RE: [lwip-users] Strange "always true" conditional in tcp_in.c

[Bill Auerbach]

#define max_dup_acks(size) (size == 1 ? 0xffu : size == 2 ? 0xffffu :
0xfffffffful)

if (pcb->dupacks != max_dup_acks(sizeof pcb->dupacks))
  ++pcb->dupacks;