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4a5121b5 | 1 | /* Utility to update paths from internal to external forms. |
6ed4bb9a | 2 | Copyright (C) 1997, 1998 Free Software Foundation, Inc. |
4a5121b5 JL |
3 | |
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2 of the License, or (at your option) any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with GCC; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
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 '$') and further translation will be done as follows | |
38 | until none of the two conditions below are met: | |
39 | ||
40 | 1) If the filename begins with '@', the string between the '@' and | |
41 | the end of the name or the first '/' or directory separator will | |
42 | be considered a "key" and looked up as follows: | |
43 | ||
44 | -- If this is a Win32 OS, then the Registry will be examined for | |
45 | an entry of "key" in | |
46 | ||
47 | HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\ | |
48 | ||
49 | if found, that value will be used. | |
50 | ||
51 | -- If not found (or not a Win32 OS), the environment variable | |
52 | key_ROOT (the value of "key" concatenated with the constant "_ROOT") | |
53 | is tried. If that fails, then PREFIX (see above) is used. | |
54 | ||
55 | 2) If the filename begins with a '$', the rest of the string up | |
56 | to the end or the first '/' or directory separator will be used | |
57 | as an environment variable, whose value will be returned. | |
58 | ||
59 | Once all this is done, any '/' will be converted to DIR_SEPARATOR, | |
60 | if they are different. | |
61 | ||
62 | NOTE: using resolve_keyed_path under Win32 requires linking with | |
63 | advapi32.dll. */ | |
64 | ||
65 | ||
66 | #include "config.h" | |
670ee920 | 67 | #include "system.h" |
4a5121b5 JL |
68 | #ifdef _WIN32 |
69 | #include <windows.h> | |
70 | #endif | |
71 | ||
670ee920 KG |
72 | #include "gansidecl.h" |
73 | ||
6ed4bb9a MM |
74 | static char *std_prefix = PREFIX; |
75 | ||
4a5121b5 JL |
76 | static char *get_key_value PROTO((char *)); |
77 | static char *translate_name PROTO((char *)); | |
78 | static char *concat PVPROTO((char *, ...)); | |
79 | static char *save_string PROTO((char *, int)); | |
80 | ||
81 | #ifdef _WIN32 | |
82 | static char *lookup_key PROTO((char *)); | |
83 | static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE; | |
84 | #endif | |
85 | ||
4a5121b5 JL |
86 | /* Given KEY, as above, return its value. */ |
87 | ||
88 | static char * | |
89 | get_key_value (key) | |
90 | char *key; | |
91 | { | |
92 | char *prefix = 0; | |
6ed4bb9a | 93 | char *temp = 0; |
4a5121b5 JL |
94 | |
95 | #ifdef _WIN32 | |
96 | prefix = lookup_key (key); | |
97 | #endif | |
98 | ||
99 | if (prefix == 0) | |
6ed4bb9a | 100 | prefix = getenv (temp = concat (key, "_ROOT", NULL_PTR)); |
4a5121b5 JL |
101 | |
102 | if (prefix == 0) | |
6ed4bb9a MM |
103 | prefix = std_prefix; |
104 | ||
105 | if (temp) | |
106 | free (temp); | |
4a5121b5 JL |
107 | |
108 | return prefix; | |
109 | } | |
110 | ||
111 | /* Concatenate a sequence of strings, returning the result. | |
112 | ||
113 | This function is based on the one in libiberty. */ | |
114 | ||
115 | static char * | |
116 | concat VPROTO((char *first, ...)) | |
117 | { | |
118 | register int length; | |
119 | register char *newstr; | |
120 | register char *end; | |
121 | register char *arg; | |
122 | va_list args; | |
123 | #ifndef __STDC__ | |
124 | char *first; | |
125 | #endif | |
126 | ||
127 | /* First compute the size of the result and get sufficient memory. */ | |
128 | ||
129 | VA_START (args, first); | |
130 | #ifndef __STDC__ | |
131 | first = va_arg (args, char *); | |
132 | #endif | |
133 | ||
134 | arg = first; | |
135 | length = 0; | |
136 | ||
137 | while (arg != 0) | |
138 | { | |
139 | length += strlen (arg); | |
140 | arg = va_arg (args, char *); | |
141 | } | |
142 | ||
143 | newstr = (char *) malloc (length + 1); | |
144 | va_end (args); | |
145 | ||
146 | /* Now copy the individual pieces to the result string. */ | |
147 | ||
148 | VA_START (args, first); | |
149 | #ifndef __STDC__ | |
150 | first = va_arg (args, char *); | |
151 | #endif | |
152 | ||
153 | end = newstr; | |
154 | arg = first; | |
155 | while (arg != 0) | |
156 | { | |
157 | while (*arg) | |
158 | *end++ = *arg++; | |
159 | arg = va_arg (args, char *); | |
160 | } | |
161 | *end = '\000'; | |
162 | va_end (args); | |
163 | ||
164 | return (newstr); | |
165 | } | |
166 | ||
167 | /* Return a copy of a string that has been placed in the heap. */ | |
168 | ||
169 | static char * | |
170 | save_string (s, len) | |
171 | char *s; | |
172 | int len; | |
173 | { | |
174 | register char *result = (char *) malloc (len + 1); | |
175 | ||
176 | bcopy (s, result, len); | |
177 | result[len] = 0; | |
178 | return result; | |
179 | } | |
180 | ||
181 | #ifdef _WIN32 | |
182 | ||
183 | /* Look up "key" in the registry, as above. */ | |
184 | ||
185 | static char * | |
186 | lookup_key (key) | |
187 | char *key; | |
188 | { | |
189 | char *dst; | |
190 | DWORD size; | |
191 | DWORD type; | |
192 | LONG res; | |
193 | ||
194 | if (reg_key == (HKEY) INVALID_HANDLE_VALUE) | |
195 | { | |
196 | res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0, | |
197 | KEY_READ, ®_key); | |
198 | ||
199 | if (res == ERROR_SUCCESS) | |
200 | res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0, | |
201 | KEY_READ, ®_key); | |
202 | ||
203 | if (res != ERROR_SUCCESS) | |
204 | { | |
205 | reg_key = (HKEY) INVALID_HANDLE_VALUE; | |
206 | return 0; | |
207 | } | |
208 | } | |
209 | ||
210 | size = 32; | |
211 | dst = (char *) malloc (size); | |
212 | ||
213 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); | |
214 | if (res == ERROR_MORE_DATA && type == REG_SZ) | |
215 | { | |
216 | dst = (char *) realloc (dst, size); | |
217 | res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size); | |
218 | } | |
219 | ||
220 | if (type != REG_SZ || res != ERROR_SUCCESS) | |
221 | { | |
222 | free (dst); | |
223 | dst = 0; | |
224 | } | |
225 | ||
226 | return dst; | |
227 | } | |
228 | #endif | |
229 | ||
230 | /* If NAME starts with a '@' or '$', apply the translation rules above | |
231 | and return a new name. Otherwise, return the given name. */ | |
232 | ||
233 | static char * | |
234 | translate_name (name) | |
235 | char *name; | |
236 | { | |
237 | char code = name[0]; | |
e5e809f4 | 238 | char *key, *prefix = 0; |
4a5121b5 JL |
239 | int keylen; |
240 | ||
241 | if (code != '@' && code != '$') | |
242 | return name; | |
243 | ||
244 | for (keylen = 0; | |
245 | (name[keylen + 1] != 0 && name[keylen + 1] != '/' | |
246 | #ifdef DIR_SEPARATOR | |
247 | && name[keylen + 1] != DIR_SEPARATOR | |
248 | #endif | |
249 | ); | |
250 | keylen++) | |
251 | ; | |
252 | ||
804a4e13 | 253 | key = (char *) alloca (keylen + 1); |
4a5121b5 JL |
254 | strncpy (key, &name[1], keylen); |
255 | key[keylen] = 0; | |
256 | ||
257 | name = &name[keylen + 1]; | |
258 | ||
259 | if (code == '@') | |
260 | { | |
261 | prefix = get_key_value (key); | |
262 | if (prefix == 0) | |
6ed4bb9a | 263 | prefix = std_prefix; |
4a5121b5 JL |
264 | } |
265 | else | |
e5e809f4 JL |
266 | prefix = getenv (key); |
267 | ||
268 | if (prefix == 0) | |
269 | prefix = PREFIX; | |
4a5121b5 JL |
270 | |
271 | /* Remove any trailing directory separator from what we got. */ | |
272 | if (prefix[strlen (prefix) - 1] == '/' | |
273 | #ifdef DIR_SEPARATOR | |
274 | || prefix[strlen (prefix) - 1] == DIR_SEPARATOR | |
275 | #endif | |
276 | ) | |
277 | { | |
278 | prefix = save_string (prefix, strlen (prefix)); | |
279 | prefix[strlen (prefix) - 1] = 0; | |
280 | } | |
281 | ||
282 | return concat (prefix, name, NULL_PTR); | |
283 | } | |
284 | ||
285 | /* Update PATH using KEY if PATH starts with PREFIX. */ | |
286 | ||
287 | char * | |
288 | update_path (path, key) | |
289 | char *path; | |
290 | char *key; | |
291 | { | |
6ed4bb9a | 292 | if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0) |
4a5121b5 JL |
293 | { |
294 | if (key[0] != '$') | |
295 | key = concat ("@", key, NULL_PTR); | |
296 | ||
6ed4bb9a | 297 | path = concat (key, &path[strlen (std_prefix)], NULL_PTR); |
4a5121b5 JL |
298 | |
299 | while (path[0] == '@' || path[0] == '$') | |
300 | path = translate_name (path); | |
301 | } | |
302 | ||
303 | #ifdef DIR_SEPARATOR | |
304 | if (DIR_SEPARATOR != '/') | |
305 | { | |
306 | int i; | |
307 | int len = strlen (path); | |
308 | ||
309 | path = save_string (path, len); | |
310 | for (i = 0; i < len; i++) | |
311 | if (path[i] == '/') | |
312 | path[i] = DIR_SEPARATOR; | |
313 | } | |
314 | #endif | |
315 | ||
316 | return path; | |
317 | } | |
6ed4bb9a MM |
318 | |
319 | /* Reset the standard prefix */ | |
320 | void | |
321 | set_std_prefix (prefix, len) | |
322 | char *prefix; | |
323 | int len; | |
324 | { | |
325 | std_prefix = save_string (prefix, len); | |
326 | } |