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lib: add macros to count variadic args

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Magical macro used to compute the number of arguments passed to a
variadic macro.

Signed-off-by: Quentin Young <qlyoung@nvidia.com>
This commit is contained in:
Quentin Young 2020-11-29 01:49:06 -05:00
parent f944ec671c
commit 9f79b3758d
1 changed files with 23 additions and 0 deletions
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23
lib/compiler.h
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@ -279,6 +279,29 @@ extern "C" {
#define array_size(ar) (sizeof(ar) / sizeof(ar[0]))
/* Some insane macros to count number of varargs to a functionlike macro */
#define PP_ARG_N( \
_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
_11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
_21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
_31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
_41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
_51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
_61, _62, _63, N, ...) N
#define PP_RSEQ_N() \
62, 61, 60, \
59, 58, 57, 56, 55, 54, 53, 52, 51, 50, \
49, 48, 47, 46, 45, 44, 43, 42, 41, 40, \
39, 38, 37, 36, 35, 34, 33, 32, 31, 30, \
29, 28, 27, 26, 25, 24, 23, 22, 21, 20, \
19, 18, 17, 16, 15, 14, 13, 12, 11, 10, \
9, 8, 7, 6, 5, 4, 3, 2, 1, 0
#define PP_NARG_(...) PP_ARG_N(__VA_ARGS__)
#define PP_NARG(...) PP_NARG_(_, ##__VA_ARGS__, PP_RSEQ_N())
/* sigh. this is so ugly, it overflows and wraps to being nice again.
*
* printfrr() supports "%Ld" for <int64_t>, whatever that is typedef'd to.