1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 14 isnan(d) 15 double d; 16 { 17 register struct IEEEdp { 18 u_int manl : 32; 19 u_int manh : 20; 20 u_int exp : 11; 21 u_int sign : 1; 22 } *p = (struct IEEEdp *)&d; 23 24 return(p->exp == 2047 && (p->manh || p->manl)); 25 } 26 27 isinf(d) 28 double d; 29 { 30 register struct IEEEdp { 31 u_int manl : 32; 32 u_int manh : 20; 33 u_int exp : 11; 34 u_int sign : 1; 35 } *p = (struct IEEEdp *)&d; 36 37 return(p->exp == 2047 && !p->manh && !p->manl); 38 } 39