dir.c: relax base option

* dir.c (dir_glob_options): relax base option.  ignore when nil
  or an empty string as :base option.  [Feature #13056]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59476 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/dir.c b/dir.c
index 017f715080..c02c071b97 100644
--- a/dir.c
+++ b/dir.c
@@ -2466,7 +2466,7 @@ dir_glob_options(VALUE opt, VALUE *base, int *flags)
     kw[0] = rb_intern("base");
     if (flags) kw[1] = rb_intern("flags");
     rb_get_kwargs(opt, kw, 0, flags ? 2 : 1, args);
-    if (args[0] == Qundef) {
+    if (args[0] == Qundef || NIL_P(args[0])) {
 	*base = Qnil;
     }
 #if USE_OPENDIR_AT
@@ -2476,6 +2476,7 @@ dir_glob_options(VALUE opt, VALUE *base, int *flags)
 #endif
     else {
 	GlobPathValue(args[0], TRUE);
+	if (!RSTRING_LEN(args[0])) args[0] = Qnil;
 	*base = args[0];
     }
     if (flags && args[1] != Qundef) {