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getwc(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

   The  fgetwc() function returns the next wide-character from the stream,
   or WEOF.  In the event of an error, errno is set to indicate the cause.

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)

COLOPHON

   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at
   https://www.kernel.org/doc/man-pages/.



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