server/random_maps/style.C

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 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 <global.h>
#include <random_map.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../include/autoconf.h"


static int
pointer_strcmp (const void *p1, const void *p2)
{
  const char *s1 = *(const char **) p1;
  const char *s2 = *(const char **) p2;

  return (strcmp (s1, s2));
}

/* This is our own version of scandir/select_regular_files/sort.
 * To support having subdirectories in styles, we need to know
 * if in fact the directory we read is a subdirectory.  However,
 * we can't get that through the normal dirent entry.  So
 * instead, we do our own where we do have the full directory
 * path so can do stat calls to see if in fact it is a directory.
 * dir is the name of the director to scan.
 * namelist is the array of file names returned.  IT needs to be
 * freed by the caller.
 * skip_dirs controls our behavioru - if nonzero, we don't
 * skip any subdirectories - if zero, we store those away,
 * since there are cases where we want to choose a random
 * directory. 
 */
int
load_dir (const char *dir, char ***namelist, int skip_dirs)
{
  DIR *dp;
  struct dirent *d;
  int entries = 0, entry_size = 0;
  char name[NAME_MAX + 1], **rn = NULL;
  struct stat sb;

  dp = opendir (dir);
  if (dp == NULL)
    return -1;

  while ((d = readdir (dp)) != NULL)
    {
      sprintf (name, "%s/%s", dir, d->d_name);
      if (skip_dirs)
        {
          stat (name, &sb);
          if (S_ISDIR (sb.st_mode))
            {
              continue;
            }
        }

      if (entries == entry_size)
        {
          entry_size += 10;
          rn = (char **) realloc (rn, sizeof (char *) * entry_size);
        }
      rn[entries] = strdup (d->d_name);
      entries++;

    }
  (void) closedir (dp);

  qsort (rn, entries, sizeof (char *), pointer_strcmp);

  *namelist = rn;
  return entries;
}

maptile *
find_style (const char *dirname, const char *stylename, int difficulty)
{
  char style_file_path[256];
  char style_file_full_path[256];
  maptile *style_map = NULL;
  struct stat file_stat;
  int i, only_subdirs = 0;

  /* if stylename exists, set style_file_path to that file. */
  if (stylename && strlen (stylename) > 0)
    sprintf (style_file_path, "%s/%s", dirname, stylename);
  else                          /* otherwise, just use the dirname.  We'll pick a random stylefile. */
    sprintf (style_file_path, "%s", dirname);

  /* is what we were given a directory, or a file? */
  sprintf (style_file_full_path, "%s/maps%s", settings.datadir, style_file_path);
  if (stat (style_file_full_path, &file_stat) == 0 && !S_ISDIR (file_stat.st_mode))
    style_map = maptile::load_map_sync (style_file_path);

  if (!style_map)        /* maybe we were given a directory! */
    {
      char **namelist;
      int n;
      char style_dir_full_path[256];

      /* get the names of all the files in that directory */
      sprintf (style_dir_full_path, "%s/maps%s", settings.datadir, style_file_path);

      /* First, skip subdirectories.  If we don't find anything, then try again
       * without skipping subdirs.
       */
      n = load_dir (style_dir_full_path, &namelist, 1);

      if (n <= 0)
        {
          n = load_dir (style_dir_full_path, &namelist, 0);
          only_subdirs = 1;
        }

      if (n <= 0)
        return 0;               /* nothing to load.  Bye. */

      /* Picks a random map.  Note that if this is all directories,
       * we know it won't be able to load, so save a few ticks.   
       * the door handling checks for this failure and handles
       * it properly.
       */
      if (difficulty == -1)
        {                       /* pick a random style from this dir. */
          if (only_subdirs)
            style_map = 0;
          else
            {
              strcat (style_file_path, "/");
              strcat (style_file_path, namelist[RANDOM () % n]);
              style_map = maptile::load_map_sync (style_file_path);
            }
        }
      else
        {                       /* find the map closest in difficulty */
          int min_dist = 32000, min_index = -1;

          for (i = 0; i < n; i++)
            {
              int dist;
              char *mfile_name = strrchr (namelist[i], '_') + 1;

              if ((mfile_name - 1) == NULL)
                {               /* since there isn't a sequence, */
                  int q;

                  /*pick one at random to recurse */
                  style_map = find_style (style_file_path, namelist[RANDOM () % n], difficulty);
                  for (q = 0; q < n; q++)
                    free (namelist[q]);
                  free (namelist);
                  return style_map;
                }
              else
                {
                  dist = abs (difficulty - atoi (mfile_name));
                  if (dist < min_dist)
                    {
                      min_dist = dist;
                      min_index = i;
                    }
                }
            }
          /* presumably now we've found the "best" match for the
             difficulty. */
          strcat (style_file_path, "/");
          strcat (style_file_path, namelist[min_index]);
          style_map = maptile::load_map_sync (style_file_path);
        }

      for (i = 0; i < n; i++)
        free (namelist[i]);

      free (namelist);
    }

  return style_map;

}

/* 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 *
pick_random_object (maptile *style)
{
  int x, y, limit = 0;
  object *new_obj;

  /* 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.
   */
  do
    {
      limit++;
      x = RANDOM () % style->width;
      y = RANDOM () % style->height;
      new_obj = GET_MAP_OB (style, x, y);
    }
  while (new_obj == NULL && limit < 1000);

  if (new_obj->head)
    return new_obj->head;
  else
    return new_obj;
}

Revision:	1.13
Committed:	Sun Dec 31 10:28:36 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+9 -28 lines
Log Message:	different interface design for c++/perl map handling, some random map framework
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 2002 Mark Wedel & Crossfire Development Team
5			Copyright (C) 1992 Frank Tore Johansen
6
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21	root	1.4	The authors can be reached via e-mail at <crossfire@schmorp.de>
22	elmex	1.1	*/
23
24
25			#include <global.h>
26			#include <random_map.h>
27	pippijn	1.6	#include <dirent.h>
28			#include <sys/stat.h>
29			#include <unistd.h>
30			#include "../include/autoconf.h"
31	elmex	1.1
32
33	root	1.3	static int
34			pointer_strcmp (const void p1, const void p2)
35	elmex	1.1	{
36	root	1.3	const char s1 = (const char **) p1;
37			const char s2 = (const char **) p2;
38	elmex	1.1
39	root	1.3	return (strcmp (s1, s2));
40	elmex	1.1	}
41
42			/* This is our own version of scandir/select_regular_files/sort.
43			* To support having subdirectories in styles, we need to know
44			* if in fact the directory we read is a subdirectory. However,
45			* we can't get that through the normal dirent entry. So
46			* instead, we do our own where we do have the full directory
47			* path so can do stat calls to see if in fact it is a directory.
48			* dir is the name of the director to scan.
49			* namelist is the array of file names returned. IT needs to be
50			* freed by the caller.
51			* skip_dirs controls our behavioru - if nonzero, we don't
52			* skip any subdirectories - if zero, we store those away,
53			* since there are cases where we want to choose a random
54			* directory.
55			*/
56	root	1.3	int
57			load_dir (const char dir, char **namelist, int skip_dirs)
58	elmex	1.1	{
59	root	1.3	DIR *dp;
60			struct dirent *d;
61			int entries = 0, entry_size = 0;
62			char name[NAME_MAX + 1], **rn = NULL;
63			struct stat sb;
64
65			dp = opendir (dir);
66			if (dp == NULL)
67			return -1;
68
69			while ((d = readdir (dp)) != NULL)
70			{
71			sprintf (name, "%s/%s", dir, d->d_name);
72			if (skip_dirs)
73			{
74			stat (name, &sb);
75			if (S_ISDIR (sb.st_mode))
76			{
77			continue;
78	root	1.2	}
79			}
80
81	root	1.3	if (entries == entry_size)
82			{
83			entry_size += 10;
84			rn = (char *) realloc (rn, sizeof (char ) * entry_size);
85	root	1.2	}
86	root	1.7	rn[entries] = strdup (d->d_name);
87	root	1.3	entries++;
88	elmex	1.1
89			}
90	root	1.3	(void) closedir (dp);
91	elmex	1.1
92	root	1.3	qsort (rn, entries, sizeof (char *), pointer_strcmp);
93	elmex	1.1
94	root	1.3	*namelist = rn;
95			return entries;
96	elmex	1.1	}
97
98	root	1.5	maptile *
99	root	1.3	find_style (const char dirname, const char stylename, int difficulty)
100			{
101			char style_file_path[256];
102			char style_file_full_path[256];
103	root	1.5	maptile *style_map = NULL;
104	root	1.3	struct stat file_stat;
105			int i, only_subdirs = 0;
106
107			/* if stylename exists, set style_file_path to that file. */
108			if (stylename && strlen (stylename) > 0)
109			sprintf (style_file_path, "%s/%s", dirname, stylename);
110			else /* otherwise, just use the dirname. We'll pick a random stylefile. */
111			sprintf (style_file_path, "%s", dirname);
112
113			/* is what we were given a directory, or a file? */
114			sprintf (style_file_full_path, "%s/maps%s", settings.datadir, style_file_path);
115			if (stat (style_file_full_path, &file_stat) == 0 && !S_ISDIR (file_stat.st_mode))
116	root	1.13	style_map = maptile::load_map_sync (style_file_path);
117
118			if (!style_map) /* maybe we were given a directory! */
119	elmex	1.1	{
120	root	1.3	char **namelist;
121			int n;
122			char style_dir_full_path[256];
123
124			/* get the names of all the files in that directory */
125			sprintf (style_dir_full_path, "%s/maps%s", settings.datadir, style_file_path);
126
127			/* First, skip subdirectories. If we don't find anything, then try again
128			* without skipping subdirs.
129			*/
130			n = load_dir (style_dir_full_path, &namelist, 1);
131
132			if (n <= 0)
133			{
134			n = load_dir (style_dir_full_path, &namelist, 0);
135			only_subdirs = 1;
136	root	1.2	}
137
138	root	1.3	if (n <= 0)
139			return 0; /* nothing to load. Bye. */
140	root	1.2
141	root	1.3	/* Picks a random map. Note that if this is all directories,
142			* we know it won't be able to load, so save a few ticks.
143			* the door handling checks for this failure and handles
144			* it properly.
145			*/
146			if (difficulty == -1)
147			{ /* pick a random style from this dir. */
148			if (only_subdirs)
149	root	1.13	style_map = 0;
150	root	1.3	else
151			{
152			strcat (style_file_path, "/");
153			strcat (style_file_path, namelist[RANDOM () % n]);
154	root	1.13	style_map = maptile::load_map_sync (style_file_path);
155	root	1.2	}
156			}
157	root	1.3	else
158			{ /* find the map closest in difficulty */
159			int min_dist = 32000, min_index = -1;
160
161			for (i = 0; i < n; i++)
162			{
163			int dist;
164			char *mfile_name = strrchr (namelist[i], '_') + 1;
165
166			if ((mfile_name - 1) == NULL)
167			{ /* since there isn't a sequence, */
168			int q;
169
170			/pick one at random to recurse /
171			style_map = find_style (style_file_path, namelist[RANDOM () % n], difficulty);
172			for (q = 0; q < n; q++)
173			free (namelist[q]);
174			free (namelist);
175			return style_map;
176			}
177			else
178			{
179			dist = abs (difficulty - atoi (mfile_name));
180			if (dist < min_dist)
181			{
182			min_dist = dist;
183			min_index = i;
184	root	1.2	}
185			}
186			}
187	root	1.3	/* presumably now we've found the "best" match for the
188			difficulty. */
189			strcat (style_file_path, "/");
190			strcat (style_file_path, namelist[min_index]);
191	root	1.13	style_map = maptile::load_map_sync (style_file_path);
192	root	1.2	}
193	root	1.13
194	root	1.3	for (i = 0; i < n; i++)
195			free (namelist[i]);
196	root	1.13
197	root	1.3	free (namelist);
198	elmex	1.1	}
199	root	1.13
200	elmex	1.1	return style_map;
201
202			}
203
204			/* picks a random object from a style map.
205			* Redone by MSW so it should be faster and not use static
206			* variables to generate tables.
207			*/
208	root	1.3	object *
209	root	1.5	pick_random_object (maptile *style)
210	root	1.3	{
211			int x, y, limit = 0;
212			object *new_obj;
213
214			/* while returning a null object will result in a crash, that
215			* is actually preferable to an infinite loop. That is because
216			* most servers will automatically restart in case of crash.
217			* Change the logic on getting the random space - shouldn't make
218			* any difference, but this seems clearer to me.
219			*/
220			do
221			{
222			limit++;
223	root	1.9	x = RANDOM () % style->width;
224			y = RANDOM () % style->height;
225	root	1.8	new_obj = GET_MAP_OB (style, x, y);
226	root	1.3	}
227			while (new_obj == NULL && limit < 1000);
228	root	1.12
229	root	1.3	if (new_obj->head)
230			return new_obj->head;
231			else
232			return new_obj;
233	elmex	1.1	}
234