file.c: fix for UNC

* file.c (realpath_rec): UNC prefix does not end with path separator,
  so new separator is needed after it.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35806 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat May 26 16:26:30 2012  Nobuyoshi Nakada  <[email protected]>
+
+	* file.c (realpath_rec): UNC prefix does not end with path separator,
+	  so new separator is needed after it.
+
 Sat May 26 15:29:22 2012  Koichi Sasada  <[email protected]>
 
 	* test/ruby/test_backtrace.rb (test_caller_lev):

file.c

@@ -3350,6 +3350,13 @@ realpath_rec(long *prefixlenp, VALUE *resolvedp, const char *unresolved, VALUE l
             VALUE testpath = rb_str_dup(*resolvedp);
             if (*prefixlenp < RSTRING_LEN(testpath))
                 rb_str_cat2(testpath, "/");
+#if defined(DOSISH_UNC) || defined(DOSISH_DRIVE_LETTER)
+	    if (*prefixlenp > 1 && *prefixlenp == RSTRING_LEN(testpath)) {
+		const char *prefix = RSTRING_PTR(testpath);
+		const char *last = rb_enc_left_char_head(prefix, prefix + *prefixlenp - 1, prefix + *prefixlenp, enc);
+		if (!isdirsep(*last)) rb_str_cat2(testpath, "/");
+	    }
+#endif
             rb_str_cat(testpath, testname, testnamelen);
             checkval = rb_hash_aref(loopcheck, testpath);
             if (!NIL_P(checkval)) {

test/ruby/test_file.rb

@@ -231,6 +231,14 @@ def test_realdirpath
       assert_equal(realdir, File.realdirpath(".", tst))
       assert_equal(File.join(realdir, "foo"), File.realdirpath("foo", tst))
     }
+    begin
+      result = File.realdirpath("bar", "//:/foo")
+    rescue SystemCallError
+    else
+      if result.start_with?("//")
+        assert_equal("//:/foo/bar", result)
+      end
+    end
   end
 
   def test_utime_with_minus_time_segv