9.548 mbrtowc

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

Gnulib module: mbrtowc

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 instead of (size_t) -2 when the input is empty: glibc 2.19.
• This function returns (size_t) -1 instead of (size_t) -2 when the input is empty: AIX 5.1.
• This function does not put the state into non-initial state when parsing an incomplete multibyte character on some platforms: AIX 5.1, OSF/1 5.1.
• This function does not produce correct results in the zh_CN.GB18030 locale on some platforms: Solaris 8.
• This function fails if the pwc argument is NULL on some platforms: Solaris 7.
• This function does not ignore the pwc argument if the string argument is NULL on some platforms: OSF/1 5.1.
• This function returns the total number of bytes that make up the multibyte character, not the number of bytes that were needed to complete the multibyte character, on some platforms: HP-UX 11.11, Solaris 11 2010-11, mingw, possibly MSVC 9.
• This function may not return 0 when parsing the NUL character on some platforms: Solaris 9.

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.