math.h revision 1.8 
1/*	$OpenBSD: math.h,v 1.8 2003/06/26 22:40:27 jason Exp $	*/
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/*
14 * from: @(#)fdlibm.h 5.1 93/09/24
15 */
16
17#ifndef _MATH_H_
18#define _MATH_H_
19
20/*
21 * ANSI/POSIX
22 */
23extern char __infinity[];
24#define HUGE_VAL	(*(double *) __infinity)
25
26/*
27 * XOPEN/SVID
28 */
29#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
30#define	M_E		2.7182818284590452354	/* e */
31#define	M_LOG2E		1.4426950408889634074	/* log 2e */
32#define	M_LOG10E	0.43429448190325182765	/* log 10e */
33#define	M_LN2		0.69314718055994530942	/* log e2 */
34#define	M_LN10		2.30258509299404568402	/* log e10 */
35#define	M_PI		3.14159265358979323846	/* pi */
36#define	M_PI_2		1.57079632679489661923	/* pi/2 */
37#define	M_PI_4		0.78539816339744830962	/* pi/4 */
38#define	M_1_PI		0.31830988618379067154	/* 1/pi */
39#define	M_2_PI		0.63661977236758134308	/* 2/pi */
40#define	M_2_SQRTPI	1.12837916709551257390	/* 2/sqrt(pi) */
41#define	M_SQRT2		1.41421356237309504880	/* sqrt(2) */
42#define	M_SQRT1_2	0.70710678118654752440	/* 1/sqrt(2) */
43
44#ifdef __vax__
45#define	MAXFLOAT        ((float)1.70141173319264430e+38)
46#else
47#define	MAXFLOAT	((float)3.40282346638528860e+38)
48#endif
49
50extern int signgam;
51
52#if !defined(_XOPEN_SOURCE)
53enum fdversion {fdlibm_ieee = -1, fdlibm_svid, fdlibm_xopen, fdlibm_posix};
54
55#define _LIB_VERSION_TYPE enum fdversion
56#define _LIB_VERSION _fdlib_version
57
58/* if global variable _LIB_VERSION is not desirable, one may
59 * change the following to be a constant by:
60 *	#define _LIB_VERSION_TYPE const enum version
61 * In that case, after one initializes the value _LIB_VERSION (see
62 * s_lib_version.c) during compile time, it cannot be modified
63 * in the middle of a program
64 */
65extern  _LIB_VERSION_TYPE  _LIB_VERSION;
66
67#define _IEEE_  fdlibm_ieee
68#define _SVID_  fdlibm_svid
69#define _XOPEN_ fdlibm_xopen
70#define _POSIX_ fdlibm_posix
71
72#ifndef __cplusplus
73struct exception {
74	int type;
75	char *name;
76	double arg1;
77	double arg2;
78	double retval;
79};
80#endif
81
82#define	HUGE		MAXFLOAT
83
84/*
85 * set X_TLOSS = pi*2**52, which is possibly defined in <values.h>
86 * (one may replace the following line by "#include <values.h>")
87 */
88
89#define X_TLOSS		1.41484755040568800000e+16
90
91#define	DOMAIN		1
92#define	SING		2
93#define	OVERFLOW	3
94#define	UNDERFLOW	4
95#define	TLOSS		5
96#define	PLOSS		6
97
98#endif /* !_XOPEN_SOURCE */
99#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
100
101
102#include <sys/cdefs.h>
103__BEGIN_DECLS
104/*
105 * ANSI/POSIX
106 */
107extern double acos(double);
108extern double asin(double);
109extern double atan(double);
110extern double atan2(double, double);
111extern double cos(double);
112extern double sin(double);
113extern double tan(double);
114
115extern double cosh(double);
116extern double sinh(double);
117extern double tanh(double);
118
119extern double exp(double);
120extern double frexp(double, int *);
121extern double ldexp(double, int);
122extern double log(double);
123extern double log10(double);
124extern double modf(double, double *);
125
126extern double pow(double, double);
127extern double sqrt(double);
128
129extern double ceil(double);
130extern double fabs(double);
131extern double floor(double);
132extern double fmod(double, double);
133
134#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
135extern double erf(double);
136extern double erfc(double);
137extern double gamma(double);
138extern double hypot(double, double);
139extern int isinf(double);
140extern int isnan(double);
141extern int finite(double);
142extern double j0(double);
143extern double j1(double);
144extern double jn(int, double);
145extern double lgamma(double);
146extern double y0(double);
147extern double y1(double);
148extern double yn(int, double);
149
150#if !defined(_XOPEN_SOURCE)
151extern double acosh(double);
152extern double asinh(double);
153extern double atanh(double);
154extern double cbrt(double);
155extern double logb(double);
156extern double nextafter(double, double);
157extern double remainder(double, double);
158extern double scalb(double, double);
159
160#ifdef __LIBM_PRIVATE
161extern int matherr(struct exception *);
162#endif
163
164/*
165 * IEEE Test Vector
166 */
167extern double significand(double);
168
169/*
170 * Functions callable from C, intended to support IEEE arithmetic.
171 */
172extern double copysign(double, double);
173extern int ilogb(double);
174extern double rint(double);
175extern double scalbn(double, int);
176
177/*
178 * BSD math library entry points
179 */
180extern double cabs();
181extern double drem(double, double);
182extern double expm1(double);
183extern double log1p(double);
184
185/*
186 * Reentrant version of gamma & lgamma; passes signgam back by reference
187 * as the second argument; user must allocate space for signgam.
188 */
189#ifdef _REENTRANT
190extern double gamma_r(double, int *);
191extern double lgamma_r(double, int *);
192#endif /* _REENTRANT */
193
194
195/* float versions of ANSI/POSIX functions */
196extern float acosf(float);
197extern float asinf(float);
198extern float atanf(float);
199extern float atan2f(float, float);
200extern float cosf(float);
201extern float sinf(float);
202extern float tanf(float);
203
204extern float coshf(float);
205extern float sinhf(float);
206extern float tanhf(float);
207
208extern float expf(float);
209extern float frexpf(float, int *);
210extern float ldexpf(float, int);
211extern float logf(float);
212extern float log10f(float);
213extern float modff(float, float *);
214
215extern float powf(float, float);
216extern float sqrtf(float);
217
218extern float ceilf(float);
219extern float fabsf(float);
220extern float floorf(float);
221extern float fmodf(float, float);
222
223extern float erff(float);
224extern float erfcf(float);
225extern float gammaf(float);
226extern float hypotf(float, float);
227extern int isinff(float);
228extern int isnanf(float);
229extern int finitef(float);
230extern float j0f(float);
231extern float j1f(float);
232extern float jnf(int, float);
233extern float lgammaf(float);
234extern float y0f(float);
235extern float y1f(float);
236extern float ynf(int, float);
237
238extern float acoshf(float);
239extern float asinhf(float);
240extern float atanhf(float);
241extern float cbrtf(float);
242extern float logbf(float);
243extern float nextafterf(float, float);
244extern float remainderf(float, float);
245extern float scalbf(float, float);
246
247/*
248 * float version of IEEE Test Vector
249 */
250extern float significandf(float);
251
252/*
253 * Float versions of functions callable from C, intended to support
254 * IEEE arithmetic.
255 */
256extern float copysignf(float, float);
257extern int ilogbf(float);
258extern float rintf(float);
259extern float scalbnf(float, int);
260
261/*
262 * float versions of BSD math library entry points
263 */
264extern float cabsf ();
265extern float dremf(float, float);
266extern float expm1f(float);
267extern float log1pf(float);
268
269/*
270 * Float versions of reentrant version of gamma & lgamma; passes
271 * signgam back by reference as the second argument; user must
272 * allocate space for signgam.
273 */
274#ifdef _REENTRANT
275extern float gammaf_r(float, int *);
276extern float lgammaf_r(float, int *);
277#endif	/* _REENTRANT */
278
279#endif /* !_XOPEN_SOURCE */
280#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */
281__END_DECLS
282
283#endif /* _MATH_H_ */
284