lib/libc/pc532/gen/isinf.c

   1 /*-
   2  * Copyright (c) 1991 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 /*static char sccsid[] = "@(#)isinf.c   5.1 (Berkeley) 3/18/91"; */
  36 static char rcsid[] = "";
  37 #endif /* LIBC_SCCS and not lint */
  38
  39
  40 /* I have not verified that this is correct for the ns32532 -- PAN */
  41
  42 #include <sys/types.h>
  43
  44 isnan(d)
  45         double d;
  46 {
  47         register struct IEEEdp {
  48                 u_int manl : 32;
  49                 u_int manh : 20;
  50                 u_int  exp : 11;
  51                 u_int sign :  1;
  52         } *p = (struct IEEEdp *)&d;
  53
  54         return(p->exp == 2047 && (p->manh || p->manl));
  55 }
  56
  57 isinf(d)
  58         double d;
  59 {
  60         register struct IEEEdp {
  61                 u_int manl : 32;
  62                 u_int manh : 20;
  63                 u_int  exp : 11;
  64                 u_int sign :  1;
  65         } *p = (struct IEEEdp *)&d;
  66
  67         return(p->exp == 2047 && !p->manh && !p->manl);
  68 }