X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=network_common.h;fp=network_common.h;h=7b6f81d22b8cffb2b9c7b82df493b929eaa5282a;hb=15c0b8cb57ed5d10814103eaa0b5c06e8ae117e4;hp=b3abade7705e2573e04b7d48313b5a5866218482;hpb=bdd98e4458be4a143cd415e5077b373129b1b0d9;p=carveJwlIkooP6JGAAIwe30JlM.git

diff --git a/network_common.h b/network_common.h
index b3abade..7b6f81d 100644
--- a/network_common.h
+++ b/network_common.h
@@ -29,4 +29,14 @@ static u32 network_msgstring( const char *src,
    return vg_strncpy( src, buf, string_len, k_strncpy_always_add_null );
 }
 
+static u32 network_pair_index( u32 _a, u32 _b ){
+   const u32 N = NETWORK_MAX_PLAYERS;
+   assert( (_a != _b) && (_a<N) && (_b<N) );
+
+   u32 a = VG_MIN( _a, _b ),
+       b = VG_MAX( _a, _b );
+
+   return ((N-a)*((N-a)-1))/2 - b + a;
+}
+
 #endif /* NETWORK_COMMON_H */