stdlib/tst-labs.c

   1 /* Basic tests for labs.
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <limits.h>
  20 #include <stdlib.h>
  21
  22 #include <support/check.h>
  23
  24 #define LARGE_PRIME 49999
  25
  26 static int do_test (void)
  27 {
  28   long int i;
  29
  30   TEST_COMPARE (labs (LONG_MAX), LONG_MAX);
  31   TEST_COMPARE (labs (LONG_MIN + 1), LONG_MAX);
  32   TEST_COMPARE (labs (-1), 1);
  33   TEST_COMPARE (labs (0), 0);
  34   TEST_COMPARE (labs (1), 1);
  35
  36   for (i = LONG_MIN + 1; i < LONG_MIN + INT_MAX; i += LARGE_PRIME)
  37     TEST_COMPARE (labs (i), -i);
  38
  39   for (i = LONG_MAX - INT_MAX; i < LONG_MAX - LARGE_PRIME;
  40        i += LARGE_PRIME)
  41     TEST_COMPARE (labs (i), i);
  42
  43   for (i = INT_MIN + 1; i < 0; i += LARGE_PRIME)
  44     TEST_COMPARE (labs (i), -i);
  45
  46   for (i = 0; i <= INT_MAX - LARGE_PRIME; i += LARGE_PRIME)
  47     TEST_COMPARE (labs (i), i);
  48
  49   return EXIT_SUCCESS;
  50 }
  51
  52 #include <support/test-driver.c>