btowc - convert single byte to wide character
The btowc function converts c, interpreted as
a multibyte sequence of length 1, starting in the initial
shift state, to a wide character and returns it. If c
is EOF or not a valid multibyte sequence of length 1, the
btowc function returns WEOF.
The btowc function returns the wide character
converted from the single byte c. If c is EOF
or not a valid multibyte sequence of length 1, it returns
ISO/ANSI C, UNIX98
The behaviour of btowc depends on the LC_CTYPE
category of the current locale.
This function should never be used. It does not work for
encodings which have state, and unnecessarily treats single
bytes differently from multibyte sequences. Use the function