pack.c: escape and encoding

* pack.c (pack_pack): escape unprintable characters and preserve
  the encoding of warning message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48307 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_pack.rb b/test/ruby/test_pack.rb
index 59edc3eb4b..5d2b656058 100644
--- a/test/ruby/test_pack.rb
+++ b/test/ruby/test_pack.rb
@@ -718,5 +718,13 @@ EXPECTED
     assert_warning(/unknown pack directive ',' in ','/) {
       [].pack(",")
     }
+    assert_warning(/\A[ -~]+\Z/) {
+      [].pack("\x7f")
+    }
+    assert_warning(/\A(.* in '\u{3042}'\n)+\z/) {
+      EnvUtil.with_default_external(Encoding::UTF_8) {
+        [].pack("\u{3042}")
+      }
+    }
   end
 end