/* Copyright (C) 1995, 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: iminst.h,v 1.5.2.1.2.1 2003/01/17 00:49:04 giles Exp $ */
/* Definition of interpreter instance */
/* Requires stdio_.h, gsmemory.h, iref.h, iapi.h */

#ifndef iminst_INCLUDED
#  define iminst_INCLUDED

#ifndef gs_main_instance_DEFINED
#  define gs_main_instance_DEFINED
typedef struct gs_main_instance_s gs_main_instance;
#endif

/*
 * Define the structure of a search path.  Currently there is only one,
 * but there might be more someday.
 *
 *      container - an array large enough to hold the specified maximum
 * number of directories.  Both the array and all the strings in it are
 * in the 'foreign' VM space.
 *      list - the initial interval of container that defines the actual
 * search list.
 *      env - the contents of an environment variable, implicitly added
 * at the end of the list; may be 0.
 *      final - the final set of directories specified in the makefile;
 * may be 0.
 *      count - the number of elements in the list, excluding a possible
 * initial '.', env, and final.
 */
typedef struct gs_file_path_s {
    ref container;
    ref list;
    const char *env;
    const char *final;
    uint count;
} gs_file_path;

/* buffer sizes for stdio */
#define STDIN_BUF_SIZE 128
#define STDOUT_BUF_SIZE 128
#define STDERR_BUF_SIZE 128

/*
 * Here is where we actually define the structure of interpreter instances.
 * Clients should not reference any of the members.  Note that in order to
 * be able to initialize this structure statically, members including
 * unions must come last (and be initialized to 0 by default).
 */
struct gs_main_instance_s {
    /* The following are set during initialization. */
    FILE *fstdin;
    FILE *fstdout;
    FILE *fstderr;
    FILE *fstdout2;		/* for redirecting %stdout and diagnostics */
    bool stdout_is_redirected;	/* to stderr or fstdout2 */
    bool stdout_to_stderr;
    bool stdin_is_interactive;
    gs_memory_t *heap;		/* (C) heap allocator */
    uint memory_chunk_size;	/* 'wholesale' allocation unit */
    ulong name_table_size;
    uint run_buffer_size;
    int init_done;		/* highest init done so far */
    int user_errors;		/* define what to do with errors */
    bool search_here_first;	/* if true, make '.' first lib dir */
    bool run_start;		/* if true, run 'start' after */
				/* processing command line */
    gs_file_path lib_path;	/* library search list (GS_LIB) */
    long base_time[2];		/* starting usertime */
    void *readline_data;	/* data for gp_readline */
    char stdin_buf[STDIN_BUF_SIZE];	/* for e_NeedStdin callout */
    char stdout_buf[STDOUT_BUF_SIZE];	/* for e_NeedStdout callout */
    char stderr_buf[STDERR_BUF_SIZE];	/* for e_NeedStderr callout */
    ref error_object;		/* Use by gsapi_*() */
    void *caller_handle;	/* identifies caller of GS DLL/shared object */
    int (GSDLLCALL *stdin_fn)(void *caller_handle, char *buf, int len);
    int (GSDLLCALL *stdout_fn)(void *caller_handle, const char *str, int len);
    int (GSDLLCALL *stderr_fn)(void *caller_handle, const char *str, int len);
    int (GSDLLCALL *poll_fn)(void *caller_handle);
    display_callback *display;	/* callback structure for display device */
    /* The following are updated dynamically. */
    i_ctx_t *i_ctx_p;		/* current interpreter context state */
};

/*
 * Note that any file that uses the following definition of default values
 * must include gconfig.h, because of SEARCH_HERE_FIRST.
 */
#define gs_main_instance_default_init_values\
  0, 0, 0, 0, 0, 0 ,1 /*true*/, 0, 20000, 0, 0, -1, 0, SEARCH_HERE_FIRST, 1
extern const gs_main_instance gs_main_instance_init_values;

#endif /* iminst_INCLUDED */