Fix missing `MRB_API` prefix for functions below; clse #4267

Functions to add prototypes to headers:
* mrb_ary_splice()
* mrb_notimplement()
* mrb_vformat()
* mrb_cstr_to_dbl()
* mrb_cstr_to_inum()

Functions to be made `static` (`MRB_API` was not needed):
* mrb_mod_module_function()
* mrb_obj_hash()
* mrb_str_len_to_inum()

Functions to remove `MRB_API` from definitions (referenced from within `libmruby`):
* mrb_mod_cv_defined()
* mrb_mod_cv_get()
* mrb_f_send()

include/mruby.h

@@ -708,6 +708,9 @@ MRB_API struct RClass * mrb_module_get(mrb_state *mrb, const char *name);
  * @return [struct RClass *] A reference to the module.
 */
 MRB_API struct RClass * mrb_module_get_under(mrb_state *mrb, struct RClass *outer, const char *name);
+/* a function to raise NotImplementedError with current method name */
+MRB_API void mrb_notimplement(mrb_state*);
+/* a function to be replacement of unimplemented method */
 MRB_API mrb_value mrb_notimplement_m(mrb_state*, mrb_value);
 
 /**
@@ -1143,6 +1146,8 @@ MRB_API void mrb_warn(mrb_state *mrb, const char *fmt, ...);
 MRB_API mrb_noreturn void mrb_bug(mrb_state *mrb, const char *fmt, ...);
 MRB_API void mrb_print_backtrace(mrb_state *mrb);
 MRB_API void mrb_print_error(mrb_state *mrb);
+/* function for `raisef` formatting */
+MRB_API mrb_value mrb_vformat(mrb_state *mrb, const char *format, va_list ap);
 
 /* macros to get typical exception objects
    note:

include/mruby/array.h

@@ -227,6 +227,22 @@ MRB_API mrb_value mrb_ary_unshift(mrb_state *mrb, mrb_value self, mrb_value item
  */
 MRB_API mrb_value mrb_ary_entry(mrb_value ary, mrb_int offset);
 
+/*
+ * Replace subsequence of an array.
+ *
+ * Equivalent to:
+ *
+ *      ary.shift
+ *
+ * @param mrb The mruby state reference.
+ * @param self The array from which the value will be shifted.
+ * @param head Beginning position of a replacement subsequence.
+ * @param len Length of a replacement subsequence.
+ * @param rpl The array of replacement elements.
+ * @return The receiver array.
+ */
+MRB_API mrb_value mrb_ary_splice(mrb_state *mrb, mrb_value self, mrb_int head, mrb_int len, mrb_value rpl);
+
 /*
  * Shifts the first element from the array.
  *

include/mruby/error.h

@@ -29,7 +29,7 @@ MRB_API mrb_value mrb_exc_backtrace(mrb_state *mrb, mrb_value exc);
 MRB_API mrb_value mrb_get_backtrace(mrb_state *mrb);
 MRB_API mrb_noreturn void mrb_no_method_error(mrb_state *mrb, mrb_sym id, mrb_value args, const char *fmt, ...);
 
-/* declaration for fail method */
+/* declaration for `fail` method */
 MRB_API mrb_value mrb_f_raise(mrb_state*, mrb_value);
 
 struct RBreak {

include/mruby/string.h

@@ -352,7 +352,9 @@ MRB_API mrb_value mrb_str_dup(mrb_state *mrb, mrb_value str);
 MRB_API mrb_value mrb_str_intern(mrb_state *mrb, mrb_value self);
 
 MRB_API mrb_value mrb_str_to_inum(mrb_state *mrb, mrb_value str, mrb_int base, mrb_bool badcheck);
+MRB_API mrb_value mrb_cstr_to_inum(mrb_state *mrb, const char *s, mrb_int base, mrb_bool badcheck);
 MRB_API double mrb_str_to_dbl(mrb_state *mrb, mrb_value str, mrb_bool badcheck);
+MRB_API double mrb_cstr_to_dbl(mrb_state *mrb, const char *s, mrb_bool badcheck);
 
 /*
  * Returns a converted string type.

src/class.c

@@ -2106,7 +2106,7 @@ mrb_mod_eqq(mrb_state *mrb, mrb_value mod)
   return mrb_bool_value(eqq);
 }
 
-MRB_API mrb_value
+static mrb_value
 mrb_mod_module_function(mrb_state *mrb, mrb_value mod)
 {
   mrb_value *argv;

src/kernel.c

@@ -492,7 +492,7 @@ mrb_obj_frozen(mrb_state *mrb, mrb_value self)
  *  <code>Hash</code>. Any hash value that exceeds the capacity of a
  *  <code>Fixnum</code> will be truncated before being used.
  */
-MRB_API mrb_value
+static mrb_value
 mrb_obj_hash(mrb_state *mrb, mrb_value self)
 {
   return mrb_fixnum_value(mrb_obj_id(self));

src/string.c

@@ -2006,7 +2006,7 @@ mrb_str_split_m(mrb_state *mrb, mrb_value str)
   return result;
 }
 
-MRB_API mrb_value
+static mrb_value
 mrb_str_len_to_inum(mrb_state *mrb, const char *str, mrb_int len, mrb_int base, int badcheck)
 {
   const char *p = str;
@@ -2174,7 +2174,7 @@ mrb_str_len_to_inum(mrb_state *mrb, const char *str, mrb_int len, mrb_int base,
 }
 
 MRB_API mrb_value
-mrb_cstr_to_inum(mrb_state *mrb, const char *str, int base, int badcheck)
+mrb_cstr_to_inum(mrb_state *mrb, const char *str, mrb_int base, mrb_bool badcheck)
 {
   return mrb_str_len_to_inum(mrb, str, strlen(str), base, badcheck);
 }

src/variable.c

@@ -621,7 +621,7 @@ mrb_mod_class_variables(mrb_state *mrb, mrb_value mod)
   return ary;
 }
 
-MRB_API mrb_value
+mrb_value
 mrb_mod_cv_get(mrb_state *mrb, struct RClass *c, mrb_sym sym)
 {
   struct RClass * cls = c;
@@ -714,7 +714,7 @@ mrb_cv_set(mrb_state *mrb, mrb_value mod, mrb_sym sym, mrb_value v)
   mrb_mod_cv_set(mrb, mrb_class_ptr(mod), sym, v);
 }
 
-MRB_API mrb_bool
+mrb_bool
 mrb_mod_cv_defined(mrb_state *mrb, struct RClass * c, mrb_sym sym)
 {
   while (c) {

src/vm.c

@@ -593,7 +593,7 @@ mrb_exec_irep(mrb_state *mrb, mrb_value self, struct RProc *p)
  *     k = Klass.new
  *     k.send :hello, "gentle", "readers"   #=> "Hello gentle readers"
  */
-MRB_API mrb_value
+mrb_value
 mrb_f_send(mrb_state *mrb, mrb_value self)
 {
   mrb_sym name;