MDEV-8931: (server part of) session state tracking

initial commit to test

1 files changed, 22 insertions, 0 deletions

diff --git a/sql-common/pack.c b/sql-common/pack.c
index 4bb4a0b7a4e..5428feb623e 100644
--- a/sql-common/pack.c
+++ b/sql-common/pack.c
@@ -186,3 +186,25 @@ uchar *safe_net_store_length(uchar *packet, size_t packet_len, ulonglong length)
   return packet+8;
 }
 
+
+/**
+  The length of space required to store the resulting length-encoded integer
+  for the given number. This function can be used at places where one needs to
+  dynamically allocate the buffer for a given number to be stored as length-
+  encoded integer.
+
+  @param num [IN]   the input number
+
+  @return length of buffer needed to store this number [1, 3, 4, 9].
+*/
+
+uint net_length_size(ulonglong num)
+{
+  if (num < (ulonglong) 251LL)
+    return 1;
+  if (num < (ulonglong) 65536LL)
+    return 3;
+  if (num < (ulonglong) 16777216LL)
+    return 4;
+  return 9;
+}