MB_LEN_MAX - maximum multibyte length of a character across all locales
The MB_LEN_MAX macro is the upper bound for the number of bytes needed
to represent a single wide character, across all locales.
A constant integer >= 1.
ANSI C, POSIX.1
The entities MB_LEN_MAX and sizeof(wchar_t) are totally unrelated. In
the GNU libc, MB_LEN_MAX is typically 6 while sizeof(wchar_t) is 4.
Linux 1999-07-04 MB_LEN_MAX(3)
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