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
77 #include "gansidecl.h"
79 static char *std_prefix = PREFIX;
81 static char *get_key_value PROTO((char *));
82 static char *translate_name PROTO((char *));
83 static char *concat PVPROTO((char *, ...));
84 static char *save_string PROTO((char *, int));
87 static char *lookup_key PROTO((char *));
88 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
91 /* Given KEY, as above, return its value. */
101 prefix = lookup_key (key);
105 prefix = getenv (temp = concat (key, "_ROOT", NULL_PTR));
116 /* Concatenate a sequence of strings, returning the result.
118 This function is based on the one in libiberty. */
121 concat VPROTO((char *first, ...))
124 register char *newstr;
132 /* First compute the size of the result and get sufficient memory. */
134 VA_START (args, first);
136 first = va_arg (args, char *);
144 length += strlen (arg);
145 arg = va_arg (args, char *);
148 newstr = (char *) malloc (length + 1);
151 /* Now copy the individual pieces to the result string. */
153 VA_START (args, first);
155 first = va_arg (args, char *);
164 arg = va_arg (args, char *);
172 /* Return a copy of a string that has been placed in the heap. */
179 register char *result = (char *) malloc (len + 1);
181 bcopy (s, result, len);
188 /* Look up "key" in the registry, as above. */
199 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
201 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
204 if (res == ERROR_SUCCESS)
205 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
208 if (res != ERROR_SUCCESS)
210 reg_key = (HKEY) INVALID_HANDLE_VALUE;
216 dst = (char *) malloc (size);
218 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
219 if (res == ERROR_MORE_DATA && type == REG_SZ)
221 dst = (char *) realloc (dst, size);
222 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
225 if (type != REG_SZ || res != ERROR_SUCCESS)
235 /* If NAME starts with a '@' or '$', apply the translation rules above
236 and return a new name. Otherwise, return the given name. */
239 translate_name (name)
243 char *key, *prefix = 0;
246 if (code != '@' && code != '$')
250 (name[keylen + 1] != 0 && name[keylen + 1] != '/'
252 && name[keylen + 1] != DIR_SEPARATOR
258 key = alloca (keylen + 1);
259 strncpy (key, &name[1], keylen);
262 name = &name[keylen + 1];
266 prefix = get_key_value (key);
271 prefix = getenv (key);
276 /* Remove any trailing directory separator from what we got. */
277 if (prefix[strlen (prefix) - 1] == '/'
279 || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
283 prefix = save_string (prefix, strlen (prefix));
284 prefix[strlen (prefix) - 1] = 0;
287 return concat (prefix, name, NULL_PTR);
290 /* Update PATH using KEY if PATH starts with PREFIX. */
293 update_path (path, key)
297 if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
300 key = concat ("@", key, NULL_PTR);
302 path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
304 while (path[0] == '@' || path[0] == '$')
305 path = translate_name (path);
309 if (DIR_SEPARATOR != '/')
312 int len = strlen (path);
314 path = save_string (path, len);
315 for (i = 0; i < len; i++)
317 path[i] = DIR_SEPARATOR;
324 /* Reset the standard prefix */
326 set_std_prefix (prefix, len)
330 std_prefix = save_string (prefix, len);