diff options
| author | hathach <[email protected]> | 2018-07-02 17:32:09 +0700 |
|---|---|---|
| committer | hathach <[email protected]> | 2018-07-02 17:32:09 +0700 |
| commit | 1faf0a81e4ef7176f152165fe46ff65b598d09ce (patch) | |
| tree | 32f7285d39e3db3083309924131f916aa30a82f5 /src/common | |
| parent | 1ee2bee5c8bc997c107ed1d1f03db183f513df42 (diff) | |
clean up
Diffstat (limited to 'src/common')
| -rw-r--r-- | src/common/tusb_common.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/common/tusb_common.h b/src/common/tusb_common.h index 2ac0e2e8b..2b45a50c9 100644 --- a/src/common/tusb_common.h +++ b/src/common/tusb_common.h @@ -102,6 +102,37 @@ #define __be2n_16(u16) __n2be_16(u16)
#endif
+
+/*------------------------------------------------------------------*/
+/* Count number of arguments of __VA_ARGS__
+ * - reference https://groups.google.com/forum/#!topic/comp.std.c/d-6Mj5Lko_s
+ * - _GET_NTH_ARG() takes args >= N (64) but only expand to Nth one (64th)
+ * - _RSEQ_N() is reverse sequential to N to add padding to have
+ * Nth position is the same as the number of arguments
+ * - ##__VA_ARGS__ is used to deal with 0 paramerter (swallows comma)
+ *------------------------------------------------------------------*/
+#ifndef VA_ARGS_NUM_
+
+#define VA_ARGS_NUM_(...) NARG_(_0, ##__VA_ARGS__,_RSEQ_N())
+#define NARG_(...) _GET_NTH_ARG(__VA_ARGS__)
+#define _GET_NTH_ARG( \
+ _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 _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
+#endif
+
//--------------------------------------------------------------------+
// INLINE FUNCTION
//--------------------------------------------------------------------+
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