1 /* $NetBSD: fwide.c,v 1.1 2001/12/07 11:47:42 yamt 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 <assert.h> 32 #include <stdio.h> 33 #include <wchar.h> 34 #include "local.h" 35 #include "reentrant.h" 36 37 int 38 fwide(FILE *fp, int mode) 39 { 40 struct wchar_io_data *wcio; 41 42 _DIAGASSERT(fp != NULL); 43 44 /* 45 * this implementation use only -1, 0, 1 46 * for mode value. 47 * (we don't need to do this, but 48 * this can make things simpler.) 49 */ 50 if (mode > 0) 51 mode = 1; 52 else if (mode < 0) 53 mode = -1; 54 55 FLOCKFILE(fp); 56 wcio = WCIO_GET(fp); 57 if (!wcio) 58 return 0; /* XXX */ 59 60 if (wcio->wcio_mode == 0 && mode != 0) 61 wcio->wcio_mode = mode; 62 else 63 mode = wcio->wcio_mode; 64 FUNLOCKFILE(fp); 65 66 return mode; 67 } 68