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/*

FUNCTION

<<wctomb>>---minimal wide char to multibyte converter

INDEX

        wctomb

ANSI_SYNOPSIS

        #include <stdlib.h>

        int wctomb(char *<[s]>, wchar_t <[wchar]>);

TRAD_SYNOPSIS

        #include <stdlib.h>

        int wctomb(<[s]>, <[wchar]>)

        char *<[s]>;

        wchar_t <[wchar]>;

DESCRIPTION

When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming

implementation of <<wctomb>>.  The

only ``wide characters'' recognized are single bytes,

and they are ``converted'' to themselves.

When _MB_CAPABLE is defined, this routine calls <<_wctomb_r>> to perform

the conversion, passing a state variable to allow state dependent

decoding.  The result is based on the locale setting which may

be restricted to a defined set of locales.

Each call to <<wctomb>> modifies <<*<[s]>>> unless <[s]> is a null

pointer or _MB_CAPABLE is defined and <[wchar]> is invalid.

RETURNS

This implementation of <<wctomb>> returns <<0>> if

<[s]> is <<NULL>>; it returns <<-1>> if _MB_CAPABLE is enabled

and the wchar is not a valid multi-byte character, it returns <<1>>

if _MB_CAPABLE is not defined or the wchar is in reality a single

byte character, otherwise it returns the number of bytes in the

multi-byte character.

PORTABILITY

<<wctomb>> is required in the ANSI C standard.  However, the precise

effects vary with the locale.

<<wctomb>> requires no supporting OS subroutines.

*/

#ifndef _REENT_ONLY

#include <newlib.h>

#include <stdlib.h>

#include <errno.h>

#include "local.h"

int

_DEFUN (wctomb, (s, wchar),

        char *s _AND

        wchar_t wchar)

{

#ifdef _MB_CAPABLE

        _REENT_CHECK_MISC(_REENT);

        return __wctomb (_REENT, s, wchar, __locale_charset (),

                         &(_REENT_WCTOMB_STATE(_REENT)));

#else /* not _MB_CAPABLE */

        if (s == NULL)

                return 0;

        /* Verify that wchar is a valid single-byte character.  */

        if ((size_t)wchar >= 0x100) {

                errno = EILSEQ;

                return -1;

        }

        *s = (char) wchar;

        return 1;

#endif /* not _MB_CAPABLE */

}

#endif /* !_REENT_ONLY */