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5538b03c98
I don't understand what the sfunc function type in cmd_list_element::function is for. Compared to cmd_simple_func_ftype, it has an extra cmd_list_element parameter, giving the callback access to the cmd_list_element for the command being invoked. This allows registering the same callback with many commands, and alter the behavior using the cmd_list_element's context. From the comment in cmd_list_element, it sounds like at some point it was the callback function type for set and show functions, hence the "s". But nowadays, it's used for many more commands that need to access the cmd_list_element object (see add_catch_command for example). I don't really see the point of having sfunc at all, since do_sfunc is just a trivial shim that changes the order of the arguments. All commands using sfunc could just as well set cmd_list_element::func to their callback directly. Therefore, remove the sfunc field in cmd_list_element and everything that goes with it. Rename cmd_const_sfunc_ftype to cmd_func_ftype and use it for cmd_list_element::func, as well as for the add_setshow commands. Change-Id: I1eb96326c9b511c293c76996cea0ebc51c70fac0
541 lines
21 KiB
C++
541 lines
21 KiB
C++
/* Header file for command creation.
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Copyright (C) 1986-2021 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (COMMAND_H)
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#define COMMAND_H 1
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#include "gdbsupport/gdb_vecs.h"
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#include "gdbsupport/scoped_restore.h"
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struct completion_tracker;
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/* This file defines the public interface for any code wanting to
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create commands. */
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/* Command classes are top-level categories into which commands are
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broken down for "help" purposes.
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The class_alias is used for the user-defined aliases, defined
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using the "alias" command.
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Aliases pre-defined by GDB (e.g. the alias "bt" of the "backtrace" command)
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are not using the class_alias.
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Different pre-defined aliases of the same command do not necessarily
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have the same classes. For example, class_stack is used for the
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"backtrace" and its "bt" alias", while "info stack" (also an alias
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of "backtrace" uses class_info. */
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enum command_class
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{
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/* Classes of commands followed by a comment giving the name
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to use in "help <classname>".
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Note that help accepts unambiguous abbreviated class names. */
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/* Special classes to help_list */
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class_deprecated = -3,
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all_classes = -2, /* help without <classname> */
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all_commands = -1, /* all */
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/* Classes of commands */
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no_class = -1,
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class_run = 0, /* running */
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class_vars, /* data */
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class_stack, /* stack */
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class_files, /* files */
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class_support, /* support */
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class_info, /* status */
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class_breakpoint, /* breakpoints */
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class_trace, /* tracepoints */
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class_alias, /* aliases */
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class_bookmark,
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class_obscure, /* obscure */
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class_maintenance, /* internals */
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class_tui, /* text-user-interface */
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class_user, /* user-defined */
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/* Used for "show" commands that have no corresponding "set" command. */
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no_set_class
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};
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/* Types of "set" or "show" command. */
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typedef enum var_types
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{
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/* "on" or "off". *VAR is a bool which is true for on,
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false for off. */
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var_boolean,
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/* "on" / "true" / "enable" or "off" / "false" / "disable" or
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"auto. *VAR is an ``enum auto_boolean''. NOTE: In general a
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custom show command will need to be implemented - one that for
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"auto" prints both the "auto" and the current auto-selected
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value. */
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var_auto_boolean,
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/* Unsigned Integer. *VAR is an unsigned int. The user can type
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0 to mean "unlimited", which is stored in *VAR as UINT_MAX. */
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var_uinteger,
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/* Like var_uinteger but signed. *VAR is an int. The user can
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type 0 to mean "unlimited", which is stored in *VAR as
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INT_MAX. The only remaining use of it is the Python API.
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Don't use it elsewhere. */
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var_integer,
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/* String which the user enters with escapes (e.g. the user types
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\n and it is a real newline in the stored string).
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*VAR is a malloc'd string, or NULL if the string is empty. */
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var_string,
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/* String which stores what the user types verbatim.
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*VAR is a malloc'd string, or NULL if the string is empty. */
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var_string_noescape,
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/* String which stores a filename. (*VAR) is a malloc'd string,
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or "" if the string was empty. */
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var_optional_filename,
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/* String which stores a filename. (*VAR) is a malloc'd
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string. */
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var_filename,
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/* ZeroableInteger. *VAR is an int. Like var_integer except
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that zero really means zero. */
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var_zinteger,
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/* ZeroableUnsignedInteger. *VAR is an unsigned int. Zero really
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means zero. */
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var_zuinteger,
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/* ZeroableUnsignedInteger with unlimited value. *VAR is an int,
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but its range is [0, INT_MAX]. -1 stands for unlimited and
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other negative numbers are not allowed. */
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var_zuinteger_unlimited,
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/* Enumerated type. Can only have one of the specified values.
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*VAR is a char pointer to the name of the element that we
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find. */
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var_enum
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}
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var_types;
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/* This structure records one command'd definition. */
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struct cmd_list_element;
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/* The "simple" signature of command callbacks, which doesn't include a
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cmd_list_element parameter. */
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typedef void cmd_simple_func_ftype (const char *args, int from_tty);
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/* This structure specifies notifications to be suppressed by a cli
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command interpreter. */
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struct cli_suppress_notification
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{
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/* Inferior, thread, frame selected notification suppressed? */
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int user_selected_context;
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};
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extern struct cli_suppress_notification cli_suppress_notification;
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/* Forward-declarations of the entry-points of cli/cli-decode.c. */
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/* API to the manipulation of command lists. */
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/* Return TRUE if NAME is a valid user-defined command name.
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This is a stricter subset of all gdb commands,
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see find_command_name_length. */
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extern bool valid_user_defined_cmd_name_p (const char *name);
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/* Return TRUE if C is a valid command character. */
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extern bool valid_cmd_char_p (int c);
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/* Const-correct variant of the above. */
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extern struct cmd_list_element *add_cmd (const char *, enum command_class,
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cmd_simple_func_ftype *fun,
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const char *,
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struct cmd_list_element **);
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/* Like add_cmd, but no command function is specified. */
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extern struct cmd_list_element *add_cmd (const char *, enum command_class,
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const char *,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_cmd_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_simple_func_ftype *fun, const char *doc,
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struct cmd_list_element **list,
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int *suppress_notification);
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extern struct cmd_list_element *add_alias_cmd (const char *,
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cmd_list_element *,
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enum command_class, int,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_prefix_cmd (const char *, enum command_class,
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cmd_simple_func_ftype *fun,
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const char *,
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struct cmd_list_element **,
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int,
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struct cmd_list_element **);
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/* Like add_prefix_cmd, but sets the callback to a function that
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simply calls help_list. */
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extern struct cmd_list_element *add_basic_prefix_cmd
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(const char *, enum command_class, const char *, struct cmd_list_element **,
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int, struct cmd_list_element **);
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/* Like add_prefix_cmd, but useful for "show" prefixes. This sets the
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callback to a function that simply calls cmd_show_list. */
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extern struct cmd_list_element *add_show_prefix_cmd
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(const char *, enum command_class, const char *, struct cmd_list_element **,
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int, struct cmd_list_element **);
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extern struct cmd_list_element *add_prefix_cmd_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_simple_func_ftype *fun,
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const char *doc, struct cmd_list_element **subcommands,
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int allow_unknown,
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struct cmd_list_element **list,
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int *suppress_notification);
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extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
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enum command_class,
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cmd_simple_func_ftype *fun,
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const char *,
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struct cmd_list_element
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**, int,
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struct cmd_list_element
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**);
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typedef void cmd_func_ftype (const char *args, int from_tty,
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cmd_list_element *c);
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/* A completion routine. Add possible completions to tracker.
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TEXT is the text beyond what was matched for the command itself
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(leading whitespace is skipped). It stops where we are supposed to
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stop completing (rl_point) and is '\0' terminated. WORD points in
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the same buffer as TEXT, and completions should be returned
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relative to this position. For example, suppose TEXT is "foo" and
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we want to complete to "foobar". If WORD is "oo", return "oobar";
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if WORD is "baz/foo", return "baz/foobar". */
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typedef void completer_ftype (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *text, const char *word);
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/* Same, but for set_cmd_completer_handle_brkchars. */
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typedef void completer_handle_brkchars_ftype (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *text, const char *word);
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extern void set_cmd_completer (struct cmd_list_element *, completer_ftype *);
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/* Set the completer_handle_brkchars callback. */
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extern void set_cmd_completer_handle_brkchars (struct cmd_list_element *,
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completer_handle_brkchars_ftype *);
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/* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
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around in cmd objects to test the value of the commands sfunc(). */
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extern int cmd_simple_func_eq (struct cmd_list_element *cmd,
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cmd_simple_func_ftype *cfun);
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/* Execute CMD's pre/post hook. Throw an error if the command fails.
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If already executing this pre/post hook, or there is no pre/post
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hook, the call is silently ignored. */
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extern void execute_cmd_pre_hook (struct cmd_list_element *cmd);
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extern void execute_cmd_post_hook (struct cmd_list_element *cmd);
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/* Flag for an ambiguous cmd_list result. */
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#define CMD_LIST_AMBIGUOUS ((struct cmd_list_element *) -1)
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extern struct cmd_list_element *lookup_cmd (const char **,
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struct cmd_list_element *,
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const char *,
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std::string *,
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int, int);
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/* This routine takes a line of TEXT and a CLIST in which to start the
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lookup. When it returns it will have incremented the text pointer past
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the section of text it matched, set *RESULT_LIST to point to the list in
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which the last word was matched, and will return a pointer to the cmd
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list element which the text matches. It will return NULL if no match at
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all was possible. It will return -1 (cast appropriately, ick) if ambigous
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matches are possible; in this case *RESULT_LIST will be set to point to
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the list in which there are ambiguous choices (and *TEXT will be set to
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the ambiguous text string).
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if DEFAULT_ARGS is not null, *DEFAULT_ARGS is set to the found command
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default args (possibly empty).
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If the located command was an abbreviation, this routine returns the base
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command of the abbreviation. Note that *DEFAULT_ARGS will contain the
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default args defined for the alias.
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It does no error reporting whatsoever; control will always return
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to the superior routine.
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In the case of an ambiguous return (-1), *RESULT_LIST will be set to point
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at the prefix_command (ie. the best match) *or* (special case) will be NULL
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if no prefix command was ever found. For example, in the case of "info a",
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"info" matches without ambiguity, but "a" could be "args" or "address", so
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*RESULT_LIST is set to the cmd_list_element for "info". So in this case
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RESULT_LIST should not be interpreted as a pointer to the beginning of a
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list; it simply points to a specific command. In the case of an ambiguous
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return *TEXT is advanced past the last non-ambiguous prefix (e.g.
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"info t" can be "info types" or "info target"; upon return *TEXT has been
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advanced past "info ").
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If RESULT_LIST is NULL, don't set *RESULT_LIST (but don't otherwise
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affect the operation).
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This routine does *not* modify the text pointed to by TEXT.
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If IGNORE_HELP_CLASSES is nonzero, ignore any command list elements which
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are actually help classes rather than commands (i.e. the function field of
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the struct cmd_list_element is NULL).
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When LOOKUP_FOR_COMPLETION_P is true the completion is being requested
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for the completion engine, no warnings should be printed. */
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extern struct cmd_list_element *lookup_cmd_1
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(const char **text, struct cmd_list_element *clist,
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struct cmd_list_element **result_list, std::string *default_args,
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int ignore_help_classes, bool lookup_for_completion_p = false);
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/* Look up the command called NAME in the command list LIST.
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Unlike LOOKUP_CMD, partial matches are ignored and only exact matches
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on NAME are considered.
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LIST is a chain of struct cmd_list_element's.
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If IGNORE_HELP_CLASSES is true (the default), ignore any command list
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elements which are actually help classes rather than commands (i.e.
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the function field of the struct cmd_list_element is null).
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If found, return the struct cmd_list_element for that command,
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otherwise return NULLPTR. */
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extern struct cmd_list_element *lookup_cmd_exact
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(const char *name,
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struct cmd_list_element *list,
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bool ignore_help_classes = true);
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extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
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const char * );
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extern void deprecated_cmd_warning (const char *, struct cmd_list_element *);
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extern int lookup_cmd_composition (const char *text,
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struct cmd_list_element **alias,
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struct cmd_list_element **prefix_cmd,
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struct cmd_list_element **cmd);
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extern struct cmd_list_element *add_com (const char *, enum command_class,
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cmd_simple_func_ftype *fun,
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const char *);
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extern cmd_list_element *add_com_alias (const char *name,
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cmd_list_element *target,
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command_class theclass,
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int abbrev_flag);
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extern struct cmd_list_element *add_com_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_simple_func_ftype *fun, const char *doc,
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int *supress_notification);
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extern struct cmd_list_element *add_info (const char *,
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cmd_simple_func_ftype *fun,
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const char *);
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extern cmd_list_element *add_info_alias (const char *name,
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cmd_list_element *target,
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int abbrev_flag);
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extern void complete_on_cmdlist (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *, const char *, int);
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extern void complete_on_enum (completion_tracker &tracker,
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const char *const *enumlist,
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const char *, const char *);
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/* Functions that implement commands about CLI commands. */
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extern void help_list (struct cmd_list_element *, const char *,
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enum command_class, struct ui_file *);
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/* Method for show a set/show variable's VALUE on FILE. If this
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method isn't supplied deprecated_show_value_hack() is called (which
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is not good). */
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typedef void (show_value_ftype) (struct ui_file *file,
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int from_tty,
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struct cmd_list_element *cmd,
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const char *value);
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/* NOTE: i18n: This function is not i18n friendly. Callers should
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instead print the value out directly. */
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extern show_value_ftype deprecated_show_value_hack;
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/* Return value type for the add_setshow_* functions. */
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struct set_show_commands
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{
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cmd_list_element *set, *show;
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};
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extern set_show_commands add_setshow_enum_cmd
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(const char *name, command_class theclass, const char *const *enumlist,
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const char **var, const char *set_doc, const char *show_doc,
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const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_auto_boolean_cmd
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(const char *name, command_class theclass, auto_boolean *var,
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const char *set_doc, const char *show_doc, const char *help_doc,
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cmd_func_ftype *set_func, show_value_ftype *show_func,
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cmd_list_element **set_list, cmd_list_element **show_list);
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extern set_show_commands add_setshow_boolean_cmd
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(const char *name, command_class theclass, bool *var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_filename_cmd
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(const char *name, command_class theclass, char **var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_string_cmd
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(const char *name, command_class theclass, char **var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_string_noescape_cmd
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(const char *name, command_class theclass, char **var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_optional_filename_cmd
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(const char *name, command_class theclass, char **var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_integer_cmd
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(const char *name, command_class theclass, int *var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_uinteger_cmd
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(const char *name, command_class theclass, unsigned int *var,
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const char *set_doc, const char *show_doc, const char *help_doc,
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cmd_func_ftype *set_func, show_value_ftype *show_func,
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cmd_list_element **set_list, cmd_list_element **show_list);
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extern set_show_commands add_setshow_zinteger_cmd
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(const char *name, command_class theclass, int *var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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extern set_show_commands add_setshow_zuinteger_cmd
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(const char *name, command_class theclass, unsigned int *var,
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const char *set_doc, const char *show_doc, const char *help_doc,
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cmd_func_ftype *set_func, show_value_ftype *show_func,
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cmd_list_element **set_list, cmd_list_element **show_list);
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extern set_show_commands add_setshow_zuinteger_unlimited_cmd
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(const char *name, command_class theclass, int *var, const char *set_doc,
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const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
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show_value_ftype *show_func, cmd_list_element **set_list,
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cmd_list_element **show_list);
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/* Do a "show" command for each thing on a command list. */
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extern void cmd_show_list (struct cmd_list_element *, int);
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/* Used everywhere whenever at least one parameter is required and
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none is specified. */
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extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;
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/* Command line saving and repetition.
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Each input line executed is saved to possibly be repeated either
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when the user types an empty line, or be repeated by a command
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that wants to repeat the previously executed command. The below
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functions control command repetition. */
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/* Commands call dont_repeat if they do not want to be repeated by null
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lines or by repeat_previous (). */
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extern void dont_repeat ();
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/* Commands call repeat_previous if they want to repeat the previous
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command. Such commands that repeat the previous command must
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indicate to not repeat themselves, to avoid recursive repeat.
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repeat_previous marks the current command as not repeating, and
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ensures get_saved_command_line returns the previous command, so
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that the currently executing command can repeat it. If there's no
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previous command, throws an error. Otherwise, returns the result
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of get_saved_command_line, which now points at the command to
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repeat. */
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extern const char *repeat_previous ();
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/* Prevent dont_repeat from working, and return a cleanup that
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restores the previous state. */
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extern scoped_restore_tmpl<int> prevent_dont_repeat (void);
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/* Set the arguments that will be passed if the current command is
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repeated. Note that the passed-in string must be a constant. */
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extern void set_repeat_arguments (const char *args);
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/* Returns the saved command line to repeat.
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When a command is being executed, this is the currently executing
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command line, unless the currently executing command has called
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repeat_previous (): in this case, get_saved_command_line returns
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the previously saved command line. */
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extern char *get_saved_command_line ();
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/* Takes a copy of CMD, for possible repetition. */
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extern void save_command_line (const char *cmd);
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/* Used to mark commands that don't do anything. If we just leave the
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function field NULL, the command is interpreted as a help topic, or
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as a class of commands. */
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extern void not_just_help_class_command (const char *, int);
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/* Call the command function. */
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extern void cmd_func (struct cmd_list_element *cmd,
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const char *args, int from_tty);
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#endif /* !defined (COMMAND_H) */
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