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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 fputwc 3 2023-10-31 "Linux man-pages 6.06"
+.SH NAME
+fputwc, putwc \- write a wide character to a FILE stream
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <stdio.h>
+.B #include <wchar.h>
+.P
+.BI "wint_t fputwc(wchar_t " wc ", FILE *" stream );
+.BI "wint_t putwc(wchar_t " wc ", FILE *" stream );
+.fi
+.SH DESCRIPTION
+The
+.BR fputwc ()
+function is the wide-character
+equivalent of the
+.BR fputc (3)
+function.
+It writes the wide character \fIwc\fP to \fIstream\fP.
+If
+\fIferror(stream)\fP becomes true, it returns
+.BR WEOF .
+If a wide-character conversion error occurs,
+it sets \fIerrno\fP to \fBEILSEQ\fP and returns
+.BR WEOF .
+Otherwise, it returns \fIwc\fP.
+.P
+The
+.BR putwc ()
+function or macro functions identically to
+.BR fputwc ().
+It may be implemented as a macro, and may evaluate its argument
+more than once.
+There is no reason ever to use it.
+.P
+For nonlocking counterparts, see
+.BR unlocked_stdio (3).
+.SH RETURN VALUE
+On success,
+.BR fputwc ()
+function returns
+.IR wc .
+Otherwise,
+.B WEOF
+is returned, and
+.I errno
+is set to indicate the error.
+.SH ERRORS
+Apart from the usual ones, there is
+.TP
+.B EILSEQ
+Conversion of \fIwc\fP to the stream's encoding fails.
+.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 fputwc (),
+.BR putwc ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+C99, POSIX.1-2001.
+.SH NOTES
+The behavior of
+.BR fputwc ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.P
+In the absence of additional information passed to the
+.BR fopen (3)
+call, it is
+reasonable to expect that
+.BR fputwc ()
+will actually write the multibyte
+sequence corresponding to the wide character \fIwc\fP.
+.SH SEE ALSO
+.BR fgetwc (3),
+.BR fputws (3),
+.BR unlocked_stdio (3)