stdio-common/tst-scanf-round.c

   1 /* Test for correct rounding of negative floating-point numbers by scanf
   2    (bug 23280).
   3    Copyright (C) 2018-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <support/check.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28 #ifdef FE_DOWNWARD
  29   if (fesetround (FE_DOWNWARD) == 0)
  30     {
  31       double a = strtod ("-0.1", NULL);
  32       double b = 0;
  33       int r = sscanf ("-0.1", "%lf", &b);
  34       TEST_VERIFY (r == 1);
  35       TEST_VERIFY (a == b);
  36     }
  37 #endif
  38 #ifdef FE_UPWARD
  39   if (fesetround (FE_UPWARD) == 0)
  40     {
  41       double a = strtod ("-0.1", NULL);
  42       double b = 0;
  43       int r = sscanf ("-0.1", "%lf", &b);
  44       TEST_VERIFY (r == 1);
  45       TEST_VERIFY (a == b);
  46     }
  47 #endif
  48   return 0;
  49 }
  50
  51 #include <support/test-driver.c>