* string.c (rb_str_concat): use memcpy to copy a string which contains

NUL characters. [ruby-core:47751] [Bug #7090]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37058 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Sep 30 21:18:03 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (rb_str_concat): use memcpy to copy a string which contains
+	  NUL characters. [ruby-core:47751] [Bug #7090]
+
 Sat Sep 29 19:41:53 2012  Hiroshi Shirosaki  <h.shirosaki@gmail.com>
 
 	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): kill child process

string.c

@@ -2158,7 +2158,7 @@ rb_str_concat(VALUE str1, VALUE str2)
 	    rb_raise(rb_eRangeError, "invalid codepoint 0x%X in %s", code, rb_enc_name(enc));
 	}
 	rb_str_resize(str1, pos+len);
-	strncpy(RSTRING_PTR(str1) + pos, buf, len);
+	memcpy(RSTRING_PTR(str1) + pos, buf, len);
 	if (cr == ENC_CODERANGE_7BIT && code > 127)
 	    cr = ENC_CODERANGE_VALID;
 	ENC_CODERANGE_SET(str1, cr);

test/ruby/test_string.rb

@@ -473,6 +473,12 @@ class TestString < Test::Unit::TestCase
   def test_concat
     assert_equal(S("world!"), S("world").concat(33))
     assert_equal(S("world!"), S("world").concat(S('!')))
+
+    bug7090 = '[ruby-core:47751]'
+    result = S("").force_encoding(Encoding::UTF_16LE)
+    result << 0x0300
+    expected = S("\u0300".encode(Encoding::UTF_16LE))
+    assert_equal(expected, result, bug7090)
   end
 
   def test_count