.\" Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved. .\" Copyright (c) 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" Donn Seeley of BSDI. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" 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: src/lib/libc/locale/mbstowcs.3,v 1.4 2004/07/05 06:36:36 ru Exp $ .\" .Dd April 8, 2004 .Dt MBSTOWCS 3 .Os .Sh NAME .Nm mbstowcs .Nd convert a character string to a wide-character string .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In stdlib.h .Ft size_t .Fo mbstowcs .Fa "wchar_t * restrict wcstring" "const char * restrict mbstring" .Fa "size_t nwchars" .Fc .Sh DESCRIPTION The .Fn mbstowcs function converts a multibyte character string .Fa mbstring beginning in the initial conversion state into a wide character string .Fa wcstring . No more than .Fa nwchars wide characters are stored. A terminating null wide character is appended if there is room. .Sh RETURN VALUES The .Fn mbstowcs function returns the number of wide characters converted, not counting any terminating null wide character, or \-1 if an invalid multibyte character was encountered. .Sh ERRORS The .Fn mbstowcs function will fail if: .Bl -tag -width Er .It Bq Er EILSEQ An invalid multibyte sequence was detected. .It Bq Er EINVAL The conversion state is invalid. .El .Sh SEE ALSO .Xr mbsrtowcs 3 , .Xr mbtowc 3 , .Xr multibyte 3 .Sh STANDARDS The .Fn mbstowcs function conforms to .St -isoC-99 .