init.c

/*
 * Initialisation
 *
 * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
 * Copyright (c) 2017 by Eric S. Raymond
 * SPDX-License-Identifier: BSD-2-clause
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <time.h>

#include "advent.h"

struct settings_t settings = {
    .logfp = NULL,
    .oldstyle = false,
    .prompt = true
};

struct game_t game = {
    .dloc[1] = LOC_KINGHALL,
    .dloc[2] = LOC_WESTBANK,
    .dloc[3] = LOC_Y2,
    .dloc[4] = LOC_ALIKE3,
    .dloc[5] = LOC_COMPLEX,

    /*  Sixth dwarf is special (the pirate).  He always starts at his
     *  chest's eventual location inside the maze. This loc is saved
     *  in chloc for ref. The dead end in the other maze has its
     *  loc stored in chloc2. */
    .dloc[6] = LOC_DEADEND12,
    .chloc   = LOC_DEADEND12,
    .chloc2  = LOC_DEADEND13,
    .abbnum  = 5,
    .clock1  = WARNTIME,
    .clock2  = FLASHTIME,
    .newloc  = LOC_START,
    .loc     = LOC_START,
    .limit   = GAMELIMIT,
    .foobar  = WORD_EMPTY,
};

long initialise(void)
{
    if (settings.oldstyle)
        printf("Initialising...\n");

    srand(time(NULL));
    long seedval = (long)rand();
    set_seed(seedval);

    for (int i = 1; i <= NOBJECTS; i++) {
        game.place[i] = LOC_NOWHERE;
    }

    for (int i = 1; i <= NLOCATIONS; i++) {
        if (!(locations[i].description.big == 0 ||
              tkey[i] == 0)) {
            int k = tkey[i];
            if (T_TERMINATE(travel[k]))
                conditions[i] |= (1 << COND_FORCED);
        }
    }

    /*  Set up the game.atloc and game.link arrays.
     *  We'll use the DROP subroutine, which prefaces new objects on the
     *  lists.  Since we want things in the other order, we'll run the
     *  loop backwards.  If the object is in two locs, we drop it twice.
     *  Also, since two-placed objects are typically best described
     *  last, we'll drop them first. */
    for (int i = NOBJECTS; i >= 1; i--) {
        if (objects[i].fixd > 0) {
            drop(i + NOBJECTS, objects[i].fixd);
            drop(i, objects[i].plac);
        }
    }

    for (int i = 1; i <= NOBJECTS; i++) {
        int k = NOBJECTS + 1 - i;
        game.fixed[k] = objects[k].fixd;
        if (objects[k].plac != 0 && objects[k].fixd <= 0)
            drop(k, objects[k].plac);
    }

    /*  Treasure props are initially -1, and are set to 0 the first time
     *  they are described.  game.tally keeps track of how many are
     *  not yet found, so we know when to close the cave. */
    for (int treasure = 1; treasure <= NOBJECTS; treasure++) {
        if (objects[treasure].is_treasure) {
            if (objects[treasure].inventory != 0)
                game.prop[treasure] = STATE_NOTFOUND;
            game.tally = game.tally - game.prop[treasure];
        }
    }
    game.conds = setbit(11);

    return seedval;
}