k_standa.c

这是一个符合posix.13 pse51的实时内核

/* Project: 	HARTIK 3.0      				*/
/* Description: Hard Real TIme Kernel for 386 & higher machines */
/* Author:	Gerardo Lamastra				*/
/* Date:	9/5/96 						*/
/* Revision:	Beta 1.0					*/

/* File: K_Standa.C		*/
/* X standard library 	  	*/
/* Math error handling!		*/

/* The standard GNU C v2.8.0 source code patched to run within HARTIK */

/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
/* @(#)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.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$Id: k_standa.c,v 1.2 1999/04/29 09:44:09 massy Exp $";
#endif

#include <math.h>
#include <errno.h>
#include "math_pri.h"

/*
 * Predefined _LIB_VERSION value is _SVID_ in order to output
 * math errors through cprintf!
 * Change it to _POSIX_ if you want Std posix error handling (through errno!)
 */
int _LIB_VERSION = _SVID_;

#ifndef HUGE 
#define HUGE HUGE_VAL
#endif

#ifndef _USE_WRITE
#include <stdio.h>			/* fputs(), stderr */
#define	WRITE2(u,v)	cprintf(u)
#else	/* !defined(_USE_WRITE) */
#include <unistd.h>			/* write */
#define	WRITE2(u,v)	write(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(double x, double y, int type) 
#else
	double __kernel_standard(x,y,type) 
	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);
#endif
	exc.arg1 = x;
	exc.arg2 = y;
	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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
		    (void) WRITE2("acos: DOMAIN error\n", 19);
		  }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
		    	(void) WRITE2("asin: DOMAIN error\n", 19);
		  }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if(_LIB_VERSION == _SVID_) {
			(void) WRITE2("atan2: DOMAIN error\n", 20);
		      }
		  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_)
		  errno = ERANGE;
		else if (!matherr(&exc)) {
			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_)
		  errno = ERANGE;
		else if (!matherr(&exc)) {
			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_)
		  errno = ERANGE;
		else if (!matherr(&exc)) {
			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_)
		  errno = ERANGE;
		else if (!matherr(&exc)) {
			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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y0: DOMAIN error\n", 17);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y0: DOMAIN error\n", 17);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y1: DOMAIN error\n", 17);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("y1: DOMAIN error\n", 17);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("yn: DOMAIN error\n", 17);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("yn: DOMAIN error\n", 17);
		      }
		  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_)
			errno = ERANGE;
                else if (!matherr(&exc)) {
                        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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("lgamma: SING error\n", 19);
		      }
		  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_)
		  errno = ERANGE;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {
			(void) WRITE2("log: SING error\n", 16);
		      }
		  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_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  if (_LIB_VERSION == _SVID_) {