ref: 1335a57865c1a966a58437779d15aa63a775d64e
dir: /sys/src/cmd/python/Modules/fpetestmodule.c/
/*
---------------------------------------------------------------------
/ Copyright (c) 1996. \
| The Regents of the University of California. |
| All rights reserved. |
| |
| Permission to use, copy, modify, and distribute this software for |
| any purpose without fee is hereby granted, provided that this en- |
| tire notice is included in all copies of any software which is or |
| includes a copy or modification of this software and in all |
| copies of the supporting documentation for such software. |
| |
| This work was produced at the University of California, Lawrence |
| Livermore National Laboratory under contract no. W-7405-ENG-48 |
| between the U.S. Department of Energy and The Regents of the |
| University of California for the operation of UC LLNL. |
| |
| DISCLAIMER |
| |
| This software was prepared as an account of work sponsored by an |
| agency of the United States Government. Neither the United States |
| Government nor the University of California nor any of their em- |
| ployees, makes any warranty, express or implied, or assumes any |
| liability or responsibility for the accuracy, completeness, or |
| usefulness of any information, apparatus, product, or process |
| disclosed, or represents that its use would not infringe |
| privately-owned rights. Reference herein to any specific commer- |
| cial products, process, or service by trade name, trademark, |
| manufacturer, or otherwise, does not necessarily constitute or |
| imply its endorsement, recommendation, or favoring by the United |
| States Government or the University of California. The views and |
| opinions of authors expressed herein do not necessarily state or |
| reflect those of the United States Government or the University |
| of California, and shall not be used for advertising or product |
\ endorsement purposes. /
---------------------------------------------------------------------
*/
/*
Floating point exception test module.
*/
#include "Python.h"
static PyObject *fpe_error;
PyMODINIT_FUNC initfpetest(void);
static PyObject *test(PyObject *self,PyObject *args);
static double db0(double);
static double overflow(double);
static double nest1(int, double);
static double nest2(int, double);
static double nest3(double);
static void printerr(double);
static PyMethodDef fpetest_methods[] = {
{"test", (PyCFunction) test, METH_VARARGS},
{0,0}
};
static PyObject *test(PyObject *self,PyObject *args)
{
double r;
fprintf(stderr,"overflow");
r = overflow(1.e160);
printerr(r);
fprintf(stderr,"\ndiv by 0");
r = db0(0.0);
printerr(r);
fprintf(stderr,"\nnested outer");
r = nest1(0, 0.0);
printerr(r);
fprintf(stderr,"\nnested inner");
r = nest1(1, 1.0);
printerr(r);
fprintf(stderr,"\ntrailing outer");
r = nest1(2, 2.0);
printerr(r);
fprintf(stderr,"\nnested prior");
r = nest2(0, 0.0);
printerr(r);
fprintf(stderr,"\nnested interior");
r = nest2(1, 1.0);
printerr(r);
fprintf(stderr,"\nnested trailing");
r = nest2(2, 2.0);
printerr(r);
Py_INCREF (Py_None);
return Py_None;
}
static void printerr(double r)
{
if(r == 3.1416){
fprintf(stderr,"\tPASS\n");
PyErr_Print();
}else{
fprintf(stderr,"\tFAIL\n");
}
PyErr_Clear();
}
static double nest1(int i, double x)
{
double a = 1.0;
PyFPE_START_PROTECT("Division by zero, outer zone", return 3.1416)
if(i == 0){
a = 1./x;
}else if(i == 1){
/* This (following) message is never seen. */
PyFPE_START_PROTECT("Division by zero, inner zone", return 3.1416)
a = 1./(1. - x);
PyFPE_END_PROTECT(a)
}else if(i == 2){
a = 1./(2. - x);
}
PyFPE_END_PROTECT(a)
return a;
}
static double nest2(int i, double x)
{
double a = 1.0;
PyFPE_START_PROTECT("Division by zero, prior error", return 3.1416)
if(i == 0){
a = 1./x;
}else if(i == 1){
a = nest3(x);
}else if(i == 2){
a = 1./(2. - x);
}
PyFPE_END_PROTECT(a)
return a;
}
static double nest3(double x)
{
double result;
/* This (following) message is never seen. */
PyFPE_START_PROTECT("Division by zero, nest3 error", return 3.1416)
result = 1./(1. - x);
PyFPE_END_PROTECT(result)
return result;
}
static double db0(double x)
{
double a;
PyFPE_START_PROTECT("Division by zero", return 3.1416)
a = 1./x;
PyFPE_END_PROTECT(a)
return a;
}
static double overflow(double b)
{
double a;
PyFPE_START_PROTECT("Overflow", return 3.1416)
a = b*b;
PyFPE_END_PROTECT(a)
return a;
}
PyMODINIT_FUNC initfpetest(void)
{
PyObject *m, *d;
m = Py_InitModule("fpetest", fpetest_methods);
if (m == NULL)
return;
d = PyModule_GetDict(m);
fpe_error = PyErr_NewException("fpetest.error", NULL, NULL);
if (fpe_error != NULL)
PyDict_SetItemString(d, "error", fpe_error);
}