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10.535 iswctype

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/iswctype.html

Gnulib module: iswctype

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8.
• This function is declared in <wchar.h>, not in <wctype.h>, on some platforms: HP-UX 11.00.
• This function cannot be called from plain inline or extern inline functions on some platforms: macOS 10.8.

Portability problems not fixed by Gnulib:

• On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters. However, the Gnulib function c32_apply_type_test, provided by Gnulib module c32_apply_type_test, operates on 32-bit wide characters and therefore does not have this limitation.