users.c

飞鸽传书协议的linux实现,使用多线程实现的

/**********************************************************
 *Filename: utils.c
 *Author:   ������
 *Date:     2009-5-21
 *
 *�û��Ĵ���
 *********************************************************/

#include "users.h"

user userList;

int insertUser(user *uList, user *target)
{
  user *pre, *cur;
  int compName, compHost, compAddr;

  if ((uList==NULL)||(target==NULL))
    return -1;

  if (target->peer.sin_addr.s_addr == htonl(INADDR_ANY))
    return -1;
  
  pre = uList;
  cur = uList->next;
  
  while (cur!=NULL)
  {
    compName=strncmp(cur->name, target->name, sizeof(cur->name));
    compHost=strncmp(cur->host, target->host, sizeof(cur->host));
    compAddr=memcmp(&cur->peer, &target->peer, sizeof(cur->peer));
    
    if (compName>0)
      break;
    
    if ((compName==0) && (compHost==0) && (compAddr==0))
    {
      if (cur->exit == 1)
        cur->exit = 0;
      return -1;
    }

    pre = cur;
    cur = cur->next;
  }
  
  target->next = pre->next;
  pre->next = target;
  return 0;
}

void destroyUsers(user *uList)
{
  user *cur;

  if (uList==NULL)
    return;

  while ((cur=uList->next)!=NULL)
  {
    uList->next = cur->next;
    free(cur);
  }
}

int listUsers(user **pusers, user *uList, int size, int flag) //flag==1ʱ������г������û�
{
  user *cur;
  int order=0, tmp;
  const char name[]="Name";
  const char host[]="HostName";
  const char ip[]="Ip";

  if ((pusers==NULL)&&(flag==0))
    return 0;
  
  if (flag==0)
    bzero(pusers, sizeof(user*)*size);
  printf("\n\n**********************************************\n");
  printf("   %-10s%-20s%-15s\n", name, host, ip);

  cur = uList->next;
  while ((cur!=NULL)&&(size>1)) //���һ�����ã����������жϽ���
  {
    if (cur->exit == 0)
    {
      printf("%-3d%-10s%-20s%-15s\n",
             ++order, cur->name, cur->host, inet_ntoa(cur->peer.sin_addr));//
      if (flag==0)
      {
        cur->inUse = 1;
        *pusers++ = cur;
        size--;
      }
    }
    cur = cur->next;
  }
  
  printf("**********************************************\n\n");
  
  if (order==0)
    printf("\nNo other users found.\nPlease refresh(rf) or list(ls) later.\n\n");

  return order;
  
}

int unListUsers(user **pusers, int num)
{
  user *cur;
  int tmp=0;

  if (pusers == NULL)
    return -1;
  
  while (num-->0)
  {
    cur = *pusers++;
    if (cur!=NULL)
    {
      cur->inUse = 0;
      tmp++;
    }
  }
  return tmp;
}

/*
user* findUser(user *uList, int index)
{
  user *cur=uList;
  
  while((index>0) && (cur!=NULL))
  {
    index--;
    cur = cur->next;
  }

  return cur;
}
*/

int delUser(user *uList, command *peercom)
{
  user *cur;
  int compName, compHost, compAddr;

  if (uList==NULL)
    return -1;

  cur = uList->next;

  while (cur!=NULL)
  {
    compName=strncmp(cur->name, peercom->senderName, sizeof(cur->name));
    compHost=strncmp(cur->host, peercom->senderHost, sizeof(cur->host));
    compAddr=memcmp(&cur->peer, &peercom->peer, sizeof(cur->peer));
    
    if (compName>0)
      return -1;

    if ((compName==0) && (compHost==0) && (compAddr==0))
    {
      cur->exit = 1;
      break;
    }
    cur = cur->next;
  }
  
  return 0;
  
}