sprintf.c: QUOTE flag

* sprintf.c (ruby__sfvextra): add QUOTE flag to escape unprintable
  characters.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42251 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/sprintf.c b/sprintf.c
index 09876bf812..97b2126422 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -1171,6 +1171,7 @@ ruby__sfvextra(rb_printf_buffer *fp, size_t valsize, void *valp, long *sz, int s
     }
     else {
 	value = rb_obj_as_string(value);
+	if (sign == ' ') value = QUOTE(value);
     }
     enc = rb_enc_compatible(result, value);
     if (enc) {