/* shell.h -- The data structures used by the shell */

/* Copyright (C) 1993 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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, or (at your option) any later
   version.

   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "config.h"
#include "command.h"
#include "general.h"
#include "error.h"
#include "variables.h"
#include "quit.h"
#include "maxpath.h"
#include "unwind_prot.h"
#include "dispose_cmd.h"
#include "make_cmd.h"
#include "subst.h"
#include "externs.h"

extern int EOF_Reached;

#define NO_PIPE -1
#define REDIRECT_BOTH -2
#define IS_DESCRIPTOR -1

#define NO_VARIABLE -1

/* A bunch of stuff for flow of control using setjmp () and longjmp (). */
#include <setjmp.h>
extern jmp_buf top_level, catch;

#define NOT_JUMPED 0		/* Not returning from a longjmp. */
#define FORCE_EOF 1		/* We want to stop parsing. */
#define DISCARD 2		/* Discard current command. */
#define EXITPROG 3		/* Unconditionally exit the program now. */

/* Values that can be returned by execute_command (). */
#define EXECUTION_FAILURE 1
#define EXECUTION_SUCCESS 0

/* Usage messages by builtins result in a return status of 2. */
#define EX_USAGE 2

/* Special exit status used when the shell is asked to execute a
   binary file as a shell script. */
#define EX_BINARY_FILE 126
#define EX_NOEXEC 126
#define EX_NOTFOUND 127

/* The list of characters that are quoted in double-quotes with a
   backslash.  Other characters following a backslash cause nothing
   special to happen. */
#define slashify_in_quotes "\\`$\""
#define slashify_in_here_document "\\`$"

/* Constants which specify how to handle backslashes and quoting in
   expand_word_internal ().  Q_DOUBLE_QUOTES means to use the function
   slashify_in_quotes () to decide whether the backslash should be
   retained.  Q_HERE_DOCUMENT means slashify_in_here_document () to
   decide whether to retain the backslash.  Q_KEEP_BACKSLASH means
   to unconditionally retain the backslash. */
#define Q_DOUBLE_QUOTES  0x1
#define Q_HERE_DOCUMENT  0x2
#define Q_KEEP_BACKSLASH 0x4

extern char **shell_environment;
extern WORD_LIST *rest_of_args;

/* Generalized global variables. */
extern int executing, login_shell;

/* Structure to pass around that holds a bitmap of file descriptors
   to close, and the size of that structure.  Used in execute_cmd.c. */
struct fd_bitmap {
  long size;
  char *bitmap;
};

#define FD_BITMAP_SIZE 32

#define CTLESC '\001'
#define CTLNUL '\177'

/* Information about the current user. */
struct user_info {
  int uid, euid;
  int gid, egid;
  char *user_name;
  char *shell;		/* shell from the password file */
  char *home_dir;
};

extern struct user_info current_user;