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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
1234567891011121314151617181920212223242526272829/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ARGS_H#define _LINUX_ARGS_H
/* * How do these macros work? * * In __COUNT_ARGS() _0 to _15 are just placeholders from the start * in order to make sure _n is positioned over the correct number * from 15 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. */#define __CONCAT(a, b) a ## b#define CONCATENATE(a, b) __CONCAT(a, b)
#endif /* _LINUX_ARGS_H */