pp_ctl.c: Use safe UTF8SKIP

diff --git a/pp_ctl.c b/pp_ctl.c
index 17d4f0d..a38b9c1 100644 (file)
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -781,7 +781,8 @@ PP(pp_formline)
                         * for safety */
                        grow = linemax;
                        while (linemark--)
-                           s += UTF8SKIP(s);
+                           s += UTF8_SAFE_SKIP(s,
+                                            (U8 *) SvEND(PL_formtarget));
                        linemark = s - (U8*)SvPVX(PL_formtarget);
                    }
                    /* Easy. They agree.  */