Ticket #19040: foo.c

#include <errno.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

/* Test gradual underflow, resulting in a denormalized number.  */

int main ()
{
#if LDBL_MAX_EXP > 10000
  const char input[] = "1e-4950";
#else
  const char input[] = "1e-320";
#endif
  char *ptr;
  long double result;
  printf ("sizeof (long double) = %d\n", (int) sizeof (long double));
  errno = 0;
  result = strtold (input, &ptr);
  assert (0.0L < result);
  assert (result <= LDBL_MIN);
  assert (ptr == input + strlen (input));
#if !defined _MSC_VER
  assert (errno == ERANGE);
#endif
  printf ("OK\n");
}