akr	2008-01-08 15:04:26 +0900 (Tue, 08 Jan 2008)

  New Revision: 14944

  Modified files:
    trunk/ChangeLog
    trunk/string.c

  Log:
    * string.c (str_gsub): avoid appending empty pre-match substr.


  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/string.c?r1=14944&r2=14943&diff_format=u
  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/ChangeLog?r1=14944&r2=14943&diff_format=u

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 14943)
+++ ChangeLog	(revision 14944)
@@ -1,3 +1,7 @@
+Tue Jan  8 15:03:10 2008  Tanaka Akira  <akr@f...>
+
+	* string.c (str_gsub): avoid appending empty pre-match substr.
+
 Tue Jan  8 13:05:57 2008  Nobuyoshi Nakada  <nobu@r...>
 
 	* compile.c (iseq_build_from_ary), iseq.c (iseq_load): fix for format change.
Index: string.c
===================================================================
--- string.c	(revision 14943)
+++ string.c	(revision 14944)
@@ -2720,7 +2720,9 @@
 	if (OBJ_TAINTED(val)) tainted = 1;
 
 	len = beg - offset;	/* copy pre-match substr */
-        rb_enc_str_buf_cat(dest, cp, len, str_enc);
+        if (len) {
+            rb_enc_str_buf_cat(dest, cp, len, str_enc);
+        }
 
         rb_str_buf_append(dest, val);
 

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