re.c: fix wchar match at EOS

* re.c (rb_memsearch_wchar, rb_memsearch_qchar): test matching
  till the end of string.  [ruby-core:70592] [Bug #11488]
* test/ruby/test_m17n.rb (test_include?, tet_index): add tests by
  Tom Stuart.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51685 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Wed Aug 26 10:52:02 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* re.c (rb_memsearch_wchar, rb_memsearch_qchar): test matching
+	  till the end of string.  [ruby-core:70592] [Bug #11488]
+
+	* test/ruby/test_m17n.rb (test_include?, tet_index): add tests by
+	  Tom Stuart.
+
 Wed Aug 26 09:26:00 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* id_table.c (list_table_extend, hash_table_extend): remove C99

re.c

@@ -227,7 +227,7 @@ rb_memsearch_wchar(const unsigned char *xs, long m, const unsigned char *ys, lon
     const unsigned char *x = xs, x0 = *xs, *y = ys;
     enum {char_size = 2};
 
-    for (n -= m; n > 0; n -= char_size, y += char_size) {
+    for (n -= m; n >= 0; n -= char_size, y += char_size) {
 	if (x0 == *y && memcmp(x+1, y+1, m-1) == 0)
 	    return y - ys;
     }
@@ -240,7 +240,7 @@ rb_memsearch_qchar(const unsigned char *xs, long m, const unsigned char *ys, lon
     const unsigned char *x = xs, x0 = *xs, *y = ys;
     enum {char_size = 4};
 
-    for (n -= m; n > 0; n -= char_size, y += char_size) {
+    for (n -= m; n >= 0; n -= char_size, y += char_size) {
 	if (x0 == *y && memcmp(x+1, y+1, m-1) == 0)
 	    return y - ys;
     }

test/ruby/test_m17n.rb

@@ -1066,6 +1066,10 @@ class TestM17N < Test::Unit::TestCase
     assert_equal(false, e("\xa1\xa2\xa3\xa4").include?(e("\xa3")))
     s = e("\xa3\xb0\xa3\xb1\xa3\xb2\xa3\xb3\xa3\xb4")
     assert_equal(false, s.include?(e("\xb0\xa3")))
+    bug11488 = '[ruby-core:70592] [Bug #11488]'
+    each_encoding("abcdef", "def") do |str, substr|
+      assert_equal(true, str.include?(substr), bug11488)
+    end
   end
 
   def test_index
@@ -1075,6 +1079,10 @@ class TestM17N < Test::Unit::TestCase
     assert_nil(e("\xa1\xa2\xa3\xa4").rindex(e("\xa3")))
     s = e("\xa3\xb0\xa3\xb1\xa3\xb2\xa3\xb3\xa3\xb4")
     assert_raise(Encoding::CompatibilityError){s.rindex(a("\xb1\xa3"))}
+    bug11488 = '[ruby-core:70592] [Bug #11488]'
+    each_encoding("abcdef", "def") do |str, substr|
+      assert_equal(3, str.index(substr), bug11488)
+    end
   end
 
   def test_next