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comparison gcc/prefix.c @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2007 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or (at
10 your option) any later version.
11
12 GCC 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 GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Library General Public
18 License along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 /* This file contains routines to update a path, both to canonicalize
22 the directory format and to handle any prefix translation.
23
24 This file must be compiled with -DPREFIX= to specify the "prefix"
25 value used by configure. If a filename does not begin with this
26 prefix, it will not be affected other than by directory canonicalization.
27
28 Each caller of 'update_path' may specify both a filename and
29 a translation prefix and consist of the name of the package that contains
30 the file ("@GCC", "@BINUTIL", "@GNU", etc).
31
32 If the prefix is not specified, the filename will only undergo
33 directory canonicalization.
34
35 If it is specified, the string given by PREFIX will be replaced
36 by the specified prefix (with a '@' in front unless the prefix begins
37 with a '$') and further translation will be done as follows
38 until none of the two conditions below are met:
39
40 1) If the filename begins with '@', the string between the '@' and
41 the end of the name or the first '/' or directory separator will
42 be considered a "key" and looked up as follows:
43
44 -- If this is a Win32 OS, then the Registry will be examined for
45 an entry of "key" in
46
47 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
48
49 if found, that value will be used. <KEY> defaults to GCC version
50 string, but can be overridden at configuration time.
51
52 -- If not found (or not a Win32 OS), the environment variable
53 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
54 is tried. If that fails, then PREFIX (see above) is used.
55
56 2) If the filename begins with a '$', the rest of the string up
57 to the end or the first '/' or directory separator will be used
58 as an environment variable, whose value will be returned.
59
60 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
61 if they are different.
62
63 NOTE: using resolve_keyed_path under Win32 requires linking with
64 advapi32.dll. */
65
66
67 #include "config.h"
68 #include "system.h"
69 #include "coretypes.h"
70 #include "tm.h"
71 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
72 #include <windows.h>
73 #endif
74 #include "prefix.h"
75
76 static const char *std_prefix = PREFIX;
77
78 static const char *get_key_value (char *);
79 static char *translate_name (char *);
80 static char *save_string (const char *, int);
81 static void tr (char *, int, int);
82
83 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
84 static char *lookup_key (char *);
85 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
86 #endif
87
88 /* Given KEY, as above, return its value. */
89
90 static const char *
91 get_key_value (char *key)
92 {
93 const char *prefix = 0;
94 char *temp = 0;
95
96 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
97 prefix = lookup_key (key);
98 #endif
99
100 if (prefix == 0)
101 prefix = getenv (temp = concat (key, "_ROOT", NULL));
102
103 if (prefix == 0)
104 prefix = std_prefix;
105
106 if (temp)
107 free (temp);
108
109 return prefix;
110 }
111
112 /* Return a copy of a string that has been placed in the heap. */
113
114 static char *
115 save_string (const char *s, int len)
116 {
117 char *result = XNEWVEC (char, len + 1);
118
119 memcpy (result, s, len);
120 result[len] = 0;
121 return result;
122 }
123
124 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
125
126 #ifndef WIN32_REGISTRY_KEY
127 # define WIN32_REGISTRY_KEY BASEVER
128 #endif
129
130 /* Look up "key" in the registry, as above. */
131
132 static char *
133 lookup_key (char *key)
134 {
135 char *dst;
136 DWORD size;
137 DWORD type;
138 LONG res;
139
140 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
141 {
142 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
143 KEY_READ, &reg_key);
144
145 if (res == ERROR_SUCCESS)
146 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
147 KEY_READ, &reg_key);
148
149 if (res == ERROR_SUCCESS)
150 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
151 KEY_READ, &reg_key);
152
153 if (res != ERROR_SUCCESS)
154 {
155 reg_key = (HKEY) INVALID_HANDLE_VALUE;
156 return 0;
157 }
158 }
159
160 size = 32;
161 dst = xmalloc (size);
162
163 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
164 if (res == ERROR_MORE_DATA && type == REG_SZ)
165 {
166 dst = xrealloc (dst, size);
167 res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size);
168 }
169
170 if (type != REG_SZ || res != ERROR_SUCCESS)
171 {
172 free (dst);
173 dst = 0;
174 }
175
176 return dst;
177 }
178 #endif
179
180 /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
181 translation rules above and return a newly malloc-ed name.
182 Otherwise, return the given name. */
183
184 static char *
185 translate_name (char *name)
186 {
187 char code;
188 char *key, *old_name;
189 const char *prefix;
190 int keylen;
191
192 for (;;)
193 {
194 code = name[0];
195 if (code != '@' && code != '$')
196 break;
197
198 for (keylen = 0;
199 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
200 keylen++)
201 ;
202
203 key = (char *) alloca (keylen + 1);
204 strncpy (key, &name[1], keylen);
205 key[keylen] = 0;
206
207 if (code == '@')
208 {
209 prefix = get_key_value (key);
210 if (prefix == 0)
211 prefix = std_prefix;
212 }
213 else
214 prefix = getenv (key);
215
216 if (prefix == 0)
217 prefix = PREFIX;
218
219 /* We used to strip trailing DIR_SEPARATORs here, but that can
220 sometimes yield a result with no separator when one was coded
221 and intended by the user, causing two path components to run
222 together. */
223
224 old_name = name;
225 name = concat (prefix, &name[keylen + 1], NULL);
226 free (old_name);
227 }
228
229 return name;
230 }
231
232 /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
233 static void
234 tr (char *string, int c1, int c2)
235 {
236 do
237 {
238 if (*string == c1)
239 *string = c2;
240 }
241 while (*string++);
242 }
243
244 /* Update PATH using KEY if PATH starts with PREFIX as a directory.
245 The returned string is always malloc-ed, and the caller is
246 responsible for freeing it. */
247
248 char *
249 update_path (const char *path, const char *key)
250 {
251 char *result, *p;
252 const int len = strlen (std_prefix);
253
254 if (! strncmp (path, std_prefix, len)
255 && (IS_DIR_SEPARATOR(path[len])
256 || path[len] == '\0')
257 && key != 0)
258 {
259 bool free_key = false;
260
261 if (key[0] != '$')
262 {
263 key = concat ("@", key, NULL);
264 free_key = true;
265 }
266
267 result = concat (key, &path[len], NULL);
268 if (free_key)
269 free (CONST_CAST (char *, key));
270 result = translate_name (result);
271 }
272 else
273 result = xstrdup (path);
274
275 #ifndef ALWAYS_STRIP_DOTDOT
276 #define ALWAYS_STRIP_DOTDOT 0
277 #endif
278
279 p = result;
280 while (1)
281 {
282 char *src, *dest;
283
284 p = strchr (p, '.');
285 if (p == NULL)
286 break;
287 /* Look for `/../' */
288 if (p[1] == '.'
289 && IS_DIR_SEPARATOR (p[2])
290 && (p != result && IS_DIR_SEPARATOR (p[-1])))
291 {
292 *p = 0;
293 if (!ALWAYS_STRIP_DOTDOT && access (result, X_OK) == 0)
294 {
295 *p = '.';
296 break;
297 }
298 else
299 {
300 /* We can't access the dir, so we won't be able to
301 access dir/.. either. Strip out `dir/../'. If `dir'
302 turns out to be `.', strip one more path component. */
303 dest = p;
304 do
305 {
306 --dest;
307 while (dest != result && IS_DIR_SEPARATOR (*dest))
308 --dest;
309 while (dest != result && !IS_DIR_SEPARATOR (dest[-1]))
310 --dest;
311 }
312 while (dest != result && *dest == '.');
313 /* If we have something like `./..' or `/..', don't
314 strip anything more. */
315 if (*dest == '.' || IS_DIR_SEPARATOR (*dest))
316 {
317 *p = '.';
318 break;
319 }
320 src = p + 3;
321 while (IS_DIR_SEPARATOR (*src))
322 ++src;
323 p = dest;
324 while ((*dest++ = *src++) != 0)
325 ;
326 }
327 }
328 else
329 ++p;
330 }
331
332 #ifdef UPDATE_PATH_HOST_CANONICALIZE
333 /* Perform host dependent canonicalization when needed. */
334 UPDATE_PATH_HOST_CANONICALIZE (result);
335 #endif
336
337 #ifdef DIR_SEPARATOR_2
338 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
339 if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
340 tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
341 #endif
342
343 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
344 if (DIR_SEPARATOR != '/')
345 tr (result, '/', DIR_SEPARATOR);
346 #endif
347
348 return result;
349 }
350
351 /* Reset the standard prefix. */
352 void
353 set_std_prefix (const char *prefix, int len)
354 {
355 std_prefix = save_string (prefix, len);
356 }