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)
    return -1;

  while ((d = readdir (dp)))
    {
      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.map", 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[rndm (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[rndm (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;
}
Revision:	1.24
Committed:	Sat Feb 17 23:32:11 2007 UTC (17 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_0, rel-2_1
Changes since 1.23:	+0 -26 lines
Log Message:	- prepare find_style_map rewrite - move pick_random_object to maptile:: - make pick_random_object fair overe the numbe rof monsters and no longer prefer big monsters.
#	User	Rev	Content
1	elmex	1.1	/*
2	pippijn	1.21	* CrossFire, A Multiplayer game for X-windows
3			*
4			* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5			* Copyright (C) 2002 Mark Wedel & Crossfire Development Team
6			* Copyright (C) 1992 Frank Tore Johansen
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*
22			* The authors can be reached via e-mail at <crossfire@schmorp.de>
23			*/
24	elmex	1.1
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	root	1.3	static int
33			pointer_strcmp (const void p1, const void p2)
34	elmex	1.1	{
35	root	1.3	const char s1 = (const char **) p1;
36			const char s2 = (const char **) p2;
37	elmex	1.1
38	root	1.3	return (strcmp (s1, s2));
39	elmex	1.1	}
40
41			/* This is our own version of scandir/select_regular_files/sort.
42			* To support having subdirectories in styles, we need to know
43			* if in fact the directory we read is a subdirectory. However,
44			* we can't get that through the normal dirent entry. So
45			* instead, we do our own where we do have the full directory
46			* path so can do stat calls to see if in fact it is a directory.
47			* dir is the name of the director to scan.
48			* namelist is the array of file names returned. IT needs to be
49			* freed by the caller.
50			* skip_dirs controls our behavioru - if nonzero, we don't
51			* skip any subdirectories - if zero, we store those away,
52			* since there are cases where we want to choose a random
53			* directory.
54			*/
55	root	1.3	int
56			load_dir (const char dir, char **namelist, int skip_dirs)
57	elmex	1.1	{
58	root	1.3	DIR *dp;
59			struct dirent *d;
60			int entries = 0, entry_size = 0;
61			char name[NAME_MAX + 1], **rn = NULL;
62			struct stat sb;
63
64			dp = opendir (dir);
65	root	1.23	if (!dp)
66	root	1.3	return -1;
67
68	root	1.23	while ((d = readdir (dp)))
69	root	1.3	{
70			sprintf (name, "%s/%s", dir, d->d_name);
71			if (skip_dirs)
72			{
73			stat (name, &sb);
74			if (S_ISDIR (sb.st_mode))
75	root	1.23	continue;
76	root	1.2	}
77
78	root	1.3	if (entries == entry_size)
79			{
80			entry_size += 10;
81			rn = (char *) realloc (rn, sizeof (char ) * entry_size);
82	root	1.2	}
83	root	1.7	rn[entries] = strdup (d->d_name);
84	root	1.3	entries++;
85	elmex	1.1
86			}
87	root	1.3	(void) closedir (dp);
88	elmex	1.1
89	root	1.3	qsort (rn, entries, sizeof (char *), pointer_strcmp);
90	elmex	1.1
91	root	1.3	*namelist = rn;
92			return entries;
93	elmex	1.1	}
94
95	root	1.5	maptile *
96	root	1.3	find_style (const char dirname, const char stylename, int difficulty)
97			{
98	root	1.18	char style_file_path[1024];
99			char style_file_full_path[1024];
100	root	1.5	maptile *style_map = NULL;
101	root	1.3	struct stat file_stat;
102			int i, only_subdirs = 0;
103
104			/* if stylename exists, set style_file_path to that file. */
105			if (stylename && strlen (stylename) > 0)
106			sprintf (style_file_path, "%s/%s", dirname, stylename);
107			else /* otherwise, just use the dirname. We'll pick a random stylefile. */
108			sprintf (style_file_path, "%s", dirname);
109
110			/* is what we were given a directory, or a file? */
111	root	1.23	sprintf (style_file_full_path, "%s/maps%s.map", settings.datadir, style_file_path);
112	root	1.14
113	root	1.3	if (stat (style_file_full_path, &file_stat) == 0 && !S_ISDIR (file_stat.st_mode))
114	root	1.19	style_map = maptile::find_sync (style_file_path);
115	root	1.13
116	root	1.17	if (!style_map) /* maybe we were given a directory! */
117	elmex	1.1	{
118	root	1.3	char **namelist;
119			int n;
120			char style_dir_full_path[256];
121
122			/* get the names of all the files in that directory */
123			sprintf (style_dir_full_path, "%s/maps%s", settings.datadir, style_file_path);
124
125			/* First, skip subdirectories. If we don't find anything, then try again
126			* without skipping subdirs.
127			*/
128			n = load_dir (style_dir_full_path, &namelist, 1);
129
130			if (n <= 0)
131			{
132			n = load_dir (style_dir_full_path, &namelist, 0);
133			only_subdirs = 1;
134	root	1.2	}
135
136	root	1.3	if (n <= 0)
137			return 0; /* nothing to load. Bye. */
138	root	1.2
139	root	1.3	/* Picks a random map. Note that if this is all directories,
140			* we know it won't be able to load, so save a few ticks.
141			* the door handling checks for this failure and handles
142			* it properly.
143			*/
144			if (difficulty == -1)
145			{ /* pick a random style from this dir. */
146			if (only_subdirs)
147	root	1.13	style_map = 0;
148	root	1.3	else
149			{
150			strcat (style_file_path, "/");
151	root	1.22	strcat (style_file_path, namelist[rndm (n)]);
152	root	1.19	style_map = maptile::find_sync (style_file_path);
153	root	1.2	}
154			}
155	root	1.3	else
156			{ /* find the map closest in difficulty */
157			int min_dist = 32000, min_index = -1;
158
159			for (i = 0; i < n; i++)
160			{
161			int dist;
162			char *mfile_name = strrchr (namelist[i], '_') + 1;
163
164			if ((mfile_name - 1) == NULL)
165			{ /* since there isn't a sequence, */
166			int q;
167
168			/pick one at random to recurse /
169	root	1.22	style_map = find_style (style_file_path, namelist[rndm (n)], difficulty);
170	root	1.3	for (q = 0; q < n; q++)
171			free (namelist[q]);
172			free (namelist);
173			return style_map;
174			}
175			else
176			{
177			dist = abs (difficulty - atoi (mfile_name));
178			if (dist < min_dist)
179			{
180			min_dist = dist;
181			min_index = i;
182	root	1.2	}
183			}
184			}
185	root	1.15
186	root	1.3	/* presumably now we've found the "best" match for the
187			difficulty. */
188			strcat (style_file_path, "/");
189			strcat (style_file_path, namelist[min_index]);
190	root	1.19	style_map = maptile::find_sync (style_file_path);
191	root	1.2	}
192	root	1.13
193	root	1.3	for (i = 0; i < n; i++)
194			free (namelist[i]);
195	root	1.13
196	root	1.3	free (namelist);
197	elmex	1.1	}
198	root	1.13
199	root	1.15	if (style_map)
200	root	1.19	{
201			style_map->load_sync ();
202			style_map->deactivate ();
203			}
204	root	1.15
205	elmex	1.1	return style_map;
206			}