server/common/map.C

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 2001-2003,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT 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 3 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, see <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <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 (tmp->flag [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 = (archetype *)tmp->more)
    {
      flag = get_map_flags (m, &m1, x + tmp->x, y + tmp->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 (;;)
    {
      thawer.next ();

      switch (thawer.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_no_reset:   thawer.get (no_reset);   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 (no_reset);
  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)
          {
            op = op->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 ();
}

/* decay and destroy perishable items in a map */
void
maptile::do_decay_objects ()
{
  if (!spaces)
    return;

  for (mapspace *ms = spaces + size (); ms-- > spaces; )
    for (object *above, *op = ms->bot; op; op = above)
      {
        above = op->above;

        bool destroy = 0;

        // do not decay anything above unique floor tiles (yet :)
        if (QUERY_FLAG (op, FLAG_IS_FLOOR) && QUERY_FLAG (op, FLAG_UNIQUE))
          break;

        if (QUERY_FLAG (op, FLAG_IS_FLOOR)
            || QUERY_FLAG (op, FLAG_OBJ_ORIGINAL)
            || QUERY_FLAG (op, FLAG_OBJ_SAVE_ON_OVL)
            || QUERY_FLAG (op, FLAG_UNIQUE)
            || QUERY_FLAG (op, FLAG_OVERLAY_FLOOR)
            || QUERY_FLAG (op, FLAG_UNPAID)
            || op->is_alive ())
          ; // do not decay
        else if (op->is_weapon ())
          {
            op->stats.dam--;
            if (op->stats.dam < 0)
              destroy = 1;
          }
        else if (op->is_armor ())
          {
            op->stats.ac--;
            if (op->stats.ac < 0)
              destroy = 1;
          }
        else if (op->type == FOOD)
          {
            op->stats.food -= rndm (5, 20);
            if (op->stats.food < 0)
              destroy = 1;
          }
        else
          {
            int mat = op->materials;

            if (mat & M_PAPER
                || mat & M_LEATHER
                || mat & M_WOOD
                || mat & M_ORGANIC
                || mat & M_CLOTH
                || mat & M_LIQUID
                || (mat & M_IRON  && rndm (1, 5) == 1)
                || (mat & M_GLASS && rndm (1, 2) == 1)
                || ((mat & M_STONE      || mat & M_ADAMANT) && rndm (1, 10) == 1)
                || ((mat & M_SOFT_METAL || mat & M_BONE)    && rndm (1, 3)  == 1)
                || (mat & M_ICE && temp > 32))
              destroy = 1;
          }

        /* adjust overall chance below */
        if (destroy && rndm (0, 1))
          op->destroy ();
      }
}

/*
 * 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->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:	1.110
Committed:	Sun Jul 1 05:00:17 2007 UTC (16 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.109:	+11 -12 lines
Log Message:	- upgrade crossfire trt to the GPL version 3 (hopefully correctly). - add a single file covered by the GNU Affero General Public License (which is not yet released, so I used the current draft, which is legally a bit wavy, but its likely better than nothing as it expresses direct intent by the authors, and we can upgrade as soon as it has been released). * this should ensure availability of source code for the server at least and hopefully also archetypes and maps even when modified versions are not being distributed, in accordance of section 13 of the agplv3.