单链表的最装逼写法

include <stdio.h>

#include <stdint.h>

#include <stdlib.h>



#define STAILQ_ENTRY(type)   \

struct {                     \

  struct type *stqe_next;    \

}



struct mbuf {

  uint32_t           magic;   /* mbuf magic (const) */

  STAILQ_ENTRY(mbuf) next;    /* next mbuf */

  uint8_t            *pos;    /* read marker */

  uint8_t            *last;   /* write marker */

  uint8_t            *start;  /* start of buffer (const) */

  uint8_t            *end;    /* end of buffer (const) */

};



#define STAILQ_HEAD(name, type)       \

struct name {                         \

  struct type *stqh_first;            \

  struct type **stqh_last;            \

}



STAILQ_HEAD(mhdr, mbuf);



#define STAILQ_NEXT(elm, field)    ((elm)->field.stqe_next)



#define STAILQ_INSERT_TAIL(head, elm, field) do {  \

  STAILQ_NEXT((elm), field) = NULL;                \

  *(head)->stqh_last = (elm);                      \

  (head)->stqh_last = &STAILQ_NEXT((elm), field);  \

} while (0)



int main(void)

{

  struct mhdr *mhdr = malloc(sizeof(struct mhdr));

  mhdr->stqh_first = NULL;

  mhdr->stqh_last  = &mhdr->stqh_first;



  int i;

  for (i = 0; i < 16; i++) {

    struct mbuf *mbuf = malloc(sizeof(struct mbuf));

    STAILQ_INSERT_TAIL(mhdr, mbuf, next);

    printf("%p ", mbuf);

  }

  printf("\n");



  for (i = 0; i < 16; i++) {

    struct mbuf *mbuf = mhdr->stqh_first;

    printf("%p ", mbuf);

    mhdr->stqh_first = mhdr->stqh_first->next.stqe_next;

  }

  printf("\n");



  return 0;

}

输出结果：

[jabari@hbase-rs2-test ~]$ gcc a.c 

[jabari@hbase-rs2-test ~]$ ./a.out 

0x1804030 0x1804070 0x18040b0 0x18040f0 0x1804130 0x1804170 0x18041b0 0x18041f0 0x1804230 0x1804270 0x18042b0 0x18042f0 0x1804330 0x1804370 0x18043b0 0x18043f0 

0x1804030 0x1804070 0x18040b0 0x18040f0 0x1804130 0x1804170 0x18041b0 0x18041f0 0x1804230 0x1804270 0x18042b0 0x18042f0 0x1804330 0x1804370 0x18043b0 0x18043f0