standard.c

eCos1.31版

//===========================================================================
//
//      signgam.cxx
//
//      Support sign of the gamma*() functions in Math library
//
//===========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   jlarmour
// Contributors:  jlarmour
// Date:        1998-02-13
// Purpose:     
// Description: Contains the accessor functions to get and set the stored sign
//              of the gamma*() functions in the math library
// Usage:       
//
//####DESCRIPTIONEND####
//
//===========================================================================

/* @(#)k_standard.c 1.3 95/01/18 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunSoft, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 *
 */

// CONFIGURATION

#include <pkgconf/libm.h>   // Configuration header

// Include the Math library?
#ifdef CYGPKG_LIBM

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support
#include <cyg/infra/cyg_trac.h>    // Tracing macros

#include <math.h>                  // Main header for math library
#include "mathincl/fdlibm.h"       // Internal header for math library

#include <cyg/error/codes.h>       // standard error codes

#ifndef CYGSEM_LIBM_COMPAT_IEEE_ONLY
#include <errno.h>
#else
static int errno; // this whole file won't be used if we're IEEE only, but
                  // doing this keeps the compiler happy
#endif

#ifdef CYGSEM_LIBM_USE_STDERR

#include <stdio.h>
#define WRITE2(u,v)     fputs(u, stderr)

#else

#define WRITE2(u,v)     0

#endif // ifdef CYGSEM_LIBM_USE_STDERR


// GLOBALS

static const double zero = 0.0;

// FUNCTIONS

/* 
 * 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)
 *      43-- ldexp overflow
 *      44-- ldexp underflow
 */


double
__kernel_standard(double x, double y, int type) 
{
        struct exception exc;

#ifdef CYGSEM_LIBM_USE_STDERR
        (void) fflush(stdout);
#endif
        exc.arg1 = x;
        exc.arg2 = y;
        switch(type) {
            case 1:
                /* acos(|x|>1) */
                exc.type = DOMAIN;
                exc.name = "acos";
                exc.retval = zero;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID) {
                    (void) WRITE2("acos: DOMAIN error\n", 19);
                  }
                  errno = EDOM;
                }
                break;
            case 2:
                /* asin(|x|>1) */
                exc.type = DOMAIN;
                exc.name = "asin";
                exc.retval = zero;
                if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID) {
                        (void) WRITE2("asin: DOMAIN error\n", 19);
                  }
                  errno = EDOM;
                }
                break;
            case 3:
                /* atan2(+-0,+-0) */
                exc.arg1 = y;
                exc.arg2 = x;
                exc.type = DOMAIN;
                exc.name = "atan2";
                exc.retval = zero;
                if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID) {
                        (void) WRITE2("atan2: DOMAIN error\n", 20);
                      }
                  errno = EDOM;
                }
                break;
            case 4:
                /* hypot(finite,finite) overflow */
                exc.type = OVERFLOW;
                exc.name = "hypot";
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID)
                  exc.retval = HUGE;
                else
                  exc.retval = HUGE_VAL;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = ERANGE;
                else if (!matherr(&exc)) {
                        errno = ERANGE;
                }
                break;
            case 5:
                /* cosh(finite) overflow */
                exc.type = OVERFLOW;
                exc.name = "cosh";
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID)
                  exc.retval = HUGE;
                else
                  exc.retval = HUGE_VAL;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = ERANGE;
                else if (!matherr(&exc)) {
                        errno = ERANGE;
                }
                break;
            case 6:
                /* exp(finite) overflow */
                exc.type = OVERFLOW;
                exc.name = "exp";
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID)
                  exc.retval = HUGE;
                else
                  exc.retval = HUGE_VAL;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = ERANGE;
                else if (!matherr(&exc)) {
                        errno = ERANGE;
                }
                break;
            case 7:
                /* exp(finite) underflow */
                exc.type = UNDERFLOW;
                exc.name = "exp";
                exc.retval = zero;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = ERANGE;
                else if (!matherr(&exc)) {
                        errno = ERANGE;
                }
                break;
            case 8:
                /* y0(0) = -inf */
                exc.type = DOMAIN;      /* should be SING for IEEE */
                exc.name = "y0";
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID)
                  exc.retval = -HUGE;
                else
                  exc.retval = -HUGE_VAL;
                if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_POSIX)
                  errno = EDOM;
                else if (!matherr(&exc)) {
                  if (cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_SVID) {
                        (void) WRITE2("y0: DOMAIN error\n", 17);
                      }
                  errno = EDOM;
                }
                break;