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char *copy(size_t n, char const char *str) {
  int i;
  char *p = (char *)malloc(n);
  if (p == NULL) {
    /* Handle malloc failure */
  }
  for ( i = 0; i < n; ++i ) {
    p[i] = *str++;
  }
  return p;
}

char *p = copy(9, "hi there");

char *copy(rsize_t n, char const char *str) {
  rsize_t i;
  char *p;
  if (n > RSIZE_MAX) {
    /* Handle unreasonable object size error */
  }
  p = (char *)malloc(n);
  if (p == NULL) {
    /* Handle malloc failure */
  }
  for ( i = 0; i < n; ++i ) {
    p[i] = *str++;
  }
  return p;
}

char *p = copy(9, "hi there");