map.c

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/*
 * static char *rcsid_map_c =
 *   "$Id: map.c 13939 2010-09-29 19:21:57Z ryo_saeba $";
 */

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2006-2008 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The authors can be reached via e-mail at crossfire-devel@real-time.com
*/

#include <stdio.h>
#include <global.h>
#include <sproto.h>

#include <loader.h>
#ifndef WIN32 /* ---win32 exclude header */
#include <unistd.h>
#endif /* win32 */

#include "path.h"

extern int nrofallocobjects, nroffreeobjects;

static void free_all_objects(mapstruct *m);

const char *map_layer_name[MAP_LAYERS] = {
    "floor", "no_pick", "no_pick", "item", "item",
    "item", "living", "living", "fly", "fly"
};

typedef struct Map_Layer_Info {
    uint8 high_layer;
    uint8 honor_visibility;
} Map_Layer_Info;

static Map_Layer_Info map_layer_info[MAP_LAYERS] = {
    { MAP_LAYER_FLOOR, 1 },
    { MAP_LAYER_NO_PICK2, 0 }, { MAP_LAYER_NO_PICK2, 0 },
    { MAP_LAYER_ITEM3, 1 }, { MAP_LAYER_ITEM3, 1 }, { MAP_LAYER_ITEM3, 1 },
    { MAP_LAYER_LIVING2, 1 }, { MAP_LAYER_LIVING2, 1 },
    { MAP_LAYER_FLY2, 1 }, { MAP_LAYER_FLY2, 1 }
};

mapstruct *has_been_loaded(const char *name) {
    mapstruct *map;

    if (!name || !*name)
        return NULL;

    for (map = first_map; map; map = map->next)
        if (!strcmp(name, map->path))
            break;
    return (map);
}

char *create_pathname(const char *name, char *buf, size_t size) {
    /* Why?  having extra / doesn't confuse unix anyplace?  Dependancies
     * someplace else in the code? msw 2-17-97
     */
    if (*name == '/')
        snprintf(buf, size, "%s/%s%s", settings.datadir, settings.mapdir, name);
    else
        snprintf(buf, size, "%s/%s/%s", settings.datadir, settings.mapdir, name);
    return buf;
}

void create_overlay_pathname(const char *name, char *buf, size_t size) {
    /* Why?  having extra / doesn't confuse unix anyplace?  Dependancies
     * someplace else in the code? msw 2-17-97
     */
    if (*name == '/')
        snprintf(buf, size, "%s/%s%s", settings.localdir, settings.mapdir, name);
    else
        snprintf(buf, size, "%s/%s/%s", settings.localdir, settings.mapdir, name);
}

void create_template_pathname(const char *name, char *buf, size_t size) {
    /* Why?  having extra / doesn't confuse unix anyplace?  Dependancies
     * someplace else in the code? msw 2-17-97
     */
    if (*name == '/')
        snprintf(buf, size, "%s/%s%s", settings.localdir, settings.templatedir, name);
    else
        snprintf(buf, size, "%s/%s/%s", settings.localdir, settings.templatedir, name);
}

static void create_items_path(const char *s, char *buf, size_t size) {
    char *t;

    if (*s == '/')
        s++;

    snprintf(buf, size, "%s/%s/", settings.localdir, settings.uniquedir);
    t = buf+strlen(buf);
    snprintf(t, buf+size-t, "%s", s);

    while (*t != '\0') {
        if (*t == '/')
            *t = '@';
        t++;
    }
}

int check_path(const char *name, int prepend_dir) {
    char buf[MAX_BUF];
#ifndef WIN32
    char *endbuf;
    struct stat statbuf;
    int mode = 0, i;
#endif

    if (prepend_dir)
        create_pathname(name, buf, MAX_BUF);
    else
        snprintf(buf, sizeof(buf), "%s", name);
#ifdef WIN32 /* ***win32: check this sucker in windows style. */
    return(_access(buf, 0));
#else

    /* old method (strchr(buf, '\0')) seemd very odd to me -
     * this method should be equivalant and is clearer.
     * Can not use strcat because we need to cycle through
     * all the names.
     */
    endbuf = buf+strlen(buf);

    for (i = 0; i < NROF_COMPRESS_METHODS; i++) {
        if (uncomp[i][0])
            snprintf(endbuf, buf+sizeof(buf)-endbuf, "%s", uncomp[i][0]);
        else
            *endbuf = '\0';
        if (!stat(buf, &statbuf))
            break;
    }
    if (i == NROF_COMPRESS_METHODS)
        return (-1);
    if (!S_ISREG(statbuf.st_mode))
        return (-1);

    if (((statbuf.st_mode&S_IRGRP) && getegid() == statbuf.st_gid)
    || ((statbuf.st_mode&S_IRUSR) && geteuid() == statbuf.st_uid)
    || (statbuf.st_mode&S_IROTH))
        mode |= 4;

    if ((statbuf.st_mode&S_IWGRP && getegid() == statbuf.st_gid)
    || (statbuf.st_mode&S_IWUSR && geteuid() == statbuf.st_uid)
    || (statbuf.st_mode&S_IWOTH))
        mode |= 2;

    return (mode);
#endif
}

void dump_map(const mapstruct *m) {
    LOG(llevError, "Map %s status: %d.\n", m->path, m->in_memory);
    LOG(llevError, "Size: %dx%d Start: %d,%d\n", MAP_WIDTH(m), MAP_HEIGHT(m), MAP_ENTER_X(m), MAP_ENTER_Y(m));

    if (m->msg != NULL)
        LOG(llevError, "Message:\n%s", m->msg);

    if (m->maplore != NULL)
        LOG(llevError, "Lore:\n%s", m->maplore);

    if (m->tmpname != NULL)
        LOG(llevError, "Tmpname: %s\n", m->tmpname);

    LOG(llevError, "Difficulty: %d\n", m->difficulty);
    LOG(llevError, "Darkness: %d\n", m->darkness);
}

void dump_all_maps(void) {
    mapstruct *m;

    for (m = first_map; m != NULL; m = m->next) {
        dump_map(m);
    }
}

int get_map_flags(mapstruct *oldmap, mapstruct **newmap, sint16 x, sint16 y, sint16 *nx, sint16 *ny) {
    sint16 newx, newy;
    int retval = 0;
    mapstruct *mp;

    if (out_of_map(oldmap, x, y))
        return P_OUT_OF_MAP;
    newx = x;
    newy = y;
    mp = get_map_from_coord(oldmap, &newx, &newy);
    if (mp != oldmap)
        retval |= P_NEW_MAP;
    if (newmap)
        *newmap = mp;
    if (nx)
        *nx = newx;
    if (ny)
        *ny = newy;
    retval |= mp->spaces[newx+mp->width*newy].flags;
    return retval;
}

int blocked_link(object *ob, mapstruct *m, int sx, int sy) {
    object *tmp, *tmp_head;
    int mflags, blocked;

    /* Make sure the coordinates are valid - they should be, as caller should
     * have already checked this.
     */
    if (OUT_OF_REAL_MAP(m, sx, sy)) {
        LOG(llevError, "blocked_link: Passed map, x, y coordinates outside of map\n");
        return 1;
    }

    /* special hack for transports: if it's a transport with a move_type of 0, it can do on the space anyway */
    if (ob->type == TRANSPORT && ob->move_type == 0)
        return 0;

    /* Save some cycles - instead of calling get_map_flags(), just get the value
     * directly.
     */
    mflags = m->spaces[sx+m->width*sy].flags;

    blocked = GET_MAP_MOVE_BLOCK(m, sx, sy);

    /* If space is currently not blocked by anything, no need to
     * go further.  Not true for players - all sorts of special
     * things we need to do for players.
     */
    if (ob->type != PLAYER && !(mflags&P_IS_ALIVE) && (blocked == 0))
        return 0;

    /* if there isn't anytyhing alive on this space, and this space isn't
     * otherwise blocked, we can return now.  Only if there is a living
     * creature do we need to investigate if it is part of this creature
     * or another.  Likewise, only if something is blocking us do we
     * need to investigate if there is a special circumstance that would
     * let the player through (inventory checkers for example)
     */
    if (!(mflags&P_IS_ALIVE) && !OB_TYPE_MOVE_BLOCK(ob, blocked))
        return 0;

    if (ob->head != NULL)
        ob = ob->head;

    /* We basically go through the stack of objects, and if there is
     * some other object that has NO_PASS or FLAG_ALIVE set, return
     * true.  If we get through the entire stack, that must mean
     * ob is blocking it, so return 0.
     */
    for (tmp = GET_MAP_OB(m, sx, sy); tmp != NULL; tmp = tmp->above) {
        /* Never block part of self. */
        if (tmp->head)
            tmp_head = tmp->head;
        else
            tmp_head = tmp;
        if (tmp_head == ob) {
            continue;
        /* This must be before the checks below.  Code for inventory checkers. */
        } else if (tmp->type == CHECK_INV && OB_MOVE_BLOCK(ob, tmp)) {
            /* If last_sp is set, the player/monster needs an object,
             * so we check for it.  If they don't have it, they can't
             * pass through this space.
             */
            if (tmp->last_sp) {
                if (check_inv_recursive(ob, tmp) == NULL) {
                    if (tmp->msg) {
                        /* Optionally display the reason why one cannot move
                         * there.  Note: emitting a message from this function
                         * is not very elegant.  Ideally, this should be done
                         * somewhere in server/player.c, but this is difficult
                         * for objects of type CHECK_INV that are not alive.
                         */
                        draw_ext_info(NDI_UNIQUE|NDI_NAVY, 0, ob,
                                      MSG_TYPE_ATTACK, MSG_TYPE_ATTACK_NOKEY,
                                      tmp->msg, tmp->msg);
                    }
                    return 1;
                }
                else
                    continue;
            } else {
                /* In this case, the player must not have the object -
                 * if they do, they can't pass through.
                 */
                if (check_inv_recursive(ob, tmp) != NULL) {
                    if (tmp->msg) {
                        draw_ext_info(NDI_UNIQUE|NDI_NAVY, 0, ob,
                                      MSG_TYPE_ATTACK, MSG_TYPE_ATTACK_NOKEY,
                                      tmp->msg, tmp->msg);
                    }
                    return 1;
                }
                else
                    continue;
            }
        } /* if check_inv */
        else {
            /* Broke apart a big nasty if into several here to make
             * this more readable.  first check - if the space blocks
             * movement, can't move here.
             * second - if a monster, can't move there, unless it is a
             * hidden dm
             */
            if (OB_MOVE_BLOCK(ob, tmp))
                return 1;
            if (QUERY_FLAG(tmp, FLAG_ALIVE)
            && tmp->head != ob
            && tmp != ob
            && tmp->type != DOOR
            && !(QUERY_FLAG(tmp, FLAG_WIZ) && tmp->contr->hidden))
                return 1;
        }

    }
    return 0;
}

int ob_blocked(const object *ob, mapstruct *m, sint16 x, sint16 y) {
    archetype *tmp;
    int flag;
    mapstruct *m1;
    sint16  sx, sy;
    const object *part;

    if (ob == NULL) {
        flag = get_map_flags(m, &m1, x, y, &sx, &sy);
        if (flag&P_OUT_OF_MAP)
            return P_OUT_OF_MAP;

        /* don't have object, so don't know what types would block */
        return(GET_MAP_MOVE_BLOCK(m1, sx, sy));
    }

    for (tmp = ob->arch, part = ob; tmp != NULL; tmp = tmp->more, part = part->more) {
        flag = get_map_flags(m, &m1, x+tmp->clone.x, y+tmp->clone.y, &sx, &sy);

        if (flag&P_OUT_OF_MAP)
            return P_OUT_OF_MAP;
        if (flag&P_IS_ALIVE)
            return P_IS_ALIVE;

        /* find_first_free_spot() calls this function.  However, often
         * ob doesn't have any move type (when used to place exits)
         * so the AND operation in OB_TYPE_MOVE_BLOCK doesn't work.
         */

        if (ob->move_type == 0 && GET_MAP_MOVE_BLOCK(m1, sx, sy) != MOVE_ALL)
            continue;

        /* A transport without move_type for a part should go through everything for that part. */
        if (ob->type == TRANSPORT && part->move_type == 0)
            continue;

        /* Note it is intentional that we check ob - the movement type of the
         * head of the object should correspond for the entire object.
         */
        if (OB_TYPE_MOVE_BLOCK(ob, GET_MAP_MOVE_BLOCK(m1, sx, sy)))
            return AB_NO_PASS;
    }
    return 0;
}

void fix_container(object *container) {
    object *tmp = container->inv, *next;

    container->inv = NULL;
    while (tmp != NULL) {
        next = tmp->below;
        if (tmp->inv)
            fix_container(tmp);
        (void)insert_ob_in_ob(tmp, container);
        tmp = next;
    }
    /* sum_weight will go through and calculate what all the containers are
     * carrying.
     */
    sum_weight(container);
}

static void fix_container_multipart(object *container) {
    object *tmp = container->inv, *next;

    while (tmp != NULL) {
        archetype *at;
        object *op, *last;

        next = tmp->below;
        if (tmp->inv)
            fix_container_multipart(tmp);
        /* already multipart, or non-multipart arch - don't do anything more */
        for (at = tmp->arch->more, last = tmp; at != NULL; at = at->more, last = op) {
            /* FIXME: We can't reuse fix_multipart_object() since that only
             * works for items directly on maps. Maybe factor out common code?
             */
            op = arch_to_object(at);
            op->head = tmp;
            op->env = tmp->env;
            last->more = op;
            if (tmp->name != op->name) {
                if (op->name)
                    free_string(op->name);
                op->name = add_string(tmp->name);
            }
            if (tmp->title != op->title) {
                if (op->title)
                    free_string(op->title);
                op->title = add_string(tmp->title);
            }
            CLEAR_FLAG(op, FLAG_REMOVED);
        }
        tmp = next;
    }
}

static void link_multipart_objects(mapstruct *m) {
    int x, y;
    object *tmp, *above;

    for (x = 0; x < MAP_WIDTH(m); x++)
        for (y = 0; y < MAP_HEIGHT(m); y++)
            for (tmp = GET_MAP_OB(m, x, y); tmp != NULL; tmp = above) {
                above = tmp->above;
                if (tmp->inv)
                    fix_container_multipart(tmp);

                /* already multipart - don't do anything more */
                if (tmp->head || tmp->more)
                    continue;

                fix_multipart_object(tmp);
            } /* for objects on this space */
}

static void load_objects(mapstruct *m, FILE *fp, int mapflags) {
    int i, j, bufstate = LO_NEWFILE;
    int unique;
    object *op, *prev = NULL, *last_more = NULL, *otmp;

    op = get_object();
    op->map = m; /* To handle buttons correctly */

    while ((i = load_object(fp, op, bufstate, mapflags))) {
        /* Since the loading of the map header does not load an object
         * anymore, we need to pass LO_NEWFILE for the first object loaded,
         * and then switch to LO_REPEAT for faster loading.
         */
        bufstate = LO_REPEAT;

        /* if the archetype for the object is null, means that we
         * got an invalid object.  Don't do anything with it - the game
         * or editor will not be able to do anything with it either.
         */
        if (op->arch == NULL) {
            LOG(llevDebug, "Discarding object without arch: %s\n", op->name ? op->name : "(null)");
            continue;
        }

        switch (i) {
        case LL_NORMAL:
            /* if we are loading an overlay, put the floors on the bottom */
            if ((QUERY_FLAG(op, FLAG_IS_FLOOR) || QUERY_FLAG(op, FLAG_OVERLAY_FLOOR))
            && mapflags&MAP_OVERLAY)
                insert_ob_in_map(op, m, op, INS_NO_MERGE|INS_NO_WALK_ON|INS_ABOVE_FLOOR_ONLY|INS_MAP_LOAD);
            else
                insert_ob_in_map(op, m, op, INS_NO_MERGE|INS_NO_WALK_ON|INS_ON_TOP|INS_MAP_LOAD);

            if (op->inv)
                sum_weight(op);

            prev = op,
            last_more = op;
            break;

        case LL_MORE:
            insert_ob_in_map(op, m, op, INS_NO_MERGE|INS_NO_WALK_ON|INS_ABOVE_FLOOR_ONLY);
            op->head = prev,
            last_more->more = op,
            last_more = op;
            break;
        }
        if (mapflags&MAP_STYLE) {
            remove_from_active_list(op);
        }
        op = get_object();
        op->map = m;
    }
    for (i = 0; i < m->width; i++) {
        for (j = 0; j < m->height; j++) {
            unique = 0;
            /* check for unique items, or unique squares */
            for (otmp = GET_MAP_OB(m, i, j); otmp; otmp = otmp->above) {
                if (QUERY_FLAG(otmp, FLAG_UNIQUE))
                    unique = 1;
                if (!(mapflags&(MAP_OVERLAY|MAP_PLAYER_UNIQUE) || unique))
                    SET_FLAG(otmp, FLAG_OBJ_ORIGINAL);
            }
        }
    }
    free_object(op);
    link_multipart_objects(m);
}

static int save_objects(mapstruct *m, FILE *fp, FILE *fp2, int flag) {
    int i, j = 0, unique = 0, res;
    object *op,  *otmp;

    /* first pass - save one-part objects */
    for (i = 0; i < MAP_WIDTH(m); i++)
        for (j = 0; j < MAP_HEIGHT(m); j++) {
            unique = 0;
            for (op = GET_MAP_OB(m, i, j); op; op = otmp) {
                otmp = op->above;

                if (QUERY_FLAG(op, FLAG_IS_FLOOR) && QUERY_FLAG(op, FLAG_UNIQUE))
                    unique = 1;

                if (op->type == PLAYER) {
                    LOG(llevDebug, "Player on map that is being saved\n");
                    continue;
                }

                if (op->head || op->owner)
                    continue;

                if (unique || QUERY_FLAG(op, FLAG_UNIQUE))
                    res = save_object(fp2, op, SAVE_FLAG_SAVE_UNPAID|SAVE_FLAG_NO_REMOVE);
                else
                    if (flag == 0
                    || (flag == SAVE_FLAG_NO_REMOVE && (!QUERY_FLAG(op, FLAG_OBJ_ORIGINAL) && !QUERY_FLAG(op, FLAG_UNPAID))))
                        res = save_object(fp, op, SAVE_FLAG_SAVE_UNPAID|SAVE_FLAG_NO_REMOVE);

                if (res != 0)
                    return res;
            } /* for this space */
        } /* for this j */

    return 0;
}

mapstruct *get_linked_map(void) {
    mapstruct *map = (mapstruct *)calloc(1, sizeof(mapstruct));
    mapstruct *mp;

    if (map == NULL)
        fatal(OUT_OF_MEMORY);

    for (mp = first_map; mp != NULL && mp->next != NULL; mp = mp->next)
        ;
    if (mp == NULL)
        first_map = map;
    else
        mp->next = map;

    map->in_memory = MAP_SWAPPED;
    /* The maps used to pick up default x and y values from the
     * map archetype.  Mimic that behaviour.
     */
    MAP_WIDTH(map) = 16;
    MAP_HEIGHT(map) = 16;
    MAP_RESET_TIMEOUT(map) = 0;
    MAP_TIMEOUT(map) = 300;
    MAP_ENTER_X(map) = 0;
    MAP_ENTER_Y(map) = 0;
    map->last_reset_time.tv_sec = 0;
    return map;
}

static void allocate_map(mapstruct *m) {
    m->in_memory = MAP_IN_MEMORY;
    /* Log this condition and free the storage.  We could I suppose
     * realloc, but if the caller is presuming the data will be intact,
     * that is their poor assumption.
     */
    if (m->spaces) {
        LOG(llevError, "allocate_map called with already allocated map (%s)\n", m->path);
        free(m->spaces);
    }

    m->spaces = calloc(1, MAP_WIDTH(m)*MAP_HEIGHT(m)*sizeof(MapSpace));

    if (m->spaces == NULL)
        fatal(OUT_OF_MEMORY);
}

mapstruct *get_empty_map(int sizex, int sizey) {
    mapstruct *m = get_linked_map();
    m->width = sizex;
    m->height = sizey;
    m->in_memory = MAP_SWAPPED;
    allocate_map(m);
    return m;
}

static shopitems *parse_shop_string(const char *input_string) {
    char *shop_string, *p, *q, *next_semicolon, *next_colon;
    shopitems *items = NULL;
    int i = 0, number_of_entries = 0;
    const typedata *current_type;

    shop_string = strdup_local(input_string);
    p = shop_string;
    LOG(llevDebug, "parsing %s\n", input_string);
    /* first we'll count the entries, we'll need that for allocating the array shortly */
    while (p) {
        p = strchr(p, ';');
        number_of_entries++;
        if (p)
            p++;
    }
    p = shop_string;
    strip_endline(p);
    items = CALLOC(number_of_entries+1, sizeof(shopitems));
    memset(items, 0, (sizeof(shopitems)*number_of_entries+1));
    for (i = 0; i < number_of_entries; i++) {
        if (!p) {
            LOG(llevError, "parse_shop_string: I seem to have run out of string, that shouldn't happen.\n");
            break;
        }
        next_semicolon = strchr(p, ';');
        next_colon = strchr(p, ':');
        /* if there is a stregth specified, figure out what it is, we'll need it soon. */
        if (next_colon &&(!next_semicolon || next_colon < next_semicolon))
            items[i].strength = atoi(strchr(p, ':')+1);

        if (isdigit(*p) || *p == '*') {
            items[i].typenum = atoi(p); /* atoi returns 0 when we have an asterisk */
            current_type = get_typedata(items[i].typenum);
            if (current_type) {
                items[i].name = current_type->name;
                items[i].name_pl = current_type->name_pl;
            }
        } else { /*we have a named type, let's figure out what it is */
            q = strpbrk(p, ";:");
            if (q)
                *q = '\0';

            current_type = get_typedata_by_name(p);
            if (current_type) {
                items[i].name = current_type->name;
                items[i].typenum = current_type->number;
                items[i].name_pl = current_type->name_pl;
            } else { /* oh uh, something's wrong, let's free up this one, and try
                    * the next entry while we're at it, better print a warning
                    */
                LOG(llevError, "invalid type %s defined in shopitems in string %s\n", p, input_string);
            }
        }
        items[i].index = number_of_entries;
        if (next_semicolon)
            p = ++next_semicolon;
        else
            p = NULL;
    }
    free(shop_string);
    return items;
}

static void print_shop_string(mapstruct *m, char *output_string, int size) {
    int i;
    char tmp[MAX_BUF];

    output_string[0] = '\0';
    for (i = 0; i < m->shopitems[0].index; i++) {
        if (m->shopitems[i].typenum) {
            if (m->shopitems[i].strength) {
                snprintf(tmp, sizeof(tmp), "%s:%d;", m->shopitems[i].name, m->shopitems[i].strength);
            } else
                snprintf(tmp, sizeof(tmp), "%s;", m->shopitems[i].name);
        } else {
            if (m->shopitems[i].strength) {
                snprintf(tmp, sizeof(tmp), "*:%d;", m->shopitems[i].strength);
            } else
                snprintf(tmp, sizeof(tmp), "*");
        }
        snprintf(output_string+strlen(output_string), size-strlen(output_string), "%s", tmp);
    }
}

static int load_map_header(FILE *fp, mapstruct *m) {
    char buf[HUGE_BUF], *key = NULL, *value;

    m->width = m->height = 0;
    while (fgets(buf, sizeof(buf), fp) != NULL) {
        char *p;

        p = strchr(buf, '\n');
        if (p == NULL) {
            LOG(llevError, "Error loading map header - did not find a newline - perhaps file is truncated?  Buf=%s\n", buf);
            return 1;
        }
        *p = '\0';

        key = buf;
        while (isspace(*key))
            key++;
        if (*key == 0)
            continue;    /* empty line */
        value = strchr(key, ' ');
        if (value) {
            *value = 0;
            value++;
            while (isspace(*value)) {
                value++;
                if (*value == '\0') {
                    /* Nothing but spaces. */
                    value = NULL;
                    break;
                }
            }
        }

        /* key is the field name, value is what it should be set
         * to.  We've already done the work to null terminate key,
         * and strip off any leading spaces for both of these.
         * We have not touched the newline at the end of the line -
         * these are needed for some values.  the end pointer
         * points to the first of the newlines.
         * value could be NULL!  It would be easy enough to just point
         * this to "" to prevent cores, but that would let more errors slide
         * through.
         *
         * First check for entries that do not use the value parameter, then
         * validate that value is given and check for the remaining entries
         * that use the parameter.
         */

        if (!strcmp(key, "msg")) {
            char msgbuf[HUGE_BUF];
            int msgpos = 0;

            while (fgets(buf, sizeof(buf), fp) != NULL) {
                if (!strcmp(buf, "endmsg\n"))
                    break;
                else {
                    snprintf(msgbuf+msgpos, sizeof(msgbuf)-msgpos, "%s", buf);
                    msgpos += strlen(buf);
                }
            }
            /* There are lots of maps that have empty messages (eg, msg/endmsg
             * with nothing between).  There is no reason in those cases to
             * keep the empty message.  Also, msgbuf contains garbage data
             * when msgpos is zero, so copying it results in crashes
             */
            if (msgpos != 0) {
                /* When loading eg an overlay, message is already set, so free() current one. */
                free(m->msg);
                m->msg = strdup_local(msgbuf);
            }
        } else if (!strcmp(key, "maplore")) {
            char maplorebuf[HUGE_BUF];
            int maplorepos = 0;

            while (fgets(buf, HUGE_BUF-1, fp) != NULL) {
                if (!strcmp(buf, "endmaplore\n"))
                    break;
                else {
                    snprintf(maplorebuf+maplorepos, sizeof(maplorebuf)-maplorepos, "%s", buf);
                    maplorepos += strlen(buf);
                }
            }
            if (maplorepos != 0)
                m->maplore = strdup_local(maplorebuf);
        } else if (!strcmp(key, "end")) {
            break;
        } else if (value == NULL) {
            LOG(llevError, "Got '%s' line without parameter in map header\n", key);
        } else if (!strcmp(key, "arch")) {
            /* This is an oddity, but not something we care about much. */
            if (strcmp(value, "map"))
                LOG(llevError, "loading map and got a non 'arch map' line(%s %s)?\n", key, value);
        } else if (!strcmp(key, "name")) {
            /* When loading eg an overlay, the name is already set, so free() current one. */
            free(m->name);
            m->name = strdup_local(value);
        /* first strcmp value on these are old names supported
         * for compatibility reasons.  The new values (second) are
         * what really should be used.
         */
        } else if (!strcmp(key, "hp") || !strcmp(key, "enter_x")) {
            m->enter_x = atoi(value);
        } else if (!strcmp(key, "sp") || !strcmp(key, "enter_y")) {
            m->enter_y = atoi(value);
        } else if (!strcmp(key, "x") || !strcmp(key, "width")) {
            m->width = atoi(value);
        } else if (!strcmp(key, "y") || !strcmp(key, "height")) {
            m->height = atoi(value);
        } else if (!strcmp(key, "weight") || !strcmp(key, "reset_timeout")) {
            m->reset_timeout = atoi(value);
        } else if (!strcmp(key, "value") || !strcmp(key, "swap_time")) {
            m->timeout = atoi(value);
        } else if (!strcmp(key, "level") || !strcmp(key, "difficulty")) {
            m->difficulty = atoi(value);
        } else if (!strcmp(key, "invisible") || !strcmp(key, "darkness")) {
            m->darkness = atoi(value);
        } else if (!strcmp(key, "stand_still") || !strcmp(key, "fixed_resettime")) {
            m->fixed_resettime = atoi(value);
        } else if (!strcmp(key, "unique")) {
            m->unique = atoi(value);
        } else if (!strcmp(key, "template")) {
            m->is_template = atoi(value);
        } else if (!strcmp(key, "region")) {
            m->region = get_region_by_name(value);
        } else if (!strcmp(key, "shopitems")) {
            m->shopitems = parse_shop_string(value);
        } else if (!strcmp(key, "shopgreed")) {
            m->shopgreed = atof(value);
        } else if (!strcmp(key, "shopmin")) {
            m->shopmin = atol(value);
        } else if (!strcmp(key, "shopmax")) {
            m->shopmax = atol(value);
        } else if (!strcmp(key, "shoprace")) {
            m->shoprace = strdup_local(value);
        } else if (!strcmp(key, "outdoor")) {
            m->outdoor = atoi(value);
        } else if (!strcmp(key, "nosmooth")) {
            m->nosmooth = atoi(value);
        } else if (!strcmp(key, "first_load")) {
            m->last_reset_time.tv_sec = atoi(value);
        } else if (!strncmp(key, "tile_path_", 10)) {
            int tile = atoi(key+10);

            if (tile < 1 || tile > 4) {
                LOG(llevError, "load_map_header: tile location %d out of bounds (%s)\n", tile, m->path);
            } else {
                char path[HUGE_BUF];

                if (m->tile_path[tile-1]) {
                    LOG(llevError, "load_map_header: tile location %d duplicated (%s)\n", tile, m->path);
                    free(m->tile_path[tile-1]);
                    m->tile_path[tile-1] = NULL;
                }

                if (check_path(value, 1) != -1) {
                    /* The unadorned path works. */
                    snprintf(path, sizeof(path), "%s", value);
                } else {
                    /* Try again; it could be a relative exit. */
                    path_combine_and_normalize(m->path, value, path, sizeof(path));

                    if (check_path(path, 1) == -1) {
                        LOG(llevError, "get_map_header: Bad tile path %s %s\n", m->path, value);
                        path[0] = '\0';
                    }
                }

                if (*path != '\0') {
                    /* Use the normalized value. */
                    m->tile_path[tile-1] = strdup_local(path);
                }
            } /* end if tile direction (in)valid */
        } else  if (!strcmp(key, "background_music")) {
            m->background_music = strdup_local(value);
        } else {
            LOG(llevError, "Got unknown value in map header: %s %s\n", key, value);
        }
    }
    if ((m->width == 0) || (m->height == 0)) {
        LOG(llevError, "Map width or height not specified\n");
        return 1;
    }
    if (!key || strcmp(key, "end")) {
        LOG(llevError, "Got premature eof on map header!\n");
        return 1;
    }
    return 0;
}

mapstruct *load_original_map(const char *filename, int flags) {
    FILE *fp;
    mapstruct *m;
    int comp;
    char pathname[MAX_BUF];

    LOG(llevDebug, "load_original_map: %s (%x)\n", filename, flags);
    if (flags&MAP_PLAYER_UNIQUE)
        snprintf(pathname, sizeof(pathname), "%s", filename);
    else if (flags&MAP_OVERLAY)
        create_overlay_pathname(filename, pathname, MAX_BUF);
    else
        create_pathname(filename, pathname, MAX_BUF);

    if ((fp = open_and_uncompress(pathname, 0, &comp)) == NULL) {
        char err[MAX_BUF];

        LOG((flags&MAP_PLAYER_UNIQUE) ? llevDebug : llevError, "Can't open %s: %s\n", pathname, strerror_local(errno, err, sizeof(err)));
        return (NULL);
    }

    m = get_linked_map();

    strcpy(m->path, filename);
    if (load_map_header(fp, m)) {
        LOG(llevError, "Error loading map header for %s, flags=%d\n", filename, flags);
        delete_map(m);
        return NULL;
    }

    allocate_map(m);
    m->compressed = comp;

    m->in_memory = MAP_LOADING;
    load_objects(m, fp, flags&(MAP_BLOCK|MAP_STYLE));
    close_and_delete(fp, comp);
    m->in_memory = MAP_IN_MEMORY;
    if (!MAP_DIFFICULTY(m))
        MAP_DIFFICULTY(m) = calculate_difficulty(m);
    set_map_reset_time(m);

    /* In case other objects press some buttons down */
    update_buttons(m);

    /* Handle for map load event */
    execute_global_event(EVENT_MAPLOAD, m);

    return (m);
}

static mapstruct *load_temporary_map(mapstruct *m) {
    FILE *fp;
    int comp;
    char buf[MAX_BUF];

    if (!m->tmpname) {
        LOG(llevError, "No temporary filename for map %s\n", m->path);
        snprintf(buf, sizeof(buf), "%s", m->path);
        delete_map(m);
        m = load_original_map(buf, 0);
        if (m == NULL)
            return NULL;
        fix_auto_apply(m); /* Chests which open as default */
        return m;
    }

    if ((fp = open_and_uncompress(m->tmpname, 0, &comp)) == NULL) {
        LOG(llevError, "Cannot open %s: %s\n", m->tmpname, strerror_local(errno, buf, sizeof(buf)));
        snprintf(buf, sizeof(buf), "%s", m->path);
        delete_map(m);
        m = load_original_map(buf, 0);
        if (m == NULL)
            return NULL;
        fix_auto_apply(m); /* Chests which open as default */
        return m;
    }

    if (load_map_header(fp, m)) {
        LOG(llevError, "Error loading map header for %s (%s)\n", m->path, m->tmpname);
        delete_map(m);
        m = load_original_map(m->path, 0);
        return NULL;
    }
    m->compressed = comp;
    allocate_map(m);

    m->in_memory = MAP_LOADING;
    load_objects(m, fp, 0);
    close_and_delete(fp, comp);
    m->in_memory = MAP_IN_MEMORY;
    return m;
}

static mapstruct *load_overlay_map(const char *filename, mapstruct *m) {
    FILE *fp;
    int comp;
    char pathname[MAX_BUF];

    create_overlay_pathname(filename, pathname, MAX_BUF);

    if ((fp = open_and_uncompress(pathname, 0, &comp)) == NULL) {
        /* LOG(llevDebug, "Can't open overlay %s\n", pathname);*/
        return m;
    }

    if (load_map_header(fp, m)) {
        LOG(llevError, "Error loading map header for overlay %s (%s)\n", m->path, pathname);
        delete_map(m);
        m = load_original_map(m->path, 0);
        return NULL;
    }
    m->compressed = comp;
    /*allocate_map(m);*/

    m->in_memory = MAP_LOADING;
    load_objects(m, fp, MAP_OVERLAY);
    close_and_delete(fp, comp);
    m->in_memory = MAP_IN_MEMORY;
    return m;
}

/******************************************************************************
 * This is the start of unique map handling code
 *****************************************************************************/

static void delete_unique_items(mapstruct *m) {
    int i, j, unique = 0;
    object *op, *next;

    for (i = 0; i < MAP_WIDTH(m); i++)
        for (j = 0; j < MAP_HEIGHT(m); j++) {
            unique = 0;
            for (op = GET_MAP_OB(m, i, j); op; op = next) {
                next = op->above;
                if (QUERY_FLAG(op, FLAG_IS_FLOOR) && QUERY_FLAG(op, FLAG_UNIQUE))
                    unique = 1;
                if (op->head == NULL && (QUERY_FLAG(op, FLAG_UNIQUE) || unique)) {
                    clean_object(op);
                    if (QUERY_FLAG(op, FLAG_IS_LINKED))
                        remove_button_link(op);
                    remove_ob(op);
                    free_object(op);
                }
            }
        }
}

static void load_unique_objects(mapstruct *m) {
    FILE *fp;
    int comp, count;
    char firstname[MAX_BUF], name[MAX_BUF];

    create_items_path(m->path, name, MAX_BUF);
    for (count = 0; count < 10; count++) {
        snprintf(firstname, sizeof(firstname), "%s.v%02d", name, count);
        if (!access(firstname, R_OK))
            break;
    }
    /* If we get here, we did not find any map */
    if (count == 10)
        return;

    if ((fp = open_and_uncompress(firstname, 0, &comp)) == NULL) {
        /* There is no expectation that every map will have unique items, but this
        * is debug output, so leave it in.
        */
        LOG(llevDebug, "Can't open unique items file for %s\n", name);
        return;
    }

    m->in_memory = MAP_LOADING;
    if (m->tmpname == NULL)    /* if we have loaded unique items from */
        delete_unique_items(m); /* original map before, don't duplicate them */
    load_object(fp, NULL, LO_NOREAD, 0);
    load_objects(m, fp, 0);
    close_and_delete(fp, comp);
    m->in_memory = MAP_IN_MEMORY;
}

int save_map(mapstruct *m, int flag) {
#define TEMP_EXT ".savefile"
    FILE *fp, *fp2;
    char filename[MAX_BUF], buf[MAX_BUF], shop[MAX_BUF], final[MAX_BUF];
    int i, res;

    if (flag && !*m->path) {
        LOG(llevError, "Tried to save map without path.\n");
        return SAVE_ERROR_NO_PATH;
    }

    if (flag != SAVE_MODE_NORMAL || (m->unique) || (m->is_template)) {
        if (!m->unique && !m->is_template) { /* flag is set */
            if (flag == SAVE_MODE_OVERLAY)
                create_overlay_pathname(m->path, filename, MAX_BUF);
            else
                create_pathname(m->path, filename, MAX_BUF);
        } else
            snprintf(filename, sizeof(filename), "%s", m->path);

        /* If the compression suffix already exists on the filename, don't
         * put it on again.  This nasty looking strcmp checks to see if the
         * compression suffix is at the end of the filename already.
         */
        if (m->compressed
        && strcmp((filename+strlen(filename)-strlen(uncomp[m->compressed][0])), uncomp[m->compressed][0]))
            strcat(filename, uncomp[m->compressed][0]);
        make_path_to_file(filename);
    } else {
        if (!m->tmpname)
            m->tmpname = tempnam_local(settings.tmpdir, NULL);
        snprintf(filename, sizeof(filename), "%s", m->tmpname);
    }
    LOG(llevDebug, "Saving map %s\n", m->path);
    m->in_memory = MAP_SAVING;

    /* Compress if it isn't a temporary save.  Do compress if unique */
    if (m->compressed && (m->unique || m->is_template || flag != SAVE_MODE_NORMAL)) {
        char buf[MAX_BUF];
        snprintf(buf, sizeof(buf), "%s > %s%s", uncomp[m->compressed][2], filename, TEMP_EXT);
        snprintf(final, sizeof(final), "%s", filename);
        fp = popen(buf, "w");
    } else {
        snprintf(final, sizeof(final), "%s", filename);
        snprintf(filename, sizeof(filename), "%s%s", final, TEMP_EXT);
        fp = fopen(filename, "w");
    }

    if (fp == NULL) {
        LOG(llevError, "Cannot open regular objects file %s: %s\n", filename, strerror_local(errno, buf, sizeof(buf)));
        return SAVE_ERROR_RCREATION;
    }

    /* legacy */
    fprintf(fp, "arch map\n");
    if (m->name) fprintf(fp, "name %s\n", m->name);
    if (!flag) fprintf(fp, "swap_time %d\n", m->swap_time);
    if (m->reset_timeout) fprintf(fp, "reset_timeout %u\n", m->reset_timeout);
    if (m->fixed_resettime) fprintf(fp, "fixed_resettime %d\n", m->fixed_resettime);
    /* we unfortunately have no idea if this is a value the creator set
     * or a difficulty value we generated when the map was first loaded
     */
    if (m->difficulty) fprintf(fp, "difficulty %d\n", m->difficulty);
    if (m->region) fprintf(fp, "region %s\n", m->region->name);
    if (m->shopitems) {
        print_shop_string(m, shop, sizeof(shop));
        fprintf(fp, "shopitems %s\n", shop);
    }
    if (m->shopgreed) fprintf(fp, "shopgreed %f\n", m->shopgreed);
    if (m->shopmin) fprintf(fp, "shopmin %"FMT64U"\n", m->shopmin);
    if (m->shopmax) fprintf(fp, "shopmax %"FMT64U"\n", m->shopmax);
    if (m->shoprace) fprintf(fp, "shoprace %s\n", m->shoprace);
    if (m->darkness) fprintf(fp, "darkness %d\n", m->darkness);
    if (m->width) fprintf(fp, "width %d\n", m->width);
    if (m->height) fprintf(fp, "height %d\n", m->height);
    if (m->enter_x) fprintf(fp, "enter_x %d\n", m->enter_x);
    if (m->enter_y) fprintf(fp, "enter_y %d\n", m->enter_y);
    if (m->msg) fprintf(fp, "msg\n%sendmsg\n", m->msg);
    if (m->maplore) fprintf(fp, "maplore\n%sendmaplore\n", m->maplore);
    if (m->unique) fprintf(fp, "unique %d\n", m->unique);
    if (m->is_template) fprintf(fp, "template %d\n", m->is_template);
    if (m->outdoor) fprintf(fp, "outdoor %d\n", m->outdoor);
    if (m->nosmooth) fprintf(fp, "nosmooth %d\n", m->nosmooth);
    if (m->last_reset_time.tv_sec) fprintf(fp, "first_load %d\n", (int)m->last_reset_time.tv_sec);
    if (m->background_music) fprintf(fp, "background_music %s\n", m->background_music);

    /* Save any tiling information, except on overlays */
    if (flag != SAVE_MODE_OVERLAY)
        for (i = 0; i < 4; i++)
            if (m->tile_path[i])
                fprintf(fp, "tile_path_%d %s\n", i+1, m->tile_path[i]);

    fprintf(fp, "end\n");

    /* In the game save unique items in the different file, but
     * in the editor save them to the normal map file.
     * If unique map, save files in the proper destination (set by
     * player)
     */
    fp2 = fp; /* save unique items into fp2 */
    if ((flag == SAVE_MODE_NORMAL || flag == SAVE_MODE_OVERLAY) && !m->unique && !m->is_template) {
        char name[MAX_BUF], final_unique[MAX_BUF];

        create_items_path(m->path, name, MAX_BUF);
        snprintf(final_unique, sizeof(final_unique), "%s.v00", name);
        snprintf(buf, sizeof(buf), "%s%s", final_unique, TEMP_EXT);
        if ((fp2 = fopen(buf, "w")) == NULL) {
            LOG(llevError, "Can't open unique items file %s\n", buf);
            return SAVE_ERROR_UCREATION;
        }
        if (flag == SAVE_MODE_OVERLAY) {
            /* SO_FLAG_NO_REMOVE is non destructive save, so map is still valid. */
            res = save_objects(m, fp, fp2, SAVE_FLAG_NO_REMOVE);
            if (res < 0) {
                LOG(llevError, "Save error during object save: %d\n", res);
                return res;
            }
            m->in_memory = MAP_IN_MEMORY;
        } else {
            res = save_objects(m, fp, fp2, 0);
            if (res < 0) {
                LOG(llevError, "Save error during object save: %d\n", res);
                return res;
            }
            free_all_objects(m);
        }
        if (fp2 != NULL) {
            if (ftell(fp2) == 0) {
                fclose(fp2);
                unlink(buf);
                /* If there are no unique items left on the map, we need to
                 * unlink the original unique map so that the unique
                 * items don't show up again.
                 */
                unlink(final_unique);
            } else {
                fflush(fp2);
                fclose(fp2);
                unlink(final_unique); /* failure isn't too bad, maybe the file doesn't exist. */
                if (rename(buf, final_unique) == -1) {
                    LOG(llevError, "Couldn't rename unique file %s to %s\n", buf, final_unique);
                    return SAVE_ERROR_URENAME;
                }
                chmod(final_unique, SAVE_MODE);
            }
        }
    } else { /* save same file when not playing, like in editor */
        res = save_objects(m, fp, fp, 0);
        if (res < 0) {
            LOG(llevError, "Save error during object save: %d\n", res);
            return res;
        }
        free_all_objects(m);
    }

    if (m->compressed && (m->unique || m->is_template || flag != SAVE_MODE_NORMAL)) {
        fflush(fp);
        if (pclose(fp) == -1) {
            LOG(llevError, "pclose error!\n");
            return SAVE_ERROR_CLOSE;
        }
    } else {
        fflush(fp);
        if (fclose(fp) != 0) {
            LOG(llevError, "fclose error!\n");
            return SAVE_ERROR_CLOSE;
        }
    }
    unlink(final); /* failure isn't too bad, maybe the file doesn't exist. */
    if (rename(filename, final) == -1) {
        LOG(llevError, "Couldn't rename regular file %s to %s\n", filename, final);
        return SAVE_ERROR_RRENAME;
    }

    chmod(final, SAVE_MODE);
    return SAVE_ERROR_OK;
}

void clean_object(object *op) {
    object *tmp, *next;

    for (tmp = op->inv; tmp; tmp = next) {
        next = tmp->below;
        clean_object(tmp);
        if (QUERY_FLAG(tmp, FLAG_IS_LINKED))
            remove_button_link(tmp);
        remove_ob(tmp);
        free_object(tmp);
    }
}

static void free_all_objects(mapstruct *m) {
    int i, j;
    object *op;

    for (i = 0; i < MAP_WIDTH(m); i++)
        for (j = 0; j < MAP_HEIGHT(m); j++) {
            object *previous_obj = NULL;

            while ((op = GET_MAP_OB(m, i, j)) != NULL) {
                if (op == previous_obj) {
                    LOG(llevDebug, "free_all_objects: Link error, bailing out.\n");
                    break;
                }
                previous_obj = op;
                if (op->head != NULL)
                    op = op->head;

                /* If the map isn't in memory, free_object will remove and
                * free objects in op's inventory.  So let it do the job.
                */
                if (m->in_memory == MAP_IN_MEMORY)
                    clean_object(op);
                remove_ob(op);
                free_object(op);
            }
        }
#ifdef MANY_CORES
    /* I see periodic cores on metalforge where a map has been swapped out, but apparantly
     * an item on that map was not saved - look for that condition and die as appropriate -
     * this leaves more of the map data intact for better debugging.
     */
    for (op = objects; op != NULL; op = op->next) {
        if (!QUERY_FLAG(op, FLAG_REMOVED) && op->map == m) {
            LOG(llevDebug, "free_all_objects: object %s still on map after it should have been freed\n", op->name);
            abort();
        }
    }
#endif
}

void free_map(mapstruct *m) {
    int i;

    if (!m->in_memory) {
        LOG(llevError, "Trying to free freed map.\n");
        return;
    }

    /* Handle for plugin map unload event. */
    execute_global_event(EVENT_MAPUNLOAD, m);

    if (m->spaces) free_all_objects(m);
    if (m->name) FREE_AND_CLEAR(m->name);
    if (m->spaces) FREE_AND_CLEAR(m->spaces);
    if (m->msg) FREE_AND_CLEAR(m->msg);
    if (m->maplore) FREE_AND_CLEAR(m->maplore);
    if (m->shopitems) FREE_AND_CLEAR(m->shopitems);
    if (m->shoprace) FREE_AND_CLEAR(m->shoprace);
    if (m->background_music) FREE_AND_CLEAR(m->background_music);
    if (m->buttons) free_objectlinkpt(m->buttons);
    m->buttons = NULL;
    for (i = 0; i < 4; i++) {
        if (m->tile_path[i])
            FREE_AND_CLEAR(m->tile_path[i]);
        m->tile_map[i] = NULL;
    }
    m->in_memory = MAP_SWAPPED;
}

void delete_map(mapstruct *m) {
    mapstruct *tmp, *last;
    int i;

    if (!m)
        return;
    if (m->in_memory == MAP_IN_MEMORY) {
        /* change to MAP_SAVING, even though we are not,
         * so that remove_ob doesn't do as much work.
         */
        m->in_memory = MAP_SAVING;
        free_map(m);
    }
    /* move this out of free_map, since tmpname can still be needed if
     * the map is swapped out.
     */
    if (m->tmpname) {
        free(m->tmpname);
        m->tmpname = NULL;
    }
    last = NULL;
    /* We need to look through all the maps and see if any maps
     * are pointing at this one for tiling information.  Since
     * tiling can be assymetric, we just can not look to see which
     * maps this map tiles with and clears those.
     */
    for (tmp = first_map; tmp != NULL; tmp = tmp->next) {
        if (tmp->next == m)
            last = tmp;

        /* This should hopefully get unrolled on a decent compiler */
        for (i = 0; i < 4; i++)
            if (tmp->tile_map[i] == m)
                tmp->tile_map[i] = NULL;
    }

    /* If last is null, then this should be the first map in the list */
    if (!last) {
        if (m == first_map)
            first_map = m->next;
        else
            /* m->path is a static char, so should hopefully still have
            * some useful data in it.
            */
            LOG(llevError, "delete_map: Unable to find map %s in list\n", m->path);
    } else
        last->next = m->next;

    free(m);
}

mapstruct *ready_map_name(const char *name, int flags) {
    mapstruct *m;

    if (!name)
        return (NULL);

    /* Have we been at this level before? */
    m = has_been_loaded(name);

    /* Map is good to go, so just return it */
    if (m && (m->in_memory == MAP_LOADING || m->in_memory == MAP_IN_MEMORY)) {
        return m;
    }

    /* unique maps always get loaded from their original location, and never
     * a temp location.  Likewise, if map_flush is set, or we have never loaded
     * this map, load it now.  I removed the reset checking from here -
     * it seems the probability of a player trying to enter a map that should
     * reset but hasn't yet is quite low, and removing that makes this function
     * a bit cleaner (and players probably shouldn't rely on exact timing for
     * resets in any case - if they really care, they should use the 'maps command.
     */
    if ((flags&(MAP_FLUSH|MAP_PLAYER_UNIQUE)) || !m) {

        /* first visit or time to reset */
        if (m) {
            clean_tmp_map(m); /* Doesn't make much difference */
            delete_map(m);
        }

        /* create and load a map */
        if (flags&MAP_PLAYER_UNIQUE)
            LOG(llevDebug, "Trying to load map %s.\n", name);
        else {
            char fullpath[MAX_BUF];

            create_pathname(name, fullpath, MAX_BUF);
            LOG(llevDebug, "Trying to load map %s.\n", fullpath);
        }

        if (!(m = load_original_map(name, (flags&MAP_PLAYER_UNIQUE))))
            return (NULL);

        fix_auto_apply(m); /* Chests which open as default */

        /* If a player unique map, no extra unique object file to load.
         * if from the editor, likewise.
         */
        if (!(flags&(MAP_FLUSH|MAP_PLAYER_UNIQUE)))
            load_unique_objects(m);

        if (!(flags&(MAP_FLUSH|MAP_PLAYER_UNIQUE|MAP_OVERLAY))) {
            m = load_overlay_map(name, m);
            if (m == NULL)
                return NULL;
        }
    } else {
        /* If in this loop, we found a temporary map, so load it up. */

        m = load_temporary_map(m);
        if (m == NULL)
            return NULL;
        load_unique_objects(m);

        clean_tmp_map(m);
        m->in_memory = MAP_IN_MEMORY;
        /* tempnam() on sun systems (probably others) uses malloc
        * to allocated space for the string.  Free it here.
        * In some cases, load_temporary_map above won't find the
        * temporary map, and so has reloaded a new map.  If that
        * is the case, tmpname is now null
        */
        if (m->tmpname)
            free(m->tmpname);
        m->tmpname = NULL;
        /* It's going to be saved anew anyway */
    }

    /* Below here is stuff common to both first time loaded maps and
     * temp maps.
     */

    decay_objects(m); /* start the decay */

    if (m->outdoor)
        set_darkness_map(m);
    if (!(flags&(MAP_FLUSH))) {
        if (m->last_reset_time.tv_sec == 0)
            gettimeofday(&(m->last_reset_time), NULL);
    }
    return m;
}

int calculate_difficulty(mapstruct *m) {
    object *op;
    archetype *at;
    int x, y;
    int diff = 0;
    int i;
    sint64 exp_pr_sq, total_exp = 0;

    if (MAP_DIFFICULTY(m)) {
        return MAP_DIFFICULTY(m);
    }

    for (x = 0; x < MAP_WIDTH(m); x++)
        for (y = 0; y < MAP_HEIGHT(m); y++)
            for (op = GET_MAP_OB(m, x, y); op != NULL; op = op->above) {
                if (QUERY_FLAG(op, FLAG_MONSTER))
                    total_exp += op->stats.exp;
                if (QUERY_FLAG(op, FLAG_GENERATOR)) {
                    total_exp += op->stats.exp;
                    at = get_archetype_by_type_subtype(GENERATE_TYPE(op), -1);
                    if (at != NULL)
                        total_exp += at->clone.stats.exp*8;
                }
            }

    exp_pr_sq = ((double)1000*total_exp)/(MAP_WIDTH(m)*MAP_HEIGHT(m)+1);
    diff = 20;
    for (i = 1; i < 20; i++)
        if (exp_pr_sq <= level_exp(i, 1.0)) {
            diff = i;
            break;
        }

    return diff;
}

void clean_tmp_map(mapstruct *m) {
    if (m->tmpname == NULL)
        return;
    (void)unlink(m->tmpname);
}

void free_all_maps(void) {
    int real_maps = 0;

    while (first_map) {
        /* I think some of the callers above before it gets here set this to be
         * saving, but we still want to free this data
         */
        if (first_map->in_memory == MAP_SAVING)
            first_map->in_memory = MAP_IN_MEMORY;
        delete_map(first_map);
        real_maps++;
    }
    LOG(llevDebug, "free_all_maps: Freed %d maps\n", real_maps);
}

int change_map_light(mapstruct *m, int change) {
    int new_level = m->darkness+change;

    /* Nothing to do */
    if (!change
    || (new_level <= 0 && m->darkness == 0)
    || (new_level >= MAX_DARKNESS && m->darkness >= MAX_DARKNESS)) {
        return 0;
    }

    /* inform all players on the map */
    if (change > 0)
        ext_info_map(NDI_BLACK, m, MSG_TYPE_MISC, MSG_SUBTYPE_NONE, "It becomes darker.", NULL);
    else
        ext_info_map(NDI_BLACK, m, MSG_TYPE_MISC, MSG_SUBTYPE_NONE, "It becomes brighter.", NULL);

    /* Do extra checking.  since m->darkness is a unsigned value,
     * we need to be extra careful about negative values.
     * In general, the checks below are only needed if change
     * is not +/-1
     */
    if (new_level < 0)
        m->darkness = 0;
    else if (new_level >= MAX_DARKNESS)
        m->darkness = MAX_DARKNESS;
    else
        m->darkness = new_level;

    /* All clients need to get re-updated for the change */
    update_all_map_los(m);
    return 1;
}

static inline void add_face_layer(int low_layer, int high_layer, object *ob, object *layers[], int honor_visibility) {
    int l, l1;
    object *tmp;

    for (l = low_layer; l <= high_layer; l++) {
        if (!layers[l]) {
            /* found an empty spot.  now, we want to make sure
             * highest visibility at top, etc.
             */
            layers[l] = ob;
            if (!honor_visibility)
                return;

            /* This is basically a mini bubble sort.  Only swap
             * position if the lower face has greater (not equal)
             * visibility - map stacking is secondary consideration here.
             */
            for (l1 = (l-1); l1 >= low_layer; l1--) {
                if (layers[l1]->face->visibility > layers[l1+1]->face->visibility) {
                    tmp = layers[l1+1];
                    layers[l1+1] = layers[l1];
                    layers[l1] = tmp;
                }
            }
            /* Nothing more to do - face inserted */
            return;
        }
    }
    /* If we get here, all the layers have an object..
     */
    if (!honor_visibility) {
        /* Basically, in this case, it is pure stacking logic, so
        * new object goes on the top.
        */
        for (l = low_layer; l < high_layer; l++)
            layers[l] = layers[l+1];
        layers[high_layer] = ob;
    /* If this object doesn't have higher visibility than
     * the lowest object, no reason to go further.
     */
    } else if (ob->face->visibility >= layers[low_layer]->face->visibility) {
        /*
         * Start at the top (highest visibility) layer and work down.
         * once this face exceed that of the layer, push down those
         * other layers, and then replace the layer with our object.
         */
        for (l = high_layer; l >= low_layer; l--) {
            if (ob->face->visibility >= layers[l]->face->visibility) {
                for (l1 = low_layer; l1 < l; l1++)
                    layers[l1] = layers[l1+1];
                layers[l] = ob;
                break;
            }
        }
    }
}

void update_position(mapstruct *m, int x, int y) {
    object *tmp, *player = NULL;
    uint8 flags = 0, oldflags, light = 0;
    object *layers[MAP_LAYERS];

    MoveType move_block = 0, move_slow = 0, move_on = 0, move_off = 0, move_allow = 0;

    oldflags = GET_MAP_FLAGS(m, x, y);
    if (!(oldflags&P_NEED_UPDATE)) {
        LOG(llevDebug, "update_position called with P_NEED_UPDATE not set: %s (%d, %d)\n", m->path, x, y);
        return;
    }

    memset(layers, 0, MAP_LAYERS*sizeof(object *));

    for (tmp = GET_MAP_OB(m, x, y); tmp; tmp = tmp->above) {

        /* DMs just don't do anything when hidden, including no light. */
        if (QUERY_FLAG(tmp, FLAG_WIZ) && tmp->contr->hidden)
            continue;

        if (tmp->type == PLAYER)
            player = tmp;

        /* This could be made additive I guess (two lights better than
         * one).  But if so, it shouldn't be a simple additive - 2
         * light bulbs do not illuminate twice as far as once since
         * it is a dissipation factor that is squared (or is it cubed?)
         */
        if (tmp->glow_radius > light)
            light = tmp->glow_radius;

        /* if this object is visible and not a blank face,
        * update the objects that show how this space
        * looks.
        */
        if (!tmp->invisible && tmp->face != blank_face) {
            if (tmp->map_layer) {
                add_face_layer(tmp->map_layer, map_layer_info[tmp->map_layer].high_layer,
                               tmp, layers, map_layer_info[tmp->map_layer].honor_visibility);
            } else if (tmp->move_type&MOVE_FLYING) {
                add_face_layer(MAP_LAYER_FLY1, MAP_LAYER_FLY2, tmp, layers, 1);
            } else if ((tmp->type == PLAYER || QUERY_FLAG(tmp, FLAG_MONSTER))) {
                add_face_layer(MAP_LAYER_LIVING1, MAP_LAYER_LIVING2, tmp, layers, 1);
            } else if (QUERY_FLAG(tmp, FLAG_IS_FLOOR)) {
                layers[MAP_LAYER_FLOOR] = tmp;
                /* floors hide everything else */
                memset(layers+1, 0, (MAP_LAYERS-1)*sizeof(object *));
            /* Check for FLAG_SEE_ANYWHERE is removed - objects
             * with that flag should just have a high visibility
             * set - we shouldn't need special code here.
             */
            } else if (QUERY_FLAG(tmp, FLAG_NO_PICK)) {
                add_face_layer(MAP_LAYER_NO_PICK1, MAP_LAYER_NO_PICK2, tmp, layers, 0);
            } else {
                add_face_layer(MAP_LAYER_ITEM1, MAP_LAYER_ITEM3, tmp, layers, 1);
            }
        }
        if (tmp == tmp->above) {
            LOG(llevError, "Error in structure of map\n");
            exit(-1);
        }

        move_slow |= tmp->move_slow;
        move_block |= tmp->move_block;
        move_on |= tmp->move_on;
        move_off |= tmp->move_off;
        move_allow |= tmp->move_allow;

        if (QUERY_FLAG(tmp, FLAG_ALIVE))
            flags |= P_IS_ALIVE;
        if (QUERY_FLAG(tmp, FLAG_NO_MAGIC))
            flags |= P_NO_MAGIC;
        if (QUERY_FLAG(tmp, FLAG_DAMNED))
            flags |= P_NO_CLERIC;

        if (QUERY_FLAG(tmp, FLAG_BLOCKSVIEW))
            flags |= P_BLOCKSVIEW;
    } /* for stack of objects */

    if (player)
        flags |= P_PLAYER;

    /* we don't want to rely on this function to have accurate flags, but
     * since we're already doing the work, we calculate them here.
     * if they don't match, logic is broken someplace.
     */
    if (((oldflags&~(P_NEED_UPDATE|P_NO_ERROR)) != flags)
    && (!(oldflags&P_NO_ERROR))) {
        LOG(llevDebug, "update_position: updated flags do not match old flags: %s (old=%d,new=%d) %x != %x\n",
            m->path, x, y, (oldflags&~P_NEED_UPDATE), flags);
    }

    SET_MAP_FLAGS(m, x, y, flags);
    SET_MAP_MOVE_BLOCK(m, x, y, move_block&~move_allow);
    SET_MAP_MOVE_ON(m, x, y, move_on);
    SET_MAP_MOVE_OFF(m, x, y, move_off);
    SET_MAP_MOVE_SLOW(m, x, y, move_slow);
    SET_MAP_LIGHT(m, x, y, light);

    /* Note that player may be NULL here, which is fine - if no player, need
     * to clear any value that may be set.
     */
    SET_MAP_PLAYER(m, x, y, player);

    /* Note it is intentional we copy everything, including NULL values. */
    memcpy(GET_MAP_FACE_OBJS(m, x, y), layers, sizeof(object *)*MAP_LAYERS);
}

void set_map_reset_time(mapstruct *map) {
    int timeout;

    timeout = MAP_RESET_TIMEOUT(map);
    if (timeout <= 0)
        timeout = MAP_DEFAULTRESET;
    if (timeout >= MAP_MAXRESET)
        timeout = MAP_MAXRESET;
    MAP_WHEN_RESET(map) = seconds()+timeout;
}

static mapstruct *load_and_link_tiled_map(mapstruct *orig_map, int tile_num) {
    int dest_tile = (tile_num+2)%4;
    char path[HUGE_BUF];

    path_combine_and_normalize(orig_map->path, orig_map->tile_path[tile_num], path, sizeof(path));

    orig_map->tile_map[tile_num] = ready_map_name(path, 0);

    /* need to do a strcmp here as the orig_map->path is not a shared string */
    if (orig_map->tile_map[tile_num]->tile_path[dest_tile]
    && !strcmp(orig_map->tile_map[tile_num]->tile_path[dest_tile], orig_map->path))
        orig_map->tile_map[tile_num]->tile_map[dest_tile] = orig_map;

    return orig_map->tile_map[tile_num];
}

int out_of_map(mapstruct *m, int x, int y) {
    /* If we get passed a null map, this is obviously the
     * case.  This generally shouldn't happen, but if the
     * map loads fail below, it could happen.
     */
    if (!m)
        return 0;

    /* Simple case - coordinates are within this local
     * map.
     */
    if (x >= 0 && x < MAP_WIDTH(m) && y >= 0 && y < MAP_HEIGHT(m))
        return 0;

    if (x < 0) {
        if (!m->tile_path[3])
            return 1;
        if (!m->tile_map[3] || m->tile_map[3]->in_memory != MAP_IN_MEMORY) {
            load_and_link_tiled_map(m, 3);
        }
        return (out_of_map(m->tile_map[3], x+MAP_WIDTH(m->tile_map[3]), y));
    }
    if (x >= MAP_WIDTH(m)) {
        if (!m->tile_path[1])
            return 1;
        if (!m->tile_map[1] || m->tile_map[1]->in_memory != MAP_IN_MEMORY) {
            load_and_link_tiled_map(m, 1);
        }
        return (out_of_map(m->tile_map[1], x-MAP_WIDTH(m), y));
    }
    if (y < 0) {
        if (!m->tile_path[0])
            return 1;
        if (!m->tile_map[0] || m->tile_map[0]->in_memory != MAP_IN_MEMORY) {
            load_and_link_tiled_map(m, 0);
        }
        return (out_of_map(m->tile_map[0], x, y+MAP_HEIGHT(m->tile_map[0])));
    }
    if (y >= MAP_HEIGHT(m)) {
        if (!m->tile_path[2])
            return 1;
        if (!m->tile_map[2] || m->tile_map[2]->in_memory != MAP_IN_MEMORY) {
            load_and_link_tiled_map(m, 2);
        }
        return (out_of_map(m->tile_map[2], x, y-MAP_HEIGHT(m)));
    }
    return 1;
}

mapstruct *get_map_from_coord(mapstruct *m, sint16 *x, sint16 *y) {

    /* Simple case - coordinates are within this local
     * map.
     */

    if (*x >= 0 && *x < MAP_WIDTH(m) && *y >= 0 && *y < MAP_HEIGHT(m))
        return m;

    if (*x < 0) {
        if (!m->tile_path[3])
            return NULL;
        if (!m->tile_map[3] || m->tile_map[3]->in_memory != MAP_IN_MEMORY)
            load_and_link_tiled_map(m, 3);

        *x += MAP_WIDTH(m->tile_map[3]);
        return (get_map_from_coord(m->tile_map[3], x, y));
    }
    if (*x >= MAP_WIDTH(m)) {
        if (!m->tile_path[1])
            return NULL;
        if (!m->tile_map[1] || m->tile_map[1]->in_memory != MAP_IN_MEMORY)
            load_and_link_tiled_map(m, 1);

        *x -= MAP_WIDTH(m);
        return (get_map_from_coord(m->tile_map[1], x, y));
    }
    if (*y < 0) {
        if (!m->tile_path[0])
            return NULL;
        if (!m->tile_map[0] || m->tile_map[0]->in_memory != MAP_IN_MEMORY)
            load_and_link_tiled_map(m, 0);

        *y += MAP_HEIGHT(m->tile_map[0]);
        return (get_map_from_coord(m->tile_map[0], x, y));
    }
    if (*y >= MAP_HEIGHT(m)) {
        if (!m->tile_path[2])
            return NULL;
        if (!m->tile_map[2] || m->tile_map[2]->in_memory != MAP_IN_MEMORY)
            load_and_link_tiled_map(m, 2);

        *y -= MAP_HEIGHT(m);
        return (get_map_from_coord(m->tile_map[2], x, y));
    }
    return NULL;    /* Shouldn't get here */
}

static int adjacent_map(const mapstruct *map1, const mapstruct *map2, int *dx, int *dy) {
    if (!map1 || !map2)
        return 0;

    if (map1 == map2) {
        *dx = 0;
        *dy = 0;
    } else if (map1->tile_map[0] == map2) { /* up */
        *dx = 0;
        *dy = -MAP_HEIGHT(map2);
    } else if (map1->tile_map[1] == map2) { /* right */
        *dx = MAP_WIDTH(map1);
        *dy = 0;
    } else if (map1->tile_map[2] == map2) { /* down */
        *dx = 0;
        *dy = MAP_HEIGHT(map1);
    } else if (map1->tile_map[3] == map2) { /* left */
        *dx = -MAP_WIDTH(map2);
        *dy = 0;
    } else if (map1->tile_map[0] && map1->tile_map[0]->tile_map[1] == map2) { /* up right */
        *dx = MAP_WIDTH(map1->tile_map[0]);
        *dy = -MAP_HEIGHT(map1->tile_map[0]);
    } else if (map1->tile_map[0] && map1->tile_map[0]->tile_map[3] == map2) { /* up left */
        *dx = -MAP_WIDTH(map2);
        *dy = -MAP_HEIGHT(map1->tile_map[0]);
    } else if (map1->tile_map[1] && map1->tile_map[1]->tile_map[0] == map2) { /* right up */
        *dx = MAP_WIDTH(map1);
        *dy = -MAP_HEIGHT(map2);
    } else if (map1->tile_map[1] && map1->tile_map[1]->tile_map[2] == map2) { /* right down */
        *dx = MAP_WIDTH(map1);
        *dy = MAP_HEIGHT(map1->tile_map[1]);
    } else if (map1->tile_map[2] && map1->tile_map[2]->tile_map[1] == map2) { /* down right */
        *dx = MAP_WIDTH(map1->tile_map[2]);
        *dy = MAP_HEIGHT(map1);
    } else if (map1->tile_map[2] && map1->tile_map[2]->tile_map[3] == map2) { /* down left */
        *dx = -MAP_WIDTH(map2);
        *dy = MAP_HEIGHT(map1);
    } else if (map1->tile_map[3] && map1->tile_map[3]->tile_map[0] == map2) { /* left up */
        *dx = -MAP_WIDTH(map1->tile_map[3]);
        *dy = -MAP_HEIGHT(map2);
    } else if (map1->tile_map[3] && map1->tile_map[3]->tile_map[2] == map2) { /* left down */
        *dx = -MAP_WIDTH(map1->tile_map[3]);
        *dy = MAP_HEIGHT(map1->tile_map[3]);
    } else { /* not "adjacent" enough */
        return 0;
    }

    return 1;
}

void get_rangevector(object *op1, const object *op2, rv_vector *retval, int flags) {
    if (!adjacent_map(op1->map, op2->map, &retval->distance_x, &retval->distance_y)) {
        /* be conservative and fill in _some_ data */
        retval->distance = 100000;
        retval->distance_x = 32767;
        retval->distance_y = 32767;
        retval->direction = 0;
        retval->part = NULL;
    } else {
        object *best;

        retval->distance_x += op2->x-op1->x;
        retval->distance_y += op2->y-op1->y;

        best = op1;
        /* If this is multipart, find the closest part now */
        if (!(flags&0x1) && op1->more) {
            object *tmp;
            int best_distance = retval->distance_x*retval->distance_x+
                                retval->distance_y*retval->distance_y, tmpi;

            /* we just take the offset of the piece to head to figure
             * distance instead of doing all that work above again
             * since the distance fields we set above are positive in the
             * same axis as is used for multipart objects, the simply arithmetic
             * below works.
             */
            for (tmp = op1->more; tmp != NULL; tmp = tmp->more) {
                tmpi = (op1->x-tmp->x+retval->distance_x)*(op1->x-tmp->x+retval->distance_x)+
                       (op1->y-tmp->y+retval->distance_y)*(op1->y-tmp->y+retval->distance_y);
                if (tmpi < best_distance) {
                    best_distance = tmpi;
                    best = tmp;
                }
            }
            if (best != op1) {
                retval->distance_x += op1->x-best->x;
                retval->distance_y += op1->y-best->y;
            }
        }
        retval->part = best;
        retval->distance = isqrt(retval->distance_x*retval->distance_x+retval->distance_y*retval->distance_y);
        retval->direction = find_dir_2(-retval->distance_x, -retval->distance_y);
    }
}

void get_rangevector_from_mapcoord(const mapstruct *m, int x, int y, const object *op2, rv_vector *retval, int flags) {
    if (!adjacent_map(m, op2->map, &retval->distance_x, &retval->distance_y)) {
        /* be conservative and fill in _some_ data */
        retval->distance = 100000;
        retval->distance_x = 32767;
        retval->distance_y = 32767;
        retval->direction = 0;
        retval->part = NULL;
    } else {
        retval->distance_x += op2->x-x;
        retval->distance_y += op2->y-y;

        retval->part = NULL;
        retval->distance = isqrt(retval->distance_x*retval->distance_x+retval->distance_y*retval->distance_y);
        retval->direction = find_dir_2(-retval->distance_x, -retval->distance_y);
    }
}

int on_same_map(const object *op1, const object *op2) {
    int dx, dy;

    return adjacent_map(op1->map, op2->map, &dx, &dy);
}

void map_remove_unique_files(const mapstruct *map) {
    char base[HUGE_BUF], path[HUGE_BUF];
    int count;

    if (map->unique) {
        /* Unique maps have their full path already set. */
        unlink(map->path);
        return;
    }

    create_items_path(map->path, base, sizeof(base));

    for (count = 0; count < 10; count++) {
        snprintf(path, sizeof(path), "%s.v%02d", base, count);
        unlink(path);
    }
}