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It seems fine to disallow the '+' and ' ' flags for conversion
specifiers other than d, i, a, A, e, E, f, F, g, and G. If adding a
'+' or ' ' is intended it should put it before '%' ("+%c" instead of

The behavior with repeated flags is also not very well defined,
prohibiting them is probably fine.

On Tue, Aug 31, 2021 at 1:45 PM Roberto Ierusalimschy
<> wrote:
> To define a behavior as undefined sounds like those "this page
> intentionally left blank" pages :-)
> In the particular case of 'printf', the format "%#c" is defined as
> undefined, while the format "%+c" is literally undefined. Should we
> consider "%+c" as undefined behavior(™)?
> -- Roberto