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, IRIX 6.5, 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.