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10.629 mbtowc

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/mbtowc.html

Gnulib module: mbtowc

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Android 4.4.

Portability problems not fixed by Gnulib:

• In UTF-8 locales, this function may return wide characters up to 0x7FFFFFFF (that is, beyond 0x0010FFFF) on some platforms: glibc 2.34.
• This function accumulates hidden state on some platforms: glibc 2.8 (see https://sourceware.org/bugzilla/show_bug.cgi?id=9674).
• On Windows and 32-bit AIX platforms, wchar_t is a 16-bit type and therefore cannot accommodate all Unicode characters.