* transcode.c (econv_putback): make max argument optional.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@18967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Aug 31 04:38:47 2008  Tanaka Akira  <akr@fsij.org>
+
+	* transcode.c (econv_putback): make max argument optional.
+
 Sun Aug 31 04:35:21 2008  Tanaka Akira  <akr@fsij.org>
 
 	* transcode.c (rb_econv_putback): putback from last byte.

test/ruby/test_econv.rb

@@ -478,7 +478,7 @@ class TestEncodingConverter < Test::Unit::TestCase
     ret = ec.primitive_convert(src="abc\xa1def", dst="", nil, 10)
     assert_equal(:invalid_byte_sequence, ret)
     assert_equal(["abc", "ef"], [dst, src])
-    src = ec.putback(nil) + src
+    src = ec.putback + src
     assert_equal(["abc", "def"], [dst, src])
     ret = ec.primitive_convert(src, dst, nil, 10)
     assert_equal(:finished, ret)

transcode.c

@@ -2727,12 +2727,14 @@ econv_insert_output(VALUE self, VALUE string)
 }
 
 static VALUE
-econv_putback(VALUE self, VALUE max)
+econv_putback(int argc, VALUE *argv, VALUE self)
 {
     rb_econv_t *ec = check_econv(self);
     int n;
     int putbackable;
-    VALUE str;
+    VALUE str, max;
+
+    rb_scan_args(argc, argv, "01", &max);
 
     if (NIL_P(max))
         n = rb_econv_putbackable(ec);
@@ -2834,7 +2836,7 @@ Init_transcode(void)
     rb_define_method(rb_cEncodingConverter, "finish", econv_finish, 0);
     rb_define_method(rb_cEncodingConverter, "primitive_errinfo", econv_primitive_errinfo, 0);
     rb_define_method(rb_cEncodingConverter, "insert_output", econv_insert_output, 1);
-    rb_define_method(rb_cEncodingConverter, "putback", econv_putback, 1);
+    rb_define_method(rb_cEncodingConverter, "putback", econv_putback, -1);
     rb_define_const(rb_cEncodingConverter, "INVALID_MASK", INT2FIX(ECONV_INVALID_MASK));
     rb_define_const(rb_cEncodingConverter, "INVALID_IGNORE", INT2FIX(ECONV_INVALID_IGNORE));
     rb_define_const(rb_cEncodingConverter, "INVALID_REPLACE", INT2FIX(ECONV_INVALID_REPLACE));