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| 2 |
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| 3 | #ifndef _LINUX_ARGS_H
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| 4 | #define _LINUX_ARGS_H
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| 5 |
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| 6 | |
| 7 | * How do these macros work?
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| 8 | *
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| 9 | * In __COUNT_ARGS() _0 to _12 are just placeholders from the start
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| 10 | * in order to make sure _n is positioned over the correct number
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| 11 | * from 12 to 0 (depending on X, which is a variadic argument list).
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| 12 | * They serve no purpose other than occupying a position. Since each
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| 13 | * macro parameter must have a distinct identifier, those identifiers
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| 14 | * are as good as any.
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| 15 | *
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| 16 | * In COUNT_ARGS() we use actual integers, so __COUNT_ARGS() returns
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| 17 | * that as _n.
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| 18 |
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| 19 |
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| 20 |
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| 21 | #define __COUNT_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
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| 22 | #define COUNT_ARGS(X...) __COUNT_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
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| 23 |
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| 24 |
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| 25 | #define __CONCAT(a, b) a ## b
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| 26 | #define CONCATENATE(a, b) __CONCAT(a, b)
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| 27 |
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| 28 | #endif
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