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-rw-r--r--quantum/util.h52
1 files changed, 33 insertions, 19 deletions
diff --git a/quantum/util.h b/quantum/util.h
index ab96ce4bde..9c034cc404 100644
--- a/quantum/util.h
+++ b/quantum/util.h
@@ -1,26 +1,11 @@
-/*
-Copyright 2011 Jun Wako <wakojun@gmail.com>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program 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 General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
+// Copyright 2022 Stefan Kerkmann (KarlK90)
+// Copyright 2011 Jun Wako <wakojun@gmail.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
#pragma once
#include "bitwise.h"
-// convert to L string
-#define LSTR(s) XLSTR(s)
-#define XLSTR(s) L## #s
// convert to string
#define STR(s) XSTR(s)
#define XSTR(s) #s
@@ -32,3 +17,32 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#if !defined(MAX)
# define MAX(x, y) (((x) > (y)) ? (x) : (y))
#endif
+
+#if !defined(CEILING)
+/**
+ * @brief Computes the rounded up result of a division of two integers at
+ * compile time.
+ */
+# define CEILING(dividend, divisor) (((dividend) + (divisor)-1) / (divisor))
+#endif
+
+#if !defined(IS_ARRAY)
+/**
+ * @brief Returns true if the value is an array, false if it's a pointer.
+ *
+ * This macro is ill-formed for scalars, which is OK for its intended use in
+ * ARRAY_SIZE.
+ */
+# define IS_ARRAY(value) (!__builtin_types_compatible_p(typeof((value)), typeof(&(value)[0])))
+#endif
+
+#if !defined(ARRAY_SIZE)
+/**
+ * @brief Computes the number of elements of the given array at compile time.
+ *
+ * This Macro can only be used for statically allocated arrays that have not
+ * been decayed into a pointer. This is detected at compile time, though the
+ * error message for scalar values is poor.
+ */
+# define ARRAY_SIZE(array) (__builtin_choose_expr(IS_ARRAY((array)), sizeof((array)) / sizeof((array)[0]), (void)0))
+#endif