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10.1322 wctrans

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

Gnulib module: wctrans

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, HP-UX 11.00, mingw, MSVC 9, Android 7.1.
• This function does not support the "tolower" and "toupper" mappings on some platforms: NetBSD 10.0. (It returns non-null values for the arguments "towlower" and "towupper", but with these values, the function towctrans always crashes.)

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_get_mapping, provided by Gnulib module c32_get_mapping, operates on 32-bit wide characters and therefore does not have this limitation.