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-rwxr-xr-xgcc/prefix.c317
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diff --git a/gcc/prefix.c b/gcc/prefix.c
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-/* Utility to update paths from internal to external forms.
- Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC 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 2 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 COPYING. If not, write to the Free
-Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
-
-/* 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 '$') and further translation will be done as follows
- until none of the two conditions below are met:
-
- 1) If the filename begins with '@', the string between the '@' and
- the end of the name or the first '/' or directory separator will
- be considered a "key" and looked up as follows:
-
- -- If this is a Win32 OS, then the Registry will be examined for
- an entry of "key" in
-
- HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\
-
- if found, that value will be used.
-
- -- If not found (or not a Win32 OS), the environment variable
- key_ROOT (the value of "key" concatenated with the constant "_ROOT")
- is tried. If that fails, then PREFIX (see above) is used.
-
- 2) If the filename begins with a '$', 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"
-#ifdef _WIN32
-#include <windows.h>
-#endif
-#include "prefix.h"
-
-static const char *std_prefix = PREFIX;
-
-static const char *get_key_value (char *);
-static const char *translate_name (const char *);
-static char *save_string (const char *, int);
-
-#ifdef _WIN32
-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 (key)
- char *key;
-{
- const char *prefix = 0;
- char *temp = 0;
-
-#ifdef _WIN32
- prefix = lookup_key (key);
-#endif
-
- if (prefix == 0)
- prefix = getenv (temp = concat (key, "_ROOT", NULL));
-
- if (prefix == 0)
- prefix = std_prefix;
-
- if (temp)
- free (temp);
-
- return prefix;
-}
-
-/* Concatenate a sequence of strings, returning the result.
-
- This function is based on the one in libiberty. */
-
-char *
-concat (const char *first, ...)
-{
- register int length;
- register char *newstr;
- register char *end;
- register const char *arg;
- va_list args;
-
- /* First compute the size of the result and get sufficient memory. */
-
- va_start (args, first);
-
- arg = first;
- length = 0;
-
- while (arg != 0)
- {
- length += strlen (arg);
- arg = va_arg (args, const char *);
- }
-
- newstr = (char *) malloc (length + 1);
- va_end (args);
-
- /* Now copy the individual pieces to the result string. */
-
- va_start (args, first);
-
- end = newstr;
- arg = first;
- while (arg != 0)
- {
- while (*arg)
- *end++ = *arg++;
- arg = va_arg (args, const char *);
- }
- *end = '\000';
- va_end (args);
-
- return (newstr);
-}
-
-/* Return a copy of a string that has been placed in the heap. */
-
-static char *
-save_string (s, len)
- const char *s;
- int len;
-{
- register char *result = xmalloc (len + 1);
-
- copy_memory (s, result, len);
- result[len] = 0;
- return result;
-}
-
-#ifdef _WIN32
-
-/* Look up "key" in the registry, as above. */
-
-static char *
-lookup_key (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, &reg_key);
-
- if (res == ERROR_SUCCESS)
- res = RegOpenKeyExA (reg_key, "Free Software Foundation", 0,
- KEY_READ, &reg_key);
-
- if (res != ERROR_SUCCESS)
- {
- reg_key = (HKEY) INVALID_HANDLE_VALUE;
- return 0;
- }
- }
-
- size = 32;
- dst = (char *) malloc (size);
-
- res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
- if (res == ERROR_MORE_DATA && type == REG_SZ)
- {
- dst = (char *) realloc (dst, size);
- res = RegQueryValueExA (reg_key, key, 0, &type, dst, &size);
- }
-
- if (type != REG_SZ || res != ERROR_SUCCESS)
- {
- free (dst);
- dst = 0;
- }
-
- return dst;
-}
-#endif
-
-/* If NAME starts with a '@' or '$', apply the translation rules above
- and return a new name. Otherwise, return the given name. */
-
-static const char *
-translate_name (name)
- const char *name;
-{
- char code = name[0];
- char *key;
- const char *prefix = 0;
- int keylen;
-
- if (code != '@' && code != '$')
- return name;
-
- for (keylen = 0;
- (name[keylen + 1] != 0 && name[keylen + 1] != '/'
-#ifdef DIR_SEPARATOR
- && name[keylen + 1] != DIR_SEPARATOR
-#endif
- );
- keylen++)
- ;
-
- key = (char *) alloca (keylen + 1);
- strncpy (key, &name[1], keylen);
- key[keylen] = 0;
-
- name = &name[keylen + 1];
-
- if (code == '@')
- {
- prefix = get_key_value (key);
- if (prefix == 0)
- prefix = std_prefix;
- }
- else
- prefix = getenv (key);
-
- if (prefix == 0)
- prefix = PREFIX;
-
- /* Remove any trailing directory separator from what we got. */
- if (prefix[strlen (prefix) - 1] == '/'
-#ifdef DIR_SEPARATOR
- || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
-#endif
- )
- {
- char * temp = save_string (prefix, strlen (prefix));
- temp[strlen (temp) - 1] = 0;
- prefix = temp;
- }
-
- return concat (prefix, name, NULL);
-}
-
-/* Update PATH using KEY if PATH starts with PREFIX. */
-
-const char *
-update_path (path, key)
- const char *path;
- const char *key;
-{
- if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
- {
- if (key[0] != '$')
- key = concat ("@", key, NULL);
-
- path = concat (key, &path[strlen (std_prefix)], NULL);
-
- while (path[0] == '@' || path[0] == '$')
- path = translate_name (path);
- }
-
-#ifdef DIR_SEPARATOR
- if (DIR_SEPARATOR != '/')
- {
- int i;
- int len = strlen (path);
-
- path = save_string (path, len);
- for (i = 0; i < len; i++)
- if (path[i] == '/')
- path[i] = DIR_SEPARATOR;
- }
-#endif
-
- return path;
-}
-
-/* Reset the standard prefix */
-void
-set_std_prefix (prefix, len)
- const char *prefix;
- int len;
-{
- std_prefix = save_string (prefix, len);
-}
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