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Linux 2.6 - man page for fgetwc (linux section 3posix)

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

       fgetwc - get a wide-character code from a stream

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

       wint_t fgetwc(FILE *stream);

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

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

       The fgetwc() function may mark the st_atime field of the file associated with  stream  for
       update. The st_atime field shall be marked for update by the first successful execution of
       fgetc(), fgets(), fgetwc(), fgetws(), fread(), fscanf(),  getc(),  getchar(),  gets(),  or
       scanf()	using  stream  that  returns  data  not  supplied  by a prior call to ungetc() or

       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 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 indicate 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
	      process would be delayed in the fgetwc() operation.

       EBADF  The file descriptor underlying stream is not a valid file descriptor open for read-

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

       EINTR  The read operation was terminated due to the receipt of a signal, and no	data  was

       EIO    A  physical I/O error has occurred, or the process is in a background process group
	      attempting to read from its controlling terminal, and either the process is  ignor-
	      ing or blocking the SIGTTIN signal or the process group 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 stream.

       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 capabil-
	      ities 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.



       feof()  ,  ferror()  ,  fopen()	,  the	Base  Definitions volume of IEEE Std 1003.1-2001,
       <stdio.h>, <wchar.h>

       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					FGETWC(P)

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