dns_sortip.c

来自「fget是一个小型的HTTP/FTP工具」· C语言 代码 · 共 21 行

#include "byte.h"
#include "dns.h"

/* XXX: sort servers by configurable notion of closeness? */
/* XXX: pay attention to competence of each server? */

void dns_sortip(char *s,unsigned int n)
{
  unsigned int i;
  char tmp[4];

  n >>= 2;
  while (n > 1) {
    i = dns_random(n);
    --n;
    byte_copy(tmp,4,s + (i << 2));
    byte_copy(s + (i << 2),4,s + (n << 2));
    byte_copy(s + (n << 2),4,tmp);
  }
}