Fix constant name validation

`X!` etc are invalid constant name.

1 files changed, 13 insertions, 7 deletions

diff --git a/src/variable.c b/src/variable.c
index 14e9da9ef..b712af261 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -428,22 +428,17 @@ mrb_iv_defined(mrb_state *mrb, mrb_value obj, mrb_sym sym)
   return mrb_obj_iv_defined(mrb, mrb_obj_ptr(obj), sym);
 }
 
-#define identchar(c) (ISALNUM(c) || (c) == '_' || !ISASCII(c))
-
 MRB_API mrb_bool
 mrb_iv_name_sym_p(mrb_state *mrb, mrb_sym iv_name)
 {
   const char *s;
-  mrb_int i, len;
+  mrb_int len;
 
   s = mrb_sym2name_len(mrb, iv_name, &len);
   if (len < 2) return FALSE;
   if (s[0] != '@') return FALSE;
   if (s[1] == '@') return FALSE;
-  for (i=1; i<len; i++) {
-    if (!identchar(s[i])) return FALSE;
-  }
-  return TRUE;
+  return mrb_ident_p(s+1, len-1);
 }
 
 MRB_API void
@@ -1114,3 +1109,14 @@ mrb_class_find_path(mrb_state *mrb, struct RClass *c)
   }
   return path;
 }
+
+#define identchar(c) (ISALNUM(c) || (c) == '_' || !ISASCII(c))
+
+mrb_bool
+mrb_ident_p(const char *s, mrb_int len)
+{
+  for (mrb_int i = 0; i < len; i++) {
+    if (!identchar(s[i])) return FALSE;
+  }
+  return TRUE;
+}