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.\" Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
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.\" From @(#)multibyte.3	8.1 (Berkeley) 6/4/93
.\" From FreeBSD: src/lib/libc/locale/multibyte.3,v 1.22 2003/11/08 03:23:11 tjr Exp
.\" $FreeBSD: release/9.1.0/lib/libc/locale/wcstombs.3 165903 2007-01-09 00:28:16Z imp $
.\"
.Dd April 8, 2004
.Dt WCSTOMBS 3
.Os
.Sh NAME
.Nm wcstombs
.Nd convert a wide-character string to a character string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft size_t
.Fo wcstombs
.Fa "char * restrict mbstring" "const wchar_t * restrict wcstring"
.Fa "size_t nbytes"
.Fc
.Sh DESCRIPTION
The
.Fn wcstombs
function converts a wide character string
.Fa wcstring
into a multibyte character string,
.Fa mbstring ,
beginning in the initial conversion state.
Up to
.Fa nbytes
bytes are stored in
.Fa mbstring .
Partial multibyte characters at the end of the string are not stored.
The multibyte character string is null terminated if there is room.
.Sh RETURN VALUES
The
.Fn wcstombs
function returns the number of bytes converted
(not including any terminating null), if successful, otherwise it returns
.Po Vt size_t Pc Ns \-1 .
.Sh ERRORS
The
.Fn wcstombs
function will fail if:
.Bl -tag -width Er
.It Bq Er EILSEQ
An invalid wide character was encountered.
.It Bq Er EINVAL
The conversion state is invalid.
.El
.Sh SEE ALSO
.Xr mbstowcs 3 ,
.Xr multibyte 3 ,
.Xr wcsrtombs 3 ,
.Xr wctomb 3
.Sh STANDARDS
The
.Fn wcstombs
function conforms to
.St -isoC-99 .