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initial import

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Roland McGrath
1995-02-18 01:27:10 +00:00
commit 28f540f45b
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stdlib/wctomb.c Normal file
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/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#include <localeinfo.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
extern long int _mb_shift; /* Defined in mbtowc.c. */
/* Convert WCHAR into its multibyte character representation,
putting this in S and returning its length. */
int
DEFUN(wctomb, (s, wchar), register char *s AND wchar_t wchar)
{
register CONST mb_char *mb;
if (_ctype_info->mbchar == NULL)
mb = NULL;
else
mb = _ctype_info->mbchar->mb_chars;
/* If S is NULL, just say if we're shifted or not. */
if (s == NULL)
return _mb_shift != 0;
if (wchar == (wchar_t) '\0')
{
_mb_shift = 0;
/* See ANSI 4.4.1.1, line 21. */
if (s != NULL)
*s = '\0';
return 1;
}
else if (mb == NULL)
{
if ((wchar_t) (char) wchar == wchar && isascii ((char) wchar))
{
/* A normal ASCII character translates to itself. */
if (s != NULL)
*s = (char) wchar;
return 1;
}
return -1;
}
mb += wchar + _mb_shift;
if (mb->string == NULL || mb->len == 0)
return -1;
memcpy((PTR) s, (CONST PTR) mb->string, mb->len + 1);
_mb_shift += mb->shift;
return mb->len;
}