| 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 |
The authors can be reached via e-mail at <crossfire@schmorp.de> |
| 22 |
*/ |
| 23 |
|
| 24 |
|
| 25 |
#include <global.h> |
| 26 |
#include <random_map.h> |
| 27 |
#include <dirent.h> |
| 28 |
#include <sys/stat.h> |
| 29 |
#include <unistd.h> |
| 30 |
#include "../include/autoconf.h" |
| 31 |
|
| 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[256]; |
| 102 |
char style_file_full_path[256]; |
| 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 |
if (stat (style_file_full_path, &file_stat) == 0 && !S_ISDIR (file_stat.st_mode)) |
| 116 |
style_map = maptile::load_map_sync (style_file_path); |
| 117 |
|
| 118 |
if (!style_map) /* maybe we were given a directory! */ |
| 119 |
{ |
| 120 |
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 |
} |
| 137 |
|
| 138 |
if (n <= 0) |
| 139 |
return 0; /* nothing to load. Bye. */ |
| 140 |
|
| 141 |
/* 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 |
style_map = 0; |
| 150 |
else |
| 151 |
{ |
| 152 |
strcat (style_file_path, "/"); |
| 153 |
strcat (style_file_path, namelist[RANDOM () % n]); |
| 154 |
style_map = maptile::load_map_sync (style_file_path); |
| 155 |
} |
| 156 |
} |
| 157 |
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 |
} |
| 185 |
} |
| 186 |
} |
| 187 |
/* 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 |
style_map = maptile::load_map_sync (style_file_path); |
| 192 |
} |
| 193 |
|
| 194 |
for (i = 0; i < n; i++) |
| 195 |
free (namelist[i]); |
| 196 |
|
| 197 |
free (namelist); |
| 198 |
} |
| 199 |
|
| 200 |
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 |
object * |
| 209 |
pick_random_object (maptile *style) |
| 210 |
{ |
| 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 |
x = RANDOM () % style->width; |
| 224 |
y = RANDOM () % style->height; |
| 225 |
new_obj = GET_MAP_OB (style, x, y); |
| 226 |
} |
| 227 |
while (new_obj == NULL && limit < 1000); |
| 228 |
|
| 229 |
if (new_obj->head) |
| 230 |
return new_obj->head; |
| 231 |
else |
| 232 |
return new_obj; |
| 233 |
} |
| 234 |
|
