server/common/map.C

/*
 * CrossFire, A Multiplayer game
 * 
 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
 * Copyright (C) 2001-2003 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@schmorp.de>
 */

#include <unistd.h>

#include "global.h"
#include "funcpoint.h"

#include "loader.h"

#include "path.h"

/*
 * This makes a path absolute outside the world of Crossfire.
 * In other words, it prepends LIBDIR/MAPDIR/ to the given path
 * and returns the pointer to a static array containing the result.
 * it really should be called create_mapname
 */
const char *
create_pathname (const char *name)
{
  static char buf[8192];
  snprintf (buf, sizeof (buf), "%s/%s/%s", settings.datadir, settings.mapdir, name);
  return buf;
}

/*
 * This function checks if a file with the given path exists.
 * -1 is returned if it fails, otherwise the mode of the file
 * is returned.
 * It tries out all the compression suffixes listed in the uncomp[] array.
 *
 * If prepend_dir is set, then we call create_pathname (which prepends
 * libdir & mapdir).  Otherwise, we assume the name given is fully
 * complete.
 * Only the editor actually cares about the writablity of this -
 * the rest of the code only cares that the file is readable.
 * when the editor goes away, the call to stat should probably be
 * replaced by an access instead (similar to the windows one, but
 * that seems to be missing the prepend_dir processing
 */
int
check_path (const char *name, int prepend_dir)
{
  char buf[MAX_BUF];

  char *endbuf;
  struct stat statbuf;
  int mode = 0;

  if (prepend_dir)
    assign (buf, create_pathname (name));
  else
    assign (buf, name);

  /* 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);

  if (stat (buf, &statbuf))
    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);
}

/* This rolls up wall, blocks_magic, blocks_view, etc, all into
 * one function that just returns a P_.. value (see map.h)
 * it will also do map translation for tiled maps, returning
 * new values into newmap, nx, and ny.  Any and all of those
 * values can be null, in which case if a new map is needed (returned
 * by a P_NEW_MAP value, another call to get_map_from_coord
 * is needed.  The case of not passing values is if we're just
 * checking for the existence of something on those spaces, but
 * don't expect to insert/remove anything from those spaces.
 */
int
get_map_flags (maptile *oldmap, maptile **newmap, sint16 x, sint16 y, sint16 *nx, sint16 *ny)
{
  sint16 newx = x;
  sint16 newy = y;

  maptile *mp = get_map_from_coord (oldmap, &newx, &newy);

  if (!mp)
    return P_OUT_OF_MAP;

  if (newmap) *newmap = mp;
  if (nx)     *nx     = newx;
  if (ny)     *ny     = newy;

  return mp->at (newx, newy).flags () | (mp != oldmap ? P_NEW_MAP : 0);
}

/*
 * Returns true if the given coordinate is blocked except by the
 * object passed is not blocking.  This is used with 
 * multipart monsters - if we want to see if a 2x2 monster
 * can move 1 space to the left, we don't want its own area
 * to block it from moving there.
 * Returns TRUE if the space is blocked by something other than the
 * monster.
 * m, x, y are the target map/coordinates - needed for map tiling.
 * the coordinates & map passed in should have been updated for tiling
 * by the caller.
 */
int
blocked_link (object *ob, maptile *m, int sx, int sy)
{
  object *tmp;
  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;
    }

  /* Save some cycles - instead of calling get_map_flags(), just get the value
   * directly.
   */
  mflags = m->at (sx, 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;

  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; tmp = tmp->above)
    {

      /* This must be before the checks below.  Code for inventory checkers. */
      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)
                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)        /* player has object */
                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
              && !tmp->flag [FLAG_WIZ]
              && tmp->contr->hidden)
            return 1;
        }

    }
  return 0;
}

/*
 * Returns true if the given object can't fit in the given spot.
 * This is meant for multi space objects - for single space objecs,
 * just calling get_map_blocked and checking that against movement type
 * of object. This function goes through all the parts of the
 * multipart object and makes sure they can be inserted.
 *
 * While this doesn't call out of map, the get_map_flags does.
 *
 * This function has been used to deprecate arch_out_of_map -
 * this function also does that check, and since in most cases,
 * a call to one would follow the other, doesn't make a lot of sense to
 * have two seperate functions for this.
 *
 * This returns nonzero if this arch can not go on the space provided,
 * 0 otherwise.  the return value will contain the P_.. value
 * so the caller can know why this object can't go on the map.
 * Note that callers should not expect P_NEW_MAP to be set
 * in return codes - since the object is multispace - if
 * we did return values, what do you return if half the object
 * is one map, half on another.
 *
 * Note this used to be arch_blocked, but with new movement
 * code, we need to have actual object to check its move_type
 * against the move_block values.
 */
int
ob_blocked (const object *ob, maptile *m, sint16 x, sint16 y)
{
  archetype *tmp;
  int flag;
  maptile *m1;
  sint16 sx, sy;

  if (!ob)
    {
      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 m1->at (sx, sy).move_block;
    }

  for (tmp = ob->arch; tmp; tmp = tmp->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;

      mapspace &ms = m1->at (sx, sy);

      /* 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 && ms.move_block != MOVE_ALL)
        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, ms.move_block))
        return P_NO_PASS;
    }

  return 0;
}

/* When the map is loaded, load_object does not actually insert objects
 * into inventory, but just links them.  What this does is go through
 * and insert them properly.
 * The object 'container' is the object that contains the inventory.
 * This is needed so that we can update the containers weight.
 */
void
fix_container (object *container)
{
  object *tmp = container->inv, *next;

  container->inv = 0;
  while (tmp)
    {
      next = tmp->below;
      if (tmp->inv)
        fix_container (tmp);

      insert_ob_in_ob (tmp, container);
      tmp = next;
    }

  /* sum_weight will go through and calculate what all the containers are
   * carrying.
   */
  sum_weight (container);
}

void
maptile::set_object_flag (int flag, int value)
{
  if (!spaces)
    return;

  for (mapspace *ms = spaces + size (); ms-- > spaces; )
    for (object *tmp = ms->bot; tmp; tmp = tmp->above)
      tmp->flag [flag] = value;
}

/* link_multipart_objects go through all the objects on the map looking
 * for objects whose arch says they are multipart yet according to the
 * info we have, they only have the head (as would be expected when
 * they are saved).
 */
void
maptile::link_multipart_objects ()
{
  if (!spaces)
    return;

  for (mapspace *ms = spaces + size (); ms-- > spaces; )
    for (object *op = ms->bot; op; op = op->above)
      {
        /* already multipart - don't do anything more */
        if (op->head_ () == op && !op->more && op->arch->more)
          {
            op->remove ();
            op->expand_tail ();
            insert (op, op->x, op->y, 0, INS_NO_MERGE | INS_ABOVE_FLOOR_ONLY | INS_NO_WALK_ON);
          }
      }
}

/*
 * Loads (ands parses) the objects into a given map from the specified
 * file pointer.
 */
bool
maptile::_load_objects (object_thawer &f)
{
  for (;;)
    {
      coroapi::cede_to_tick_every (100); // cede once in a while

      switch (f.kw)
        {
          case KW_arch:
            if (object *op = object::read (f, this))
              {
                if (op->inv)
                  sum_weight (op);

                insert_ob_in_map (op, this, op, INS_NO_MERGE | INS_NO_WALK_ON | INS_ON_TOP | INS_MAP_LOAD);
              }

            continue;

          case KW_EOF:
            return true;

          default:
            if (!f.parse_error ("map file"))
              return false;
            break;
        }

        f.next ();
    }

  return true;
}

void
maptile::activate ()
{
  active = true;

  if (spaces)
    for (mapspace *ms = spaces + size (); ms-- > spaces; )
      for (object *op = ms->bot; op; op = op->above)
        op->activate_recursive ();
}

void
maptile::deactivate ()
{
  active = false;

  if (spaces)
    for (mapspace *ms = spaces + size (); ms-- > spaces; )
      for (object *op = ms->bot; op; op = op->above)
        op->deactivate_recursive ();
}

bool
maptile::_save_objects (object_freezer &f, int flags)
{
  coroapi::cede_to_tick ();

  if (flags & IO_HEADER)
    _save_header (f);

  if (!spaces)
    return false;

  for (int i = 0; i < size (); ++i)
    {
      int unique = 0;
      for (object *op = spaces [i].bot; op; op = op->above)
        {
          if (op->flag [FLAG_UNIQUE] && op->flag [FLAG_IS_FLOOR])
            unique = 1;

          if (!op->can_map_save ())
            continue;

          if (unique || op->flag [FLAG_UNIQUE])
            {
              if (flags & IO_UNIQUES)
                op->write (f);
            }
          else if (flags & IO_OBJECTS)
            op->write (f);
        }
    }

  coroapi::cede_to_tick ();

  return true;
}

bool
maptile::_load_objects (const char *path, bool skip_header)
{
  object_thawer f (path);

  if (!f)
    return false;

  f.next ();

  if (skip_header)
    for (;;)
      {
        keyword kw = f.kw;
        f.skip ();
        if (kw == KW_end)
          break;
      }

  return _load_objects (f);
}

bool
maptile::_save_objects (const char *path, int flags)
{
  object_freezer freezer;

  if (!_save_objects (freezer, flags))
    return false;

  return freezer.save (path);
}

maptile::maptile ()
{
  in_memory = MAP_SWAPPED;

  /* The maps used to pick up default x and y values from the
   * map archetype. Mimic that behaviour.
   */
  width      = 16;
  height     = 16;
  timeout    = 300;
  max_nrof   = 1000;    // 1000 items of anything
  max_volume = 2000000; // 2m³
}

maptile::maptile (int w, int h)
{
  in_memory = MAP_SWAPPED;

  width         = w;
  height        = h;
  reset_timeout = 0;
  timeout       = 300;
  enter_x       = 0;
  enter_y       = 0;

  alloc ();
}

/*
 * Allocates the arrays contained in a maptile.
 * This basically allocates the dynamic array of spaces for the
 * map.
 */
void
maptile::alloc ()
{
  if (spaces)
    return;

  spaces = salloc0<mapspace> (size ());
}

/* Takes a string from a map definition and outputs a pointer to the array of shopitems 
 * corresponding to that string. Memory is allocated for this, it must be freed 
 * at a later date.
 * Called by parse_map_headers below.
 */
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 (input_string);
  p = shop_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 = new 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;
}

/* opposite of parse string, this puts the string that was originally fed in to
 * the map (or something equivilent) into output_string. */
static void
print_shop_string (maptile *m, char *output_string)
{
  int i;
  char tmp[MAX_BUF];

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

      strcat (output_string, tmp);
    }
}

/* This loads the header information of the map.  The header
 * contains things like difficulty, size, timeout, etc.
 * this used to be stored in the map object, but with the
 * addition of tiling, fields beyond that easily named in an
 * object structure were needed, so it just made sense to
 * put all the stuff in the map object so that names actually make
 * sense.
 * This could be done in lex (like the object loader), but I think
 * currently, there are few enough fields this is not a big deal.
 * MSW 2001-07-01
 */
bool
maptile::_load_header (object_thawer &thawer)
{
  for (;;)
    {
      keyword kw = thawer.get_kv ();

      switch (kw)
        {
          case KW_msg:
            thawer.get_ml (KW_endmsg, msg);
            break;

          case KW_lore: // CF+ extension
            thawer.get_ml (KW_endlore, maplore);
            break;

          case KW_maplore:
            thawer.get_ml (KW_endmaplore, maplore);
            break;

          case KW_arch:
            if (strcmp (thawer.get_str (), "map"))
              LOG (llevError, "%s: loading map and got a non 'arch map' line (arch %s), skipping.\n", &path, thawer.get_str ());
            break;

          case KW_oid:
            thawer.get (this, thawer.get_sint32 ());
            break;

          case KW_file_format_version: break; // nop

          case KW_name:       thawer.get (name);       break;
          case KW_attach:     thawer.get (attach);     break;
          case KW_reset_time: thawer.get (reset_time); break;
          case KW_shopgreed:  thawer.get (shopgreed);  break;
          case KW_shopmin:    thawer.get (shopmin);    break;
          case KW_shopmax:    thawer.get (shopmax);    break;
          case KW_shoprace:   thawer.get (shoprace);   break;
          case KW_outdoor:    thawer.get (outdoor);    break;
          case KW_temp:       thawer.get (temp);       break;
          case KW_pressure:   thawer.get (pressure);   break;
          case KW_humid:      thawer.get (humid);      break;
          case KW_windspeed:  thawer.get (windspeed);  break;
          case KW_winddir:    thawer.get (winddir);    break;
          case KW_sky:        thawer.get (sky);        break;

          case KW_per_player: thawer.get (per_player); break;
          case KW_per_party:  thawer.get (per_party);  break;
                              
          case KW_region:     default_region = region::find (thawer.get_str ()); break;
          case KW_shopitems:  shopitems = parse_shop_string (thawer.get_str ()); break;

          //   old names            new names
          case KW_hp:          case KW_enter_x:         thawer.get (enter_x);  break;
          case KW_sp:          case KW_enter_y:         thawer.get (enter_y);  break;
          case KW_x:           case KW_width:           thawer.get (width);    break;
          case KW_y:           case KW_height:          thawer.get (height);   break;
          case KW_weight:      case KW_reset_timeout:   thawer.get (reset_timeout);   break;
          case KW_value:       case KW_swap_time:       thawer.get (timeout);  break;
          case KW_level:       case KW_difficulty:      thawer.get (difficulty); difficulty = clamp (difficulty, 1, settings.max_level); break;
          case KW_invisible:   case KW_darkness:        thawer.get (darkness); break;
          case KW_stand_still: case KW_fixed_resettime: thawer.get (fixed_resettime); break;

          case KW_tile_path_1: thawer.get (tile_path [0]); break;
          case KW_tile_path_2: thawer.get (tile_path [1]); break;
          case KW_tile_path_3: thawer.get (tile_path [2]); break;
          case KW_tile_path_4: thawer.get (tile_path [3]); break;

          case KW_end:
            return true;

          default:
            if (!thawer.parse_error ("map", 0))
              return false;
            break;
        }
    }

  abort ();
}

bool
maptile::_load_header (const char *path)
{
  object_thawer thawer (path);

  if (!thawer)
    return false;

  return _load_header (thawer);
}

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

/* This goes through the maptile and removed any unique items on the map. */
void
maptile::clear_unique_items ()
{
  for (int i = 0; i < size (); ++i)
    {
      int unique = 0;
      for (object *op = spaces [i].bot; op; )
        {
          object *above = op->above;

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

          if (op->head_ () == op && (QUERY_FLAG (op, FLAG_UNIQUE) || unique))
            {
              op->destroy_inv (false);
              op->destroy ();
            }

          op = above;
        }
    }
}

bool
maptile::_save_header (object_freezer &freezer)
{
#define MAP_OUT(k)    freezer.put (KW_ ## k, k)
#define MAP_OUT2(k,v) freezer.put (KW_ ## k, v)

  MAP_OUT2 (arch, "map");

  if (name) MAP_OUT (name);
  MAP_OUT (swap_time);
  MAP_OUT (reset_time);
  MAP_OUT (reset_timeout);
  MAP_OUT (fixed_resettime);
  MAP_OUT (difficulty);

  if (default_region) MAP_OUT2 (region, default_region->name);

  if (shopitems)
    {
      char shop[MAX_BUF];
      print_shop_string (this, shop);
      MAP_OUT2 (shopitems, shop);
    }

  MAP_OUT (shopgreed);
  MAP_OUT (shopmin);
  MAP_OUT (shopmax);
  if (shoprace) MAP_OUT (shoprace);
  MAP_OUT (darkness);
  MAP_OUT (width);
  MAP_OUT (height);
  MAP_OUT (enter_x);
  MAP_OUT (enter_y);

  if (msg)     freezer.put (KW_msg    , KW_endmsg    , msg);
  if (maplore) freezer.put (KW_maplore, KW_endmaplore, maplore);

  MAP_OUT (outdoor);
  MAP_OUT (temp);
  MAP_OUT (pressure);
  MAP_OUT (humid);
  MAP_OUT (windspeed);
  MAP_OUT (winddir);
  MAP_OUT (sky);

  MAP_OUT (per_player);
  MAP_OUT (per_party);

  if (tile_path [0]) MAP_OUT2 (tile_path_1, tile_path [0]);
  if (tile_path [1]) MAP_OUT2 (tile_path_2, tile_path [1]);
  if (tile_path [2]) MAP_OUT2 (tile_path_3, tile_path [2]);
  if (tile_path [3]) MAP_OUT2 (tile_path_4, tile_path [3]);

  freezer.put (this);
  freezer.put (KW_end);

  return true;
}

bool
maptile::_save_header (const char *path)
{
  object_freezer freezer;

  if (!_save_header (freezer))
    return false;

  return freezer.save (path);
}

/*
 * Remove and free all objects in the given map.
 */
void
maptile::clear ()
{
  sfree (regions, size ()), regions = 0;
  free (regionmap), regionmap = 0;

  if (spaces)
    {
      for (mapspace *ms = spaces + size (); ms-- > spaces; )
        while (object *op = ms->bot->head_ ())
          {
            op->destroy_inv (false);
            op->destroy ();
          }

      sfree (spaces, size ()), spaces = 0;
    }

  if (buttons)
    free_objectlinkpt (buttons), buttons = 0;
}

void
maptile::clear_header ()
{
  name     = 0;
  msg      = 0;
  maplore  = 0;
  shoprace = 0;
  delete [] shopitems, shopitems = 0;

  for (int i = 0; i < 4; i++)
    tile_path [i] = 0;
}

maptile::~maptile ()
{
  assert (destroyed ());
}

void
maptile::clear_links_to (maptile *m)
{
  /* 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 asymetric, we just can not look to see which
   * maps this map tiles with and clears those.
   */
  for (int i = 0; i < 4; i++)
    if (tile_map[i] == m)
      tile_map[i] = 0;
}

void
maptile::do_destroy ()
{
  attachable::do_destroy ();

  clear ();
}

/*
 * Updates every button on the map (by calling update_button() for them).
 */
void
maptile::update_buttons ()
{
  for (oblinkpt *obp = buttons; obp; obp = obp->next)
    for (objectlink *ol = obp->link; ol; ol = ol->next)
      {
        if (!ol->ob)
          {
            LOG (llevError, "Internal error in update_button (%s (%dx%d), connected %ld).\n",
                 ol->ob ? (const char *) ol->ob->name : "null", ol->ob ? ol->ob->x : -1, ol->ob ? ol->ob->y : -1, obp->value);
            continue;
          }

        if (ol->ob->type == BUTTON || ol->ob->type == PEDESTAL)
          {
            update_button (ol->ob);
            break;
          }
      }
}

/*
 * This routine is supposed to find out the difficulty of the map.
 * difficulty does not have a lot to do with character level,
 * but does have a lot to do with treasure on the map.
 *
 * Difficulty can now be set by the map creature.  If the value stored
 * in the map is zero, then use this routine.  Maps should really
 * have a difficulty set than using this function - human calculation
 * is much better than this functions guesswork.
 */
int
maptile::estimate_difficulty () const
{
  long monster_cnt = 0;
  double avgexp = 0;
  sint64 total_exp = 0;

  for (mapspace *ms = spaces + size (); ms-- > spaces; )
    for (object *op = ms->bot; op; op = op->above)
      {
        if (QUERY_FLAG (op, FLAG_MONSTER))
          {
            total_exp += op->stats.exp;
            monster_cnt++;
          }

        if (QUERY_FLAG (op, FLAG_GENERATOR))
          {
            total_exp += op->stats.exp;

            if (archetype *at = type_to_archetype (GENERATE_TYPE (op)))
              total_exp += at->clone.stats.exp * 8;

            monster_cnt++;
          }
      }

  avgexp = (double) total_exp / monster_cnt;

  for (int i = 1; i <= settings.max_level; i++)
    if ((level_exp (i, 1) - level_exp (i - 1, 1)) > (100 * avgexp))
      return i;

  return 1;
}

/* change_map_light() - used to change map light level (darkness)
 * up or down. Returns true if successful.   It should now be
 * possible to change a value by more than 1.
 * Move this from los.c to map.c since this is more related
 * to maps than los.
 * postive values make it darker, negative make it brighter
 */
int
maptile::change_map_light (int change)
{
  int new_level = darkness + change;

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

  /* inform all players on the map */
  if (change > 0)
    new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes darker.");
  else
    new_info_map (NDI_BLACK | NDI_UNIQUE, this, "It becomes brighter.");

  /* Do extra checking.  since 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)
    darkness = 0;
  else if (new_level >= MAX_DARKNESS)
    darkness = MAX_DARKNESS;
  else
    darkness = new_level;

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

/* 
 * This function updates various attributes about a specific space
 * on the map (what it looks like, whether it blocks magic,
 * has a living creatures, prevents people from passing
 * through, etc)
 */
void
mapspace::update_ ()
{
  object *tmp, *last = 0;
  uint8 flags = P_UPTODATE, light = 0, anywhere = 0;
  MoveType move_block = 0, move_slow = 0, move_on = 0, move_off = 0, move_allow = 0;

  //object *middle = 0;
  //object *top    = 0;
  //object *floor  = 0;
  // this seems to generate better code than using locals, above
  object *&top    = faces_obj[0] = 0;
  object *&middle = faces_obj[1] = 0;
  object *&floor  = faces_obj[2] = 0;

  for (tmp = bot; tmp; last = tmp, tmp = tmp->above)
    {
      /* 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 dissapation factor that is cubed.
       */
      if (tmp->glow_radius > light)
        light = tmp->glow_radius;

      /* This call is needed in order to update objects the player
       * is standing in that have animations (ie, grass, fire, etc).
       * However, it also causes the look window to be re-drawn
       * 3 times each time the player moves, because many of the
       * functions the move_player calls eventualy call this.
       *
       * Always put the player down for drawing.
       */
      if (!tmp->invisible)
        {
          if ((tmp->type == PLAYER || QUERY_FLAG (tmp, FLAG_MONSTER)))
            top = tmp;
          else if (QUERY_FLAG (tmp, FLAG_IS_FLOOR))
            {
              /* If we got a floor, that means middle and top were below it,
               * so should not be visible, so we clear them.
               */
              middle = 0;
              top    = 0;
              floor  = tmp;
            }
          /* Flag anywhere have high priority */
          else if (QUERY_FLAG (tmp, FLAG_SEE_ANYWHERE))
            {
              middle = tmp;
              anywhere = 1;
            }
          /* Find the highest visible face around.  If equal
           * visibilities, we still want the one nearer to the
           * top
           */
          else if (!middle || (::faces [tmp->face].visibility > ::faces [middle->face].visibility && !anywhere))
            middle = tmp;
        }

      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_BLOCKSVIEW)) flags |= P_BLOCKSVIEW;
      if (QUERY_FLAG (tmp, FLAG_NO_MAGIC))   flags |= P_NO_MAGIC;
      if (tmp->type == PLAYER)               flags |= P_PLAYER;
      if (tmp->type == SAFE_GROUND)          flags |= P_SAFE;
      if (QUERY_FLAG (tmp, FLAG_ALIVE))      flags |= P_IS_ALIVE;
      if (QUERY_FLAG (tmp, FLAG_DAMNED))     flags |= P_NO_CLERIC;
    }

  this->light      = light;
  this->flags_     = flags;
  this->move_block = move_block & ~move_allow;
  this->move_on    = move_on;
  this->move_off   = move_off;
  this->move_slow  = move_slow;

  /* At this point, we have a floor face (if there is a floor),
   * and the floor is set - we are not going to touch it at
   * this point.
   * middle contains the highest visibility face. 
   * top contains a player/monster face, if there is one.
   *
   * We now need to fill in top.face and/or middle.face.
   */

  /* If the top face also happens to be high visibility, re-do our
   * middle face.  This should not happen, as we already have the
   * else statement above so middle should not get set.  OTOH, it 
   * may be possible for the faces to match but be different objects.
   */
  if (top == middle)
    middle = 0;

  /* There are three posibilities at this point:
   * 1) top face is set, need middle to be set.
   * 2) middle is set, need to set top.
   * 3) neither middle or top is set - need to set both.
   */

  for (tmp = last; tmp; tmp = tmp->below)
    {
      /* Once we get to a floor, stop, since we already have a floor object */
      if (QUERY_FLAG (tmp, FLAG_IS_FLOOR))
        break;

      /* If two top faces are already set, quit processing */
      if (top && middle)
        break;

      /* Only show visible faces */
      if (!tmp->invisible)
        {
          /* Fill in top if needed */
          if (!top)
            {
              top = tmp;
              if (top == middle)
                middle = 0;
            }
          else
            {
              /* top is already set - we should only get here if
               * middle is not set
               *
               * Set the middle face and break out, since there is nothing
               * more to fill in.  We don't check visiblity here, since
               * 
               */
              if (tmp != top)
                {
                  middle = tmp;
                  break;
                }
            }
        }
    }

  if (middle == floor)
    middle = 0;

  if (top == middle)
    middle = 0;

#if 0
  faces_obj [0] = top;
  faces_obj [1] = middle;
  faces_obj [2] = floor;
#endif
}

uint64
mapspace::volume () const
{
  uint64 vol = 0;

  for (object *op = top; op && !op->flag [FLAG_NO_PICK]; op = op->below)
    vol += op->volume ();

  return vol;
}

/* this updates the orig_map->tile_map[tile_num] value after finding
 * the map.  It also takes care of linking back the freshly found
 * maps tile_map values if it tiles back to this one.  It returns
 * the value of orig_map->tile_map[tile_num].
 */
static inline maptile *
find_and_link (maptile *orig_map, int tile_num)
{
  maptile *mp = orig_map->tile_map [tile_num];

  if (!mp)
    {
      mp = orig_map->find_sync (orig_map->tile_path [tile_num], orig_map);

      if (!mp)
        {
          // emergency mode, manufacture a dummy map, this creates a memleak, but thats fine
          LOG (llevError, "FATAL: cannot load tiled map %s from %s, leaking memory and worse!\n",
               &orig_map->tile_path[tile_num], &orig_map->path);
          mp = new maptile (1, 1);
          mp->alloc ();
          mp->in_memory = MAP_IN_MEMORY;
        }
    }

  int dest_tile = (tile_num + 2) % 4;

  orig_map->tile_map [tile_num] = mp;

  // optimisation: back-link map to origin map if euclidean
  //TODO: non-euclidean maps MUST GO
  if (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 mp;
}

static inline void
load_and_link (maptile *orig_map, int tile_num)
{
  find_and_link (orig_map, tile_num)->load_sync ();
}

/* this returns TRUE if the coordinates (x,y) are out of
 * map m.  This function also takes into account any
 * tiling considerations, loading adjacant maps as needed.
 * This is the function should always be used when it
 * necessary to check for valid coordinates.
 * This function will recursively call itself for the 
 * tiled maps.
 */
int
out_of_map (maptile *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;

  if (x < 0)
    {
      if (!m->tile_path[3])
        return 1;

      if (!m->tile_map[3] || m->tile_map[3]->in_memory != MAP_IN_MEMORY)
        find_and_link (m, 3);

      return out_of_map (m->tile_map[3], x + m->tile_map[3]->width, y);
    }

  if (x >= m->width)
    {
      if (!m->tile_path[1])
        return 1;

      if (!m->tile_map[1] || m->tile_map[1]->in_memory != MAP_IN_MEMORY)
        find_and_link (m, 1);

      return out_of_map (m->tile_map[1], x - m->width, 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)
        find_and_link (m, 0);

      return out_of_map (m->tile_map[0], x, y + m->tile_map[0]->height);
    }

  if (y >= m->height)
    {
      if (!m->tile_path[2])
        return 1;

      if (!m->tile_map[2] || m->tile_map[2]->in_memory != MAP_IN_MEMORY)
        find_and_link (m, 2);

      return out_of_map (m->tile_map[2], x, y - m->height);
    }

  /* Simple case - coordinates are within this local
   * map.
   */
  return 0;
}

/* This is basically the same as out_of_map above, but
 * instead we return NULL if no map is valid (coordinates
 * out of bounds and no tiled map), otherwise it returns
 * the map as that the coordinates are really on, and 
 * updates x and y to be the localised coordinates.
 * Using this is more efficient of calling out_of_map
 * and then figuring out what the real map is
 */
maptile *
maptile::xy_find (sint16 &x, sint16 &y)
{
  if (x < 0)
    {
      if (!tile_path[3])
        return 0;

      find_and_link (this, 3);
      x += tile_map[3]->width;
      return tile_map[3]->xy_find (x, y);
    }

  if (x >= width)
    {
      if (!tile_path[1])
        return 0;

      find_and_link (this, 1);
      x -= width;
      return tile_map[1]->xy_find (x, y);
    }

  if (y < 0)
    {
      if (!tile_path[0])
        return 0;

      find_and_link (this, 0);
      y += tile_map[0]->height;
      return tile_map[0]->xy_find (x, y);
    }

  if (y >= height)
    {
      if (!tile_path[2])
        return 0;

      find_and_link (this, 2);
      y -= height;
      return tile_map[2]->xy_find (x, y);
    }

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

/**
 * Return whether map2 is adjacent to map1. If so, store the distance from
 * map1 to map2 in dx/dy.
 */
int
adjacent_map (const maptile *map1, const maptile *map2, int *dx, int *dy)
{
  if (!map1 || !map2)
    return 0;

  //TODO: this doesn't actually check corretcly when intermediate maps are not loaded
  //fix: compare paths instead (this is likely faster, too!)
  if (map1 == map2)
    {
      *dx = 0;
      *dy = 0;
    }
  else if (map1->tile_map[0] == map2)
    {                           /* up */
      *dx = 0;
      *dy = -map2->height;
    }
  else if (map1->tile_map[1] == map2)
    {                           /* right */
      *dx = map1->width;
      *dy = 0;
    }
  else if (map1->tile_map[2] == map2)
    {                           /* down */
      *dx = 0;
      *dy = map1->height;
    }
  else if (map1->tile_map[3] == map2)
    {                           /* left */
      *dx = -map2->width;
      *dy = 0;
    }
  else if (map1->tile_map[0] && map1->tile_map[0]->tile_map[1] == map2)
    {                           /* up right */
      *dx = map1->tile_map[0]->width;
      *dy = -map1->tile_map[0]->height;
    }
  else if (map1->tile_map[0] && map1->tile_map[0]->tile_map[3] == map2)
    {                           /* up left */
      *dx = -map2->width;
      *dy = -map1->tile_map[0]->height;
    }
  else if (map1->tile_map[1] && map1->tile_map[1]->tile_map[0] == map2)
    {                           /* right up */
      *dx = map1->width;
      *dy = -map2->height;
    }
  else if (map1->tile_map[1] && map1->tile_map[1]->tile_map[2] == map2)
    {                           /* right down */
      *dx = map1->width;
      *dy = map1->tile_map[1]->height;
    }
  else if (map1->tile_map[2] && map1->tile_map[2]->tile_map[1] == map2)
    {                           /* down right */
      *dx = map1->tile_map[2]->width;
      *dy = map1->height;
    }
  else if (map1->tile_map[2] && map1->tile_map[2]->tile_map[3] == map2)
    {                           /* down left */
      *dx = -map2->width;
      *dy = map1->height;
    }
  else if (map1->tile_map[3] && map1->tile_map[3]->tile_map[0] == map2)
    {                           /* left up */
      *dx = -map1->tile_map[3]->width;
      *dy = -map2->height;
    }
  else if (map1->tile_map[3] && map1->tile_map[3]->tile_map[2] == map2)
    {                           /* left down */
      *dx = -map1->tile_map[3]->width;
      *dy = map1->tile_map[3]->height;
    }
  else
    return 0;

  return 1;
}

maptile *
maptile::xy_load (sint16 &x, sint16 &y)
{
  maptile *map = xy_find (x, y);

  if (map)
    map->load_sync ();

  return map;
}

maptile *
get_map_from_coord (maptile *m, sint16 *x, sint16 *y)
{
  return m->xy_load (*x, *y);
}

/* From map.c
 * This is used by get_player to determine where the other
 * creature is.  get_rangevector takes into account map tiling,
 * so you just can not look the the map coordinates and get the
 * righte value.  distance_x/y are distance away, which
 * can be negative.  direction is the crossfire direction scheme
 * that the creature should head.  part is the part of the
 * monster that is closest.
 * 
 * get_rangevector looks at op1 and op2, and fills in the
 * structure for op1 to get to op2.
 * We already trust that the caller has verified that the
 * two objects are at least on adjacent maps.  If not,
 * results are not likely to be what is desired.
 * if the objects are not on maps, results are also likely to
 * be unexpected
 *
 * currently, the only flag supported (0x1) is don't translate for
 * closest body part of 'op1'
 */
void
get_rangevector (object *op1, 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 = 10000;
      retval->distance_x = 10000;
      retval->distance_y = 10000;
      retval->direction = 0;
      retval->part = 0;
    }
  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)
        {
          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 (object *tmp = op1->more; tmp; 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 = upos_max (abs (retval->distance_x), abs (retval->distance_y));
      retval->direction = find_dir_2 (-retval->distance_x, -retval->distance_y);
    }
}

/* this is basically the same as get_rangevector above, but instead of 
 * the first parameter being an object, it instead is the map
 * and x,y coordinates - this is used for path to player - 
 * since the object is not infact moving but we are trying to traverse
 * the path, we need this.
 * flags has no meaning for this function at this time - I kept it in to
 * be more consistant with the above function and also in case they are needed
 * for something in the future.  Also, since no object is pasted, the best
 * field of the rv_vector is set to NULL.
 */
void
get_rangevector_from_mapcoord (const maptile *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 = 0;
    }
  else
    {
      retval->distance_x += op2->x - x;
      retval->distance_y += op2->y - y;

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

/* Returns true of op1 and op2 are effectively on the same map
 * (as related to map tiling).  Note that this looks for a path from
 * op1 to op2, so if the tiled maps are asymetric and op2 has a path
 * to op1, this will still return false.
 * Note we only look one map out to keep the processing simple
 * and efficient.  This could probably be a macro.
 * MSW 2001-08-05
 */
int
on_same_map (const object *op1, const object *op2)
{
  int dx, dy;

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

object *
maptile::insert (object *op, int x, int y, object *originator, int flags)
{
  if (!op->flag [FLAG_REMOVED])
    op->remove ();

  return insert_ob_in_map_at (op, this, originator, flags, x, y);
}

region *
maptile::region (int x, int y) const
{
  if (regions
      && regionmap
      && !OUT_OF_REAL_MAP (this, x, y))
    if (struct region *reg = regionmap [regions [y * width + x]])
      return reg;

  if (default_region)
    return default_region;

  return ::region::default_region ();
}

/* picks a random object from a style map.
 * Redone by MSW so it should be faster and not use static
 * variables to generate tables.
 */
object *
maptile::pick_random_object () const
{
  /* while returning a null object will result in a crash, that
   * is actually preferable to an infinite loop.  That is because
   * most servers will automatically restart in case of crash.
   * Change the logic on getting the random space - shouldn't make
   * any difference, but this seems clearer to me.
   */
  for (int i = 1000; --i;)
    {
      object *pick = at (rndm (width), rndm (height)).bot;

      // do not prefer big monsters just because they are big.
      if (pick && pick->head_ () == pick)
        return pick->head_ ();
    }

  // instead of crashing in the unlikely(?) case, try to return *something*
  return get_archetype ("blocked");
}

Revision:	1.102
Committed:	Thu May 17 21:32:08 2007 UTC (17 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.101:	+13 -12 lines
Log Message:	- prepare common/ for head_ => head change - add some copyrights for files where they were missing