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
73 static const char *std_prefix = PREFIX;
75 static const char *get_key_value PROTO((char *));
76 static const char *translate_name PROTO((const char *));
77 static char *save_string PROTO((const 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. */
90 const char *prefix = 0;
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((const char *first, ...))
117 register char *newstr;
119 register const char *arg;
121 #ifndef ANSI_PROTOTYPES
125 /* First compute the size of the result and get sufficient memory. */
127 VA_START (args, first);
128 #ifndef ANSI_PROTOTYPES
129 first = va_arg (args, const char *);
137 length += strlen (arg);
138 arg = va_arg (args, const char *);
141 newstr = (char *) malloc (length + 1);
144 /* Now copy the individual pieces to the result string. */
146 VA_START (args, first);
147 #ifndef ANSI_PROTOTYPES
148 first = va_arg (args, char *);
157 arg = va_arg (args, const char *);
165 /* Return a copy of a string that has been placed in the heap. */
172 register char *result = xmalloc (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 '$', apply the translation rules above
229 and return a new name. Otherwise, return the given name. */
232 translate_name (name)
237 const char *prefix = 0;
240 if (code != '@' && code != '$')
244 (name[keylen + 1] != 0 && name[keylen + 1] != '/'
246 && name[keylen + 1] != DIR_SEPARATOR
252 key = (char *) alloca (keylen + 1);
253 strncpy (key, &name[1], keylen);
256 name = &name[keylen + 1];
260 prefix = get_key_value (key);
265 prefix = getenv (key);
270 /* Remove any trailing directory separator from what we got. */
271 if (prefix[strlen (prefix) - 1] == '/'
273 || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
277 char * temp = save_string (prefix, strlen (prefix));
278 temp[strlen (temp) - 1] = 0;
282 return concat (prefix, name, NULL_PTR);
285 /* Update PATH using KEY if PATH starts with PREFIX. */
288 update_path (path, key)
292 if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
295 key = concat ("@", key, NULL_PTR);
297 path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
299 while (path[0] == '@' || path[0] == '$')
300 path = translate_name (path);
304 if (DIR_SEPARATOR != '/')
307 int len = strlen (path);
309 path = save_string (path, len);
310 for (i = 0; i < len; i++)
312 path[i] = DIR_SEPARATOR;
319 /* Reset the standard prefix */
321 set_std_prefix (prefix, len)
325 std_prefix = save_string (prefix, len);