* config/arm/elf.h (ASM_OUTPUT_ALIGNED_COMMON): Remove definition.
[official-gcc.git] / gcc / prefix.c
blobe2f8a6714daf676ed7420e42fabd3b33d711cbf4
1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GCC.
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.
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.
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. */
22 /* This file contains routines to update a path, both to canonicalize
23 the directory format and to handle any prefix translation.
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.
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).
33 If the prefix is not specified, the filename will only undergo
34 directory canonicalization.
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 '$') and further translation will be done as follows
39 until none of the two conditions below are met:
41 1) If the filename begins with '@', the string between the '@' and
42 the end of the name or the first '/' or directory separator will
43 be considered a "key" and looked up as follows:
45 -- If this is a Win32 OS, then the Registry will be examined for
46 an entry of "key" in
48 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
50 if found, that value will be used. <KEY> defaults to GCC version
51 string, but can be overridden at configuration time.
53 -- If not found (or not a Win32 OS), the environment variable
54 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
55 is tried. If that fails, then PREFIX (see above) is used.
57 2) If the filename begins with a '$', 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.
61 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
62 if they are different.
64 NOTE: using resolve_keyed_path under Win32 requires linking with
65 advapi32.dll. */
68 #include "config.h"
69 #include "system.h"
70 #include "coretypes.h"
71 #include "tm.h"
72 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
73 #include <windows.h>
74 #endif
75 #include "prefix.h"
77 static const char *std_prefix = PREFIX;
79 static const char *get_key_value PARAMS ((char *));
80 static char *translate_name PARAMS ((char *));
81 static char *save_string PARAMS ((const char *, int));
82 static void tr PARAMS ((char *, int, int));
84 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
85 static char *lookup_key PARAMS ((char *));
86 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
87 #endif
89 /* Given KEY, as above, return its value. */
91 static const char *
92 get_key_value (key)
93 char *key;
95 const char *prefix = 0;
96 char *temp = 0;
98 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
99 prefix = lookup_key (key);
100 #endif
102 if (prefix == 0)
103 prefix = getenv (temp = concat (key, "_ROOT", NULL));
105 if (prefix == 0)
106 prefix = std_prefix;
108 if (temp)
109 free (temp);
111 return prefix;
114 /* Return a copy of a string that has been placed in the heap. */
116 static char *
117 save_string (s, len)
118 const char *s;
119 int len;
121 char *result = xmalloc (len + 1);
123 memcpy (result, s, len);
124 result[len] = 0;
125 return result;
128 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
130 /* Look up "key" in the registry, as above. */
132 static char *
133 lookup_key (key)
134 char *key;
136 char *dst;
137 DWORD size;
138 DWORD type;
139 LONG res;
141 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
143 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
144 KEY_READ, &reg_key);
146 if (res == ERROR_SUCCESS)
147 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
148 KEY_READ, &reg_key);
150 if (res == ERROR_SUCCESS)
151 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
152 KEY_READ, &reg_key);
154 if (res != ERROR_SUCCESS)
156 reg_key = (HKEY) INVALID_HANDLE_VALUE;
157 return 0;
161 size = 32;
162 dst = (char *) xmalloc (size);
164 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
165 if (res == ERROR_MORE_DATA && type == REG_SZ)
167 dst = (char *) xrealloc (dst, size);
168 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
171 if (type != REG_SZ || res != ERROR_SUCCESS)
173 free (dst);
174 dst = 0;
177 return dst;
179 #endif
181 /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
182 translation rules above and return a newly malloc-ed name.
183 Otherwise, return the given name. */
185 static char *
186 translate_name (name)
187 char *name;
189 char code;
190 char *key, *old_name;
191 const char *prefix;
192 int keylen;
194 for (;;)
196 code = name[0];
197 if (code != '@' && code != '$')
198 break;
200 for (keylen = 0;
201 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
202 keylen++)
205 key = (char *) alloca (keylen + 1);
206 strncpy (key, &name[1], keylen);
207 key[keylen] = 0;
209 if (code == '@')
211 prefix = get_key_value (key);
212 if (prefix == 0)
213 prefix = std_prefix;
215 else
216 prefix = getenv (key);
218 if (prefix == 0)
219 prefix = PREFIX;
221 /* We used to strip trailing DIR_SEPARATORs here, but that can
222 sometimes yield a result with no separator when one was coded
223 and intended by the user, causing two path components to run
224 together. */
226 old_name = name;
227 name = concat (prefix, &name[keylen + 1], NULL);
228 free (old_name);
231 return name;
234 /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
235 static void
236 tr (string, c1, c2)
237 char *string;
238 int c1, c2;
242 if (*string == c1)
243 *string = c2;
245 while (*string++);
248 /* Update PATH using KEY if PATH starts with PREFIX. The returned
249 string is always malloc-ed, and the caller is responsible for
250 freeing it. */
252 char *
253 update_path (path, key)
254 const char *path;
255 const char *key;
257 char *result, *p;
259 if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
261 bool free_key = false;
263 if (key[0] != '$')
265 key = concat ("@", key, NULL);
266 free_key = true;
269 result = concat (key, &path[strlen (std_prefix)], NULL);
270 if (free_key)
271 free ((char *) key);
272 result = translate_name (result);
274 else
275 result = xstrdup (path);
277 #ifndef ALWAYS_STRIP_DOTDOT
278 #define ALWAYS_STRIP_DOTDOT 0
279 #endif
281 p = result;
282 while (1)
284 char *src, *dest;
286 p = strchr (p, '.');
287 if (p == NULL)
288 break;
289 /* Look for `/../' */
290 if (p[1] == '.'
291 && IS_DIR_SEPARATOR (p[2])
292 && (p != result && IS_DIR_SEPARATOR (p[-1])))
294 *p = 0;
295 if (!ALWAYS_STRIP_DOTDOT && access (result, X_OK) == 0)
297 *p = '.';
298 break;
300 else
302 /* We can't access the dir, so we won't be able to
303 access dir/.. either. Strip out `dir/../'. If `dir'
304 turns out to be `.', strip one more path component. */
305 dest = p;
308 --dest;
309 while (dest != result && IS_DIR_SEPARATOR (*dest))
310 --dest;
311 while (dest != result && !IS_DIR_SEPARATOR (dest[-1]))
312 --dest;
314 while (dest != result && *dest == '.');
315 /* If we have something like `./..' or `/..', don't
316 strip anything more. */
317 if (*dest == '.' || IS_DIR_SEPARATOR (*dest))
319 *p = '.';
320 break;
322 src = p + 3;
323 while (IS_DIR_SEPARATOR (*src))
324 ++src;
325 p = dest;
326 while ((*dest++ = *src++) != 0)
330 else
331 ++p;
334 #ifdef UPDATE_PATH_HOST_CANONICALIZE
335 /* Perform host dependent canonicalization when needed. */
336 UPDATE_PATH_HOST_CANONICALIZE (result);
337 #endif
339 #ifdef DIR_SEPARATOR_2
340 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
341 if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
342 tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
343 #endif
345 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
346 if (DIR_SEPARATOR != '/')
347 tr (result, '/', DIR_SEPARATOR);
348 #endif
350 return result;
353 /* Reset the standard prefix */
354 void
355 set_std_prefix (prefix, len)
356 const char *prefix;
357 int len;
359 std_prefix = save_string (prefix, len);