146 lines
4.1 KiB
Groff
146 lines
4.1 KiB
Groff
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.\" $NetBSD: wcrtomb.3,v 1.9 2007/02/20 08:33:25 wiz Exp $
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.\"
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.\" Copyright (c)2002 Citrus Project,
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.\" All rights reserved.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.Dd February 4, 2002
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.Dt WCRTOMB 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm wcrtomb
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.Nd converts a wide character to a multibyte character (restartable)
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.\" ----------------------------------------------------------------------
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.Sh LIBRARY
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.Lb libc
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.\" ----------------------------------------------------------------------
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.Sh SYNOPSIS
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.In wchar.h
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.Ft size_t
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.Fn wcrtomb "char * restrict s" "wchar_t wc" "mbstate_t * restrict ps"
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.\" ----------------------------------------------------------------------
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.Sh DESCRIPTION
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.Fn wcrtomb
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converts the wide character given by
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.Fa wc
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to the corresponding multibyte character, and stores it in the array
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pointed to by
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.Fa s
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unless
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.Fa s
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is a null pointer.
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This function will modify the first at most
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.Dv MB_CUR_MAX
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bytes of the array pointed to by
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.Fa s .
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.Pp
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The behaviour of
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.Fn wcrtomb
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is affected by the
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.Dv LC_CTYPE
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category of the current locale.
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.Pp
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These are the special cases:
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.Bl -tag -width 012345678901
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.It "wc == 0"
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For state-dependent encodings,
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.Fn wcrtomb
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stores a nul byte preceded by special byte sequence (if any)
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to return to an initial state in the array pointed to by
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.Fa s ,
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and the state object pointed to by
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.Fa ps
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also returns to an initial state.
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.It "s == NULL"
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.Fn wcrtomb
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just places
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.Fa ps
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into an initial state.
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It is equivalent to the following call:
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.Bd -literal -offset indent
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wcrtomb(buf, L'\\0', ps);
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.Ed
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.Pp
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Here,
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.Fa buf
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is a dummy buffer.
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In this case,
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.Fa wc
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is ignored.
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.It "ps == NULL"
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.Fn mbrtowc
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uses its own internal state object to keep the conversion state,
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instead of
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.Fa ps
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mentioned in this manual page.
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.Pp
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Calling any other functions in
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.Lb libc
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never changes the internal
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state of
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.Fn mbrtowc ,
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which is initialized at startup time of the program.
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.El
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.\" ----------------------------------------------------------------------
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.Sh RETURN VALUES
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.Fn wcrtomb
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returns:
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.Bl -tag -width 012345678901
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.It "positive"
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The number of bytes (including any shift sequences)
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which are stored in the array.
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.It "(size_t)-1"
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.Fa wc
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is not a valid wide character.
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In this case,
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.Fn wcrtomb
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also sets
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.Va errno
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to indicate the error.
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.El
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.\" ----------------------------------------------------------------------
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.Sh ERRORS
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.Fn wcrtomb
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may cause an error in the following case:
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.Bl -tag -width Er
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.It Bq Er EILSEQ
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.Fa wc
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is not a valid wide character.
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.It Bq Er EINVAL
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.Fa ps
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points to an invalid or uninitialized mbstate_t object.
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.El
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.\" ----------------------------------------------------------------------
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.Sh SEE ALSO
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.Xr setlocale 3 ,
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.Xr wctomb 3
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.\" ----------------------------------------------------------------------
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.Sh STANDARDS
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The
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.Fn wcrtomb
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function conforms to
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.St -isoC-amd1 .
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The restrict qualifier is added at
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.St -isoC-99 .
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