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 26 int 27 fwide(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