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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _LINUX_ARGS_H
- #define _LINUX_ARGS_H
- /*
- * How do these macros work?
- *
- * In __COUNT_ARGS() _0 to _12 are just placeholders from the start
- * in order to make sure _n is positioned over the correct number
- * from 12 to 0 (depending on X, which is a variadic argument list).
- * They serve no purpose other than occupying a position. Since each
- * macro parameter must have a distinct identifier, those identifiers
- * are as good as any.
- *
- * In COUNT_ARGS() we use actual integers, so __COUNT_ARGS() returns
- * that as _n.
- */
- /* This counts to 15. Any more, it will return 16th argument. */
- #define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _n, X...) _n
- #define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
- /* Concatenate two parameters, but allow them to be expanded beforehand. */
- #ifndef __CONCAT
- #define __CONCAT(a, b) a ## b
- #endif
- #ifndef CONCATENATE
- #define CONCATENATE(a, b) __CONCAT(a, b)
- #endif
- #endif /* _LINUX_ARGS_H */
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