1 
2 /* @(#)w_sinh.c 5.1 93/09/24 */
3 /*
4  * ====================================================
5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6  *
7  * Developed at SunPro, a Sun Microsystems, Inc. business.
8  * Permission to use, copy, modify, and distribute this
9  * software is freely granted, provided that this notice
10  * is preserved.
11  * ====================================================
12  */
13 
14 
15 /*
16 FUNCTION
17         <<sinh>>, <<sinhf>>---hyperbolic sine
18 
19 INDEX
20 	sinh
21 INDEX
22 	sinhf
23 
24 ANSI_SYNOPSIS
25         #include <math.h>
26         double sinh(double <[x]>);
27         float  sinhf(float <[x]>);
28 
29 TRAD_SYNOPSIS
30         #include <math.h>
31         double sinh(<[x]>)
32         double <[x]>;
33 
34         float  sinhf(<[x]>)
35         float <[x]>;
36 
37 DESCRIPTION
38 	<<sinh>> computes the hyperbolic sine of the argument <[x]>.
39 	Angles are specified in radians.   <<sinh>>(<[x]>) is defined as
40 	@ifnottex
41 	. (exp(<[x]>) - exp(-<[x]>))/2
42 	@end ifnottex
43 	@tex
44 	$${e^x - e^{-x}}\over 2$$
45 	@end tex
46 
47 	<<sinhf>> is identical, save that it takes and returns <<float>> values.
48 
49 RETURNS
50 	The hyperbolic sine of <[x]> is returned.
51 
52 	When the correct result is too large to be representable (an
53 	overflow),  <<sinh>> returns <<HUGE_VAL>> with the
54 	appropriate sign, and sets the global value <<errno>> to
55 	<<ERANGE>>.
56 
57 	You can modify error handling for these functions with <<matherr>>.
58 
59 PORTABILITY
60 	<<sinh>> is ANSI C.
61 	<<sinhf>> is an extension.
62 
63 QUICKREF
64 	sinh ansi pure
65 	sinhf - pure
66 */
67 
68 /*
69  * wrapper sinh(x)
70  */
71 
72 #include "fdlibm.h"
73 #include <errno.h>
74 
75 #ifndef _DOUBLE_IS_32BITS
76 
77 #ifdef __STDC__
sinh(double x)78 	double sinh(double x)		/* wrapper sinh */
79 #else
80 	double sinh(x)			/* wrapper sinh */
81 	double x;
82 #endif
83 {
84 #ifdef _IEEE_LIBM
85 	return __ieee754_sinh(x);
86 #else
87 	double z;
88 	struct exception exc;
89 	z = __ieee754_sinh(x);
90 	if(_LIB_VERSION == _IEEE_) return z;
91 	if(!finite(z)&&finite(x)) {
92 	    /* sinh(finite) overflow */
93 #ifndef HUGE_VAL
94 #define HUGE_VAL inf
95 	    double inf = 0.0;
96 
97 	    SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
98 #endif
99 	    exc.type = OVERFLOW;
100 	    exc.name = "sinh";
101 	    exc.err = 0;
102 	    exc.arg1 = exc.arg2 = x;
103 	    if (_LIB_VERSION == _SVID_)
104 	       exc.retval = ( (x>0.0) ? HUGE : -HUGE);
105 	    else
106 	       exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL);
107 	    if (_LIB_VERSION == _POSIX_)
108 	       errno = ERANGE;
109 	    else if (!matherr(&exc)) {
110 	       errno = ERANGE;
111 	    }
112 	    if (exc.err != 0)
113 	       errno = exc.err;
114             return exc.retval;
115 	} else
116 	    return z;
117 #endif
118 }
119 
120 #endif /* defined(_DOUBLE_IS_32BITS) */
121