k_standard.c

标准c库代码,可以应用于各个系统提供了大量的基本函数

/* @(#)k_standard.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.
 * ====================================================
 *
 */

#include "fdlibm.h"
#include <errno.h>

#ifndef _USE_WRITE
#include <stdio.h>			/* fputs(), stderr */
#define	WRITE2(u,v)	fputs(u, _stderr_r(p))
#else	/* !defined(_USE_WRITE) */
#include <unistd.h>			/* write */
#define	WRITE2(u,v)	_write_r(p, 2, u, v)
#undef fflush
#endif	/* !defined(_USE_WRITE) */

#ifdef __STDC__
static const double zero = 0.0;	/* used as const */
#else
static double zero = 0.0;	/* used as const */
#endif

/* 
 * Standard conformance (non-IEEE) on exception cases.
 * Mapping:
 *	1 -- acos(|x|>1)
 *	2 -- asin(|x|>1)
 *	3 -- atan2(+-0,+-0)
 *	4 -- hypot overflow
 *	5 -- cosh overflow
 *	6 -- exp overflow
 *	7 -- exp underflow
 *	8 -- y0(0)
 *	9 -- y0(-ve)
 *	10-- y1(0)
 *	11-- y1(-ve)
 *	12-- yn(0)
 *	13-- yn(-ve)
 *	14-- lgamma(finite) overflow
 *	15-- lgamma(-integer)
 *	16-- log(0)
 *	17-- log(x<0)
 *	18-- log10(0)
 *	19-- log10(x<0)
 *	20-- pow(0.0,0.0)
 *	21-- pow(x,y) overflow
 *	22-- pow(x,y) underflow
 *	23-- pow(0,negative) 
 *	24-- pow(neg,non-integral)
 *	25-- sinh(finite) overflow
 *	26-- sqrt(negative)
 *      27-- fmod(x,0)
 *      28-- remainder(x,0)
 *	29-- acosh(x<1)
 *	30-- atanh(|x|>1)
 *	31-- atanh(|x|=1)
 *	32-- scalb overflow
 *	33-- scalb underflow
 *	34-- j0(|x|>X_TLOSS)
 *	35-- y0(x>X_TLOSS)
 *	36-- j1(|x|>X_TLOSS)
 *	37-- y1(x>X_TLOSS)
 *	38-- jn(|x|>X_TLOSS, n)
 *	39-- yn(x>X_TLOSS, n)
 *	40-- gamma(finite) overflow
 *	41-- gamma(-integer)
 *	42-- pow(NaN,0.0)
 */


#ifdef __STDC__
	double __kernel_standard(struct _reent *p, double x, double y,
				 int type) 
#else
	double __kernel_standard(p,x,y,type) 
	struct _reent *p; double x,y; int type;
#endif
{
	struct exception exc;
#ifndef HUGE_VAL	/* this is the only routine that uses HUGE_VAL */ 
#define HUGE_VAL inf
	double inf = 0.0;

	SET_HIGH_WORD(inf,0x7ff00000);	/* set inf to infinite */
#endif

#ifdef _USE_WRITE
	(void) fflush(_stdout_r(p));
#endif
	exc.arg1 = x;
	exc.arg2 = y;
	exc.err = 0;
	switch(type) {
	    case 1:
	    case 101:
		/* acos(|x|>1) */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "acos" : "acosf";
		exc.retval = zero;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
		    (void) WRITE2("acos: DOMAIN error\n", 19);
		  }
		  p->_errno = EDOM;
		}
		break;
	    case 2:
	    case 102:
		/* asin(|x|>1) */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "asin" : "asinf";
		exc.retval = zero;
		if(_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
		    	(void) WRITE2("asin: DOMAIN error\n", 19);
		  }
		  p->_errno = EDOM;
		}
		break;
	    case 3:
	    case 103:
		/* atan2(+-0,+-0) */
		exc.arg1 = y;
		exc.arg2 = x;
		exc.type = DOMAIN;
		exc.name = type < 100 ? "atan2" : "atan2f";
		exc.retval = zero;
		if(_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
			(void) WRITE2("atan2: DOMAIN error\n", 20);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 4:
	    case 104:
		/* hypot(finite,finite) overflow */
		exc.type = OVERFLOW;
		exc.name = type < 100 ? "hypot" : "hypotf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = HUGE;
		else
		  exc.retval = HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = ERANGE;
		else if (!matherr(&exc)) {
			p->_errno = ERANGE;
		}
		break;
	    case 5:
	    case 105:
		/* cosh(finite) overflow */
		exc.type = OVERFLOW;
		exc.name = type < 100 ? "cosh" : "coshf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = HUGE;
		else
		  exc.retval = HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = ERANGE;
		else if (!matherr(&exc)) {
			p->_errno = ERANGE;
		}
		break;
	    case 6:
	    case 106:
		/* exp(finite) overflow */
		exc.type = OVERFLOW;
		exc.name = type < 100 ? "exp" : "expf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = HUGE;
		else
		  exc.retval = HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = ERANGE;
		else if (!matherr(&exc)) {
			p->_errno = ERANGE;
		}
		break;
	    case 7:
	    case 107:
		/* exp(finite) underflow */
		exc.type = UNDERFLOW;
		exc.name = type < 100 ? "exp" : "expf";
		exc.retval = zero;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = ERANGE;
		else if (!matherr(&exc)) {
			p->_errno = ERANGE;
		}
		break;
	    case 8:
	    case 108:
		/* y0(0) = -inf */
		exc.type = DOMAIN;	/* should be SING for IEEE */
		exc.name = type < 100 ? "y0" : "y0f";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y0: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 9:
	    case 109:
		/* y0(x<0) = NaN */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "y0" : "y0f";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y0: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 10:
	    case 110:
		/* y1(0) = -inf */
		exc.type = DOMAIN;	/* should be SING for IEEE */
		exc.name = type < 100 ? "y1" : "y1f";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y1: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 11:
	    case 111:
		/* y1(x<0) = NaN */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "y1" : "y1f";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y1: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 12:
	    case 112:
		/* yn(n,0) = -inf */
		exc.type = DOMAIN;	/* should be SING for IEEE */
		exc.name = type < 100 ? "yn" : "ynf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("yn: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 13:
	    case 113:
		/* yn(x<0) = NaN */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "yn" : "ynf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("yn: DOMAIN error\n", 17);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 14:
	    case 114:
		/* lgamma(finite) overflow */
		exc.type = OVERFLOW;
		exc.name = type < 100 ? "lgamma" : "lgammaf";
                if (_LIB_VERSION == _SVID_)
                  exc.retval = HUGE;
                else
                  exc.retval = HUGE_VAL;
                if (_LIB_VERSION == _POSIX_)
			p->_errno = ERANGE;
                else if (!matherr(&exc)) {
                        p->_errno = ERANGE;
		}
		break;
	    case 15:
	    case 115:
		/* lgamma(-integer) or lgamma(0) */
		exc.type = SING;
		exc.name = type < 100 ? "lgamma" : "lgammaf";
                if (_LIB_VERSION == _SVID_)
                  exc.retval = HUGE;
                else
                  exc.retval = HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("lgamma: SING error\n", 19);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 16:
	    case 116:
		/* log(0) */
		exc.type = SING;
		exc.name = type < 100 ? "log" : "logf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = ERANGE;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("log: SING error\n", 16);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 17:
	    case 117:
		/* log(x<0) */
		exc.type = DOMAIN;
		exc.name = type < 100 ? "log" : "logf";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else
		  exc.retval = -HUGE_VAL;
		if (_LIB_VERSION == _POSIX_)
		  p->_errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("log: DOMAIN error\n", 18);
		      }
		  p->_errno = EDOM;
		}
		break;
	    case 18:
	    case 118:
		/* log10(0) */
		exc.type = SING;
		exc.name = type < 100 ? "log10" : "log10f";
		if (_LIB_VERSION == _SVID_)
		  exc.retval = -HUGE;
		else