90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
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#include "./statman.h"
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#include <assert.h>
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#include <inttypes.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define REDIRECT_MAX_ 100
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static const statman_meta_t* statman_get_meta_by_state_(
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const statman_meta_t* meta, statman_state_t state) {
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assert(meta != NULL);
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for (size_t i = 0; meta[i].name != NULL; ++i) {
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if (meta[i].state == state) return &meta[i];
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}
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fprintf(stderr, "statman: unknown state %"PRIu16"\n", state);
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abort();
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}
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static void statman_initialize_state_(
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const statman_meta_t* meta,
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void* instance,
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statman_state_t* state,
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size_t depth) {
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assert(meta != NULL);
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assert(state != NULL);
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assert(depth < REDIRECT_MAX_);
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const statman_meta_t* m = statman_get_meta_by_state_(meta, *state);
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if (m->initialize == NULL) return;
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const statman_state_t backup = *state;
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m->initialize(m, instance, state);
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if (backup != *state) {
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statman_initialize_state_(meta, instance, state, depth+1);
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}
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}
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static void statman_update_state_(
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const statman_meta_t* meta,
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void* instance,
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statman_state_t* state,
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size_t depth) {
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assert(meta != NULL);
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assert(state != NULL);
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assert(depth < REDIRECT_MAX_);
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const statman_meta_t* m = statman_get_meta_by_state_(meta, *state);
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if (m->update == NULL) return;
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const statman_state_t backup = *state;
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m->update(m, instance, state);
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if (backup != *state) {
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statman_initialize_state_(meta, instance, state, depth+1);
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statman_update_state_(meta, instance, state, depth+1);
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}
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}
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void statman_update(
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const statman_meta_t* meta, void* instance, statman_state_t* state) {
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assert(meta != NULL);
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assert(state != NULL);
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statman_update_state_(meta, instance, state, 0);
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}
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void statman_transition_to(
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const statman_meta_t* meta,
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void* instance,
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statman_state_t* state,
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statman_state_t next) {
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assert(meta != NULL);
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assert(state != NULL);
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if (*state == next) return;
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const statman_meta_t* m = statman_get_meta_by_state_(meta, *state);
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if (m->finalize != NULL) {
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m->finalize(m, instance, &next);
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}
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if (*state == next) return;
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*state = next;
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statman_initialize_state_(meta, instance, state, 0);
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}
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