server/random_maps/style.C


/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
    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[1024];
  char style_file_full_path[1024];
  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::find_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::find_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::find_sync (style_file_path);
        }

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

      free (namelist);
    }

  if (style_map)
    {
      style_map->load_sync ();
      style_map->deactivate ();
    }

  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)
{
  /* 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 *new_obj = style->at (RANDOM () % style->width, RANDOM () % style->height).bot;

      if (new_obj)
        return new_obj->head_ ();
    }

  // instead of crashing in the unlikely case, try to return *something*
  return get_archetype ("blocked");
}
Revision:	1.20
Committed:	Sat Jan 6 14:42:30 2007 UTC (17 years, 5 months ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+1 -0 lines
Log Message:	added some copyrights
#	Content
1
2	/*
3	CrossFire, A Multiplayer game for X-windows
4
5	Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
6	Copyright (C) 2002 Mark Wedel & Crossfire Development Team
7	Copyright (C) 1992 Frank Tore Johansen
8
9	This program is free software; you can redistribute it and/or modify
10	it under the terms of the GNU General Public License as published by
11	the Free Software Foundation; either version 2 of the License, or
12	(at your option) any later version.
13
14	This program is distributed in the hope that it will be useful,
15	but WITHOUT ANY WARRANTY; without even the implied warranty of
16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17	GNU General Public License for more details.
18
19	You should have received a copy of the GNU General Public License
20	along with this program; if not, write to the Free Software
21	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23	The authors can be reached via e-mail at <crossfire@schmorp.de>
24	*/
25
26	#include <global.h>
27	#include <random_map.h>
28	#include <dirent.h>
29	#include <sys/stat.h>
30	#include <unistd.h>
31	#include "../include/autoconf.h"
32
33	static int
34	pointer_strcmp (const void p1, const void p2)
35	{
36	const char s1 = (const char **) p1;
37	const char s2 = (const char **) p2;
38
39	return (strcmp (s1, s2));
40	}
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	int
57	load_dir (const char dir, char **namelist, int skip_dirs)
58	{
59	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	}
79	}
80
81	if (entries == entry_size)
82	{
83	entry_size += 10;
84	rn = (char *) realloc (rn, sizeof (char ) * entry_size);
85	}
86	rn[entries] = strdup (d->d_name);
87	entries++;
88
89	}
90	(void) closedir (dp);
91
92	qsort (rn, entries, sizeof (char *), pointer_strcmp);
93
94	*namelist = rn;
95	return entries;
96	}
97
98	maptile *
99	find_style (const char dirname, const char stylename, int difficulty)
100	{
101	char style_file_path[1024];
102	char style_file_full_path[1024];
103	maptile *style_map = NULL;
104	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
116	if (stat (style_file_full_path, &file_stat) == 0 && !S_ISDIR (file_stat.st_mode))
117	style_map = maptile::find_sync (style_file_path);
118
119	if (!style_map) /* maybe we were given a directory! */
120	{
121	char **namelist;
122	int n;
123	char style_dir_full_path[256];
124
125	/* get the names of all the files in that directory */
126	sprintf (style_dir_full_path, "%s/maps%s", settings.datadir, style_file_path);
127
128	/* First, skip subdirectories. If we don't find anything, then try again
129	* without skipping subdirs.
130	*/
131	n = load_dir (style_dir_full_path, &namelist, 1);
132
133	if (n <= 0)
134	{
135	n = load_dir (style_dir_full_path, &namelist, 0);
136	only_subdirs = 1;
137	}
138
139	if (n <= 0)
140	return 0; /* nothing to load. Bye. */
141
142	/* Picks a random map. Note that if this is all directories,
143	* we know it won't be able to load, so save a few ticks.
144	* the door handling checks for this failure and handles
145	* it properly.
146	*/
147	if (difficulty == -1)
148	{ /* pick a random style from this dir. */
149	if (only_subdirs)
150	style_map = 0;
151	else
152	{
153	strcat (style_file_path, "/");
154	strcat (style_file_path, namelist[RANDOM () % n]);
155	style_map = maptile::find_sync (style_file_path);
156	}
157	}
158	else
159	{ /* find the map closest in difficulty */
160	int min_dist = 32000, min_index = -1;
161
162	for (i = 0; i < n; i++)
163	{
164	int dist;
165	char *mfile_name = strrchr (namelist[i], '_') + 1;
166
167	if ((mfile_name - 1) == NULL)
168	{ /* since there isn't a sequence, */
169	int q;
170
171	/pick one at random to recurse /
172	style_map = find_style (style_file_path, namelist[RANDOM () % n], difficulty);
173	for (q = 0; q < n; q++)
174	free (namelist[q]);
175	free (namelist);
176	return style_map;
177	}
178	else
179	{
180	dist = abs (difficulty - atoi (mfile_name));
181	if (dist < min_dist)
182	{
183	min_dist = dist;
184	min_index = i;
185	}
186	}
187	}
188
189	/* presumably now we've found the "best" match for the
190	difficulty. */
191	strcat (style_file_path, "/");
192	strcat (style_file_path, namelist[min_index]);
193	style_map = maptile::find_sync (style_file_path);
194	}
195
196	for (i = 0; i < n; i++)
197	free (namelist[i]);
198
199	free (namelist);
200	}
201
202	if (style_map)
203	{
204	style_map->load_sync ();
205	style_map->deactivate ();
206	}
207
208	return style_map;
209
210	}
211
212	/* picks a random object from a style map.
213	* Redone by MSW so it should be faster and not use static
214	* variables to generate tables.
215	*/
216	object *
217	pick_random_object (maptile *style)
218	{
219	/* while returning a null object will result in a crash, that
220	* is actually preferable to an infinite loop. That is because
221	* most servers will automatically restart in case of crash.
222	* Change the logic on getting the random space - shouldn't make
223	* any difference, but this seems clearer to me.
224	*/
225	for (int i = 1000; --i;)
226	{
227	object *new_obj = style->at (RANDOM () % style->width, RANDOM () % style->height).bot;
228
229	if (new_obj)
230	return new_obj->head_ ();
231	}
232
233	// instead of crashing in the unlikely case, try to return something
234	return get_archetype ("blocked");
235	}