301 lines
7.5 KiB
C
301 lines
7.5 KiB
C
/* Utility to update paths from internal to external forms.
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Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file contains routines to update a path, both to canonicalize
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the directory format and to handle any prefix translation.
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This file must be compiled with -DPREFIX= to specify the "prefix"
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value used by configure. If a filename does not begin with this
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prefix, it will not be affected other than by directory canonicalization.
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Each caller of 'update_path' may specify both a filename and
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a translation prefix and consist of the name of the package that contains
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the file ("@GCC", "@BINUTIL", "@GNU", etc).
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If the prefix is not specified, the filename will only undergo
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directory canonicalization.
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If it is specified, the string given by PREFIX will be replaced
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by the specified prefix (with a '@' in front unless the prefix begins
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with a '$') and further translation will be done as follows
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until none of the two conditions below are met:
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1) If the filename begins with '@', the string between the '@' and
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the end of the name or the first '/' or directory separator will
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be considered a "key" and looked up as follows:
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-- If this is a Win32 OS, then the Registry will be examined for
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an entry of "key" in
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HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<KEY>
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if found, that value will be used. <KEY> defaults to GCC version
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string, but can be overridden at configuration time.
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-- If not found (or not a Win32 OS), the environment variable
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key_ROOT (the value of "key" concatenated with the constant "_ROOT")
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is tried. If that fails, then PREFIX (see above) is used.
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2) If the filename begins with a '$', the rest of the string up
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to the end or the first '/' or directory separator will be used
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as an environment variable, whose value will be returned.
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Once all this is done, any '/' will be converted to DIR_SEPARATOR,
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if they are different.
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NOTE: using resolve_keyed_path under Win32 requires linking with
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advapi32.dll. */
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#include "config.h"
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#include "system.h"
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#if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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#include <windows.h>
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#endif
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#include "prefix.h"
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static const char *std_prefix = PREFIX;
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static const char *get_key_value PARAMS ((char *));
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static char *translate_name PARAMS ((char *));
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static char *save_string PARAMS ((const char *, int));
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static void tr PARAMS ((char *, int, int));
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#if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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static char *lookup_key PARAMS ((char *));
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static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
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#endif
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/* Given KEY, as above, return its value. */
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static const char *
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get_key_value (key)
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char *key;
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{
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const char *prefix = 0;
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char *temp = 0;
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#if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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prefix = lookup_key (key);
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#endif
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if (prefix == 0)
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prefix = getenv (temp = concat (key, "_ROOT", NULL));
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if (prefix == 0)
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prefix = std_prefix;
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if (temp)
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free (temp);
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return prefix;
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}
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/* Return a copy of a string that has been placed in the heap. */
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static char *
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save_string (s, len)
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const char *s;
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int len;
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{
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char *result = xmalloc (len + 1);
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memcpy (result, s, len);
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result[len] = 0;
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return result;
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}
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#if defined(_WIN32) && defined(ENABLE_WIN32_REGISTRY)
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/* Look up "key" in the registry, as above. */
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static char *
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lookup_key (key)
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char *key;
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{
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char *dst;
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DWORD size;
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DWORD type;
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LONG res;
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if (reg_key == (HKEY) INVALID_HANDLE_VALUE)
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{
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res = RegOpenKeyExA (HKEY_LOCAL_MACHINE, "SOFTWARE", 0,
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KEY_READ, ®_key);
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if (res == ERROR_SUCCESS)
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res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
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KEY_READ, ®_key);
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if (res == ERROR_SUCCESS)
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res = RegOpenKeyExA (reg_key, WIN32_REGISTRY_KEY, 0,
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KEY_READ, ®_key);
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if (res != ERROR_SUCCESS)
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{
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reg_key = (HKEY) INVALID_HANDLE_VALUE;
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return 0;
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}
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}
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size = 32;
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dst = (char *) xmalloc (size);
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res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
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if (res == ERROR_MORE_DATA && type == REG_SZ)
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{
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dst = (char *) xrealloc (dst, size);
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res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
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}
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if (type != REG_SZ || res != ERROR_SUCCESS)
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{
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free (dst);
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dst = 0;
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}
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return dst;
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}
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#endif
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/* If NAME, a malloc-ed string, starts with a '@' or '$', apply the
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translation rules above and return a newly malloc-ed name.
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Otherwise, return the given name. */
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static char *
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translate_name (name)
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char *name;
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{
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char code;
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char *key, *old_name;
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const char *prefix;
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int keylen;
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for (;;)
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{
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code = name[0];
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if (code != '@' && code != '$')
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break;
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for (keylen = 0;
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(name[keylen + 1] != 0 && !IS_DIR_SEPARATOR (name[keylen + 1]));
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keylen++)
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;
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key = (char *) alloca (keylen + 1);
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strncpy (key, &name[1], keylen);
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key[keylen] = 0;
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if (code == '@')
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{
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prefix = get_key_value (key);
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if (prefix == 0)
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prefix = std_prefix;
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}
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else
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prefix = getenv (key);
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if (prefix == 0)
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prefix = PREFIX;
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/* We used to strip trailing DIR_SEPARATORs here, but that can
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sometimes yield a result with no separator when one was coded
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and intended by the user, causing two path components to run
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together. */
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old_name = name;
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name = concat (prefix, &name[keylen + 1], NULL);
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free (old_name);
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}
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return name;
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}
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/* In a NUL-terminated STRING, replace character C1 with C2 in-place. */
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static void
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tr (string, c1, c2)
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char *string;
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int c1, c2;
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{
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do
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{
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if (*string == c1)
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*string = c2;
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}
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while (*string++);
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}
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/* Update PATH using KEY if PATH starts with PREFIX. The returned
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string is always malloc-ed, and the caller is responsible for
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freeing it. */
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char *
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update_path (path, key)
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const char *path;
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const char *key;
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{
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char *result;
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if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
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{
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bool free_key = false;
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if (key[0] != '$')
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{
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key = concat ("@", key, NULL);
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free_key = true;
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}
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result = concat (key, &path[strlen (std_prefix)], NULL);
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if (free_key)
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free ((char *) key);
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result = translate_name (result);
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}
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else
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result = xstrdup (path);
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#ifdef UPDATE_PATH_HOST_CANONICALIZE
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/* Perform host dependent canonicalization when needed. */
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UPDATE_PATH_HOST_CANONICALIZE (path);
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#endif
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#ifdef DIR_SEPARATOR_2
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/* Convert DIR_SEPARATOR_2 to DIR_SEPARATOR. */
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if (DIR_SEPARATOR_2 != DIR_SEPARATOR)
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tr (result, DIR_SEPARATOR_2, DIR_SEPARATOR);
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#endif
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#if defined (DIR_SEPARATOR) && !defined (DIR_SEPARATOR_2)
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if (DIR_SEPARATOR != '/')
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tr (result, '/', DIR_SEPARATOR);
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#endif
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return result;
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}
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/* Reset the standard prefix */
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void
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set_std_prefix (prefix, len)
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const char *prefix;
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int len;
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{
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std_prefix = save_string (prefix, len);
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}
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