| |
| /* @(#)w_sinh.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| |
| /* |
| FUNCTION |
| <<sinh>>, <<sinhf>>---hyperbolic sine |
| |
| INDEX |
| sinh |
| INDEX |
| sinhf |
| |
| ANSI_SYNOPSIS |
| #include <math.h> |
| double sinh(double <[x]>); |
| float sinhf(float <[x]>); |
| |
| TRAD_SYNOPSIS |
| #include <math.h> |
| double sinh(<[x]>) |
| double <[x]>; |
| |
| float sinhf(<[x]>) |
| float <[x]>; |
| |
| DESCRIPTION |
| <<sinh>> computes the hyperbolic sine of the argument <[x]>. |
| Angles are specified in radians. <<sinh>>(<[x]>) is defined as |
| @ifnottex |
| . (exp(<[x]>) - exp(-<[x]>))/2 |
| @end ifnottex |
| @tex |
| $${e^x - e^{-x}}\over 2$$ |
| @end tex |
| |
| <<sinhf>> is identical, save that it takes and returns <<float>> values. |
| |
| RETURNS |
| The hyperbolic sine of <[x]> is returned. |
| |
| When the correct result is too large to be representable (an |
| overflow), <<sinh>> returns <<HUGE_VAL>> with the |
| appropriate sign, and sets the global value <<errno>> to |
| <<ERANGE>>. |
| |
| You can modify error handling for these functions with <<matherr>>. |
| |
| PORTABILITY |
| <<sinh>> is ANSI C. |
| <<sinhf>> is an extension. |
| |
| QUICKREF |
| sinh ansi pure |
| sinhf - pure |
| */ |
| |
| /* |
| * wrapper sinh(x) |
| */ |
| |
| #include "fdlibm.h" |
| #include <errno.h> |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double sinh(double x) /* wrapper sinh */ |
| #else |
| double sinh(x) /* wrapper sinh */ |
| double x; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_sinh(x); |
| #else |
| double z; |
| struct exception exc; |
| z = __ieee754_sinh(x); |
| if(_LIB_VERSION == _IEEE_) return z; |
| if(!finite(z)&&finite(x)) { |
| /* sinh(finite) overflow */ |
| #ifndef HUGE_VAL |
| #define HUGE_VAL inf |
| double inf = 0.0; |
| |
| SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ |
| #endif |
| exc.type = OVERFLOW; |
| exc.name = "sinh"; |
| exc.err = 0; |
| exc.arg1 = exc.arg2 = x; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = ( (x>0.0) ? HUGE : -HUGE); |
| else |
| exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL); |
| if (_LIB_VERSION == _POSIX_) |
| errno = ERANGE; |
| else if (!matherr(&exc)) { |
| errno = ERANGE; |
| } |
| if (exc.err != 0) |
| errno = exc.err; |
| return exc.retval; |
| } else |
| return z; |
| #endif |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |