Merge pull request #7639 from qlyoung/frr-lua

Scripting

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/compiler.h b/lib/compiler.h
index 217a60d888..70ef8e9bc8 100644
--- a/lib/compiler.h
+++ b/lib/compiler.h
@@ -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.