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.\" $OpenBSD: mbstowcs.3,v 1.4 2011/11/16 13:06:21 stsp Exp $
.\" $NetBSD: mbstowcs.3,v 1.6 2003/09/08 17:54:31 wiz Exp $
.\"
.\" Copyright (c)2002 Citrus Project,
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.Dd $Mdocdate: November 16 2011 $
.Dt MBSTOWCS 3
.Os
.\" ----------------------------------------------------------------------
.Sh NAME
.Nm mbstowcs
.Nd converts a multibyte character string to a wide-character string
.\" ----------------------------------------------------------------------
.Sh SYNOPSIS
.Fd #include <stdlib.h>
.Ft size_t
.Fn mbstowcs "wchar_t * restrict pwcs" "const char * restrict s" "size_t n"
.\" ----------------------------------------------------------------------
.Sh DESCRIPTION
The
.Fn mbstowcs
converts a null-terminated multibyte character string pointed to by
.Fa s
to the corresponding wide-character string and stores it in the array
pointed to by
.Fa pwcs .
This function may modify the first at most
.Fa n
elements of the array pointed to by
.Fa pwcs .
Each character will be converted as if
.Xr mbtowc 3
is continuously called, except the internal state of
.Xr mbtowc 3
will not be affected.
.Pp
For state-dependent encoding,
.Fn mbstowcs
implies the multibyte character string pointed to by
.Fa s
always begin with an initial state.
.Pp
These are the special cases:
.Bl -tag -width 012345678901
.It pwcs == NULL
.Fn mbstowcs
returns the number of elements to store the whole wide-character string
corresponding to the multibyte character string pointed to by
.Fa s .
In this case,
.Fa n
is ignored.
.It s == NULL
Undefined (may causes the program to crash).
.El
.\" ----------------------------------------------------------------------
.Sh RETURN VALUES
.Fn mbstowcs
returns:
.Bl -tag -width 012345678901
.It 0 or positive
The value returned is the number of elements stored in the array pointed to by
.Fa pwcs ,
except for a terminating null wide character (if any).
If
.Fa pwcs
is not null and the value returned is equal to
.Fa n ,
the wide-character string pointed to by
.Fa pwcs
is not null terminated.
If
.Fa pwcs
is a null pointer, the value returned is the number of elements to contain
the whole string converted, except for a terminating null wide character.
.It (size_t)-1
The array indirectly pointed to by
.Fa s
contains a byte sequence forming invalid character.
In this case,
.Fn mbstowcs
sets
.Va errno
to indicate the error.
.El
.\" ----------------------------------------------------------------------
.Sh ERRORS
.Fn mbstowcs
may cause an error in the following cases:
.Bl -tag -width Er
.It Bq Er EILSEQ
.Fa s
points to the string containing invalid or incomplete multibyte character.
.El
.\" ----------------------------------------------------------------------
.Sh SEE ALSO
.Xr mbtowc 3 ,
.Xr setlocale 3
.\" ----------------------------------------------------------------------
.Sh STANDARDS
The
.Fn mbstowcs
function conforms to
.St -ansiC .
The restrict qualifier is added at
.\" .St -isoC99 .
ISO/IEC 9899/199
.Pq Dq ISO C99 .
|
