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FGETWC(3) Linux Programmer's Manual FGETWC(3)
NAME
fgetwc, getwc - read a wide character from a FILE stream
SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t fgetwc(FILE *stream);
wint_t getwc(FILE *stream);
DESCRIPTION
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).
RETURN VALUE
On success, fgetwc() returns the next wide-character from the stream. Otherwise, WEOF is returned, and errno is set to indicate the error.
ERRORS
Apart from the usual ones, there is
EILSEQ The data obtained from the input stream does not form a valid character.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│fgetwc(), getwc() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
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.
SEE ALSO
fgetws(3), fputwc(3), ungetwc(3), unlocked_stdio(3)
GNU 2021-03-22 FGETWC(3)