Section (3) getwchar
getwchar — read a wide character from standard input
getwchar() function is
the wide-character equivalent of the getchar(3) function. It
reads a wide character from
stdin and returns it. If the end of stream
is reached, or if
ferror(stdin) becomes true,
WEOF. If a
wide-character conversion error occurs, it sets
errno to EILSEQ and returns
For a nonlocking counterpart, see unlocked_stdio(3).
For an explanation of the terms used in this section, see attributes(7).
The behavior of
depends on the
category of the current locale.
It is reasonable to expect that
getwchar() will actually read a multibyte
sequence from standard input and then convert it to a wide
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OpenGroup_zsingle_quotesz_s Single UNIX specification