math/bug-nextafter.c

   1 #include <fenv.h>
   2 #include <math.h>
   3 #include <float.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6
   7 int
   8 main (void)
   9 {
  10   int result = 0;
  11
  12   float i = INFINITY;
  13   float m = FLT_MAX;
  14   feclearexcept (FE_ALL_EXCEPT);
  15   if (nextafterf (m, i) != i)
  16     {
  17       puts ("nextafterf+ failed");
  18       ++result;
  19     }
  20   if (fetestexcept (FE_OVERFLOW) == 0)
  21     {
  22       puts ("nextafterf+ did not overflow");
  23       ++result;
  24     }
  25   feclearexcept (FE_ALL_EXCEPT);
  26   if (nextafterf (-m, -i) != -i)
  27     {
  28       puts ("nextafterf- failed");
  29       ++result;
  30     }
  31   if (fetestexcept (FE_OVERFLOW) == 0)
  32     {
  33       puts ("nextafterf- did not overflow");
  34       ++result;
  35     }
  36
  37   double di = INFINITY;
  38   double dm = DBL_MAX;
  39   feclearexcept (FE_ALL_EXCEPT);
  40   if (nextafter (dm, di) != di)
  41     {
  42       puts ("nextafter+ failed");
  43       ++result;
  44     }
  45   if (fetestexcept (FE_OVERFLOW) == 0)
  46     {
  47       puts ("nextafter+ did not overflow");
  48       ++result;
  49     }
  50   feclearexcept (FE_ALL_EXCEPT);
  51   if (nextafter (-dm, -di) != -di)
  52     {
  53       puts ("nextafter failed");
  54       ++result;
  55     }
  56   if (fetestexcept (FE_OVERFLOW) == 0)
  57     {
  58       puts ("nextafter- did not overflow");
  59       ++result;
  60     }
  61
  62   return result;
  63 }