#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int reverse(void * array, const size_t offset, const size_t length, const size_t size) {
  void * temp = malloc(size);
  if (temp == NULL) {
    return EXIT_FAILURE;
  }
  size_t s = (offset + 0) * size; // start
  size_t e = (length - 1) * size; // end
  while (s < e) {
    //const int halp = length / 2;
    //for (int i = 0; i < halp; i++) {
    memcpy(temp, ((char *) array) + s, size);
    memcpy((char *) array + s, (char *) array + e, size);
    memcpy((char *) array + e, temp, size);
    s += size;
    e -= size;
  }
  free(temp);
  return EXIT_SUCCESS;
}

void print(int * array, size_t length) {
  for (int i = 0; i < length; i++) {
    printf("array[%d]: %d\n", i, array[i]);
  }
}

int main(int argc, char * argv[]) {
  const int length = 10;
  int * array = (int *) calloc(length, sizeof(int));
  for (int i = 0; i < length; i++) {
    array[i] = i;
  }
  print(array, length);
  printf("---------------------------------------\n");
  if (reverse(array, 0, length, sizeof(int)) == EXIT_FAILURE) {
    return EXIT_FAILURE;
  }
  print(array, length);
  return EXIT_SUCCESS;
}