1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997, 1998 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 '$') and further translation will be done as follows
38 until none of the two conditions below are met:
40 1) If the filename begins with '@', the string between the '@' and
41 the end of the name or the first '/' or directory separator will
42 be considered a "key" and looked up as follows:
44 -- If this is a Win32 OS, then the Registry will be examined for
47 HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\
49 if found, that value will be used.
51 -- If not found (or not a Win32 OS), the environment variable
52 key_ROOT (the value of "key" concatenated with the constant "_ROOT")
53 is tried. If that fails, then PREFIX (see above) is used.
55 2) If the filename begins with a '$', 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.
59 Once all this is done, any '/' will be converted to DIR_SEPARATOR,
60 if they are different.
62 NOTE: using resolve_keyed_path under Win32 requires linking with
72 static char *std_prefix = PREFIX;
74 static char *get_key_value PROTO((char *));
75 static char *translate_name PROTO((char *));
76 static char *concat PVPROTO((char *, ...));
77 static char *save_string PROTO((char *, int));
80 static char *lookup_key PROTO((char *));
81 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
84 /* Given KEY, as above, return its value. */
94 prefix = lookup_key (key);
98 prefix = getenv (temp = concat (key, "_ROOT", NULL_PTR));
109 /* Concatenate a sequence of strings, returning the result.
111 This function is based on the one in libiberty. */
114 concat VPROTO((char *first, ...))
117 register char *newstr;
125 /* First compute the size of the result and get sufficient memory. */
127 VA_START (args, first);
129 first = va_arg (args, char *);
137 length += strlen (arg);
138 arg = va_arg (args, char *);
141 newstr = (char *) malloc (length + 1);
144 /* Now copy the individual pieces to the result string. */
146 VA_START (args, first);
148 first = va_arg (args, char *);
157 arg = va_arg (args, char *);
165 /* Return a copy of a string that has been placed in the heap. */
172 register char *result = (char *) malloc (len + 1);
174 bcopy (s, result, len);
181 /* Look up "key" in the registry, as above. */
192 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
194 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
197 if (res == ERROR_SUCCESS)
198 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
201 if (res != ERROR_SUCCESS)
203 reg_key = (HKEY) INVALID_HANDLE_VALUE;
209 dst = (char *) malloc (size);
211 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
212 if (res == ERROR_MORE_DATA && type == REG_SZ)
214 dst = (char *) realloc (dst, size);
215 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
218 if (type != REG_SZ || res != ERROR_SUCCESS)
228 /* If NAME starts with a '@' or '$', apply the translation rules above
229 and return a new name. Otherwise, return the given name. */
232 translate_name (name)
236 char *key, *prefix = 0;
239 if (code != '@' && code != '$')
243 (name[keylen + 1] != 0 && name[keylen + 1] != '/'
245 && name[keylen + 1] != DIR_SEPARATOR
251 key = (char *) alloca (keylen + 1);
252 strncpy (key, &name[1], keylen);
255 name = &name[keylen + 1];
259 prefix = get_key_value (key);
264 prefix = getenv (key);
269 /* Remove any trailing directory separator from what we got. */
270 if (prefix[strlen (prefix) - 1] == '/'
272 || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
276 prefix = save_string (prefix, strlen (prefix));
277 prefix[strlen (prefix) - 1] = 0;
280 return concat (prefix, name, NULL_PTR);
283 /* Update PATH using KEY if PATH starts with PREFIX. */
286 update_path (path, key)
290 if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
293 key = concat ("@", key, NULL_PTR);
295 path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
297 while (path[0] == '@' || path[0] == '$')
298 path = translate_name (path);
302 if (DIR_SEPARATOR != '/')
305 int len = strlen (path);
307 path = save_string (path, len);
308 for (i = 0; i < len; i++)
310 path[i] = DIR_SEPARATOR;
317 /* Reset the standard prefix */
319 set_std_prefix (prefix, len)
323 std_prefix = save_string (prefix, len);