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10.1281 wcrtomb

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

Gnulib module: wcrtomb

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, HP-UX 11.00, mingw.
• This function produces wrong characters in the C locale on some platforms: Android 4.3.
• This function returns 0 when the first argument is NULL in some locales on some platforms: Solaris 11.3.
• This function does not ignore the second argument when the first argument is NULL on some platforms: MSVC 14.

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 ISO C11 function c32rtomb, provided by Gnulib module c32rtomb, operates on 32-bit wide characters and therefore does not have this limitation.