* cygheap.cc (cwcsdup): New function.

(cwcsdup1): New function.
	* cygheap.h (cygheap_user::get_windows_id): New method returning PWCHAR.
	(cwcsdup): Declare.
	(cwcsdup1): Declare.
	* registry.cc (get_registry_hive_path): Use WCHAR instead of char
	throughout.
	(load_registry_hive): Ditto.
	* registry.h (get_registry_hive_path): Change declaration accordingly.
	(load_registry_hive): Ditto.
	* sec_helper.cc (cygpsid::string): New method returning PWCHAR.
	* security.h (cygpsid::string): Declare.
	* syscalls.cc (seteuid32): Convert local name var to WCHAR.
	* uinfo.cc (cygheap_user::env_userprofile): Convert local name buffers
	to WCHAR.  Call sys_wcstombs_alloc to generate puserprof buffer.

	* winsup.h: Fix comment.
	(NT_MAX_PATH): New definition for maximum internal path length.
	Use throughout where appropriate.
	* include/limits.h (PATH_MAX): Set to 4096 as on Linux.

winsup/cygwin/sec_helper.cc

@@ -101,6 +101,17 @@ cygpsid::get_id (BOOL search_grp, int *type)
   return id;
 }
 
+PWCHAR
+cygpsid::string (PWCHAR nsidstr) const
+{
+  UNICODE_STRING sid;
+
+  if (!psid || !nsidstr) 
+    return NULL;
+  RtlInitEmptyUnicodeString (&sid, nsidstr, 256);
+  RtlConvertSidToUnicodeString (&sid, psid, FALSE);
+  return nsidstr;
+}
 
 char *
 cygpsid::string (char *nsidstr) const