| /* Utility to update paths from internal to external forms. |
| Copyright (C) 1997-2017 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Library General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or (at |
| your option) any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This file contains routines to update a path, both to canonicalize |
| the directory format and to handle any prefix translation. |
| |
| This file must be compiled with -DPREFIX= to specify the "prefix" |
| value used by configure. If a filename does not begin with this |
| prefix, it will not be affected other than by directory canonicalization. |
| |
| Each caller of 'update_path' may specify both a filename and |
| a translation prefix and consist of the name of the package that contains |
| the file ("@GCC", "@BINUTIL", "@GNU", etc). |
| |
| If the prefix is not specified, the filename will only undergo |
| directory canonicalization. |
| |
| If it is specified, the string given by PREFIX will be replaced |
| by the specified prefix (with a '@' in front unless the prefix begins |
| with a '$') and further translation will be done as follows |
| until none of the two conditions below are met: |
| |
| 1) If the filename begins with '@', the string between the '@' and |
| the end of the name or the first '/' or directory separator will |
| be considered a "key" and looked up as follows: |
| |
| -- If this is a Win32 OS, then the Registry will be examined for |
| an entry of "key" in |
| |
| HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY> |
| |
| if found, that value will be used. <KEY> defaults to GCC version |
| string, but can be overridden at configuration time. |
| |
| -- If not found (or not a Win32 OS), the environment variable |
| key_ROOT (the value of "key" concatenated with the constant "_ROOT") |
| is tried. If that fails, then PREFIX (see above) is used. |
| |
| 2) If the filename begins with a '$', the rest of the string up |
| to the end or the first '/' or directory separator will be used |
| as an environment variable, whose value will be returned. |
| |
| Once all this is done, any '/' will be converted to DIR_SEPARATOR, |
| if they are different. |
| |
| NOTE: using resolve_keyed_path under Win32 requires linking with |
| advapi32.dll. */ |
| |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
| #include <windows.h> |
| #endif |
| #include "prefix.h" |
| #include "common/common-target.h" |
| |
| static const char *std_prefix = PREFIX; |
| |
| static const char *get_key_value (char *); |
| static char *translate_name (char *); |
| static char *save_string (const char *, int); |
| static void tr (char *, int, int); |
| |
| #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
| static char *lookup_key (char *); |
| static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE; |
| #endif |
| |
| /* Given KEY, as above, return its value. */ |
| |
| static const char * |
| get_key_value (char *key) |
| { |
| const char *prefix = 0; |
| char *temp = 0; |
| |
| #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
| prefix = lookup_key (key); |
| #endif |
| |
| if (prefix == 0) |
| prefix = getenv (temp = concat (key, "_ROOT", NULL)); |
| |
| if (prefix == 0) |
| prefix = std_prefix; |
| |
| free (temp); |
| |
| return prefix; |
| } |
| |
| /* Return a copy of a string that has been placed in the heap. */ |
| |
| static char * |
| save_string (const char *s, int len) |
| { |
| char *result = XNEWVEC (char, len + 1); |
| |
| memcpy (result, s, len); |
| result[len] = 0; |
| return result; |
| } |
| |
| #if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY) |
| |
| #ifndef WIN32_REGISTRY_KEY |
| # define WIN32_REGISTRY_KEY BASEVER |
| #endif |
| |
| /* Look up "key" in the registry, as above. */ |
| |
| static char * |
| lookup_key (char *key) |
| { |
| char *dst; |
| DWORD size; |
| DWORD type; |
| LONG res; |
| |
| if (reg_key == (HKEY) INVALID_HANDLE_VALUE) |
| { |
| res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0, |
| KEY_READ, ®_key); |
| |
| if (res == ERROR_SUCCESS) |
| res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0, |
| KEY_READ, ®_key); |
| |
| if (res == ERROR_SUCCESS) |
| res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0, |
| KEY_READ, ®_key); |
| |
| if (res != ERROR_SUCCESS) |
| { |
| reg_key = (HKEY) INVALID_HANDLE_VALUE; |
| return 0; |
| } |
| } |
| |
| size = 32; |
| dst = XNEWVEC (char, size); |
| |
| res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size); |
| if (res == ERROR_MORE_DATA && type == REG_SZ) |
| { |
| dst = XRESIZEVEC (char, dst, size); |
| res = RegQueryValueExA (reg_key, key, 0, &type, (LPBYTE) dst, &size); |
| } |
| |
| if (type != REG_SZ || res != ERROR_SUCCESS) |
| { |
| free (dst); |
| dst = 0; |
| } |
| |
| return dst; |
| } |
| #endif |
| |
| /* If NAME, a malloc-ed string, starts with a '@' or '$', apply the |
| translation rules above and return a newly malloc-ed name. |
| Otherwise, return the given name. */ |
| |
| static char * |
| translate_name (char *name) |
| { |
| char code; |
| char *key, *old_name; |
| const char *prefix; |
| int keylen; |
| |
| for (;;) |
| { |
| code = name[0]; |
| if (code != '@' && code != '$') |
| break; |
| |
| for (keylen = 0; |
| (name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1])); |
| keylen++) |
| ; |
| |
| key = (char *) alloca (keylen + 1); |
| strncpy (key, &name[1], keylen); |
| key[keylen] = 0; |
| |
| if (code == '@') |
| { |
| prefix = get_key_value (key); |
| if (prefix == 0) |
| prefix = std_prefix; |
| } |
| else |
| prefix = getenv (key); |
| |
| if (prefix == 0) |
| prefix = PREFIX; |
| |
| /* We used to strip trailing DIR_SEPARATORs here, but that can |
| sometimes yield a result with no separator when one was coded |
| and intended by the user, causing two path components to run |
| together. */ |
| |
| old_name = name; |
| name = concat (prefix, &name[keylen + 1], NULL); |
| free (old_name); |
| } |
| |
| return name; |
| } |
| |
| /* In a NUL-terminated STRING, replace character C1 with C2 in-place. */ |
| static void |
| tr (char *string, int c1, int c2) |
| { |
| do |
| { |
| if (*string == c1) |
| *string = c2; |
| } |
| while (*string++); |
| } |
| |
| /* Update PATH using KEY if PATH starts with PREFIX as a directory. |
| The returned string is always malloc-ed, and the caller is |
| responsible for freeing it. */ |
| |
| char * |
| update_path (const char *path, const char *key) |
| { |
| char *result, *p; |
| const int len = strlen (std_prefix); |
| |
| if (! filename_ncmp (path, std_prefix, len) |
| && (IS_DIR_SEPARATOR (path[len]) |
| || path[len] == '\0') |
| && key != 0) |
| { |
| bool free_key = false; |
| |
| if (key[0] != '$') |
| { |
| key = concat ("@", key, NULL); |
| free_key = true; |
| } |
| |
| result = concat (key, &path[len], NULL); |
| if (free_key) |
| free (CONST_CAST (char *, key)); |
| result = translate_name (result); |
| } |
| else |
| result = xstrdup (path); |
| |
| p = result; |
| while (1) |
| { |
| char *src, *dest; |
| |
| p = strchr (p, '.'); |
| if (p == NULL) |
| break; |
| /* Look for `/../' */ |
| if (p[1] == '.' |
| && IS_DIR_SEPARATOR (p[2]) |
| && (p != result && IS_DIR_SEPARATOR (p[-1]))) |
| { |
| *p = 0; |
| if (!targetm_common.always_strip_dotdot |
| && access (result, X_OK) == 0) |
| { |
| *p = '.'; |
| break; |
| } |
| else |
| { |
| /* We can't access the dir, so we won't be able to |
| access dir/.. either. Strip out `dir/../'. If `dir' |
| turns out to be `.', strip one more path component. */ |
| dest = p; |
| do |
| { |
| --dest; |
| while (dest != result && IS_DIR_SEPARATOR (*dest)) |
| --dest; |
| while (dest != result && !IS_DIR_SEPARATOR (dest[-1])) |
| --dest; |
| } |
| while (dest != result && *dest == '.'); |
| /* If we have something like `./..' or `/..', don't |
| strip anything more. */ |
| if (*dest == '.' || IS_DIR_SEPARATOR (*dest)) |
| { |
| *p = '.'; |
| break; |
| } |
| src = p + 3; |
| while (IS_DIR_SEPARATOR (*src)) |
| ++src; |
| p = dest; |
| while ((*dest++ = *src++) != 0) |
| ; |
| } |
| } |
| else |
| ++p; |
| } |
| |
| #ifdef UPDATE_PATH_HOST_CANONICALIZE |
| /* Perform host dependent canonicalization when needed. */ |
| UPDATE_PATH_HOST_CANONICALIZE (result); |
| #endif |
| |
| #ifdef DIR_SEPARATOR_2 |
| /* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */ |
| if (DIR_SEPARATOR_2 != DIR_SEPARATOR) |
| tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR); |
| #endif |
| |
| #if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2) |
| if (DIR_SEPARATOR != '/') |
| tr (result, '/', DIR_SEPARATOR); |
| #endif |
| |
| return result; |
| } |
| |
| /* Reset the standard prefix. */ |
| void |
| set_std_prefix (const char *prefix, int len) |
| { |
| std_prefix = save_string (prefix, len); |
| } |