* re.c (rb_reg_regsub): returns the given string itself if nothing

  changed.

* string.c (rb_str_sub_bang): keeps code-range as possible.

* string.c (str_gsub): adjusts code-range.  [ruby-core:14566]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14782 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 4 deletions

diff --git a/re.c b/re.c
index eae1ebd05b..4c473a8bb4 100644
--- a/re.c
+++ b/re.c
@@ -2856,13 +2856,10 @@ rb_reg_regsub(VALUE str, VALUE src, struct re_registers *regs, VALUE regexp)
 	}
     }
 
+    if (!val) return str;
     if (p < e) {
-	if (!val) {
-	    val = rb_str_buf_new(e-p);
-	}
         rb_str_buf_cat(val, p, e-p);
     }
-    if (!val) return str;
     rb_enc_associate(val, enc);
 
     return val;