view xrogue/daemon.c @ 310:827441d05b3e

Advanced Rogue family: fix some potential buffer overflows. Some code for determining the score file location assumed that PATH_MAX would be less than 1024, which cannot be guaranteed. Advanced Rogue 5 and 7, and XRogue, have had the buffers for the file name enlarged. UltraRogue never called the functions, so the code has been deleted instead.
author John "Elwin" Edwards
date Mon, 03 May 2021 19:05:37 -0400
parents e1cd27c5464f
children
line wrap: on
line source

/*
    daemon.c - functions for dealing with things that happen in the future
 
    XRogue: Expeditions into the Dungeons of Doom
    Copyright (C) 1991 Robert Pietkivitch
    All rights reserved.
    
    Based on "Advanced Rogue"
    Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
    All rights reserved.

    Based on "Rogue: Exploring the Dungeons of Doom"
    Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
    All rights reserved.
    
    See the file LICENSE.TXT for full copyright and licensing information.
*/

#include <curses.h>
#include "rogue.h"

#define EMPTY           0
#define DAEMON          -1

#define _X_ { EMPTY }

struct delayed_action d_list[MAXDAEMONS] = {
        _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
};
struct delayed_action f_list[MAXFUSES] = {
        _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_,
        _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_, _X_
};

int demoncnt = 0;        /* number of active daemons */
int fusecnt = 0;


/*
 * d_slot:
 *      Find an empty slot in the daemon list
 */
struct delayed_action *
d_slot(void)
{
        reg int i;
        reg struct delayed_action *dev;

        for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++)
                if (dev->d_type == EMPTY)
                        return dev;
        return NULL;
}

/*
 * f_slot:
 *      Find an empty slot in the fuses list
 */
struct delayed_action *
f_slot(void)
{
        reg int i;
        reg struct delayed_action *dev;

        for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
                if (dev->d_type == EMPTY)
                        return dev;
        return NULL;
}

/*
 * find_slot:
 *      Find a particular slot in the table
 */

struct delayed_action *
find_slot(void (*func)())
{
        reg int i;
        reg struct delayed_action *dev;

        for (i = 0, dev = f_list; i < MAXFUSES; i++, dev++)
                if (dev->d_type != EMPTY && func == dev->d_func)
                        return dev;
        return NULL;
}

/*
 * start_daemon:
 *      Start a daemon, takes a function.
 */

void
start_daemon(void (*dfunc)(), void *arg, int type)
{
        reg struct delayed_action *dev;

        dev = d_slot();
        if (dev != NULL) {
                dev->d_type = type;
                dev->d_func = dfunc;
                dev->d_arg.vp = arg;
                dev->d_time = DAEMON;
                demoncnt += 1;                  /* update count */
        }
}

/*
 * kill_daemon:
 *      Remove a daemon from the list
 */

void
kill_daemon(void (*dfunc)())
{
        reg struct delayed_action *dev;
        reg int i;

        for (i = 0, dev = d_list; i < MAXDAEMONS; i++, dev++) {
                if (dev->d_type != EMPTY && dfunc == dev->d_func)
                        break;
        }
        if (i >= MAXDAEMONS) return; /* if not found, forget it */
        /*
         * Take it out of the list
         */
        dev->d_type = EMPTY;
		dev->d_arg.vp  = NULL;
		dev->d_func = NULL;
		dev->d_time = 0;

        demoncnt -= 1;                  /* update count */
}

/*
 * do_daemons:
 *      Run all the daemons that are active with the current flag,
 *      passing the argument to the function.
 */

void
do_daemons(int flag)
{
        struct delayed_action *dev;
        int i;

        /*
         * Loop through the devil list
         */
        for (i = 0; i < MAXDAEMONS; i++)
        {
            dev = &d_list[i];
        /*
         * Executing each one, giving it the proper arguments
         */
                if ((dev->d_type == flag) && (dev->d_time == DAEMON) && (dev->d_func != NULL))
                        (*dev->d_func)(dev->d_arg.vp);
        }
}

/*
 * fuse:
 *      Start a fuse to go off in a certain number of turns
 */

void
fuse(void (*dfunc)(), void *arg, int time, int type)
{
        reg struct delayed_action *wire;

        wire = f_slot();
        if (wire != NULL) {
                wire->d_type = type;
                wire->d_func = dfunc;
                if (dfunc == changeclass || dfunc == res_strength)
                        wire->d_arg.i = *(int *) arg;
                else
                        wire->d_arg.vp = arg;
                wire->d_time = time;
                fusecnt += 1;                   /* update count */
        }
}

/*
 * lengthen:
 *      Increase the time until a fuse goes off
 */

void
lengthen(void (*dfunc)(), int xtime)
{
        reg struct delayed_action *wire;

        if ((wire = find_slot(dfunc)) == NULL)
                return;
        wire->d_time += xtime;
}

/*
 * extinguish:
 *      Put out a fuse
 */

void
extinguish(void (*dfunc)())
{
        reg struct delayed_action *wire;

        if ((wire = find_slot(dfunc)) == NULL)
                return;
        wire->d_type = EMPTY;
		wire->d_func = NULL;
		wire->d_arg.vp = NULL;
		wire->d_time = 0;
        fusecnt -= 1;
}

/*
 * do_fuses:
 *      Decrement counters and start needed fuses
 */

void
do_fuses(int flag)
{
    struct delayed_action *wire;
    int i;

    /*
     * Step though the list
     */
    for (i = 0; i < MAXFUSES; i++) {
        wire = &f_list[i];
        /*
         * Decrementing counters and starting things we want.  We also need
         * to remove the fuse from the list once it has gone off.
         */
        if(flag == wire->d_type && wire->d_time > 0 &&
              --wire->d_time == 0) {
            wire->d_type = EMPTY;
            if (*wire->d_func == changeclass || *wire->d_func == res_strength)
                (*wire->d_func)(wire->d_arg.i);
            else if (wire->d_func != NULL)
                (*wire->d_func)(wire->d_arg.vp);
            fusecnt -= 1;
        }
    }
}

/*
 * activity:
 *      Show wizard number of demaons and memory blocks used
 */

void
activity(void)
{
        msg("Daemons = %d : Fuses = %d : Memory Items = %d : Memory Used = %d",
            demoncnt,fusecnt,total,md_memused());
}