The l length modifier can apply to the c format specifier; in that
case the expected value is of type wint_t. Minimal libc doesn't
define wint_t, and it is complex to do so correctly (must add
<wchar.h>, and use a lot of conditional tricks).
wint_t can differ from wchar_t in rank when wchar_t undergoes default
integral promotion, which it does on xtensa (wchar_t is unsigned
short). So we can use wchar_t as an approximation, except in va_arg
where we need to use a wider type: int covers this case.
Note that we still don't format wide characters, but we do want to
consume the correct amount of data for a default-promoted extended
character.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
6297c667c5