1 |
/* |
2 |
* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 |
* |
4 |
* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 |
* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team |
6 |
* Copyright (©) 1992,2007 Frank Tore Johansen |
7 |
* |
8 |
* Deliantra 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 3 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, see <http://www.gnu.org/licenses/>. |
20 |
* |
21 |
* The authors can be reached via e-mail to <support@deliantra.net> |
22 |
*/ |
23 |
|
24 |
#include <assert.h> |
25 |
#include <stdio.h> |
26 |
#include <string.h> |
27 |
#include <global.h> |
28 |
|
29 |
#include "define.h" |
30 |
#include "path.h" |
31 |
|
32 |
|
33 |
#if 0 |
34 |
|
35 |
/** |
36 |
* Define DEBUG_PATH to enable debug output. |
37 |
*/ |
38 |
# define DEBUG_PATH |
39 |
#endif |
40 |
|
41 |
#if 0 |
42 |
|
43 |
/** |
44 |
* Define TEST_PATH to compile this file as a stand-alone self-test application |
45 |
* for the functions. |
46 |
*/ |
47 |
# define TEST_PATH |
48 |
|
49 |
# define LOG fprintf |
50 |
# define llevDebug stderr |
51 |
# define llevError stderr |
52 |
#endif |
53 |
|
54 |
|
55 |
char * |
56 |
path_combine (const char *src, const char *dst) |
57 |
{ |
58 |
char *p; |
59 |
static char path[HUGE_BUF]; |
60 |
|
61 |
if (*dst == '/') |
62 |
{ |
63 |
/* absolute destination path => ignore source path */ |
64 |
strcpy (path, dst); |
65 |
} |
66 |
else |
67 |
{ |
68 |
/* relative destination path => add after last '/' of source */ |
69 |
strcpy (path, src); |
70 |
p = strrchr (path, '/'); |
71 |
if (p != NULL) |
72 |
{ |
73 |
p++; |
74 |
} |
75 |
else |
76 |
{ |
77 |
p = path; |
78 |
if (*src == '/') |
79 |
*p++ = '/'; |
80 |
} |
81 |
strcpy (p, dst); |
82 |
} |
83 |
|
84 |
#if defined(DEBUG_PATH) |
85 |
LOG (llevDebug, "path_combine(%s, %s) = %s\n", src, dst, path); |
86 |
#endif |
87 |
return (path); |
88 |
} |
89 |
|
90 |
void |
91 |
path_normalize (char *path) |
92 |
{ |
93 |
char *p; /* points to the beginning of the path not yet processed; this is |
94 |
either a path component or a path separator character */ |
95 |
char *q; /* points to the end of the path component p points to */ |
96 |
char *w; /* points to the end of the already normalized path; w <= p is |
97 |
maintained */ |
98 |
size_t len; /* length of current component (which p points to) */ |
99 |
|
100 |
#if defined(DEBUG_PATH) |
101 |
LOG (llevDebug, "path_normalize: input '%s'\n", path); |
102 |
#endif |
103 |
|
104 |
p = path; |
105 |
w = p; |
106 |
while (*p != '\0') |
107 |
{ |
108 |
|
109 |
if (*p == '/') |
110 |
{ |
111 |
if ((w == path && *path == '/') || (w > path && w[-1] != '/')) |
112 |
*w++ = '/'; |
113 |
p++; |
114 |
continue; |
115 |
} |
116 |
|
117 |
q = strchr (p, '/'); |
118 |
if (q == NULL) |
119 |
q = p + strlen (p); |
120 |
len = q - p; |
121 |
assert (len > 0); |
122 |
|
123 |
#if defined(DEBUG_PATH) |
124 |
LOG (llevDebug, "path_normalize: checking '%.*s'\n", (int) len, p); |
125 |
#endif |
126 |
|
127 |
if (len == 1 && *p == '.') |
128 |
{ |
129 |
/* remove current component */ |
130 |
} |
131 |
else if (len == 2 && memcmp (p, "..", 2) == 0) |
132 |
{ |
133 |
if (w == path || (w == path + 3 && memcmp (path, "../", 3) == 0)) |
134 |
{ |
135 |
/* keep ".." at beginning of relative path ("../x" => "../x") */ |
136 |
memmove (w, p, len); |
137 |
w += len; |
138 |
} |
139 |
else if (w == path + 1 && *path == '/') |
140 |
{ |
141 |
/* remove ".." at beginning of absolute path ("/../x" => "/x") */ |
142 |
} |
143 |
else |
144 |
{ |
145 |
/* remove both current component ".." and preceding one */ |
146 |
if (w > path && w[-1] == '/') |
147 |
w--; |
148 |
while (w > path && w[-1] != '/') |
149 |
w--; |
150 |
} |
151 |
} |
152 |
else |
153 |
{ |
154 |
/* normal component ==> add it */ |
155 |
memmove (w, p, len); |
156 |
w += len; |
157 |
} |
158 |
|
159 |
p = q; |
160 |
|
161 |
#if defined(DEBUG_PATH) |
162 |
LOG (llevDebug, "path_normalize: so far '%.*s'\n", (int) (w - path), path); |
163 |
#endif |
164 |
} |
165 |
|
166 |
/* remove trailing slashes, but keep the one at the start of the path */ |
167 |
while (w > path + 1 && w[-1] == '/') |
168 |
{ |
169 |
w--; |
170 |
} |
171 |
|
172 |
*w = '\0'; |
173 |
|
174 |
#if defined(DEBUG_PATH) |
175 |
LOG (llevDebug, "path_normalize: result '%s'\n", path); |
176 |
#endif |
177 |
} |
178 |
|
179 |
char * |
180 |
path_combine_and_normalize (const char *src, const char *dst) |
181 |
{ |
182 |
char *path; |
183 |
|
184 |
path = path_combine (src, dst); |
185 |
path_normalize (path); |
186 |
return (path); |
187 |
} |
188 |
|
189 |
#if defined(TEST_PATH) |
190 |
static void |
191 |
check_combine (const char *src, const char *dst, const char *exp) |
192 |
{ |
193 |
const char *res; |
194 |
|
195 |
fprintf (stderr, "path_combine(%s, %s) = ", src, dst); |
196 |
res = path_combine (src, dst); |
197 |
fprintf (stderr, "%s", res); |
198 |
if (strcmp (res, exp) != 0) |
199 |
{ |
200 |
fprintf (stderr, ", should be %s\n", exp); |
201 |
} |
202 |
else |
203 |
{ |
204 |
fprintf (stderr, " (OK)\n"); |
205 |
} |
206 |
} |
207 |
|
208 |
static void |
209 |
check_normalize (const char *path, const char *exp0) |
210 |
{ |
211 |
char tmp[HUGE_BUF]; |
212 |
char exp[HUGE_BUF]; |
213 |
|
214 |
strcpy (exp, exp0 == NULL ? path : exp0); |
215 |
|
216 |
strcpy (tmp, path); |
217 |
fprintf (stderr, "path_normalize(%s) = ", tmp); |
218 |
path_normalize (tmp); |
219 |
fprintf (stderr, "%s", tmp); |
220 |
if (strcmp (tmp, exp) != 0) |
221 |
{ |
222 |
fprintf (stderr, ", should be %s\n", exp); |
223 |
} |
224 |
else |
225 |
{ |
226 |
fprintf (stderr, " (OK)\n"); |
227 |
} |
228 |
} |
229 |
|
230 |
static void |
231 |
check_combine_and_normalize (const char *src, const char *dst, const char *exp) |
232 |
{ |
233 |
const char *res; |
234 |
|
235 |
fprintf (stderr, "path_combine_and_normalize(%s, %s) = ", src, dst); |
236 |
res = path_combine_and_normalize (src, dst); |
237 |
fprintf (stderr, "%s", res); |
238 |
if (strcmp (res, exp) != 0) |
239 |
{ |
240 |
fprintf (stderr, ", should be %s\n", exp); |
241 |
} |
242 |
else |
243 |
{ |
244 |
fprintf (stderr, " (OK)\n"); |
245 |
} |
246 |
} |
247 |
|
248 |
int |
249 |
main () |
250 |
{ |
251 |
check_combine ("/path1/file1", "/path2/file2", "/path2/file2"); |
252 |
check_combine ("path1/file1", "/path2/file2", "/path2/file2"); |
253 |
check_combine ("/path1/file1", "path2/file2", "/path1/path2/file2"); |
254 |
check_combine ("path1/file1", "path2/file2", "path1/path2/file2"); |
255 |
check_combine ("/path1", "/path2", "/path2"); |
256 |
check_combine ("path1", "/path2", "/path2"); |
257 |
check_combine ("/path1", "path2", "/path2"); |
258 |
check_combine ("path1", "path2", "path2"); |
259 |
|
260 |
check_normalize ("", NULL); |
261 |
check_normalize ("/", NULL); |
262 |
check_normalize ("path1/file1", NULL); |
263 |
check_normalize ("/path1/file1", NULL); |
264 |
check_normalize ("/path1//file1", "/path1/file1"); |
265 |
check_normalize ("//path1/file1", "/path1/file1"); |
266 |
check_normalize ("///////x////////y///////z////////", "/x/y/z"); |
267 |
check_normalize ("/a/b/../c/d/../e/../../f/g/../h", "/a/f/h"); |
268 |
check_normalize ("//a//b//..//c//d//..//e//..//..//f//g//..//h", "/a/f/h"); |
269 |
check_normalize ("../a", NULL); |
270 |
check_normalize ("a/../../b", "../b"); |
271 |
check_normalize ("/../a", "/a"); |
272 |
check_normalize ("/a/../../b", "/b"); |
273 |
check_normalize ("./b/./c/.d/..e/./f", "b/c/.d/..e/f"); |
274 |
check_normalize ("/b/././././e", "/b/e"); |
275 |
check_normalize (".", ""); /* maybe the result should be "."? */ |
276 |
check_normalize ("/.", "/"); |
277 |
check_normalize ("./", ""); /* maybe the result should be "."? */ |
278 |
check_normalize ("/a/b/..", "/a"); |
279 |
check_normalize ("/a/b/../..", "/"); |
280 |
check_normalize ("/a/b/../../..", "/"); |
281 |
check_normalize ("a/b/..", "a"); |
282 |
check_normalize ("a/b/../..", ""); |
283 |
check_normalize ("a/b/../../..", ".."); |
284 |
|
285 |
check_combine_and_normalize ("/path1/file1", "/path2/file2", "/path2/file2"); |
286 |
check_combine_and_normalize ("path1/file1", "/path2/file2", "/path2/file2"); |
287 |
check_combine_and_normalize ("/path1/file1", "path2/file2", "/path1/path2/file2"); |
288 |
check_combine_and_normalize ("/path1", "/path2", "/path2"); |
289 |
check_combine_and_normalize ("path1", "/path2", "/path2"); |
290 |
check_combine_and_normalize ("/path1", "path2", "/path2"); |
291 |
check_combine_and_normalize ("/path1/file1/../u", "path2/x/../y/z/../a/b/..", "/path1/path2/y/a"); |
292 |
check_combine_and_normalize ("/path1/file1", "/path2//file2", "/path2/file2"); |
293 |
check_combine_and_normalize ("/path1/file1", "/..", "/"); |
294 |
check_combine_and_normalize ("/path1/file1", "../x", "/x"); |
295 |
check_combine_and_normalize ("/path1/file1", "../../../x", "/x"); |
296 |
check_combine_and_normalize ("/path1/file1", "/.x/..x/...x/x", "/.x/..x/...x/x"); |
297 |
|
298 |
return (0); |
299 |
} |
300 |
#endif |