1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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.
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.
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. */
21 /* This file contains routines to update a path, both to canonicalize
22 the directory format and to handle any prefix translation.
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.
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).
32 If the prefix is not specified, the filename will only undergo
33 directory canonicalization.
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 '$') and further translation will be done as follows
38 until none of the two conditions below are met:
40 1) If the filename begins with '@', the string between the '@' and
41 the end of the name or the first '/' or directory separator will
42 be considered a "key" and looked up as follows:
44 -- If this is a Win32 OS, then the Registry will be examined for
47 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
49 if found, that value will be used. <KEY> defaults to GCC version
50 string, but can be overridden at configuration time.
52 -- If not found (or not a Win32 OS), the environment variable
53 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
54 is tried. If that fails, then PREFIX (see above) is used.
56 2) If the filename begins with a '$', 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.
60 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
61 if they are different.
63 NOTE: using resolve_keyed_path under Win32 requires linking with
69 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
74 static const char *std_prefix = PREFIX;
76 static const char *get_key_value PARAMS ((char *));
77 static const char *translate_name PARAMS ((const char *));
78 static char *save_string PARAMS ((const char *, int));
79 char *concat VPARAMS ((const char *first, ...));
81 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
82 static char *lookup_key PARAMS ((char *));
83 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
86 /* Given KEY, as above, return its value. */
92 const char *prefix = 0;
95 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
96 prefix = lookup_key (key);
100 prefix = getenv (temp = concat (key, "_ROOT", NULL));
111 /* Concatenate a sequence of strings, returning the result.
113 This function is based on the one in libiberty. */
116 concat VPARAMS ((const char *first, ...))
119 register char *newstr;
121 register const char *arg;
123 #ifndef ANSI_PROTOTYPES
127 /* First compute the size of the result and get sufficient memory. */
129 VA_START (args, first);
130 #ifndef ANSI_PROTOTYPES
131 first = va_arg (args, const char *);
139 length += strlen (arg);
140 arg = va_arg (args, const char *);
143 newstr = (char *) xmalloc (length + 1);
146 /* Now copy the individual pieces to the result string. */
148 VA_START (args, first);
149 #ifndef ANSI_PROTOTYPES
150 first = va_arg (args, char *);
159 arg = va_arg (args, const char *);
167 /* Return a copy of a string that has been placed in the heap. */
174 register char *result = xmalloc (len + 1);
176 memcpy (result, s, len);
181 #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
183 /* Look up "key" in the registry, as above. */
194 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
196 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
199 if (res == ERROR_SUCCESS)
200 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
203 if (res == ERROR_SUCCESS)
204 res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
207 if (res != ERROR_SUCCESS)
209 reg_key = (HKEY) INVALID_HANDLE_VALUE;
215 dst = (char *) xmalloc (size);
217 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
218 if (res == ERROR_MORE_DATA && type == REG_SZ)
220 dst = (char *) xrealloc (dst, size);
221 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
224 if (type != REG_SZ || res != ERROR_SUCCESS)
234 /* If NAME starts with a '@' or '$', apply the translation rules above
235 and return a new name. Otherwise, return the given name. */
238 translate_name (name)
243 const char *prefix = 0;
246 if (code != '@' && code != '$')
250 (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
254 key = (char *) alloca (keylen + 1);
255 strncpy (key, &name[1], keylen);
258 name = &name[keylen + 1];
262 prefix = get_key_value (key);
267 prefix = getenv (key);
272 /* We used to strip trailing DIR_SEPARATORs here, but that can
273 sometimes yield a result with no separator when one was coded
274 and intended by the user, causing two path components to run
277 return concat (prefix, name, NULL);
280 /* Update PATH using KEY if PATH starts with PREFIX. */
283 update_path (path, key)
287 if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
290 key = concat ("@", key, NULL);
292 path = concat (key, &path[strlen (std_prefix)], NULL);
294 while (path[0] == '@' || path[0] == '$')
295 path = translate_name (path);
298 #ifdef UPDATE_PATH_HOST_CANONICALIZE
299 /* Perform host dependant canonicalization when needed. */
300 UPDATE_PATH_HOST_CANONICALIZE (path, key);
303 #ifdef DIR_SEPARATOR_2
304 /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
305 if (DIR_SEPARATOR != DIR_SEPARATOR_2)
307 char *new_path = xstrdup (path);
310 if (*new_path == DIR_SEPARATOR_2)
311 *new_path = DIR_SEPARATOR;
312 } while (*new_path++);
316 #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
317 if (DIR_SEPARATOR != '/')
319 char *new_path = xstrdup (path);
322 if (*new_path == '/')
323 *new_path = DIR_SEPARATOR;
324 } while (*new_path++);
331 /* Reset the standard prefix */
333 set_std_prefix (prefix, len)
337 std_prefix = save_string (prefix, len);