array.c: unify `mrb_ary_ref` and `mrb_ary_entry`

Use only `mrb_ary_entry` hereafter.

include/mruby/array.h

@@ -176,20 +176,6 @@ MRB_API void mrb_ary_push(mrb_state *mrb, mrb_value array, mrb_value value);
  */
 MRB_API mrb_value mrb_ary_pop(mrb_state *mrb, mrb_value ary);
 
-/*
- * Returns a reference to an element of the array on the given index.
- *
- * Equivalent to:
- *
- *      ary[n]
- *
- * @param mrb The mruby state reference.
- * @param ary The target array.
- * @param n The array index being referenced
- * @return The referenced value.
- */
-MRB_API mrb_value mrb_ary_ref(mrb_state *mrb, mrb_value ary, mrb_int n);
-
 /*
  * Sets a value on an array at the given index
  *
@@ -243,6 +229,7 @@ MRB_API mrb_value mrb_ary_unshift(mrb_state *mrb, mrb_value self, mrb_value item
  * @param offset The element position (negative counts from the tail).
  */
 MRB_API mrb_value mrb_ary_entry(mrb_value ary, mrb_int offset);
+#define mrb_ary_ref(mrb, ary, n) mrb_ary_entry(ary, n)
 
 /*
  * Replace subsequence of an array.

mrbgems/mruby-array-ext/src/array.c

@@ -94,6 +94,12 @@ mrb_ary_at(mrb_state *mrb, mrb_value ary)
   return mrb_ary_entry(ary, pos);
 }
 
+static mrb_value
+ary_ref(mrb_state *mrb, mrb_value ary, mrb_int n)
+{
+  return mrb_ary_entry(ary, n);
+}
+
 static mrb_value
 mrb_ary_values_at(mrb_state *mrb, mrb_value self)
 {
@@ -102,10 +108,9 @@ mrb_ary_values_at(mrb_state *mrb, mrb_value self)
 
   mrb_get_args(mrb, "*", &argv, &argc);
 
-  return mrb_get_values_at(mrb, self, RARRAY_LEN(self), argc, argv, mrb_ary_ref);
+  return mrb_get_values_at(mrb, self, RARRAY_LEN(self), argc, argv, ary_ref);
 }
 
-
 /*
  *  call-seq:
  *     ary.slice!(index)         -> obj or nil

src/array.c

@@ -694,19 +694,6 @@ mrb_ary_unshift_m(mrb_state *mrb, mrb_value self)
   return self;
 }
 
-MRB_API mrb_value
-mrb_ary_ref(mrb_state *mrb, mrb_value ary, mrb_int n)
-{
-  struct RArray *a = mrb_ary_ptr(ary);
-  mrb_int len = ARY_LEN(a);
-
-  /* range check */
-  if (n < 0) n += len;
-  if (n < 0 || len <= n) return mrb_nil_value();
-
-  return ARY_PTR(a)[n];
-}
-
 MRB_API void
 mrb_ary_set(mrb_state *mrb, mrb_value ary, mrb_int n, mrb_value val)
 {
@@ -1191,15 +1178,16 @@ mrb_ary_empty_p(mrb_state *mrb, mrb_value self)
 }
 
 MRB_API mrb_value
-mrb_ary_entry(mrb_value ary, mrb_int offset)
+mrb_ary_entry(mrb_value ary, mrb_int n)
 {
-  if (offset < 0) {
-    offset += RARRAY_LEN(ary);
-  }
-  if (offset < 0 || RARRAY_LEN(ary) <= offset) {
-    return mrb_nil_value();
-  }
-  return RARRAY_PTR(ary)[offset];
+  struct RArray *a = mrb_ary_ptr(ary);
+  mrb_int len = ARY_LEN(a);
+
+  /* range check */
+  if (n < 0) n += len;
+  if (n < 0 || len <= n) return mrb_nil_value();
+
+  return ARY_PTR(a)[n];
 }
 
 static mrb_value