bug#28859: Segmentation fault with NULL pointer dereference in 'stty'

[Paul Eggert]

On 10/17/2017 12:37 AM, Pádraig Brady wrote:
> +#define check_argument(arg) \
> +  if (k == n_settings - 1 || ! settings[k+1]) \
> +    { \
> +      error (0, 0, _("missing argument to %s"), quote (arg)); \
> +      usage (EXIT_FAILURE); \
> +    }

How about making this a static function instead of a macro? I am leery 
of macros for all the usual reasons. Admittedly the static function will 
also need k, n_settings, and settings as arguments; still, it seems 
cleaner to me overall.

If you do keep it a macro, please put it inside a do...while so that it 
doesn't cause problems as a then-part with a following else.