btowc - convert single byte to wide character
wint_t btowc(int c);
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 WEOF.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of btowc() depends on the LC_CTYPE category of the
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 either mbtowc(3) or the thread-safe
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