1  /* Basic tests for labs.
       2     Copyright (C) 2023 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>