90fd885e30
Instead of just deleting it, turn the original page into a general overview of the multibyte character conversion functions, somewhat similar to stdio(3).
104 lines
3.3 KiB
Groff
104 lines
3.3 KiB
Groff
.\" Copyright (c) 2002, 2003 Tim J. Robbins. All rights reserved.
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Donn Seeley of BSDI.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" From @(#)multibyte.3 8.1 (Berkeley) 6/4/93
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.\" From FreeBSD: src/lib/libc/locale/multibyte.3,v 1.22 2003/11/08 03:23:11 tjr Exp
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.\" $FreeBSD$
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.\"
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.Dd November 19, 2003
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.Dt MBLEN 3
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.Os
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.Sh NAME
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.Nm mblen
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.Nd get number of bytes in a character
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdlib.h
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.Ft int
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.Fn mblen "const char *mbchar" "size_t nbytes"
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.Sh DESCRIPTION
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The
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.Fn mblen
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function computes the length in bytes
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of a multibyte character
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.Fa mbchar .
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Up to
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.Fa nbytes
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bytes are examined.
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.Pp
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A call with a null
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.Fa mbchar
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pointer returns nonzero if the current locale requires shift states,
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zero otherwise;
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if shift states are required, the shift state is reset to the initial state.
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.Sh RETURN VALUES
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If
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.Fa mbchar
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is
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.Dv NULL ,
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the
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.Fn mblen
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function returns nonzero if shift states are supported,
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zero otherwise.
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If
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.Fa mbchar
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is valid,
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.Fn mblen
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returns the number of bytes processed in
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.Fa mbchar ,
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or \-1 if no multibyte character
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could be recognized or converted.
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.Sh ERRORS
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The
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.Fn mblen
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function will fail if:
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.Bl -tag -width Er
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.\".It Bq Er EINVAL
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.\"Invalid argument.
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.It Bq Er EILSEQ
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An invalid multibyte sequence was detected.
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.El
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.Sh SEE ALSO
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.Xr mbrlen 3 ,
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.Xr mbtowc 3
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.Sh STANDARDS
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The
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.Fn mblen
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function conforms to
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.St -isoC .
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.Sh BUGS
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The current implementation does not support shift states.
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