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TCP_RMV macro
Syntax
#define TCP_RMV(pcbs, npcb) \
do { \
if(*(pcbs) == (npcb)) { \
(*(pcbs)) = (*pcbs)->next; \
} \
else { \
struct tcp_pcb *tcp_tmp_pcb; \
for (tcp_tmp_pcb = *pcbs; \
tcp_tmp_pcb != NULL; \
tcp_tmp_pcb = tcp_tmp_pcb->next) { \
if(tcp_tmp_pcb->next == (npcb)) { \
tcp_tmp_pcb->next = (npcb)->next; \
break; \
} \
} \
} \
(npcb)->next = NULL; \
} while(0)