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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 wcstombs 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+wcstombs \- convert a wide-character string to a multibyte string
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <stdlib.h>
+.P
+.BI "size_t wcstombs(char " dest "[restrict ." n "], \
+const wchar_t *restrict " src ,
+.BI "                size_t " n );
+.fi
+.SH DESCRIPTION
+If
+.I dest
+is not NULL, the
+.BR wcstombs ()
+function converts
+the wide-character string
+.I src
+to a multibyte string starting at
+.IR dest .
+At most
+.I n
+bytes are written to
+.IR dest .
+The sequence of characters placed in
+.I dest
+begins in the initial shift state.
+The conversion can stop for three reasons:
+.IP \[bu] 3
+A wide character has been encountered that can not be represented as a
+multibyte sequence (according to the current locale).
+In this case,
+.I (size_t)\ \-1
+is returned.
+.IP \[bu]
+The length limit forces a stop.
+In this case, the number of bytes written to
+.I dest
+is returned, but the shift state at this point is lost.
+.IP \[bu]
+The wide-character string has been completely converted, including the
+terminating null wide character (L\[aq]\e0\[aq]).
+In this case, the conversion ends in the initial shift state.
+The number of bytes written to
+.IR dest ,
+excluding the terminating null byte (\[aq]\e0\[aq]), is returned.
+.P
+The programmer must ensure that there is room for at least
+.I n
+bytes
+at
+.IR dest .
+.P
+If
+.I dest
+is NULL,
+.I n
+is ignored, and the conversion proceeds as
+above, except that the converted bytes are not written out to memory,
+and no length limit exists.
+.P
+In order to avoid the case 2 above, the programmer should make sure
+.I n
+is greater than or equal to
+.IR "wcstombs(NULL,src,0)+1" .
+.SH RETURN VALUE
+The
+.BR wcstombs ()
+function returns the number of bytes that make up the
+converted part of a multibyte sequence,
+not including the terminating null byte.
+If a wide character was encountered which could not be
+converted,
+.I (size_t)\ \-1
+is returned.
+.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 wcstombs ()
+T}	Thread safety	MT-Safe
+.TE
+.SH VERSIONS
+The function
+.BR wcsrtombs (3)
+provides a better interface to the same functionality.
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001, C99.
+.SH NOTES
+The behavior of
+.BR wcstombs ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.SH SEE ALSO
+.BR mblen (3),
+.BR mbstowcs (3),
+.BR mbtowc (3),
+.BR wcsrtombs (3),
+.BR wctomb (3)