freebsd-dev/lib/libc/locale/wctomb.3

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.\" 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.
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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
.\" $FreeBSD$
.\"
.Dd April 8, 2004
.Dt WCTOMB 3
.Os
.Sh NAME
.Nm wctomb
.Nd convert a wide-character code to a character
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft int
.Fn wctomb "char *mbchar" "wchar_t wchar"
.Sh DESCRIPTION
The
.Fn wctomb
function converts a wide character
.Fa wchar
into a multibyte character and stores
the result in
.Fa mbchar .
The object pointed to by
.Fa mbchar
must be large enough to accommodate the multibyte character, which
may be up to
.Dv MB_LEN_MAX
bytes.
.Pp
A call with a null
.Fa mbchar
pointer returns nonzero if the current locale requires shift states,
zero otherwise;
if shift states are required, the shift state is reset to the initial state.
.Sh RETURN VALUES
If
.Fa mbchar
is
.Dv NULL ,
the
.Fn wctomb
function returns nonzero if shift states are supported,
zero otherwise.
If
.Fa mbchar
is valid,
.Fn wctomb
returns
the number of bytes processed in
.Fa mbchar ,
or \-1 if no multibyte character
could be recognized or converted.
In this case,
2004-07-05 06:39:03 +00:00
.Fn wctomb Ns 's
internal conversion state is undefined.
.Sh ERRORS
The
.Fn wctomb
function will fail if:
.Bl -tag -width Er
.It Bq Er EILSEQ
An invalid multibyte sequence was detected.
.It Bq Er EINVAL
The internal conversion state is invalid.
.El
.Sh SEE ALSO
.Xr mbtowc 3 ,
.Xr wcrtomb 3 ,
.Xr wcstombs 3 ,
.Xr wctob 3
.Sh STANDARDS
The
.Fn wctomb
function conforms to
.St -isoC-99 .