346 lines
8.3 KiB
C
346 lines
8.3 KiB
C
/* Utility to update paths from internal to external forms.
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Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at 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 '$') and further translation will be done as follows
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until none of the two conditions below are met:
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1) If the filename begins with '@', the string between the '@' and
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the end of the name or the first '/' or directory separator will
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be considered a "key" and looked up as follows:
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-- If this is a Win32 OS, then the Registry will be examined for
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an entry of "key" in
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HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\
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if found, that value will be used.
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-- If not found (or not a Win32 OS), the environment variable
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key_ROOT (the value of "key" concatenated with the constant "_ROOT")
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is tried. If that fails, then PREFIX (see above) is used.
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2) If the filename begins with a '$', 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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#ifdef _WIN32
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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 PROTO((char *));
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static const char *translate_name PROTO((const char *));
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static char *save_string PROTO((const char *, int));
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#ifdef _WIN32
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static char *lookup_key PROTO((char *));
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static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
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#endif
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#ifndef DIR_SEPARATOR
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# define IS_DIR_SEPARATOR(ch) ((ch) == '/')
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#else /* DIR_SEPARATOR */
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# ifndef DIR_SEPARATOR_2
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# define IS_DIR_SEPARATOR(ch) ((ch) == DIR_SEPARATOR)
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# else /* DIR_SEPARATOR && DIR_SEPARATOR_2 */
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# define IS_DIR_SEPARATOR(ch) \
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(((ch) == DIR_SEPARATOR) || ((ch) == DIR_SEPARATOR_2))
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# endif /* DIR_SEPARATOR && DIR_SEPARATOR_2 */
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#endif /* DIR_SEPARATOR */
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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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#ifdef _WIN32
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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_PTR));
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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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/* Concatenate a sequence of strings, returning the result.
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This function is based on the one in libiberty. */
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char *
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concat VPROTO((const char *first, ...))
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{
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register int length;
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register char *newstr;
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register char *end;
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register const char *arg;
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va_list args;
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#ifndef ANSI_PROTOTYPES
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const char *first;
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#endif
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/* First compute the size of the result and get sufficient memory. */
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VA_START (args, first);
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#ifndef ANSI_PROTOTYPES
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first = va_arg (args, const char *);
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#endif
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arg = first;
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length = 0;
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while (arg != 0)
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{
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length += strlen (arg);
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arg = va_arg (args, const char *);
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}
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newstr = (char *) malloc (length + 1);
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va_end (args);
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/* Now copy the individual pieces to the result string. */
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VA_START (args, first);
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#ifndef ANSI_PROTOTYPES
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first = va_arg (args, char *);
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#endif
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end = newstr;
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arg = first;
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while (arg != 0)
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{
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while (*arg)
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*end++ = *arg++;
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arg = va_arg (args, const char *);
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}
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*end = '\000';
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va_end (args);
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return (newstr);
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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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register char *result = xmalloc (len + 1);
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bcopy (s, result, len);
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result[len] = 0;
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return result;
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}
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#ifdef _WIN32
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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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{
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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 *) malloc (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 *) realloc (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 starts with a '@' or '$', apply the translation rules above
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and return a new name. Otherwise, return the given name. */
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static const char *
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translate_name (name)
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const char *name;
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{
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char code = name[0];
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char *key;
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const char *prefix = 0;
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int keylen;
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if (code != '@' && code != '$')
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return name;
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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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name = &name[keylen + 1];
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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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/* Remove any trailing directory separator from what we got. */
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if (IS_DIR_SEPARATOR (prefix[strlen (prefix) - 1]))
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{
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char * temp = save_string (prefix, strlen (prefix));
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temp[strlen (temp) - 1] = 0;
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prefix = temp;
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}
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return concat (prefix, name, NULL_PTR);
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}
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/* Update PATH using KEY if PATH starts with PREFIX. */
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const 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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if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
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{
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if (key[0] != '$')
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key = concat ("@", key, NULL_PTR);
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path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
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while (path[0] == '@' || path[0] == '$')
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path = translate_name (path);
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}
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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 != DIR_SEPARATOR_2)
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{
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int i;
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int len = strlen (path);
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char *new_path = save_string (path, len);
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for (i = 0; i < len; i++)
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if (new_path[i] == DIR_SEPARATOR_2)
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new_path[i] = DIR_SEPARATOR;
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path = new_path;
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}
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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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{
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int i;
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int len = strlen (path);
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char *new_path = save_string (path, len);
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for (i = 0; i < len; i++)
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if (new_path[i] == '/')
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new_path[i] = DIR_SEPARATOR;
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path = new_path;
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}
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#endif
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return path;
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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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