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03b352a9 | 1 | /* Utility to update paths from internal to external forms. |
3ad4992f | 2 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
38475ee3 | 3 | Free Software Foundation, Inc. |
03b352a9 | 4 | |
f12b58b3 | 5 | This file is part of GCC. |
03b352a9 | 6 | |
f12b58b3 | 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 2 of the License, or (at | |
10 | your option) any later version. | |
03b352a9 | 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 COPYING. If not, write to the Free | |
19 | Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | /* This file contains routines to update a path, both to canonicalize | |
23 | the directory format and to handle any prefix translation. | |
24 | ||
25 | This file must be compiled with -DPREFIX= to specify the "prefix" | |
26 | value used by configure. If a filename does not begin with this | |
27 | prefix, it will not be affected other than by directory canonicalization. | |
28 | ||
29 | Each caller of 'update_path' may specify both a filename and | |
30 | a translation prefix and consist of the name of the package that contains | |
31 | the file ("@GCC", "@BINUTIL", "@GNU", etc). | |
32 | ||
33 | If the prefix is not specified, the filename will only undergo | |
34 | directory canonicalization. | |
35 | ||
36 | If it is specified, the string given by PREFIX will be replaced | |
37 | by the specified prefix (with a '@' in front unless the prefix begins | |
38 | with a '$') and further translation will be done as follows | |
39 | until none of the two conditions below are met: | |
40 | ||
41 | 1) If the filename begins with '@', the string between the '@' and | |
42 | the end of the name or the first '/' or directory separator will | |
43 | be considered a "key" and looked up as follows: | |
44 | ||
45 | -- If this is a Win32 OS, then the Registry will be examined for | |
195731ad | 46 | an entry of "key" in |
03b352a9 | 47 | |
778a2833 | 48 | HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY> |
03b352a9 | 49 | |
778a2833 | 50 | if found, that value will be used. <KEY> defaults to GCC version |
51 | string, but can be overridden at configuration time. | |
03b352a9 | 52 | |
53 | -- If not found (or not a Win32 OS), the environment variable | |
54 | key_ROOT (the value of "key" concatenated with the constant "_ROOT") | |
55 | is tried. If that fails, then PREFIX (see above) is used. | |
56 | ||
57 | 2) If the filename begins with a '$', the rest of the string up | |
58 | to the end or the first '/' or directory separator will be used | |
59 | as an environment variable, whose value will be returned. | |
60 | ||
61 | Once all this is done, any '/' will be converted to DIR_SEPARATOR, | |
195731ad | 62 | if they are different. |
03b352a9 | 63 | |
64 | NOTE: using resolve_keyed_path under Win32 requires linking with | |
65 | advapi32.dll. */ | |
66 | ||
67 | ||
68 | #include "config.h" | |
405711de | 69 | #include "system.h" |
805e22b2 | 70 | #include "coretypes.h" |
71 | #include "tm.h" | |
778a2833 | 72 | #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
03b352a9 | 73 | #include <windows.h> |
74 | #endif | |
7bcdc3c7 | 75 | #include "prefix.h" |
03b352a9 | 76 | |
7bcdc3c7 | 77 | static const char *std_prefix = PREFIX; |
055237ef | 78 | |
3ad4992f | 79 | static const char *get_key_value (char *); |
80 | static char *translate_name (char *); | |
81 | static char *save_string (const char *, int); | |
82 | static void tr (char *, int, int); | |
03b352a9 | 83 | |
778a2833 | 84 | #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
3ad4992f | 85 | static char *lookup_key (char *); |
03b352a9 | 86 | static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE; |
87 | #endif | |
88 | ||
03b352a9 | 89 | /* Given KEY, as above, return its value. */ |
90 | ||
7bcdc3c7 | 91 | static const char * |
3ad4992f | 92 | get_key_value (char *key) |
03b352a9 | 93 | { |
7bcdc3c7 | 94 | const char *prefix = 0; |
055237ef | 95 | char *temp = 0; |
03b352a9 | 96 | |
778a2833 | 97 | #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
03b352a9 | 98 | prefix = lookup_key (key); |
99 | #endif | |
100 | ||
101 | if (prefix == 0) | |
4e2023c8 | 102 | prefix = getenv (temp = concat (key, "_ROOT", NULL)); |
03b352a9 | 103 | |
104 | if (prefix == 0) | |
055237ef | 105 | prefix = std_prefix; |
106 | ||
107 | if (temp) | |
108 | free (temp); | |
03b352a9 | 109 | |
110 | return prefix; | |
111 | } | |
112 | ||
03b352a9 | 113 | /* Return a copy of a string that has been placed in the heap. */ |
114 | ||
115 | static char * | |
3ad4992f | 116 | save_string (const char *s, int len) |
03b352a9 | 117 | { |
19cb6b50 | 118 | char *result = xmalloc (len + 1); |
03b352a9 | 119 | |
b1b63592 | 120 | memcpy (result, s, len); |
03b352a9 | 121 | result[len] = 0; |
122 | return result; | |
123 | } | |
124 | ||
778a2833 | 125 | #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
03b352a9 | 126 | |
127 | /* Look up "key" in the registry, as above. */ | |
128 | ||
129 | static char * | |
3ad4992f | 130 | lookup_key (char *key) |
03b352a9 | 131 | { |
132 | char *dst; | |
133 | DWORD size; | |
134 | DWORD type; | |
135 | LONG res; | |
136 | ||
137 | if (reg_key == (HKEY) INVALID_HANDLE_VALUE) | |
138 | { | |
139 | res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0, | |
140 | KEY_READ, ®_key); | |
141 | ||
142 | if (res == ERROR_SUCCESS) | |
143 | res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0, | |
144 | KEY_READ, ®_key); | |
145 | ||
778a2833 | 146 | if (res == ERROR_SUCCESS) |
147 | res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0, | |
148 | KEY_READ, ®_key); | |
149 | ||
03b352a9 | 150 | if (res != ERROR_SUCCESS) |
195731ad | 151 | { |
152 | reg_key = (HKEY) INVALID_HANDLE_VALUE; | |
153 | return 0; | |
154 | } | |
03b352a9 | 155 | } |
156 | ||
157 | size = 32; | |
779740c5 | 158 | dst = (char *) xmalloc (size); |
03b352a9 | 159 | |
160 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); | |
161 | if (res == ERROR_MORE_DATA && type == REG_SZ) | |
162 | { | |
779740c5 | 163 | dst = (char *) xrealloc (dst, size); |
03b352a9 | 164 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); |
165 | } | |
166 | ||
167 | if (type != REG_SZ || res != ERROR_SUCCESS) | |
168 | { | |
169 | free (dst); | |
170 | dst = 0; | |
171 | } | |
172 | ||
173 | return dst; | |
174 | } | |
175 | #endif | |
176 | ||
17b80c08 | 177 | /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the |
178 | translation rules above and return a newly malloc-ed name. | |
179 | Otherwise, return the given name. */ | |
03b352a9 | 180 | |
17b80c08 | 181 | static char * |
3ad4992f | 182 | translate_name (char *name) |
03b352a9 | 183 | { |
17b80c08 | 184 | char code; |
185 | char *key, *old_name; | |
186 | const char *prefix; | |
03b352a9 | 187 | int keylen; |
188 | ||
17b80c08 | 189 | for (;;) |
190 | { | |
191 | code = name[0]; | |
192 | if (code != '@' && code != '$') | |
193 | break; | |
194 | ||
195 | for (keylen = 0; | |
196 | (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1])); | |
197 | keylen++) | |
198 | ; | |
199 | ||
200 | key = (char *) alloca (keylen + 1); | |
201 | strncpy (key, &name[1], keylen); | |
202 | key[keylen] = 0; | |
203 | ||
204 | if (code == '@') | |
205 | { | |
206 | prefix = get_key_value (key); | |
207 | if (prefix == 0) | |
208 | prefix = std_prefix; | |
209 | } | |
210 | else | |
211 | prefix = getenv (key); | |
03b352a9 | 212 | |
17b80c08 | 213 | if (prefix == 0) |
214 | prefix = PREFIX; | |
03b352a9 | 215 | |
17b80c08 | 216 | /* We used to strip trailing DIR_SEPARATORs here, but that can |
217 | sometimes yield a result with no separator when one was coded | |
218 | and intended by the user, causing two path components to run | |
219 | together. */ | |
03b352a9 | 220 | |
17b80c08 | 221 | old_name = name; |
222 | name = concat (prefix, &name[keylen + 1], NULL); | |
223 | free (old_name); | |
03b352a9 | 224 | } |
997d68fe | 225 | |
17b80c08 | 226 | return name; |
227 | } | |
03b352a9 | 228 | |
17b80c08 | 229 | /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */ |
230 | static void | |
3ad4992f | 231 | tr (char *string, int c1, int c2) |
17b80c08 | 232 | { |
233 | do | |
234 | { | |
235 | if (*string == c1) | |
236 | *string = c2; | |
237 | } | |
238 | while (*string++); | |
03b352a9 | 239 | } |
240 | ||
17b80c08 | 241 | /* Update PATH using KEY if PATH starts with PREFIX. The returned |
242 | string is always malloc-ed, and the caller is responsible for | |
243 | freeing it. */ | |
03b352a9 | 244 | |
17b80c08 | 245 | char * |
3ad4992f | 246 | update_path (const char *path, const char *key) |
03b352a9 | 247 | { |
38475ee3 | 248 | char *result, *p; |
17b80c08 | 249 | |
055237ef | 250 | if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0) |
03b352a9 | 251 | { |
17b80c08 | 252 | bool free_key = false; |
03b352a9 | 253 | |
17b80c08 | 254 | if (key[0] != '$') |
255 | { | |
256 | key = concat ("@", key, NULL); | |
257 | free_key = true; | |
258 | } | |
259 | ||
260 | result = concat (key, &path[strlen (std_prefix)], NULL); | |
261 | if (free_key) | |
262 | free ((char *) key); | |
263 | result = translate_name (result); | |
03b352a9 | 264 | } |
17b80c08 | 265 | else |
266 | result = xstrdup (path); | |
79b23a1e | 267 | |
38475ee3 | 268 | #ifndef ALWAYS_STRIP_DOTDOT |
269 | #define ALWAYS_STRIP_DOTDOT 0 | |
270 | #endif | |
271 | ||
272 | p = result; | |
273 | while (1) | |
274 | { | |
275 | char *src, *dest; | |
276 | ||
277 | p = strchr (p, '.'); | |
278 | if (p == NULL) | |
279 | break; | |
38475ee3 | 280 | /* Look for `/../' */ |
fa93416c | 281 | if (p[1] == '.' |
282 | && IS_DIR_SEPARATOR (p[2]) | |
283 | && (p != result && IS_DIR_SEPARATOR (p[-1]))) | |
38475ee3 | 284 | { |
285 | *p = 0; | |
286 | if (!ALWAYS_STRIP_DOTDOT && access (result, X_OK) == 0) | |
287 | { | |
288 | *p = '.'; | |
fa93416c | 289 | break; |
38475ee3 | 290 | } |
291 | else | |
292 | { | |
293 | /* We can't access the dir, so we won't be able to | |
fa93416c | 294 | access dir/.. either. Strip out `dir/../'. If `dir' |
295 | turns out to be `.', strip one more path component. */ | |
296 | dest = p; | |
297 | do | |
298 | { | |
299 | --dest; | |
300 | while (dest != result && IS_DIR_SEPARATOR (*dest)) | |
301 | --dest; | |
302 | while (dest != result && !IS_DIR_SEPARATOR (dest[-1])) | |
303 | --dest; | |
304 | } | |
305 | while (dest != result && *dest == '.'); | |
306 | /* If we have something like `./..' or `/..', don't | |
307 | strip anything more. */ | |
308 | if (*dest == '.' || IS_DIR_SEPARATOR (*dest)) | |
309 | { | |
310 | *p = '.'; | |
311 | break; | |
312 | } | |
38475ee3 | 313 | src = p + 3; |
314 | while (IS_DIR_SEPARATOR (*src)) | |
315 | ++src; | |
316 | p = dest; | |
317 | while ((*dest++ = *src++) != 0) | |
318 | ; | |
319 | } | |
320 | } | |
321 | else | |
322 | ++p; | |
323 | } | |
324 | ||
4e79af62 | 325 | #ifdef UPDATE_PATH_HOST_CANONICALIZE |
17b80c08 | 326 | /* Perform host dependent canonicalization when needed. */ |
38475ee3 | 327 | UPDATE_PATH_HOST_CANONICALIZE (result); |
4e79af62 | 328 | #endif |
329 | ||
79b23a1e | 330 | #ifdef DIR_SEPARATOR_2 |
aa40f561 | 331 | /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */ |
17b80c08 | 332 | if (DIR_SEPARATOR_2 != DIR_SEPARATOR) |
333 | tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR); | |
79b23a1e | 334 | #endif |
17b80c08 | 335 | |
79b23a1e | 336 | #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2) |
03b352a9 | 337 | if (DIR_SEPARATOR != '/') |
17b80c08 | 338 | tr (result, '/', DIR_SEPARATOR); |
03b352a9 | 339 | #endif |
340 | ||
17b80c08 | 341 | return result; |
03b352a9 | 342 | } |
055237ef | 343 | |
2358393e | 344 | /* Reset the standard prefix. */ |
055237ef | 345 | void |
3ad4992f | 346 | set_std_prefix (const char *prefix, int len) |
055237ef | 347 | { |
348 | std_prefix = save_string (prefix, len); | |
349 | } |