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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 wcrtomb 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+wcrtomb \- convert a wide character to a multibyte sequence
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.P
+.BI "size_t wcrtomb(char *restrict " s ", wchar_t " wc \
+", mbstate_t *restrict " ps );
+.fi
+.SH DESCRIPTION
+The main case for this function is when
+.I s
+is
+not NULL and
+.I wc
+is not a null wide character (L\[aq]\e0\[aq]).
+In this case, the
+.BR wcrtomb ()
+function
+converts the wide character
+.I wc
+to its multibyte representation and stores it
+at the beginning of the character
+array pointed to by
+.IR s .
+It updates the shift state
+.IR *ps ,
+and
+returns the length of said multibyte representation,
+that is, the number of bytes
+written at
+.IR s .
+.P
+A different case is when
+.I s
+is not NULL,
+but
+.I wc
+is a null wide character (L\[aq]\e0\[aq]).
+In this case, the
+.BR wcrtomb ()
+function stores at
+the character array pointed to by
+.I s
+the shift sequence needed to
+bring
+.I *ps
+back to the initial state,
+followed by a \[aq]\e0\[aq] byte.
+It updates the shift state
+.I *ps
+(i.e., brings
+it into the initial state),
+and returns the length of the shift sequence plus
+one, that is, the number of bytes written at
+.IR s .
+.P
+A third case is when
+.I s
+is NULL.
+In this case,
+.I wc
+is ignored,
+and the function effectively returns
+.P
+.in +4n
+.EX
+wcrtomb(buf, L\[aq]\e0\[aq], ps)
+.EE
+.in
+.P
+where
+.I buf
+is an internal anonymous buffer.
+.P
+In all of the above cases, if
+.I ps
+is NULL, a static anonymous
+state known only to the
+.BR wcrtomb ()
+function is used instead.
+.SH RETURN VALUE
+The
+.BR wcrtomb ()
+function returns the number of
+bytes that have been or would
+have been written to the byte array at
+.IR s .
+If
+.I wc
+can not be
+represented as a multibyte sequence (according to the current locale),
+.I (size_t)\ \-1
+is returned, and
+.I errno
+set to
+.BR EILSEQ .
+.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 wcrtomb ()
+T}	Thread safety	MT-Unsafe race:wcrtomb/!ps
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001, C99.
+.SH NOTES
+The behavior of
+.BR wcrtomb ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.P
+Passing NULL as
+.I ps
+is not multithread safe.
+.SH SEE ALSO
+.BR mbsinit (3),
+.BR wcsrtombs (3)