1 /* @(#)w_atanh.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: w_atanh.c,v 1.7 1997/10/09 11:34:12 lukem Exp $"); 16 #endif 17 18 /* 19 * wrapper atanh(x) 20 */ 21 22 #include "math.h" 23 #include "math_private.h" 24 25 26 #ifdef __STDC__ 27 double atanh(double x) /* wrapper atanh */ 28 #else 29 double atanh(x) /* wrapper atanh */ 30 double x; 31 #endif 32 { 33 #ifdef _IEEE_LIBM 34 return __ieee754_atanh(x); 35 #else 36 double z,y; 37 z = __ieee754_atanh(x); 38 if(_LIB_VERSION == _IEEE_ || isnan(x)) return z; 39 y = fabs(x); 40 if(y>=1.0) { 41 if(y>1.0) 42 return __kernel_standard(x,x,30); /* atanh(|x|>1) */ 43 else 44 return __kernel_standard(x,x,31); /* atanh(|x|==1) */ 45 } else 46 return z; 47 #endif 48 } 49