5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbtowc.html}
9 Portability problems fixed by Gnulib:
12 This function is missing on some platforms:
16 Portability problems not fixed by Gnulib:
19 This function accumulates hidden state on some platforms:
20 glibc 2.8 (see @url{https://sourceware.org/bugzilla/show_bug.cgi?id=9674}).
22 On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot
23 accommodate all Unicode characters.