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

PROLOG
       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.

NAME
       ungetwc — push wide-character code back into the input stream

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

       wint_t ungetwc(wint_t wc, FILE *stream);

DESCRIPTION
       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  ungetwc()  function	 shall push the character corresponding to the
       wide-character code specified by wc back onto the input stream  pointed
       to  by  stream.	The pushed-back characters shall be returned by subse‐
       quent reads on that stream in the reverse order	of  their  pushing.  A
       successful intervening call (with the stream pointed to by stream) to a
       file-positioning function (fseek(), fseeko(), fsetpos(),	 or  rewind())
       or  fflush()  shall  discard any pushed-back characters for the stream.
       The external storage corresponding to the stream is unchanged.

       At least one character of push-back shall be provided. If ungetwc()  is
       called too many times on the same stream without an intervening read or
       file-positioning operation on that stream, the operation may fail.

       If the value of wc equals that of the macro WEOF, the  operation	 shall
       fail and the input stream shall be left unchanged.

       A  successful  call  to ungetwc() shall clear the end-of-file indicator
       for the stream. The value of the file-position indicator for the stream
       after  all pushed-back characters have been read, or discarded by call‐
       ing fseek(), fseeko(), fsetpos(), or rewind() (but not fflush()), shall
       be the same as it was before the characters were pushed back. The file-
       position indicator is decremented (by one or more) by  each  successful
       call  to	 ungetwc();  if	 its  value  was 0 before a call, its value is
       unspecified after the call.

RETURN VALUE
       Upon successful completion, ungetwc() shall return  the	wide-character
       code  corresponding  to	the pushed-back character. Otherwise, it shall
       return WEOF.

ERRORS
       The ungetwc() function may fail if:

       EILSEQ An invalid character sequence is detected, or  a	wide-character
	      code does not correspond to a valid character.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Section	 2.5,	Standard  I/O  Streams,	 fseek(),  fsetpos(),  read(),
       rewind(), setbuf()

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

COPYRIGHT
       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			   UNGETWC(3P)
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