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-'\" t
-.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" References consulted:
-.\"   GNU glibc-2 source code and manual
-.\"   Dinkumware C library reference http://www.dinkumware.com/
-.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
-.\"   ISO/IEC 9899:1999
-.\"
-.TH ungetwc 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-ungetwc \- push back a wide character onto a FILE stream
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <wchar.h>
-.P
-.BI "wint_t ungetwc(wint_t " wc ", FILE *" stream );
-.fi
-.SH DESCRIPTION
-The
-.BR ungetwc ()
-function is the wide-character equivalent of the
-.BR ungetc (3)
-function.
-It pushes back a wide character onto
-.I stream
-and returns it.
-.P
-If
-.I wc
-is
-.BR WEOF ,
-it returns
-.BR WEOF .
-If
-.I wc
-is an invalid wide character,
-it sets
-.I errno
-to
-.B EILSEQ
-and returns
-.BR WEOF .
-.P
-If
-.I wc
-is a valid wide character, it is pushed back onto the stream
-and thus becomes available for future wide-character read operations.
-The file-position indicator is decremented by one or more.
-The end-of-file
-indicator is cleared.
-The backing storage of the file is not affected.
-.P
-Note:
-.I wc
-need not be the last wide-character read from the stream;
-it can be any other valid wide character.
-.P
-If the implementation supports multiple push-back operations in a row, the
-pushed-back wide characters will be read in reverse order; however, only one
-level of push-back is guaranteed.
-.SH RETURN VALUE
-The
-.BR ungetwc ()
-function returns
-.I wc
-when successful, or
-.B WEOF
-upon
-failure.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR ungetwc ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.SH NOTES
-The behavior of
-.BR ungetwc ()
-depends on the
-.B LC_CTYPE
-category of the
-current locale.
-.SH SEE ALSO
-.BR fgetwc (3)