diff options
Diffstat (limited to 'quantum/util.h')
| -rw-r--r-- | quantum/util.h | 49 |
1 files changed, 33 insertions, 16 deletions
diff --git a/quantum/util.h b/quantum/util.h index 21c290013c..9c034cc404 100644 --- a/quantum/util.h +++ b/quantum/util.h @@ -1,19 +1,7 @@ -/* -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" @@ -29,3 +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 |