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/* Definitions used by GDB event-top.c.

   Copyright 1999 Free Software Foundation, Inc.

   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.

   This file is part of GDB.

   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, USA.  */

/* Stack for prompts. Each prompt is composed as a prefix, a prompt

   and a suffix. The prompt to be displayed at any given time is the

   one on top of the stack.  A stack is necessary because of cases in

   which the execution of a gdb command requires further input from

   the user, like for instance 'commands' for breakpoints and

   'actions' for tracepoints. In these cases, the prompt is '>' and

   gdb should process input using the asynchronous readline interface

   and the event loop.  In order to achieve this, we need to save

   somewhere the state of GDB, i.e. that it is processing user input

   as part of a command and not as part of the top level command loop.

   The prompt stack represents part of the saved state. Another part

   would be the function that readline would invoke after a whole line

   of input has ben entered. This second piece would be something

   like, for instance, where to return within the code for the actions

   commands after a line has been read.  This latter portion has not

   beeen implemented yet.  The need for a 3-part prompt arises from

   the annotation level. When this is set to 2, the prompt is actually

   composed of a prefix, the prompt itself and a suffix. */

/* At any particular time there will be always at least one prompt on

   the stack, the one being currently displayed by gdb. If gdb is

   using annotation level equal 2, there will be 2 prompts on the

   stack: the usual one, w/o prefix and suffix (at top - 1), and the

   'composite' one with prefix and suffix added (at top). At this

   time, this is the only use of the prompt stack. Resetting annotate

   to 0 or 1, pops the top of the stack, resetting its size to one

   element. The MAXPROMPTS limit is safe, for now. Once other cases

   are dealt with (like the different prompts used for 'commands' or

   'actions') this array implementation of the prompt stack may have

   to change. */

#define MAXPROMPTS 10

struct prompts

  {

    struct

      {

        char *prefix;

        char *prompt;

        char *suffix;

      }

    prompt_stack[MAXPROMPTS];

    int top;

  };

#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt

#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix

#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix

/* Exported functions from event-top.c.

   FIXME: these should really go into top.h. */

extern void display_gdb_prompt (char *new_prompt);

extern void async_init_signals (void);

extern void set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c);

extern void set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c);

extern void set_async_prompt (char *args, int from_tty, struct cmd_list_element *c);

/* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT.  */

#ifndef STOP_SIGNAL

#ifdef SIGTSTP

#define STOP_SIGNAL SIGTSTP

extern void handle_stop_sig (int sig);

#endif

#endif

extern void handle_sigint (int sig);

extern void pop_prompt (void);

extern void push_prompt (char *prefix, char *prompt, char *suffix);

extern void gdb_readline2 (void *client_data);

extern void mark_async_signal_handler_wrapper (void *token);

extern void async_request_quit (void *arg);

extern void stdin_event_handler (int error, void *client_data);

extern void async_disable_stdin (void);

extern void async_enable_stdin (void *dummy);

/* Exported variables from event-top.c.

   FIXME: these should really go into top.h. */

extern int async_command_editing_p;

extern int exec_done_display_p;

extern char *async_annotation_suffix;

extern char *new_async_prompt;

extern struct prompts the_prompts;

extern void (*call_readline) (void *);

extern void (*input_handler) (char *);

extern int input_fd;