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Editing: state_machine.h

/*
 * wpa_supplicant/hostapd - State machine definitions
 * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 *
 * This file includes a set of pre-processor macros that can be used to
 * implement a state machine. In addition to including this header file, each
 * file implementing a state machine must define STATE_MACHINE_DATA to be the
 * data structure including state variables (enum machine_state,
 * Boolean changed), and STATE_MACHINE_DEBUG_PREFIX to be a string that is used
 * as a prefix for all debug messages. If SM_ENTRY_MA macro is used to define
 * a group of state machines with shared data structure, STATE_MACHINE_ADDR
 * needs to be defined to point to the MAC address used in debug output.
 * SM_ENTRY_M macro can be used to define similar group of state machines
 * without this additional debug info.
 */

#ifndef STATE_MACHINE_H
#define STATE_MACHINE_H

/**
 * SM_STATE - Declaration of a state machine function
 * @machine: State machine name
 * @state: State machine state
 *
 * This macro is used to declare a state machine function. It is used in place
 * of a C function definition to declare functions to be run when the state is
 * entered by calling SM_ENTER or SM_ENTER_GLOBAL.
 */
#define SM_STATE(machine, state) \
static void sm_ ## machine ## _ ## state ## _Enter(STATE_MACHINE_DATA *sm, \
	int global)

/**
 * SM_ENTRY - State machine function entry point
 * @machine: State machine name
 * @state: State machine state
 *
 * This macro is used inside each state machine function declared with
 * SM_STATE. SM_ENTRY should be in the beginning of the function body, but
 * after declaration of possible local variables. This macro prints debug
 * information about state transition and update the state machine state.
 */
#define SM_ENTRY(machine, state) \
if (!global || sm->machine ## _state != machine ## _ ## state) { \
	sm->changed = TRUE; \
	wpa_printf(MSG_DEBUG, STATE_MACHINE_DEBUG_PREFIX ": " #machine \
		   " entering state " #state); \
} \
sm->machine ## _state = machine ## _ ## state;

/**
 * SM_ENTRY_M - State machine function entry point for state machine group
 * @machine: State machine name
 * @_state: State machine state
 * @data: State variable prefix (full variable: prefix_state)
 *
 * This macro is like SM_ENTRY, but for state machine groups that use a shared
 * data structure for more than one state machine. Both machine and prefix
 * parameters are set to "sub-state machine" name. prefix is used to allow more
 * than one state variable to be stored in the same data structure.
 */
#define SM_ENTRY_M(machine, _state, data) \
if (!global || sm->data ## _ ## state != machine ## _ ## _state) { \
	sm->changed = TRUE; \
	wpa_printf(MSG_DEBUG, STATE_MACHINE_DEBUG_PREFIX ": " \
		   #machine " entering state " #_state); \
} \
sm->data ## _ ## state = machine ## _ ## _state;

/**
 * SM_ENTRY_MA - State machine function entry point for state machine group
 * @machine: State machine name
 * @_state: State machine state
 * @data: State variable prefix (full variable: prefix_state)
 *
 * This macro is like SM_ENTRY_M, but a MAC address is included in debug
 * output. STATE_MACHINE_ADDR has to be defined to point to the MAC address to
 * be included in debug.
 */
#define SM_ENTRY_MA(machine, _state, data) \
if (!global || sm->data ## _ ## state != machine ## _ ## _state) { \
	sm->changed = TRUE; \
	wpa_printf(MSG_DEBUG, STATE_MACHINE_DEBUG_PREFIX ": " MACSTR " " \
		   #machine " entering state " #_state, \
		   MAC2STR(STATE_MACHINE_ADDR)); \
} \
sm->data ## _ ## state = machine ## _ ## _state;

/**
 * SM_ENTER - Enter a new state machine state
 * @machine: State machine name
 * @state: State machine state
 *
 * This macro expands to a function call to a state machine function defined
 * with SM_STATE macro. SM_ENTER is used in a state machine step function to
 * move the state machine to a new state.
 */
#define SM_ENTER(machine, state) \
sm_ ## machine ## _ ## state ## _Enter(sm, 0)

/**
 * SM_ENTER_GLOBAL - Enter a new state machine state based on global rule
 * @machine: State machine name
 * @state: State machine state
 *
 * This macro is like SM_ENTER, but this is used when entering a new state
 * based on a global (not specific to any particular state) rule. A separate
 * macro is used to avoid unwanted debug message floods when the same global
 * rule is forcing a state machine to remain in on state.
 */
#define SM_ENTER_GLOBAL(machine, state) \
sm_ ## machine ## _ ## state ## _Enter(sm, 1)

/**
 * SM_STEP - Declaration of a state machine step function
 * @machine: State machine name
 *
 * This macro is used to declare a state machine step function. It is used in
 * place of a C function definition to declare a function that is used to move
 * state machine to a new state based on state variables. This function uses
 * SM_ENTER and SM_ENTER_GLOBAL macros to enter new state.
 */
#define SM_STEP(machine) \
static void sm_ ## machine ## _Step(STATE_MACHINE_DATA *sm)

/**
 * SM_STEP_RUN - Call the state machine step function
 * @machine: State machine name
 *
 * This macro expands to a function call to a state machine step function
 * defined with SM_STEP macro.
 */
#define SM_STEP_RUN(machine) sm_ ## machine ## _Step(sm)

#endif /* STATE_MACHINE_H */

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Editing: state_machine.h

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