1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24#include "stdhdr.h"
25
26int
27fwide(Sfio_t* f, int mode)
28{
29	STDIO_INT(f, "fwide", int, (Sfio_t*, int), (f, mode))
30
31	if (mode > 0)
32	{
33		f->bits &= ~SF_MB;
34		f->bits |= SF_WC;
35	}
36	else if (mode < 0)
37	{
38		f->bits &= ~SF_WC;
39		f->bits |= SF_MB;
40	}
41	if (f->bits & SF_MB)
42		return -1;
43	if (f->bits & SF_WC)
44		return 1;
45	if ((f->flags & SF_SYNCED) || f->next > f->data)
46	{
47		f->bits |= SF_MB;
48		return -1;
49	}
50	return 0;
51}
52