "estack.h"
#include "ostack.h"		/* put here for files.h */
#include "stream.h"		/* for files.h */
#include "files.h"
#include "ialloc.h"
#include "iinit.h"
#include "strimpl.h"		/* for sfilter.h */
#include "sfilter.h"		/* for iscan.h */
#include "iscan.h"
#include "main.h"
#include "store.h"
#include "isave.h"		/* for prototypes */
#include "interp.h"
#include "ivmspace.h"
#include "idisp.h"		/* for setting display device callback */

/* ------ Exported data ------ */

/* Define the default instance of the interpreter. */
/* Currently, this is the *only possible* instance, because most of */
/* the places that need to take an explicit instance argument don't. */
private gs_main_instance the_gs_main_instance;
gs_main_instance *
gs_main_instance_default(void)
{
    /* Determine whether the instance has been initialized. */
    if (the_gs_main_instance.memory_chunk_size == 0)
	the_gs_main_instance = gs_main_instance_init_values;
    return &the_gs_main_instance;
}

/* Define the interpreter's name table.  We'll move it somewhere better */
/* eventually.... */
name_table *the_gs_name_table;

/* ------ Forward references ------ */

private int gs_run_init_file(P3(gs_main_instance *, int *, ref *));
private void print_resource_usage(P3(const gs_main_instance *,
				     gs_dual_memory_t *,
				     const char *));

/* ------ Initialization ------ */

/* Save the real stdio files. */
void
gs_get_real_stdio(FILE * stdfiles[3])
{
    set_stdfiles(stdfiles);
}

/* Initialization to be done before anything else. */
int
gs_main_init0(gs_main_instance * minst, FILE * in, FILE * out, FILE * err,
	      int max_lib_paths)
{
    gs_memory_t *heap;
    ref *paths;

    /* Set our versions of stdin/out/err. */
    gs_stdin = minst->fstdin = in;
    gs_stdout = minst->fstdout = out;
    gs_stderr = minst->fstderr = err;
    /* Do platform-dependent initialization. */
    /* We have to do this as the very first thing, */
    /* because it detects attempts to run 80N86 executables (N>0) */
    /* on incompatible processors. */
    gp_init();
    gp_get_usertime(minst->base_time);
    /* Initialize the imager. */
    heap = gs_lib_init0(gs_stdout);
    if (heap == 0)
	return_error(e_VMerror);
    minst->heap = heap;
    /* Initialize the file search paths. */
    paths = (ref *) gs_alloc_byte_array(heap, max_lib_paths, sizeof(ref),
					"lib_path array");
    if (paths == 0) {
	gs_lib_finit(1, e_VMerror);
	return_error(e_VMerror);
    }
    make_array(&minst->lib_path.container, avm_foreign, max_lib_paths,
	       (ref *) gs_alloc_byte_array(heap, max_lib_paths, sizeof(ref),
					   "lib_path array"));
    make_array(&minst->lib_path.list, avm_foreign | a_readonly, 0,
	       minst->lib_path.container.value.refs);
    minst->lib_path.env = 0;
    minst->lib_path.final = 0;
    minst->lib_path.count = 0;
    minst->user_errors = 1;
    minst->init_done = 0;
    return 0;
}

/* Initialization to be done before constructing any objects. */
int
gs_main_init1(gs_main_instance * minst)
{
    if (minst->init_done < 1) {
	gs_dual_memory_t idmem;
	int code =
	    ialloc_init(&idmem, (gs_raw_memory_t *)&gs_memory_default,
			minst->memory_chunk_size, gs_have_level2());

	if (code < 0)
	    return code;
	code = gs_lib_init1((gs_memory_t *)idmem.space_system);
	if (code < 0)
	    return code;
	alloc_save_init(&idmem);
	{
	    gs_memory_t *mem = (gs_memory_t *)idmem.space_system;
	    name_table *nt = names_init(minst->name_table_size,
					idmem.space_system);

	    if (nt == 0)
		return_error(e_VMerror);
	    the_gs_name_table = nt;
	    code = gs_register_struct_root(mem, NULL,
					   (void **)&the_gs_name_table,
					   "the_gs_name_table");
	    if (code < 0)
		return code;
	}
	code = obj_init(&minst->i_ctx_p, &idmem);  /* requires name_init */
	if (code < 0)
	    return code;
	minst->init_done = 1;
    }
    return 0;
}

/* Initialization to be done before running any files. */
private void
init2_make_string_array(i_ctx_t *i_ctx_p, const ref * srefs, const char *aname)
{
    const ref *ifp = srefs;
    ref ifa;

    for (; ifp->value.bytes != 0; ifp++);
    make_tasv(&ifa, t_array, a_readonly | avm_foreign,
	      ifp - srefs, const_refs, srefs);
    initial_enter_name(aname, &ifa);
}

/*
 * Invoke the interpreter, handling stdio callouts
 * e_NeedStdin, e_NeedStdout and e_NeedStderr.
 * We don't yet pass callouts all the way out because they
 * occur within gs_main_init2() and swproc().
 */
private int
gs_main_interpret(gs_main_instance *minst, ref * pref, int user_errors, 
	int *pexit_code, ref * perror_object)
{
    i_ctx_t *i_ctx_p;
    ref refnul;
    ref refpop;
    int code;

    code = gs_interpret(&minst->i_ctx_p, pref, 
		user_errors, pexit_code, perror_object);
    while ((code == e_NeedStdin) || (code == e_NeedStdout) || 
	(code == e_NeedStderr)) {
        i_ctx_p = minst->i_ctx_p;
	if (code == e_NeedStdout) {
	    /*
	     * On entry:
	     *  esp[0]  = string, data to write to stdout
	     *  esp[-1] = bool, EOF (ignored)
	     *  esp[-2] = array, procedure (ignored)
	     *  esp[-3] = file, stdout stream
	     * We print the string then pop these 4 items.
	     */
	    if (r_type(&esp[0]) == t_string) {
		const char *str = (const char *)(esp[0].value.const_bytes); 
		int count = esp[0].tas.rsize;
		int rcode = 0;
		if (str != NULL)
		    rcode = gs_main_outwrite(minst, str, count);
		if (rcode < 0)
		    return_error(e_ioerror);
	    }

	    /* On return, we need to set 
	     *  osp[-1] = string buffer, 
	     *  osp[0] = file
	     */
	    gs_push_string(minst, (byte *)minst->stdout_buf, 
		sizeof(minst->stdout_buf), false);
	    gs_push_integer(minst, 0);	/* push integer */
	    osp[0] = esp[-3];		/* then replace with file */
	    /* remove items from execution stack */
	    esp -= 4;
	}
	else if (code == e_NeedStderr) {
	    if (r_type(&esp[0]) == t_string) {
		const char *str = (const char *)(esp[0].value.const_bytes); 
		int count = esp[0].tas.rsize;
		int rcode = 0;
		if (str != NULL)
		    rcode = gs_main_errwrite(minst, str, count);
		if (rcode < 0)
		    return_error(e_ioerror);
	    }
	    gs_push_string(minst, (byte *)minst->stderr_buf, 
		sizeof(minst->stderr_buf), false);
	    gs_push_integer(minst, 0);
	    osp[0] = esp[-3];
	    esp -= 4;
	}
	else if (code == e_NeedStdin) {
	    int count = sizeof(minst->stdin_buf);
	    /*
	     * On entry:
	     *  esp[0]  = array, procedure (ignored)
	     *  esp[-1] = file, stdin stream
	     * We read from stdin then pop these 2 items.
	     */
	    if (minst->stdin_fn)
		count = (*minst->stdin_fn)(minst->caller_handle, 
			minst->stdin_buf, count);
	    else
		count = gp_stdin_read(minst->stdin_buf, count, 
		    minst->stdin_is_interactive, minst->fstdin);
	    if (count < 0)
	        return_error(e_ioerror);

	    /* On return, we need to set 
	     *  osp[-1] = string buffer, 
	     *  osp[0] = file
	     */
	    gs_push_string(minst, (byte *)minst->stdin_buf, count, false);
	    gs_push_integer(minst, 0);	/* push integer */
	    osp[0] = esp[-1];		/* then replace with file */
	    /* remove items from execution stack */
	    esp -= 2;
	}
	/*
	 * To resume the interpreter, we call gs_interpret with a null ref.
	 * This copies the literal null onto the operand stack.
	 * To remove this we push a zpop onto the execution stack.
	 */
	make_null(&refnul);
	make_oper(&refpop, 0, zpop); 
	esp += 1;
	*esp = refpop;
	code = gs_interpret(&minst->i_ctx_p, &refnul, 
		    user_errors, pexit_code, perror_object);
    }
    return code;
}

int
gs_main_init2(gs_main_instance * minst)
{
    i_ctx_t *i_ctx_p;
    int code = gs_main_init1(minst);

    if (code < 0)
	return code;
    i_ctx_p = minst->i_ctx_p;
    if (minst->init_done < 2) {
	int code, exit_code;
	ref error_object;

	code = zop_init(i_ctx_p);
	if (code < 0)
	    return code;
	{
	    /*
	     * gs_iodev_init has to be called here (late), rather than
	     * with the rest of the library init procedures, because of
	     * some hacks specific to MS Windows for patching the
	     * stdxxx IODevices.
	     */
	    extern init_proc(gs_iodev_init);

	    code = gs_iodev_init(imemory);
	    if (code < 0)
		return code;
	}
	code = op_init(i_ctx_p);	/* requires obj_init */
	if (code < 0)
	    return code;

	/* Set up the array of additional initialization files. */
	init2_make_string_array(i_ctx_p, gs_init_file_array, "INITFILES");
	/* Set up the array of emulator names. */
	init2_make_string_array(i_ctx_p, gs_emulator_name_array, "EMULATORS");
	/* Pass the search path. */
	code = initial_enter_name("LIBPATH", &minst->lib_path.list);
	if (code < 0)
	    return code;

	/* Execute the standard initialization file. */
	code = gs_run_init_file(minst, &exit_code, &error_object);
	if (code < 0)
	    return code;
	minst->init_done = 2;
	i_ctx_p = minst->i_ctx_p; /* init file may change it */
	if (minst->display)
	    code = display_set_callback(minst, minst->display);
	if (code < 0)
	    return code;
    }
    if (gs_debug_c(':'))
	print_resource_usage(minst, &gs_imemory, "Start");
    gp_readline_init(&minst->readline_data, imemory_system);
    return 0;
}

/* ------ Search paths ------ */

/* Internal routine to add a set of directories to a search list. */
/* Returns 0 or an error code. */
private int
file_path_add(gs_file_path * pfp, const char *dirs)
{
    uint len = r_size(&pfp->list);
    const char *dpath = dirs;

    if (dirs == 0)
	return 0;
    for (;;) {			/* Find the end of the next directory name. */
	const char *npath = dpath;

	while (*npath != 0 && *npath != gp_file_name_list_separator)
	    npath++;
	if (npath > dpath) {
	    if (len == r_size(&pfp->container))
		return_error(e_limitcheck);
	    make_const_string(&pfp->container.value.refs[len],
			      avm_foreign | a_readonly,
			      npath - dpath, (const byte *)dpath);
	    ++len;
	}
	if (!*npath)
	    break;
	dpath = npath + 1;
    }
    r_set_size(&pfp->list, len);
    return 0;
}

/* Add a library search path to the list. */
int
gs_main_add_lib_path(gs_main_instance * minst, const char *lpath)
{
    /* Account for the possibility that the first element */
    /* is gp_current_directory name added by set_lib_paths. */
    int first_is_here =
	(r_size(&minst->lib_path.list) != 0 &&
	 minst->lib_path.container.value.refs[0].value.bytes ==
	 (const byte *)gp_current_directory_name ? 1 : 0);
    int code;

    r_set_size(&minst->lib_path.list, minst->lib_path.count +
	       first_is_here);
    code = file_path_add(&minst->lib_path, lpath);
    minst->lib_path.count = r_size(&minst->lib_path.list) - first_is_here;
    if (code < 0)
	return code;
    return gs_main_set_lib_paths(minst);
}

/* ------ Execution ------ */

/* Complete the list of library search paths. */
/* This may involve adding or removing the current directory */
/* as the first element. */
int
gs_main_set_lib_paths(gs_main_instance * minst)
{
    ref *paths = minst->lib_path.container.value.refs;
    int first_is_here =
	(r_size(&minst->lib_path.list) != 0 &&
	 paths[0].value.bytes == (const byte *)gp_current_directory_name ? 1 : 0);
    int count = minst->lib_path.count;
    int code = 0;

    if (minst->search_here_first) {
	if (!(first_is_here ||
	      (r_size(&minst->lib_path.list) != 0 &&
	       !bytes_compare((const byte *)gp_current_directory_name,
			      strlen(gp_current_directory_name),
			      paths[0].value.bytes,
			      r_size(&paths[0]))))
	    ) {
	    memmove(paths + 1, paths, count * sizeof(*paths));
	    make_const_string(paths, avm_foreign | a_readonly,
			      strlen(gp_current_directory_name),
			      (const byte *)gp_current_directory_name);
	}
    } else {
	if (first_is_here)
	    memmove(paths, paths + 1, count * sizeof(*paths));
    }
    r_set_size(&minst->lib_path.list,
	       count + (minst->search_here_first ? 1 : 0));
    if (minst->lib_path.env != 0)
	code = file_path_add(&minst->lib_path, minst->lib_path.env);
    if (minst->lib_path.final != 0 && code >= 0)
	code = file_path_add(&minst->lib_path, minst->lib_path.final);
    return code;
}

/* Open a file, using the search paths. */
int
gs_main_lib_open(gs_main_instance * minst, const char *file_name, ref * pfile)
{
    /* This is a separate procedure only to avoid tying up */
    /* extra stack space while running the file. */
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
#define maxfn 200
    byte fn[maxfn];
    uint len;

    return lib_file_open(file_name, strlen(file_name), fn, maxfn,
			 &len, pfile, imemory);
}

/* Open and execute a file. */
int
gs_main_run_file(gs_main_instance * minst, const char *file_name, int user_errors, int *pexit_code, ref * perror_object)
{
    ref initial_file;
    int code = gs_main_run_file_open(minst, file_name, &initial_file);

    if (code < 0)
	return code;
    return gs_main_interpret(minst, &initial_file, user_errors,
			pexit_code, perror_object);
}
int
gs_main_run_file_open(gs_main_instance * minst, const char *file_name, ref * pfref)
{
    gs_main_set_lib_paths(minst);
    if (gs_main_lib_open(minst, file_name, pfref) < 0) {
	eprintf1("Can't find initialization file %s.\n", file_name);
	return_error(e_Fatal);
    }
    r_set_attrs(pfref, a_execute + a_executable);
    return 0;
}

/* Open and run the very first initialization file. */
private int
gs_run_init_file(gs_main_instance * minst, int *pexit_code, ref * perror_object)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref ifile;
    ref first_token;
    int code;
    scanner_state state;

    gs_main_set_lib_paths(minst);
    if (gs_init_string_sizeof == 0) {	/* Read from gs_init_file. */
	code = gs_main_run_file_open(minst, gs_init_file, &ifile);
    } else {			/* Read from gs_init_string. */
	code = file_read_string(gs_init_string, gs_init_string_sizeof, &ifile,
				iimemory);
    }
    if (code < 0) {
	*pexit_code = 255;
	return code;
    }
    /* Check to make sure the first token is an integer */
    /* (for the version number check.) */
    scanner_state_init(&state, false);
    code = scan_token(i_ctx_p, ifile.value.pfile, &first_token,
		      &state);
    if (code != 0 || !r_has_type(&first_token, t_integer)) {
	eprintf1("Initialization file %s does not begin with an integer.\n", gs_init_file);
	*pexit_code = 255;
	return_error(e_Fatal);
    }
    *++osp = first_token;
    r_set_attrs(&ifile, a_executable);
    return gs_main_interpret(minst, &ifile, minst->user_errors,
			pexit_code, perror_object);
}

/* Run a string. */
int
gs_main_run_string(gs_main_instance * minst, const char *str, int user_errors,
		   int *pexit_code, ref * perror_object)
{
    return gs_main_run_string_with_length(minst, str, (uint) strlen(str),
					  user_errors,
					  pexit_code, perror_object);
}
int
gs_main_run_string_with_length(gs_main_instance * minst, const char *str,
	 uint length, int user_errors, int *pexit_code, ref * perror_object)
{
    int code;

    code = gs_main_run_string_begin(minst, user_errors,
				    pexit_code, perror_object);
    if (code < 0)
	return code;
    code = gs_main_run_string_continue(minst, str, length, user_errors,
				       pexit_code, perror_object);
    if (code != e_NeedInput)
	return code;
    return gs_main_run_string_end(minst, user_errors,
				  pexit_code, perror_object);
}

/* Set up for a suspendable run_string. */
int
gs_main_run_string_begin(gs_main_instance * minst, int user_errors,
			 int *pexit_code, ref * perror_object)
{
    const char *setup = ".runstringbegin";
    ref rstr;
    int code;

    gs_main_set_lib_paths(minst);
    make_const_string(&rstr, avm_foreign | a_readonly | a_executable,
		      strlen(setup), (const byte *)setup);
    code = gs_main_interpret(minst, &rstr, user_errors, pexit_code,
			perror_object);
    return (code == e_NeedInput ? 0 : code == 0 ? e_Fatal : code);
}
/* Continue running a string with the option of suspending. */
int
gs_main_run_string_continue(gs_main_instance * minst, const char *str,
	 uint length, int user_errors, int *pexit_code, ref * perror_object)
{
    ref rstr;

    if (length == 0)
	return 0;		/* empty string signals EOF */
    make_const_string(&rstr, avm_foreign | a_readonly, length,
		      (const byte *)str);
    return gs_main_interpret(minst, &rstr, user_errors, pexit_code,
			perror_object);
}
/* Signal EOF when suspended. */
int
gs_main_run_string_end(gs_main_instance * minst, int user_errors,
		       int *pexit_code, ref * perror_object)
{
    ref rstr;

    make_empty_const_string(&rstr, avm_foreign | a_readonly);
    return gs_main_interpret(minst, &rstr, user_errors, pexit_code,
			perror_object);
}

/* ------ Operand stack access ------ */

/* These are built for comfort, not for speed. */

private int
push_value(gs_main_instance *minst, ref * pvalue)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    int code = ref_stack_push(&o_stack, 1);

    if (code < 0)
	return code;
    *ref_stack_index(&o_stack, 0L) = *pvalue;
    return 0;
}

int
gs_push_boolean(gs_main_instance * minst, bool value)
{
    ref vref;

    make_bool(&vref, value);
    return push_value(minst, &vref);
}

int
gs_push_integer(gs_main_instance * minst, long value)
{
    ref vref;

    make_int(&vref, value);
    return push_value(minst, &vref);
}

int
gs_push_real(gs_main_instance * minst, floatp value)
{
    ref vref;

    make_real(&vref, value);
    return push_value(minst, &vref);
}

int
gs_push_string(gs_main_instance * minst, byte * chars, uint length,
	       bool read_only)
{
    ref vref;

    make_string(&vref, avm_foreign | (read_only ? a_readonly : a_all),
		length, (byte *) chars);
    return push_value(minst, &vref);
}

private int
pop_value(i_ctx_t *i_ctx_p, ref * pvalue)
{
    if (!ref_stack_count(&o_stack))
	return_error(e_stackunderflow);
    *pvalue = *ref_stack_index(&o_stack, 0L);
    return 0;
}

int
gs_pop_boolean(gs_main_instance * minst, bool * result)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref vref;
    int code = pop_value(i_ctx_p, &vref);

    if (code < 0)
	return code;
    check_type_only(vref, t_boolean);
    *result = vref.value.boolval;
    ref_stack_pop(&o_stack, 1);
    return 0;
}

int
gs_pop_integer(gs_main_instance * minst, long *result)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref vref;
    int code = pop_value(i_ctx_p, &vref);

    if (code < 0)
	return code;
    check_type_only(vref, t_integer);
    *result = vref.value.intval;
    ref_stack_pop(&o_stack, 1);
    return 0;
}

int
gs_pop_real(gs_main_instance * minst, float *result)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref vref;
    int code = pop_value(i_ctx_p, &vref);

    if (code < 0)
	return code;
    switch (r_type(&vref)) {
	case t_real:
	    *result = vref.value.realval;
	    break;
	case t_integer:
	    *result = (float)(vref.value.intval);
	    break;
	default:
	    return_error(e_typecheck);
    }
    ref_stack_pop(&o_stack, 1);
    return 0;
}

int
gs_pop_string(gs_main_instance * minst, gs_string * result)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref vref;
    int code = pop_value(i_ctx_p, &vref);

    if (code < 0)
	return code;
    switch (r_type(&vref)) {
	case t_name:
	    name_string_ref(&vref, &vref);
	    code = 1;
	    goto rstr;
	case t_string:
	    code = (r_has_attr(&vref, a_write) ? 0 : 1);
	  rstr:result->data = vref.value.bytes;
	    result->size = r_size(&vref);
	    break;
	default:
	    return_error(e_typecheck);
    }
    ref_stack_pop(&o_stack, 1);
    return code;
}

/* ------ Termination ------ */

/* Get the names of temporary files.
 * Each name is null terminated, and the last name is 
 * terminated by a double null.
 * We retrieve the names of temporary files just before
 * the interpreter finishes, and then delete the files 
 * after the interpreter has closed all files.
 */
private char *gs_main_tempnames(gs_main_instance *minst)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    ref *SAFETY;
    ref *tempfiles;
    ref keyval[2];	/* for key and value */
    char *tempnames = NULL;
    int i;
    int idict;
    int len = 0;
    const byte *data = NULL;
    uint size;
    if (minst->init_done >= 2) {
        if (dict_find_string(systemdict, "SAFETY", &SAFETY) <= 0 ||
	    dict_find_string(SAFETY, "tempfiles", &tempfiles) <= 0)
	    return NULL;
	/* get lengths of temporary filenames */
	idict = dict_first(tempfiles);
	while ((idict = dict_next(tempfiles, idict, &keyval[0])) >= 0) {
	    if (obj_string_data(&keyval[0], &data, &size) >= 0)
		len += size + 1;
	}
	if (len != 0)
	    tempnames = (char *)malloc(len+1);
	if (tempnames) {
	    memset(tempnames, 0, len+1);
	    /* copy temporary filenames */
	    idict = dict_first(tempfiles);
	    i = 0;
	    while ((idict = dict_next(tempfiles, idict, &keyval[0])) >= 0) {
		if (obj_string_data(&keyval[0], &data, &size) >= 0) {
		    memcpy(tempnames+i, (char *)data, size);
		    i+= size;
		    tempnames[i++] = '\0';
		}
	    }
	}
    }
    return tempnames;
}

/* Free all resources and exit. */
void
gs_main_finit(gs_main_instance * minst, int exit_status, int code)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;
    int exit_code;
    ref error_object;
    char *tempnames;

    /*
     * Previous versions of this code closed the devices in the
     * device list here.  Since these devices are now prototypes,
     * they cannot be opened, so they do not need to be closed;
     * alloc_restore_all will close dynamically allocated devices.
     */
    tempnames = gs_main_tempnames(minst);
    /* Flush stdout and stderr */
    if (minst->init_done >= 2)
      gs_main_run_string(minst, 
	"(%stdout) (w) file closefile (%stderr) (w) file closefile quit",
	0 , &exit_code, &error_object);
    gp_readline_finit(minst->readline_data);
    if (gs_debug_c(':'))
	print_resource_usage(minst, &gs_imemory, "Final");
    /* Do the equivalent of a restore "past the bottom". */
    /* This will release all memory, close all open files, etc. */
    if (minst->init_done >= 1)
	alloc_restore_all(idmemory);
    /* clean up redirected stdout */
    if (minst->fstdout2 && (minst->fstdout2 != minst->fstdout)
	    && (minst->fstdout2 != minst->fstderr)) {
	fclose(minst->fstdout2);
	minst->fstdout2 = (FILE *)NULL;
    }
    minst->stdout_is_redirected = 0;
    minst->stdout_to_stderr = 0;
    /* remove any temporary files, after ghostscript has closed files */
    if (tempnames) {
	char *p = tempnames;
	while (*p) {
	    unlink(p);
	    p += strlen(p) + 1;
	}
	free(tempnames);
    }
    gs_lib_finit(exit_status, code);
}
void
gs_exit_with_code(int exit_status, int code)
{
    gs_finit(exit_status, code);
    gp_do_exit(exit_status);
}
void
gs_exit(int exit_status)
{
    gs_exit_with_code(exit_status, 0);
}

void
gs_abort(void)
{
    gs_exit(1);
    /* This is the ONLY reference to exit() */
    /* Even this one should be removed */
    exit(1);	
}

/* ------ Debugging ------ */

/* Print resource usage statistics. */
private void
print_resource_usage(const gs_main_instance * minst, gs_dual_memory_t * dmem,
		     const char *msg)
{
    ulong allocated = 0, used = 0;
    long utime[2];

    gp_get_usertime(utime);
    {
	int i;

	for (i = 0; i < countof(dmem->spaces_indexed); ++i) {
	    gs_ref_memory_t *mem = dmem->spaces_indexed[i];

	    if (mem != 0 && (i == 0 || mem != dmem->spaces_indexed[i - 1])) {
		gs_memory_status_t status;
		gs_ref_memory_t *mem_stable =
		    (gs_ref_memory_t *)gs_memory_stable((gs_memory_t *)mem);

		gs_memory_status((gs_memory_t *)mem, &status);
		allocated += status.allocated;
		used += status.used;
		if (mem_stable != mem) {
		    gs_memory_status((gs_memory_t *)mem_stable, &status);
		    allocated += status.allocated;
		    used += status.used;
		}
	    }
	}
    }
    dprintf4("%% %s time = %g, memory allocated = %lu, used = %lu\n",
	     msg, utime[0] - minst->base_time[0] +
	     (utime[1] - minst->base_time[1]) / 1000000000.0,
	     allocated, used);
}

/* Dump the stacks after interpretation */
void
gs_main_dump_stack(gs_main_instance *minst, int code, ref * perror_object)
{
    i_ctx_t *i_ctx_p = minst->i_ctx_p;

    zflush(i_ctx_p);		/* force out buffered output */
    dprintf1("\nUnexpected interpreter error %d.\n", code);
    if (perror_object != 0) {
	dputs("Error object: ");
	debug_print_ref(perror_object);
	dputc('\n');
    }
    debug_dump_stack(&o_stack, "Operand stack");
    debug_dump_stack(&e_stack, "Execution stack");
    debug_dump_stack(&d_stack, "Dictionary stack");
}
/* Backward compatibility */
void
gs_debug_dump_stack(int code, ref * perror_object)
{
    gs_main_dump_stack(gs_main_instance_default(), code, perror_object);
}


/* Provide a single point for all "C" stdout and stderr.
 * Eventually these will always be referenced through an instance structure. 
 * We don't know which instance is running (and currently only one
 * instance is possible) so use the default instance.
 */

int
gs_main_outwrite(gs_main_instance *minst, const char *str, int len)
{
    int code;
    FILE *fout;
    if (len == 0)
	return 0;
    if (minst->stdout_is_redirected) {
	if (minst->stdout_to_stderr)
	    return gs_main_errwrite(minst, str, len);
	fout = minst->fstdout2;
    }
    else if (minst->stdout_fn) {
	return (*minst->stdout_fn)(minst->caller_handle, str, len);
    }
    else {
	fout = minst->fstdout;
    }
    code = fwrite(str, 1, len, fout);
    fflush(fout);
    return code;
}

int
gs_main_errwrite(gs_main_instance *minst, const char *str, int len)
{
    int code;
    if (len == 0)
	return 0;
    if (minst->stderr_fn)
	return (*minst->stderr_fn)(minst->caller_handle, str, len);
    code = fwrite(str, 1, len, minst->fstderr);
    fflush(minst->fstderr);
    return code;
}

int outwrite(const char *str, int len)
{
    return gs_main_outwrite(gs_main_instance_default(), str, len);
}

int errwrite(const char *str, int len)
{
    return gs_main_errwrite(gs_main_instance_default(), str, len);
}

void outflush(void)
{
    gs_main_instance * minst = gs_main_instance_default();
    if (minst->stdout_is_redirected) {
	if (minst->stdout_to_stderr) {
	    if (!minst->stderr_fn)
		fflush(minst->fstderr);
	}
	else
	    fflush(minst->fstdout2);
    }
    else if (!minst->stdout_fn)
        fflush(minst->fstdout);
}

void errflush(void)
{
    gs_main_instance * minst = gs_main_instance_default();
    if (!minst->stderr_fn)
        fflush(minst->fstderr);
}