133 lines
4.0 KiB
Groff
133 lines
4.0 KiB
Groff
.\" $NetBSD: wcstombs.3,v 1.7 2004/01/24 16:58:54 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 WCSTOMBS 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm wcstombs
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.Nd converts a wide character string to a multibyte character string
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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 stdlib.h
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.Ft size_t
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.Fn wcstombs "const char * restrict s" "wchar_t * restrict pwcs" "size_t n"
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.\" ----------------------------------------------------------------------
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.Sh DESCRIPTION
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.Fn wcstombs
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converts the null-terminated wide character string pointed to by
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.Fa pwcs
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to the corresponding multibyte character string,
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and stores it in the array pointed to by
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.Fa s .
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This function may modify the first at most
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.Fa n
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bytes of the array pointed to by
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.Fa s .
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Each character will be converted as if
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.Xr wctomb 3
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is continuously called, except the internal state of
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.Xr wctomb 3
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will not be affected.
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.Pp
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For state-dependent encoding, the
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.Fn wcstombs
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implies the result multibyte character string pointed to by
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.Fa s
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always to begin with an initial state.
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.Pp
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The behaviour of
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.Fn wcstombs
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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 s == NULL
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The
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.Fn wcstombs
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returns the number of bytes to store the whole multibyte character string
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corresponding to the wide character string pointed to by
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.Fa pwcs .
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In this case,
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.Fa n
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is ignored.
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.It pwcs == NULL
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Undefined (may cause the program to crash).
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.El
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.\" ----------------------------------------------------------------------
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.Sh RETURN VALUES
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.Fn wcstombs
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returns:
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.Bl -tag -width 012345678901
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.It 0 or positive
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Number of bytes stored in the array pointed to by
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.Fa s .
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There are no cases that the value returned is greater than
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.Fa n
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(unless
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.Fa s
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is a null pointer).
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If the return value is equal to
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.Fa n ,
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the string pointed to by
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.Fa s
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will not be null-terminated.
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.It (size_t)-1
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.Fa pwcs
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points to a string containing an invalid wide character.
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.Fn wcstombs
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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 wcstombs
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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 pwcs
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points to a string containing an invalid wide character.
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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 wcstombs
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function conforms to
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.St -ansiC .
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The restrict qualifier is added at
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.St -isoC-99 .
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