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NetBSD/include/math.h
bjh21 4be7a2dcf3 Add a new feature-test macro, _NETBSD_SOURCE. If this is defined 
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.
<sys/featuretest.h> defined _NETBSD_SOURCE if none of _ANSI_SOURCE,
_POSIX_C_SOURCE and _XOPEN_SOURCE is defined, so as to preserve
existing behaviour.

This has two major advantages:
+ Programs that require non-POSIX facilities but define _POSIX_C_SOURCE
  can trivially be overruled by putting -D_NETBSD_SOURCE in their CFLAGS.
+ It makes most of the #ifs simpler, in that they're all now ORs of the
  various macros, rather than having checks for (!defined(_ANSI_SOURCE) ||
  !defined(_POSIX_C_SOURCE) || !defined(_XOPEN_SOURCE)) all over the place.

I've tried not to change the semantics of the headers in any case where
_NETBSD_SOURCE wasn't defined, but there were some places where the
current semantics were clearly mad, and retaining them was harder than
correcting them.  In particular, I've mostly normalised things so that
_ANSI_SOURCE gets you the smallest set of stuff, then _POSIX_C_SOURCE,
_XOPEN_SOURCE and _NETBSD_SOURCE in that order.

Tested by building for vax, encouraged by thorpej, and uncontested in
tech-userlevel for a week.
2003-04-28 23:16:11 +00:00

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/* $NetBSD: math.h,v 1.25 2003/04/28 23:16:13 bjh21 Exp $ */
/*
* ====================================================
* 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.
* ====================================================
*/
/*
* @(#)fdlibm.h 5.1 93/09/24
*/
#ifndef _MATH_H_
#define _MATH_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
union __float_u {
unsigned char __dummy[sizeof(float)];
float __val;
};
union __double_u {
unsigned char __dummy[sizeof(double)];
double __val;
};
#include <machine/math.h> /* may use __float_u or __double_u */
/*
* ANSI/POSIX
*/
extern __const union __double_u __infinity;
#define HUGE_VAL __infinity.__val
/*
* ISO C99
*/
#if defined(__HAVE_NANF) && \
(!defined(_ANSI_SOURCE) && \
(defined(_ISOC99_SOURCE) || (__STDC_VERSION__ - 0) >= 199901L || \
defined(_NETBSD_SOURCE)))
extern __const union __float_u __nanf;
#define NAN __nanf.__val
#endif /* __HAVE_NANF && (!_ANSI_SOURCE && ....) */
/*
* XOPEN/SVID
*/
#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
#define M_E 2.7182818284590452354 /* e */
#define M_LOG2E 1.4426950408889634074 /* log 2e */
#define M_LOG10E 0.43429448190325182765 /* log 10e */
#define M_LN2 0.69314718055994530942 /* log e2 */
#define M_LN10 2.30258509299404568402 /* log e10 */
#define M_PI 3.14159265358979323846 /* pi */
#define M_PI_2 1.57079632679489661923 /* pi/2 */
#define M_PI_4 0.78539816339744830962 /* pi/4 */
#define M_1_PI 0.31830988618379067154 /* 1/pi */
#define M_2_PI 0.63661977236758134308 /* 2/pi */
#define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */
#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
#define MAXFLOAT ((float)3.40282346638528860e+38)
extern int signgam;
#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
#if defined(_NETBSD_SOURCE)
enum fdversion {fdlibm_ieee = -1, fdlibm_svid, fdlibm_xopen, fdlibm_posix};
#define _LIB_VERSION_TYPE enum fdversion
#define _LIB_VERSION _fdlib_version
/* if global variable _LIB_VERSION is not desirable, one may
* change the following to be a constant by:
* #define _LIB_VERSION_TYPE const enum version
* In that case, after one initializes the value _LIB_VERSION (see
* s_lib_version.c) during compile time, it cannot be modified
* in the middle of a program
*/
extern _LIB_VERSION_TYPE _LIB_VERSION;
#define _IEEE_ fdlibm_ieee
#define _SVID_ fdlibm_svid
#define _XOPEN_ fdlibm_xopen
#define _POSIX_ fdlibm_posix
#ifndef __cplusplus
struct exception {
int type;
char *name;
double arg1;
double arg2;
double retval;
};
#endif
#define HUGE MAXFLOAT
/*
* set X_TLOSS = pi*2**52, which is possibly defined in <values.h>
* (one may replace the following line by "#include <values.h>")
*/
#define X_TLOSS 1.41484755040568800000e+16
#define DOMAIN 1
#define SING 2
#define OVERFLOW 3
#define UNDERFLOW 4
#define TLOSS 5
#define PLOSS 6
#endif /* _NETBSD_SOURCE */
__BEGIN_DECLS
/*
* ANSI/POSIX
*/
double acos __P((double));
double asin __P((double));
double atan __P((double));
double atan2 __P((double, double));
double cos __P((double));
double sin __P((double));
double tan __P((double));
double cosh __P((double));
double sinh __P((double));
double tanh __P((double));
double exp __P((double));
double frexp __P((double, int *));
double ldexp __P((double, int));
double log __P((double));
double log10 __P((double));
double modf __P((double, double *));
double pow __P((double, double));
double sqrt __P((double));
double ceil __P((double));
double fabs __P((double));
double floor __P((double));
double fmod __P((double, double));
#if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
double erf __P((double));
double erfc __P((double));
double gamma __P((double));
double hypot __P((double, double));
int isnan __P((double));
int finite __P((double));
double j0 __P((double));
double j1 __P((double));
double jn __P((int, double));
double lgamma __P((double));
double y0 __P((double));
double y1 __P((double));
double yn __P((int, double));
#if (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
double acosh __P((double));
double asinh __P((double));
double atanh __P((double));
double cbrt __P((double));
double expm1 __P((double));
int ilogb __P((double));
double log1p __P((double));
double logb __P((double));
double nextafter __P((double, double));
double remainder __P((double, double));
double rint __P((double));
double scalb __P((double, double));
#endif /* (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)*/
#endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
#if defined(_NETBSD_SOURCE)
#ifndef __cplusplus
int matherr __P((struct exception *));
#endif
/*
* IEEE Test Vector
*/
double significand __P((double));
/*
* Functions callable from C, intended to support IEEE arithmetic.
*/
double copysign __P((double, double));
double scalbn __P((double, int));
/*
* BSD math library entry points
*/
#ifndef __MATH_PRIVATE__
double cabs __P((/* struct complex { double r; double i; } */));
#endif
double drem __P((double, double));
#endif /* _NETBSD_SOURCE */
#if defined(_NETBSD_SOURCE) || defined(_REENTRANT)
/*
* Reentrant version of gamma & lgamma; passes signgam back by reference
* as the second argument; user must allocate space for signgam.
*/
double gamma_r __P((double, int *));
double lgamma_r __P((double, int *));
#endif /* _NETBSD_SOURCE || _REENTRANT */
#if defined(_NETBSD_SOURCE)
int isinf __P((double));
/* float versions of ANSI/POSIX functions */
float acosf __P((float));
float asinf __P((float));
float atanf __P((float));
float atan2f __P((float, float));
float cosf __P((float));
float sinf __P((float));
float tanf __P((float));
float coshf __P((float));
float sinhf __P((float));
float tanhf __P((float));
float expf __P((float));
float frexpf __P((float, int *));
float ldexpf __P((float, int));
float logf __P((float));
float log10f __P((float));
float modff __P((float, float *));
float powf __P((float, float));
float sqrtf __P((float));
float ceilf __P((float));
float fabsf __P((float));
float floorf __P((float));
float fmodf __P((float, float));
float erff __P((float));
float erfcf __P((float));
float gammaf __P((float));
float hypotf __P((float, float));
int isinff __P((float));
int isnanf __P((float));
int finitef __P((float));
float j0f __P((float));
float j1f __P((float));
float jnf __P((int, float));
float lgammaf __P((float));
float y0f __P((float));
float y1f __P((float));
float ynf __P((int, float));
float acoshf __P((float));
float asinhf __P((float));
float atanhf __P((float));
float cbrtf __P((float));
float logbf __P((float));
float nextafterf __P((float, float));
float remainderf __P((float, float));
float scalbf __P((float, float));
/*
* float version of IEEE Test Vector
*/
float significandf __P((float));
/*
* Float versions of functions callable from C, intended to support
* IEEE arithmetic.
*/
float copysignf __P((float, float));
int ilogbf __P((float));
float rintf __P((float));
float scalbnf __P((float, int));
/*
* float versions of BSD math library entry points
*/
#ifndef __MATH_PRIVATE__
float cabsf __P((/* struct complex { float r; float i; } */));
#endif
float dremf __P((float, float));
float expm1f __P((float));
float log1pf __P((float));
#endif /* _NETBSD_SOURCE */
#if defined(_NETBSD_SOURCE) || defined(_REENTRANT)
/*
* Float versions of reentrant version of gamma & lgamma; passes
* signgam back by reference as the second argument; user must
* allocate space for signgam.
*/
float gammaf_r __P((float, int *));
float lgammaf_r __P((float, int *));
#endif /* !... || _REENTRANT */
__END_DECLS
#endif /* _MATH_H_ */
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