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int create_table(size_t length) {
  char **table;

  if (sizeof(char *) > SIZE_MAX/length) {
    /* handle overflow */
  }

  size_t table_length = length * sizeof(char *);
  table = (char **)malloc(table_length);

  if (table == NULL) {
    /* Handle error condition */
  }
  /* ... */
  return 0;
}

enum { MAX_TABLE_LENGTH = 256 };

int create_table(size_t length) {
  size_t table_length;
  char **table;

  if (length == 0 || length > MAX_TABLE_LENGTH) {
    /* Handle invalid length */
  }

  /*
   * The wrap check has been omitted based on the assumption 
   * that MAX_TABLE_LENGTH * sizeof(char *) cannot exceed 
   * SIZE_MAX. If this assumption is not valid, a check must 
   * be added.
   */
  assert(length <= SIZE_MAX/sizeof(char *));

  table_length = length * sizeof(char *);

  table = (char **)malloc(table_length);

  if (table == NULL) {
    /* Handle error condition */
  }
  /* ... */
  return 0;
}