fgetwc, getwc - read a wide character from a FILE stream
wint_t fgetwc(FILE *stream); wint_t getwc(FILE *stream);
The fgetwc() function is the wide-character equivalent of the fgetc(3) function. It reads a wide character from stream and returns it. If the end of stream is reached, or if ferror(stream) becomes true, it returns WEOF. If a wide-character conversion error occurs, it sets errno to EILSEQ and returns WEOF.
The getwc() function or macro functions identically to fgetwc(). It may be implemented as a macro, and may evaluate its argument more than once. There is no reason ever to use it.
For nonlocking counterparts, see unlocked_stdio(3).
The fgetwc() function returns the next wide-character from the stream, or WEOF.
Apart from the usual ones, there is
EILSEQ The data obtained from the input stream does not form a valid character.
The behavior of fgetwc() depends on the LC_CTYPE category of the current locale.
In the absence of additional information passed to the fopen(3) call, it is reasonable to expect that fgetwc() will actually read a multibyte sequence from the stream and then convert it to a wide character.
fgetws(3), fputwc(3), ungetwc(3), unlocked_stdio(3)
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