support: Add TEST_COMPARE macro

1 files changed, 55 insertions, 0 deletions

diff --git a/support/support_test_compare_failure.c b/support/support_test_compare_failure.c
new file mode 100644
index 0000000..894145b
--- /dev/null
+++ b/support/support_test_compare_failure.c
@@ -0,0 +1,55 @@
+/* Reporting a numeric comparison failure.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <support/check.h>
+
+static void
+report (const char *which, const char *expr, long long value, int negative,
+        int size)
+{
+  printf ("  %s: ", which);
+  if (negative)
+    printf ("%lld", value);
+  else
+    printf ("%llu", (unsigned long long) value);
+  unsigned long long mask
+    = (~0ULL) >> (8 * (sizeof (unsigned long long) - size));
+  printf (" (0x%llx); from: %s\n", (unsigned long long) value & mask, expr);
+}
+
+void
+support_test_compare_failure (const char *file, int line,
+                              const char *left_expr,
+                              long long left_value,
+                              int left_negative,
+                              int left_size,
+                              const char *right_expr,
+                              long long right_value,
+                              int right_negative,
+                              int right_size)
+{
+  support_record_failure ();
+  if (left_size != right_size)
+    printf ("%s:%d: numeric comparison failure (widths %d and %d)\n",
+            file, line, left_size * 8, right_size * 8);
+  else
+    printf ("%s:%d: numeric comparison failure\n", file, line);
+  report (" left", left_expr, left_value, left_negative, left_size);
+  report ("right", right_expr, right_value, right_negative, right_size);
+}