dir.c: fix escaping multibyte char

* dir.c (has_magic): fix escaping multibyte char, with glob
  meta-char in trailing bytes, e.g., Shift-JIS

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49532 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

dir.c

@@ -1205,9 +1205,9 @@ has_magic(const char *p, const char *pend, int flags, rb_encoding *enc)
 	    return MAGICAL;
 
 	  case '\\':
-	    if (escape && !(c = *p++))
-		return PLAIN;
-	    continue;
+	    if (escape && p++ >= pend)
+		continue;
+	    break;
 
 #ifdef _WIN32
 	  case '~':

test/ruby/test_dir_m17n.rb

@@ -352,6 +352,16 @@ class TestDir_M17N < Test::Unit::TestCase
     end
   end
 
+  def test_glob_escape_multibyte
+    name = "\x81\\".force_encoding(Encoding::Shift_JIS)
+    with_tmpdir do
+      open(name, "w") {} rescue next
+      match, = Dir.glob("#{name}*")
+      next unless match and match.encoding == Encoding::Shift_JIS
+      assert_equal([name], Dir.glob("\\#{name}*"))
+    end
+  end
+
   def test_entries_compose
     bug7267 = '[ruby-core:48745] [Bug #7267]'