2 files changed, 17 insertions, 16 deletions
diff --git a/src/error.c b/src/error.c
index ed30173bc..421321c3d 100644
--- a/src/error.c
+++ b/src/error.c
@@ -89,7 +89,7 @@ exc_to_s(mrb_state *mrb, mrb_value exc)
 {
   mrb_value mesg = mrb_attr_get(mrb, exc, mrb_intern(mrb, "mesg"));
 
-  if (mrb_nil_p(mesg)) return mrb_str_new2(mrb, mrb_obj_classname(mrb, exc));
+  if (mrb_nil_p(mesg)) return mrb_str_new_cstr(mrb, mrb_obj_classname(mrb, exc));
   return mesg;
 }
 
@@ -140,7 +140,7 @@ exc_inspect(mrb_state *mrb, mrb_value exc)
     }
   }
   else {
-    str = mrb_str_new2(mrb, mrb_obj_classname(mrb, exc));
+    str = mrb_str_new_cstr(mrb, mrb_obj_classname(mrb, exc));
     if (!mrb_nil_p(mesg) && RSTRING_LEN(mesg) > 0) {
       mrb_str_cat2(mrb, str, ": ");
       mrb_str_append(mrb, str, mesg);
@@ -218,7 +218,7 @@ void
 mrb_raise(mrb_state *mrb, struct RClass *c, const char *msg)
 {
   mrb_value mesg;
-  mesg = mrb_str_new2(mrb, msg);
+  mesg = mrb_str_new_cstr(mrb, msg);
   mrb_exc_raise(mrb, mrb_exc_new3(mrb, c, mesg));
 }
 
diff --git a/src/string.c b/src/string.c
index 465398b18..bb4b8c1a6 100644
--- a/src/string.c
+++ b/src/string.c
@@ -236,17 +236,6 @@ mrb_str_new(mrb_state *mrb, const char *p, mrb_int len)
   return mrb_obj_value(s);
 }
 
-mrb_value
-mrb_str_new2(mrb_state *mrb, const char *ptr)
-{
-  struct RString *s;
-  if (!ptr) {
-    mrb_raise(mrb, E_ARGUMENT_ERROR, "NULL pointer given");
-  }
-  s = str_new(mrb, ptr, strlen(ptr));
-  return mrb_obj_value(s);
-}
-
 /*
  *  call-seq: (Caution! NULL string)
  *     String.new(str="")   => new_str
@@ -258,11 +247,23 @@ mrb_value
 mrb_str_new_cstr(mrb_state *mrb, const char *p)
 {
   struct RString *s;
-  int len = strlen(p);
+  size_t len;
+
+  if (p) {
+    len = strlen(p);
+    if (len > MRB_INT_MAX) {
+      len = MRB_INT_MAX;
+    }
+  }
+  else {
+    len = 0;
+  }
 
   s = mrb_obj_alloc_string(mrb);
   s->ptr = (char *)mrb_malloc(mrb, len+1);
-  memcpy(s->ptr, p, len);
+  if (p) {
+    memcpy(s->ptr, p, len);
+  }
   s->ptr[len] = 0;
   s->len = len;
   s->aux.capa = len;