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
68 #include "gansidecl.h"
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 extern char *getenv ();
86 /* Given KEY, as above, return its value. */
95 prefix
= lookup_key (key
);
99 prefix
= getenv (concat (key
, "_ROOT", NULL_PTR
));
104 /* Concatenate a sequence of strings, returning the result.
106 This function is based on the one in libiberty. */
109 concat
VPROTO((char *first
, ...))
112 register char *newstr
;
116 #ifndef ANSI_PROTOTYPES
120 /* First compute the size of the result and get sufficient memory. */
122 VA_START (args
, first
);
123 #ifndef ANSI_PROTOTYPES
124 first
= va_arg (args
, char *);
132 length
+= strlen (arg
);
133 arg
= va_arg (args
, char *);
136 newstr
= (char *) malloc (length
+ 1);
139 /* Now copy the individual pieces to the result string. */
141 VA_START (args
, first
);
142 #ifndef ANSI_PROTOTYPES
143 first
= va_arg (args
, char *);
152 arg
= va_arg (args
, char *);
160 /* Return a copy of a string that has been placed in the heap. */
167 register char *result
= (char *) malloc (len
+ 1);
169 bcopy (s
, result
, len
);
176 /* Look up "key" in the registry, as above. */
187 if (reg_key
== (HKEY
) INVALID_HANDLE_VALUE
)
189 res
= RegOpenKeyExA (HKEY_LOCAL_MACHINE
, "SOFTWARE", 0,
192 if (res
== ERROR_SUCCESS
)
193 res
= RegOpenKeyExA (reg_key
, "Free Software Foundation", 0,
196 if (res
!= ERROR_SUCCESS
)
198 reg_key
= (HKEY
) INVALID_HANDLE_VALUE
;
204 dst
= (char *) malloc (size
);
206 res
= RegQueryValueExA (reg_key
, key
, 0, &type
, dst
, &size
);
207 if (res
== ERROR_MORE_DATA
&& type
== REG_SZ
)
209 dst
= (char *) realloc (dst
, size
);
210 res
= RegQueryValueExA (reg_key
, key
, 0, &type
, dst
, &size
);
213 if (type
!= REG_SZ
|| res
!= ERROR_SUCCESS
)
223 /* If NAME starts with a '@' or '$', apply the translation rules above
224 and return a new name. Otherwise, return the given name. */
227 translate_name (name
)
231 char *key
, *prefix
= 0;
234 if (code
!= '@' && code
!= '$')
238 (name
[keylen
+ 1] != 0 && name
[keylen
+ 1] != '/'
240 && name
[keylen
+ 1] != DIR_SEPARATOR
246 key
= alloca (keylen
+ 1);
247 strncpy (key
, &name
[1], keylen
);
250 name
= &name
[keylen
+ 1];
253 prefix
= get_key_value (key
);
255 prefix
= getenv (key
);
260 /* Remove any trailing directory separator from what we got. */
261 if (prefix
[strlen (prefix
) - 1] == '/'
263 || prefix
[strlen (prefix
) - 1] == DIR_SEPARATOR
267 prefix
= save_string (prefix
, strlen (prefix
));
268 prefix
[strlen (prefix
) - 1] = 0;
271 return concat (prefix
, name
, NULL_PTR
);
274 /* Update PATH using KEY if PATH starts with PREFIX. */
277 update_path (path
, key
)
281 if (! strncmp (path
, PREFIX
, strlen (PREFIX
)) && key
!= 0)
284 key
= concat ("@", key
, NULL_PTR
);
286 path
= concat (key
, &path
[strlen (PREFIX
)], NULL_PTR
);
288 while (path
[0] == '@' || path
[0] == '$')
289 path
= translate_name (path
);
293 if (DIR_SEPARATOR
!= '/')
296 int len
= strlen (path
);
298 path
= save_string (path
, len
);
299 for (i
= 0; i
< len
; i
++)
301 path
[i
] = DIR_SEPARATOR
;