Can't use singlebyte optimization when the replacement is multibyte. [ruby-core:24612]

* string.c (tr_trans): can't use singlebyte optimization when
          the replacement is multibyte. [ruby-core:24612]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24342 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat Aug  1 05:18:36 2009  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (tr_trans): can't use singlebyte optimization when
+	  the replacement is multibyte. [ruby-core:24612]
+
 Fri Jul 31 18:01:34 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* lib/securerandom.rb (SecureRandom.random_bytes): return string should

string.c

@@ -4871,7 +4871,8 @@ tr_trans(VALUE str, VALUE src, VALUE repl, int sflag)
 	    if (r == errc) r = trrepl.now;
 	    if (c < 256) {
 		trans[c] = r;
-		if (r > 255) singlebyte = 0;
+		if (r > 255 || (r > 127 && rb_enc_mbmaxlen(enc) != 1))
+		    singlebyte = 0;
 	    }
 	    else {
 		if (!hash) hash = rb_hash_new();