* Makefile.in (DLL_OFILES): Add tls_pbuf.o.

* autoload.cc (CreateDesktopW): Replace CreateDesktopA.
	(CreateWindowStationW): Replace CreateWindowStationA.
	(GetUserObjectInformationW): Replace GetUserObjectInformationA.
	* cygheap.h (cwdstuff::get): Assume default buffer size NT_MAX_PATH.
	* cygtls.cc (_cygtls::remove): Free temporary TLS path buffers.
	* cygtls.h (TP_NUM_C_BUFS): Define.
	(TP_NUM_W_BUFS): Define.
	(class tls_pathbuf): New class to store pointers to thread local
	temporary path buffers.
	(_local_storage::pathbufs): New member.
	* environ.cc (win_env::add_cache): Use temporary TLS path buffer instead
	of stack based buffer.
	(posify): Get temporary outenv buffer from calling function.
	(environ_init): Create temporary TLS path buffer for posify.
	(build_env): Create Windows environment block as WCHAR buffer.
	* environ.h (build_env): Change declaration accordingly.
	* external.cc (sync_winenv): Accommodate build_env change.
	* fhandler_console.cc (fhandler_console::need_invisible): Use
	GetUserObjectInformationW and CreateWindowStationW.
	* fhandler_process.cc (format_process_maps): Use temporary TLS path
	buffer instead of stack based buffer.
	* fork.cc (frok::parent): Convert to use CreateProcessW.
	* path.cc: Throughout use temporary TLS path buffers instead of stack
	based buffer.  Replace checks for CYG_MAX_PATH by checks for
	NT_MAX_PATH.
	(getfileattr): New function to replace GetFileAttributesA.
	(normalize_win32_path): Remove Win32 and NT long path prefixes.
	(getwd): Assume PATH_MAX + 1 buffer per SUSv3.
	* path.h (class path_conv): Set path buffer to size NT_MAX_PATH.
	(iswdrive): Define.
	* pinfo.cc (commune_process): Use temporary TLS path buffer instead of
	stack based buffer.
	* registry.cc (get_registry_hive_path): Ditto.
	(load_registry_hive): Ditto.
	* spawn.cc (spawn_guts): Convert to use CreateProcessW and
	CreateProcessAsUserW.
	(av::fixup): Open/close file using NtOpenFile/NtClose.
	* syscalls.cc (mknod_worker): Allow PATH_MAX file name.
	(mknod32): Ditto.
	(getusershell): Ditto.
	* tls_pbuf.cc: New file implementing tls_pathbuf and tmp_pathbuf
	methods.
	* tls_pbuf.h: New header for files using tmp_pathbuf.
	* tlsoffsets.h: Regenerate.
	* winsup.h (NT_MAX_PATH): Define as 32767 to avoid USHORT overflow.

winsup/cygwin/external.cc

@@ -32,6 +32,7 @@ details. */
 #include "environ.h"
 #include <unistd.h>
 #include <stdlib.h>
+#include <wchar.h>
 
 child_info *get_cygwin_startup_info ();
 
@@ -137,9 +138,9 @@ static void
 sync_winenv ()
 {
   int unused_envc;
-  char *envblock = NULL;
+  PWCHAR envblock = NULL;
   char **envp = build_env (cur_environ (), envblock, unused_envc, false);
-  char *p = envblock;
+  PWCHAR p = envblock;
 
   if (envp)
     {
@@ -151,14 +152,14 @@ sync_winenv ()
     return;
   while (*p)
     {
-      char *eq = strchr (p, '=');
+      PWCHAR eq = wcschr (p, L'=');
       if (eq)
 	{
-	  *eq = '\0';
-	  SetEnvironmentVariable (p, ++eq);
+	  *eq = L'\0';
+	  SetEnvironmentVariableW (p, ++eq);
 	  p = eq;
 	}
-      p = strchr (p, '\0') + 1;
+      p = wcschr (p, L'\0') + 1;
     }
   free (envblock);
 }