fgetwc man page on Archlinux

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FGETWC(3P)		   POSIX Programmer's Manual		    FGETWC(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       fgetwc — get a wide-character code from a stream

       #include <stdio.h>
       #include <wchar.h>

       wint_t fgetwc(FILE *stream);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       The fgetwc() function shall obtain the next character (if present) from
       the input stream pointed to by stream, convert that to the  correspond‐
       ing wide-character code, and advance the associated file position indi‐
       cator for the stream (if defined).

       If an error occurs, the resulting value of the file position  indicator
       for the stream is unspecified.

       The  fgetwc()  function	may mark the last data access timestamp of the
       file associated with stream for update. The last data access  timestamp
       shall  be  marked  for  update  by  the	first  successful execution of
       fgetwc(), fgetws(), fwscanf(), getwc(),	getwchar(),  vfwscanf(),  vws‐
       canf(),	or  wscanf()  using stream that returns data not supplied by a
       prior call to ungetwc().

       The fgetwc() function shall not change the setting of errno if success‐

       Upon  successful	 completion,  the  fgetwc()  function shall return the
       wide-character code of the character read from the input stream pointed
       to  by stream converted to a type wint_t.  If the end-of-file indicator
       for the stream is set, or if the stream is at end-of-file, the  end-of-
       file  indicator	for  the stream shall be set and fgetwc() shall return
       WEOF. If a read error occurs, the error indicator for the stream	 shall
       be set, fgetwc() shall return WEOF, and shall set errno to indicate the
       error.  If an encoding error occurs, the error indicator for the stream
       shall  be set, fgetwc() shall return WEOF, and shall set errno to indi‐
       cate the error.

       The fgetwc() function shall fail if data needs to be read and:

       EAGAIN The O_NONBLOCK flag is set for the  file	descriptor  underlying
	      stream  and  the	thread would be delayed in the fgetwc() opera‐

       EBADF  The file descriptor  underlying  stream  is  not	a  valid  file
	      descriptor open for reading.

       EILSEQ The  data	 obtained  from the input stream does not form a valid

       EINTR  The read operation was terminated due to the receipt of  a  sig‐
	      nal, and no data was transferred.

       EIO    A	 physical I/O error has occurred, or the process is in a back‐
	      ground process group attempting to  read	from  its  controlling
	      terminal,	 and  either the calling thread is blocking SIGTTIN or
	      the process is ignoring SIGTTIN or  the  process	group  of  the
	      process  is  orphaned.   This  error  may	 also be generated for
	      implementation-defined reasons.

	      The file is a regular file and an attempt was made to read at or
	      beyond  the  offset  maximum  associated	with the corresponding

       The fgetwc() function may fail if:

       ENOMEM Insufficient storage space is available.

       ENXIO  A request was made of a nonexistent device, or the  request  was
	      outside the capabilities of the device.

       The following sections are informative.


       The ferror() or feof() functions must be used to distinguish between an
       error condition and an end-of-file condition.



       Section 2.5, Standard I/O Streams, feof(), ferror(), fopen()

       The Base Definitions volume of POSIX.1‐2008, <stdio.h>, <wchar.h>

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.unix.org/online.html .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			    FGETWC(3P)

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