* rb_w32_fstat{,i64}: speed up. adjuting timestamps in this function

is to get rid of the side effect of ENV["TZ"].  then, if ENV["TZ"] is
  not set, no need to adjust.  this change makes File#stat about 60%
  faster.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48394 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Thu Nov 13 12:11:18 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* rb_w32_fstat{,i64}: speed up.  adjuting timestamps in this function
+	  is to get rid of the side effect of ENV["TZ"].  then, if ENV["TZ"] is
+	  not set, no need to adjust.  this change makes File#stat about 60%
+	  faster.
+
 Thu Nov 13 11:56:12 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* st.c: include "internal.h" for STATIC_ASSERT.

win32/win32.c

@@ -4815,6 +4815,8 @@ rb_w32_fstat(int fd, struct stat *st)
     if (ret) return ret;
 #ifdef __BORLANDC__
     st->st_mode &= ~(S_IWGRP | S_IWOTH);
+#else
+    if (GetEnvironmentVariableW(L"TZ", NULL, 0) == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND) return ret;
 #endif
     if (GetFileInformationByHandle((HANDLE)_get_osfhandle(fd), &info)) {
 #ifdef __BORLANDC__
@@ -4835,7 +4837,12 @@ rb_w32_fstati64(int fd, struct stati64 *st)
 {
     BY_HANDLE_FILE_INFORMATION info;
     struct stat tmp;
-    int ret = fstat(fd, &tmp);
+    int ret;
+
+#ifndef __BORLANDC__
+    if (GetEnvironmentVariableW(L"TZ", NULL, 0) == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND) return _fstati64(fd, st);
+#endif
+    ret = fstat(fd, &tmp);
 
     if (ret) return ret;
 #ifdef __BORLANDC__