Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@16070 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/prefix.c b/gcc/prefix.c
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+++ b/gcc/prefix.c
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+/* Utility to update paths from internal to external forms.
+   Copyright (C) 1997 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 "gansidecl.h"
+#include "stdarg.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+static char *get_key_value     PROTO((char *));
+static char *translate_name    PROTO((char *));
+static char *concat            PVPROTO((char *, ...));
+static char *save_string       PROTO((char *, int));
+
+#ifdef _WIN32
+static char *lookup_key                PROTO((char *));
+static HKEY reg_key = (HKEY) INVALID_HANDLE_VALUE;
+#endif
+
+extern char *getenv ();
+
+/* Given KEY, as above, return its value.  */
+
+static char *
+get_key_value (key)
+     char *key;
+{
+  char *prefix = 0;
+
+#ifdef _WIN32
+  prefix = lookup_key (key);
+#endif
+
+  if (prefix == 0)
+    prefix = getenv (concat (key, "_ROOT", NULL_PTR));
+
+  if (prefix == 0)
+    prefix = PREFIX;
+
+  return prefix;
+}
+
+/* Concatenate a sequence of strings, returning the result.
+
+   This function is based on the one in libiberty.  */
+
+static char *
+concat VPROTO((char *first, ...))
+{
+  register int length;
+  register char *newstr;
+  register char *end;
+  register char *arg;
+  va_list args;
+#ifndef __STDC__
+  char *first;
+#endif
+
+  /* First compute the size of the result and get sufficient memory.  */
+
+  VA_START (args, first);
+#ifndef __STDC__
+  first = va_arg (args, char *);
+#endif
+
+  arg = first;
+  length = 0;
+
+  while (arg != 0)
+    {
+      length += strlen (arg);
+      arg = va_arg (args, char *);
+    }
+
+  newstr = (char *) malloc (length + 1);
+  va_end (args);
+
+  /* Now copy the individual pieces to the result string.  */
+
+  VA_START (args, first);
+#ifndef __STDC__
+  first = va_arg (args, char *);
+#endif
+
+  end = newstr;
+  arg = first;
+  while (arg != 0)
+    {
+      while (*arg)
+       *end++ = *arg++;
+      arg = va_arg (args, 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)
+     char *s;
+     int len;
+{
+  register char *result = (char *) malloc (len + 1);
+
+  bcopy (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 '$', apply the translation rules above
+   and return a new name.  Otherwise, return the given name.  */
+
+static char *
+translate_name (name)
+     char *name;
+{
+  char code = name[0];
+  char *key, *prefix;
+  int keylen;
+
+  if (code != '@' && code != '$')
+    return name;
+
+  for (keylen = 0;
+       (name[keylen + 1] != 0 && name[keylen + 1] != '/'
+#ifdef DIR_SEPARATOR
+       && name[keylen + 1] != DIR_SEPARATOR
+#endif
+       );
+       keylen++)
+    ;
+
+  key = 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 = PREFIX;
+    }
+  else
+    {
+      prefix = getenv (key);
+      if (prefix == 0)
+       prefix = concat ("$", key, NULL_PTR);
+    }
+
+  /* Remove any trailing directory separator from what we got.  */
+  if (prefix[strlen (prefix) - 1] == '/'
+#ifdef DIR_SEPARATOR
+      || prefix[strlen (prefix) - 1] == DIR_SEPARATOR
+#endif
+      )
+    {
+      prefix = save_string (prefix, strlen (prefix));
+      prefix[strlen (prefix) - 1] = 0;
+    }
+
+  return concat (prefix, name, NULL_PTR);
+}
+
+/* Update PATH using KEY if PATH starts with PREFIX.  */
+
+char *
+update_path (path, key)
+     char *path;
+     char *key;
+{
+  if (! strncmp (path, PREFIX, strlen (PREFIX)) && key != 0)
+    {
+      if (key[0] != '$')
+       key = concat ("@", key, NULL_PTR);
+
+      path = concat (key, &path[strlen (PREFIX)], NULL_PTR);
+
+      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;
+}