forked from acouzens/open5gs
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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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 Affero 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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*
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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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*
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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 <https://www.gnu.org/licenses/>.
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*/
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#include "ogs-core.h"
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typedef struct fsm_event_s {
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int id;
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} fsm_event_t;
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static fsm_event_t entry_event = {
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OGS_FSM_ENTRY_SIG,
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};
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static fsm_event_t exit_event = {
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OGS_FSM_EXIT_SIG,
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};
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const char *OGS_FSM_NAME_INIT_SIG = "INIT";
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const char *OGS_FSM_NAME_ENTRY_SIG = "ENTRY";
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const char *OGS_FSM_NAME_EXIT_SIG = "EXIT";
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static void fsm_entry(ogs_fsm_t *sm, ogs_fsm_handler_t state, fsm_event_t *e)
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{
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ogs_assert(sm);
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ogs_assert(state);
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if (e) {
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e->id = OGS_FSM_ENTRY_SIG;
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(*state)(sm, e);
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} else {
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(*state)(sm, &entry_event);
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}
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}
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static void fsm_exit(ogs_fsm_t *sm, ogs_fsm_handler_t state, fsm_event_t *e)
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{
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ogs_assert(sm);
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ogs_assert(state);
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if (e) {
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e->id = OGS_FSM_EXIT_SIG;
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(*state)(sm, e);
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} else {
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(*state)(sm, &exit_event);
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}
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}
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static void fsm_change(
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ogs_fsm_t *sm,
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ogs_fsm_handler_t oldstate,
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ogs_fsm_handler_t newstate,
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fsm_event_t *e)
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{
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ogs_assert(sm);
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ogs_assert(oldstate);
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ogs_assert(newstate);
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fsm_exit(sm, oldstate, e);
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fsm_entry(sm, newstate, e);
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}
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void ogs_fsm_init(void *fsm, void *init, void *fini, void *event)
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{
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ogs_fsm_t *sm = fsm;
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fsm_event_t *e = event;
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ogs_assert(sm);
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sm->init = sm->state = init;
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sm->fini = fini;
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if (sm->init) {
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(*sm->init)(sm, e);
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if (sm->init != sm->state) {
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ogs_assert(sm->state);
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fsm_entry(sm, sm->state, e);
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}
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}
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}
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void ogs_fsm_tran(void *fsm, void *state, void *event)
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{
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ogs_fsm_t *sm = fsm;
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fsm_event_t *e = event;
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ogs_fsm_handler_t tmp = NULL;
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ogs_assert(sm);
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tmp = sm->state;
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ogs_assert(tmp);
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sm->state = state;
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ogs_assert(sm->state);
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if (sm->state != tmp)
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fsm_change(fsm, tmp, sm->state, e);
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}
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void ogs_fsm_dispatch(void *fsm, void *event)
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{
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ogs_fsm_t *sm = fsm;
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fsm_event_t *e = event;
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ogs_fsm_handler_t tmp = NULL;
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ogs_assert(sm);
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tmp = sm->state;
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ogs_assert(tmp);
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if (e)
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(*tmp)(sm, e);
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if (sm->state != tmp)
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fsm_change(fsm, tmp, sm->state, e);
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}
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void ogs_fsm_fini(void *fsm, void *event)
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{
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ogs_fsm_t *sm = fsm;
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fsm_event_t *e = event;
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ogs_assert(sm);
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if (sm->fini != sm->state) {
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ogs_assert(sm->state);
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fsm_exit(sm, sm->state, e);
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if (sm->fini)
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(*sm->fini)(sm, e);
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}
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sm->init = sm->state = sm->fini = NULL;
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}
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