reduce RSTRING_PTR usage

1 files changed, 6 insertions, 4 deletions

diff --git a/src/symbol.c b/src/symbol.c
index 7206778d6..1b106ad98 100644
--- a/src/symbol.c
+++ b/src/symbol.c
@@ -394,15 +394,17 @@ sym_inspect(mrb_state *mrb, mrb_value sym)
   const char *name;
   mrb_int len;
   mrb_sym id = mrb_symbol(sym);
+  char *sp;
 
   name = mrb_sym2name_len(mrb, id, &len);
   str = mrb_str_new(mrb, 0, len+1);
-  RSTRING_PTR(str)[0] = ':';
-  memcpy(RSTRING_PTR(str)+1, name, len);
+  sp = RSTRING_PTR(str);
+  sp[0] = ':';
+  memcpy(sp+1, name, len);
   if (!symname_p(name) || strlen(name) != len) {
     str = mrb_str_dump(mrb, str);
-    RSTRING_PTR(str)[0] = ':';
-    RSTRING_PTR(str)[1] = '"';
+    sp[0] = ':';
+    sp[1] = '"';
   }
   return str;
 }