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      1 /* $NetBSD: fwide.c,v 1.3 2005/06/12 05:21:27 lukem Exp $ */
      2 
      3 /*-
      4  * Copyright (c)2001 Citrus Project,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  *
     28  * $Citrus$
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 #if defined(LIBC_SCCS) && !defined(lint)
     33 __RCSID("$NetBSD: fwide.c,v 1.3 2005/06/12 05:21:27 lukem Exp $");
     34 #endif /* LIBC_SCCS and not lint */
     35 
     36 #include <assert.h>
     37 #include <stdio.h>
     38 #include <wchar.h>
     39 #include "reentrant.h"
     40 #include "local.h"
     41 
     42 int
     43 fwide(FILE *fp, int mode)
     44 {
     45 	struct wchar_io_data *wcio;
     46 
     47 	_DIAGASSERT(fp != NULL);
     48 
     49 	/*
     50 	 * this implementation use only -1, 0, 1
     51 	 * for mode value.
     52 	 * (we don't need to do this, but
     53 	 *  this can make things simpler.)
     54 	 */
     55 	if (mode > 0)
     56 		mode = 1;
     57 	else if (mode < 0)
     58 		mode = -1;
     59 
     60 	FLOCKFILE(fp);
     61 	wcio = WCIO_GET(fp);
     62 	if (!wcio)
     63 		return 0; /* XXX */
     64 
     65 	if (wcio->wcio_mode == 0 && mode != 0)
     66 		wcio->wcio_mode = mode;
     67 	else
     68 		mode = wcio->wcio_mode;
     69 	FUNLOCKFILE(fp);
     70 
     71 	return mode;
     72 }
     73