#include "libc.h"

/*! \brief Function pointer for initialization/finalization functions for global
 * objects required since GCC 4.7 and later.
 *
 * These symbols appear kind of magically due to the compiler
 */
extern void (*__preinit_array_start[])();
extern void (*__preinit_array_end[])();
extern void (*__init_array_start[])();
extern void (*__init_array_end[])();
extern void (*__fini_array_start[])();
extern void (*__fini_array_end[])();

namespace CSU {

void initializer() {
  const unsigned int preinit_size = __preinit_array_end - __preinit_array_start;
  for (unsigned int i = 0; i != preinit_size; ++i) {
    (*__preinit_array_start[i])();
  }

  const size_t size = __init_array_end - __init_array_start;
  for (size_t i = 0; i < size; i++) {
    (*__init_array_start[i])();
  }
}

void finalizer() {
  const unsigned int fini_size = __fini_array_end - __fini_array_start;
  for (unsigned int i = 0; i != fini_size; ++i) {
    (*__fini_array_start[i])();
  }
}

}  // namespace CSU

extern "C" int atexit(void (*func)(void)) {
  // Registers a function that will be executed on exit.
  // We simply ignore those functions, as we don't need them for our operating
  // systems.
  (void)func;

  return 0;
}