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wctomb.3 revision 1.1 
 $NetBSD: wctomb.3,v 1.1 2002/03/18 06:00:27 tshiozak Exp $

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 All rights reserved.

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.Dd Feb 3, 2002
.Dt WCTOMB 3
.Os
.Sh NAME
.Nm wctomb
.Nd converts a wide character to a multibyte character.
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include <stdlib.h>
.Ft int
.Fn wctomb "char * s" "const wchar_t wchar"
.Sh DESCRIPTION
The
.Fn wctomb
convers the wide character
.Fa wchar
to the corresponding multibyte character, and store it to the array
pointed by
.Fa s .
The
.Fn wctomb
may store at most MB_CUR_MAX bytes to the array.

p
In state-dependent encoding,
the
.Fn wctomb
may store the special sequence to change the conversion state
before an actual multibyte character into the array pointed
.Fa s .
If
.Fa wchar
is null wide character (L\'\\0\'),
this function places its own internal state to an initial conversion state.

p
Calling any other functions in the
.Lb libc
never change the internal
state of the
.Fn wctomb ,
except for calling
.Xr setlocale 3
with changing LC_CTYPE category of the current locale.
Such
.Xr setlocale 3
call causes the internal state of this function to be indeterminate.

p
The behaviour of the
.Fn wctomb
is affected by LC_CTYPE category of the current locale.

p
There is a special case:
l -tag -width 012345678901 t s == NULL .Fn wctomb
initializes its own internal state to an initial state, and
determines whether the current encoding is state-dependent.
This function returns 0 if the encoding is state-independent,
otherwise non-zero.
In this case,
.Fa wchar
is completely ignored.
.El
.Sh RETURN VALUES
In the usual case, the
.Fn wctomb
returns:
l -tag -width 012345678901 t positive number of bytes for the valid multibyte character pointed by
.Fa s .
There is no cases that the value returned is greater than
.Fa n
or the value of MB_CUR_MAX macro.
t -1 .Fa wchar
is an invalid wide character.
.El

p
In the case that
.Fa s
is equal to NULL, the
.Fn mbtowc
returns:
l -tag -width 0123456789 t 0 The current encoding is state-independent.
t non-zero The current encoding is state-dependent.
.El
.Sh ERRORS
No errors are defined.
.Sh SEE ALSO
.Xr setlocale 3 .
.Sh STANDARDS
The
.Fn wctomb
function conforms to
.St -ansiC .