timers.c

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/*
 * Crossfire -- cooperative multi-player graphical RPG and adventure game
 *
 * Copyright (c) 1999-2014 Mark Wedel and the Crossfire Development Team
 * Copyright (c) 1992 Frank Tore Johansen
 *
 * Crossfire is free software and comes with ABSOLUTELY NO WARRANTY. You are
 * welcome to redistribute it under certain conditions. For details, please
 * see COPYING and LICENSE.
 *
 * The authors can be reached via e-mail at <crossfire@metalforge.org>.
 */

#include <string.h>

#include "timers.h"
#include "sproto.h"

/* Extern in header. */
cftimer timers_table[MAX_TIMERS];

static void cftimer_process_event(tag_t ob_tag);

void cftimer_process_timers(void) {
    int i;

    for (i = 0; i < MAX_TIMERS; i++) {
        if (timers_table[i].mode == TIMER_MODE_CYCLES) {
            timers_table[i].delay--;
            if (timers_table[i].delay == 0) {
                /* Call object timer event */
                timers_table[i].mode = TIMER_MODE_DEAD;
                cftimer_process_event(timers_table[i].ob_tag);
            }
        } else if (timers_table[i].mode == TIMER_MODE_SECONDS) {
            if (timers_table[i].delay <= seconds()) {
                /* Call object timer event */
                timers_table[i].mode = TIMER_MODE_DEAD;
                cftimer_process_event(timers_table[i].ob_tag);
            }
        }
    }
}

static void cftimer_process_event(tag_t ob_tag) {
    object *ob = object_find_by_tag_global(ob_tag);

    if (ob)
        events_execute_object_event(ob, EVENT_TIMER, NULL, NULL, NULL, SCRIPT_FIX_ALL);
}

int cftimer_create(int id, long delay, object *ob, int mode) {
    if (id >= MAX_TIMERS)
        return TIMER_ERR_ID;
    if (id < 0)
        return TIMER_ERR_ID;
    if (timers_table[id].mode != TIMER_MODE_DEAD)
        return TIMER_ERR_ID;
    if ((mode != TIMER_MODE_SECONDS) && (mode != TIMER_MODE_CYCLES))
        return TIMER_ERR_MODE;
    if (ob == NULL)
        return TIMER_ERR_OBJ;
    if (object_find_by_type_subtype(ob, EVENT_CONNECTOR, EVENT_TIMER) == NULL)
        return TIMER_ERR_OBJ;
    timers_table[id].mode = mode;
    timers_table[id].ob_tag = ob->count;
    if (mode == TIMER_MODE_CYCLES)
        timers_table[id].delay = delay;
    else
        timers_table[id].delay = seconds()+delay;
    return TIMER_ERR_NONE;
}

int cftimer_destroy(int id) {
    if (id >= MAX_TIMERS)
        return TIMER_ERR_ID;
    if (id < 0)
        return TIMER_ERR_ID;
    timers_table[id].mode = TIMER_MODE_DEAD;
    return TIMER_ERR_NONE;
}

int cftimer_find_free_id(void) {
    int i;

    for (i = 0; i < MAX_TIMERS; i++) {
        if (timers_table[i].mode == TIMER_MODE_DEAD)
            return i;
    }
    return TIMER_ERR_ID;
}

void cftimer_init(void) {
    memset(&timers_table[0], 0, sizeof(cftimer)*MAX_TIMERS);
}