fwide.c revision 7c2fbfb345896881c631598ee3852ce9ce33fb07
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2008 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include "stdhdr.h"
int
fwide(Sfio_t* f, int mode)
{
STDIO_INT(f, "fwide", int, (Sfio_t*, int), (f, mode))
if (mode > 0)
{
f->bits &= ~SF_MB;
f->bits |= SF_WC;
}
else if (mode < 0)
{
f->bits &= ~SF_WC;
f->bits |= SF_MB;
}
if (f->bits & SF_MB)
return -1;
if (f->bits & SF_WC)
return 1;
if ((f->flags & SF_SYNCED) || f->next > f->data)
{
f->bits |= SF_MB;
return -1;
}
return 0;
}