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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
+.\"
+.TH wcsnrtombs 3 2023-10-31 "Linux man-pages 6.06"
+.SH NAME
+wcsnrtombs \- convert a wide-character string to a multibyte string
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.P
+.BI "size_t wcsnrtombs(char " dest "[restrict ." len "], \
+const wchar_t **restrict " src ,
+.BI "                  size_t " nwc ", size_t " len ", \
+mbstate_t *restrict " ps );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR wcsnrtombs ():
+.nf
+    Since glibc 2.10:
+        _POSIX_C_SOURCE >= 200809L
+    Before glibc 2.10:
+        _GNU_SOURCE
+.fi
+.SH DESCRIPTION
+The
+.BR wcsnrtombs ()
+function is like the
+.BR wcsrtombs (3)
+function,
+except that the number of wide characters to be converted,
+starting at
+.IR *src ,
+is limited to
+.IR nwc .
+.P
+If
+.I dest
+is not NULL,
+the
+.BR wcsnrtombs ()
+function converts
+at most
+.I nwc
+wide characters from
+the wide-character string
+.I *src
+to a multibyte string starting at
+.IR dest .
+At most
+.I len
+bytes are written to
+.IR dest .
+The shift state
+.I *ps
+is updated.
+The conversion is effectively performed by repeatedly
+calling
+.IR "wcrtomb(dest, *src, ps)" ,
+as long as this call succeeds,
+and then incrementing
+.I dest
+by the
+number of bytes written and
+.I *src
+by one.
+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 *src
+is left pointing to the invalid wide character,
+.I (size_t)\ \-1
+is returned,
+and
+.I errno
+is set to
+.BR EILSEQ .
+.IP \[bu]
+.I nwc
+wide characters have been
+converted without encountering a null wide character (L\[aq]\e0\[aq]),
+or the length limit forces a stop.
+In this case,
+.I *src
+is left pointing
+to the next wide character to be converted, and the number of bytes written
+to
+.I dest
+is returned.
+.IP \[bu]
+The wide-character string has been completely converted, including the
+terminating null wide character (which has the side effect of bringing back
+.I *ps
+to the initial state).
+In this case,
+.I *src
+is set to NULL, and the number
+of bytes written to
+.IR dest ,
+excluding the terminating null byte (\[aq]\e0\[aq]), is
+returned.
+.P
+If
+.I dest
+is NULL,
+.I len
+is ignored,
+and the conversion proceeds as above,
+except that the converted bytes are not written out to memory, and that
+no destination length limit exists.
+.P
+In both of the above cases,
+if
+.I ps
+is NULL, a static anonymous
+state known only to the
+.BR wcsnrtombs ()
+function is used instead.
+.P
+The programmer must ensure that there is room for at least
+.I len
+bytes
+at
+.IR dest .
+.SH RETURN VALUE
+The
+.BR wcsnrtombs ()
+function returns
+the number of bytes that make up the
+converted part of 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, 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;
+lb lb lbx
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR wcsnrtombs ()
+T}	Thread safety	T{
+.na
+.nh
+MT-Unsafe race:wcsnrtombs/!ps
+T}
+.TE
+.SH STANDARDS
+POSIX.1-2008.
+.SH NOTES
+The behavior of
+.BR wcsnrtombs ()
+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 iconv (3),
+.BR mbsinit (3),
+.BR wcsrtombs (3)