wcrtomb
=======

POSIX specification:
 http://www.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, Solaris 2.6, mingw, Interix 3.5.

  * This function returns 0 when the first argument is NULL in some locales on some platforms: AIX 4.3, OSF/1 5.1, Solaris 11 2011-11.

Portability problems not fixed by Gnulib:

  * On AIX and Windows platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.