Code:
  (lambda ()
    (setq indent-tabs-mode nil)
    (setq c-ts-mode-indent-offset 2)
    (setq c-ts-mode-indent-style 'gnu)
    (c-ts-mode)
    (indent-region (point-min) (point-max)))

Point-Char: |

Name: Basic

=-=
int
main (void)
{
  return 0;
}
=-=-=

Name: Hanging Braces (GNU Style)

=-=
int
main (void)
{
  if (true)
    {
    }
}
=-=-=

Name: Labels (GNU Style)

=-=
int
main (void)
{
 label:
  return 0;
  if (true)
    {
    label:
      return 0;
    }
  else
    {
      if (true)
        {
        label:
          return 0;
        }
    }
}
=-=-=

Name: For Loop with Multi-line Condition (GNU Style)

=-=
int main()
{
  for (int i = 0;
       i < b;
       i++)
    {
      return 0;
    }
}
=-=-=

Name: If-Else (GNU Style)

=-=
int main()
{
  if (true)
    {
      return 0;
    }
  else
    {
      return 1;
    }
}
=-=-=

Name: Empty Line
=-=
int main()
{
  |
}
=-=-=

Name: Multiline Parameter List (bug#60398)

=-=
int f2(int x,
       int y) {
  return x + y;
};
=-=-=

Name: Multiline Block Comments 1 (bug#60270)

=-=
/**
 * @some_func:
 * @arg1:
 */
=-=-=

Name: Multiline Block Comments 2 (bug#60270)

=-=
/*
  some comment
 */
=-=-=

Name: Multiline Block Comments 3 (bug#60270)

=-=
/* some comment
 */
=-=-=

Name: Multiline Block Comments 4 (bug#60270)

=-=
/*
 * Some comment
 */
=-=-=

Name: Multiline Block Comments 5 (bug#60270)

=-=
/*
line one
line 2
 */
=-=
/*
  line one
  line 2
 */
=-=-=


Code:
  (lambda ()
    (setq indent-tabs-mode nil)
    (setq c-ts-mode-indent-offset 8)
    (setq c-ts-mode-indent-style 'linux)
    (c-ts-mode)
    (indent-region (point-min) (point-max)))

Name: Labels (Linux Style)

=-=-=
int main (void)
{
label:
        return 0;
        if (true) {
label:
                return 0;
        }
        else {
                if (true) {
label:
                        return 0;
                }
        }
}
=-=-=