support/support_test_compare_failure.c

   1 /* Reporting a numeric comparison failure.
   2    Copyright (C) 2017-2019 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 <errno.h>
  20 #include <stdio.h>
  21 #include <support/check.h>
  22
  23 static void
  24 report (const char *which, const char *expr, long long value, int positive,
  25         int size)
  26 {
  27   printf ("  %s: ", which);
  28   if (positive)
  29     printf ("%llu", (unsigned long long) value);
  30   else
  31     printf ("%lld", value);
  32   unsigned long long mask
  33     = (~0ULL) >> (8 * (sizeof (unsigned long long) - size));
  34   printf (" (0x%llx); from: %s\n", (unsigned long long) value & mask, expr);
  35 }
  36
  37 void
  38 support_test_compare_failure (const char *file, int line,
  39                               const char *left_expr,
  40                               long long left_value,
  41                               int left_positive,
  42                               int left_size,
  43                               const char *right_expr,
  44                               long long right_value,
  45                               int right_positive,
  46                               int right_size)
  47 {
  48   int saved_errno = errno;
  49   support_record_failure ();
  50   if (left_size != right_size)
  51     printf ("%s:%d: numeric comparison failure (widths %d and %d)\n",
  52             file, line, left_size * 8, right_size * 8);
  53   else
  54     printf ("%s:%d: numeric comparison failure\n", file, line);
  55   report (" left", left_expr, left_value, left_positive, left_size);
  56   report ("right", right_expr, right_value, right_positive, right_size);
  57   errno = saved_errno;
  58 }