btowc
=====

POSIX specification: http://www.opengroup.org/onlinepubs/9699919799/functions/btowc.html

Gnulib module: btowc

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: HP-UX 11.00, IRIX 5.3, Solaris 2.6, mingw, Interix 3.5.

Portability problems not fixed by Gnulib:

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