/* Copyright (C) 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Andreas Jaeger <aj@suse.de>, 1999. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <math.h> #include <float.h> #include <stdio.h> static int errors = 0; static void check (const char *testname, int result) { if (!result) { printf ("Failure: %s\n", testname); errors++; } } #define TEST_FUNC(NAME, FLOAT, NANFUNC, EPSILON, HUGEVAL) \ static void \ NAME (void) \ { \ /* Variables are declared volatile to forbid some compiler \ optimizations. */ \ volatile FLOAT Inf_var, NaN_var, zero_var, one_var; \ FLOAT x1, x2; \ \ zero_var = 0.0; \ one_var = 1.0; \ NaN_var = zero_var/zero_var; \ Inf_var = one_var / zero_var; \ \ (void) &zero_var; \ (void) &one_var; \ (void) &NaN_var; \ (void) &Inf_var; \ \ \ check (#FLOAT " isinf (inf) == 1", isinf (Inf_var) == 1); \ check (#FLOAT " isinf (-inf) == -1", isinf (-Inf_var) == -1); \ check (#FLOAT " !isinf (1)", !(isinf (one_var))); \ check (#FLOAT " !isinf (NaN)", !(isinf (NaN_var))); \ \ check (#FLOAT " isnan (NaN)", isnan (NaN_var)); \ check (#FLOAT " isnan (-NaN)", isnan (-NaN_var)); \ check (#FLOAT " !isnan (1)", !(isnan (one_var))); \ check (#FLOAT " !isnan (inf)", !(isnan (Inf_var))); \ \ check (#FLOAT " inf == inf", Inf_var == Inf_var); \ check (#FLOAT " -inf == -inf", -Inf_var == -Inf_var); \ check (#FLOAT " inf != -inf", Inf_var != -Inf_var); \ check (#FLOAT " NaN != NaN", NaN_var != NaN_var); \ \ /* \ the same tests but this time with NAN from <bits/nan.h> \ NAN is a double const \ */ \ check (#FLOAT " isnan (NAN)", isnan (NAN)); \ check (#FLOAT " isnan (-NAN)", isnan (-NAN)); \ check (#FLOAT " !isinf (NAN)", !(isinf (NAN))); \ check (#FLOAT " !isinf (-NAN)", !(isinf (-NAN))); \ check (#FLOAT " NAN != NAN", NAN != NAN); \ \ /* \ And again with the value returned by the `nan' function. \ */ \ check (#FLOAT " isnan (NAN)", isnan (NANFUNC (""))); \ check (#FLOAT " isnan (-NAN)", isnan (-NANFUNC (""))); \ check (#FLOAT " !isinf (NAN)", !(isinf (NANFUNC ("")))); \ check (#FLOAT " !isinf (-NAN)", !(isinf (-NANFUNC ("")))); \ check (#FLOAT " NAN != NAN", NANFUNC ("") != NANFUNC ("")); \ \ /* test if EPSILON is ok */ \ x1 = 1.0; \ x2 = x1 + EPSILON; \ check (#FLOAT " 1 != 1+EPSILON", x1 != x2); \ \ x1 = 1.0; \ x2 = x1 - EPSILON; \ check (#FLOAT " 1 != 1-EPSILON", x1 != x2); \ \ /* test if HUGE_VALx is ok */ \ x1 = HUGEVAL; \ check (#FLOAT " isinf (HUGE_VALx) == +1", isinf (x1) == +1); \ x1 = - HUGEVAL; \ check (#FLOAT " isinf (-HUGE_VALx) == -1", isinf (x1) == -1); \ } TEST_FUNC (float_test, float, nanf, FLT_EPSILON, HUGE_VALF) TEST_FUNC (double_test, double, nan, DBL_EPSILON, HUGE_VAL) #ifndef NO_LONG_DOUBLE TEST_FUNC (ldouble_test, long double, nanl, LDBL_EPSILON, HUGE_VALL) #endif int main (void) { float_test (); double_test (); #ifndef NO_LONG_DOUBLE ldouble_test (); #endif return errors != 0; }