1 /* Utility to update paths from internal to external forms.
2 Copyright (C) 1997 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
67 #include "gansidecl.h"
90 static char *get_key_value PROTO((char *));
91 static char *translate_name PROTO((char *));
92 static char *concat PVPROTO((char *, ...));
93 static char *save_string PROTO((char *, int));
96 static char *lookup_key PROTO((char *));
97 static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
100 extern char *getenv ();
102 /* Given KEY, as above, return its value. */
111 prefix = lookup_key (key);
115 prefix = getenv (concat (key, "_ROOT", NULL_PTR));
123 /* Concatenate a sequence of strings, returning the result.
125 This function is based on the one in libiberty. */
128 concat VPROTO((char *first, ...))
131 register char *newstr;
139 /* First compute the size of the result and get sufficient memory. */
141 VA_START (args, first);
143 first = va_arg (args, char *);
151 length += strlen (arg);
152 arg = va_arg (args, char *);
155 newstr = (char *) malloc (length + 1);
158 /* Now copy the individual pieces to the result string. */
160 VA_START (args, first);
162 first = va_arg (args, char *);
171 arg = va_arg (args, char *);
179 /* Return a copy of a string that has been placed in the heap. */
186 register char *result = (char *) malloc (len + 1);
188 bcopy (s, result, len);
195 /* Look up "key" in the registry, as above. */
206 if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
208 res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
211 if (res == ERROR_SUCCESS)
212 res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
215 if (res != ERROR_SUCCESS)
217 reg_key = (HKEY) INVALID_HANDLE_VALUE;
223 dst = (char *) malloc (size);
225 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
226 if (res == ERROR_MORE_DATA && type == REG_SZ)
228 dst = (char *) realloc (dst, size);
229 res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
232 if (type != REG_SZ || res != ERROR_SUCCESS)
242 /* If NAME starts with a '@' or '$', apply the translation rules above
243 and return a new name. Otherwise, return the given name. */
246 translate_name (name)
253 if (code != '@' && code != '$')
257 (name[keylen + 1] != 0 && name[keylen + 1] != '/'
259 && name[keylen + 1] != DIR_SEPARATOR
265 key = alloca (keylen + 1);
266 strncpy (key, &name[1], keylen);
269 name = &name[keylen + 1];
273 prefix = get_key_value (key);
279 prefix = getenv (key);
281 prefix = concat ("$", key, NULL_PTR);
284 /* Remove any trailing directory separator from what we got. */
285 if (prefix[strlen (prefix) - 1] == '/'
287 || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
291 prefix = save_string (prefix, strlen (prefix));
292 prefix[strlen (prefix) - 1] = 0;
295 return concat (prefix, name, NULL_PTR);
298 /* Update PATH using KEY if PATH starts with PREFIX. */
301 update_path (path, key)
305 if (! strncmp (path, PREFIX, strlen (PREFIX)) && key != 0)
308 key = concat ("@", key, NULL_PTR);
310 path = concat (key, &path[strlen (PREFIX)], NULL_PTR);
312 while (path[0] == '@' || path[0] == '$')
313 path = translate_name (path);
317 if (DIR_SEPARATOR != '/')
320 int len = strlen (path);
322 path = save_string (path, len);
323 for (i = 0; i < len; i++)
325 path[i] = DIR_SEPARATOR;