@node wcrtomb
@subsection @code{wcrtomb}
@findex wcrtomb

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcrtomb.html}

Gnulib module: wcrtomb
@mindex wcrtomb

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, HP-UX 11.00, mingw.
@item
This function produces wrong characters in the C locale on some platforms:
Android 4.3.
@item
This function returns 0 when the first argument is NULL in some locales on some platforms:
Solaris 11.3.
@item
This function does not ignore the second argument when the first argument is NULL on some platforms:
mingw with UCRT, MSVC 14.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and
therefore cannot accommodate all Unicode characters.
@mindex c32rtomb
However, the ISO C11 function @code{c32rtomb}, provided by Gnulib module
@code{c32rtomb}, operates on 32-bit wide characters and therefore does not have
this limitation.
@end itemize
