用c语言编写的QQ程序，能实现注册，登陆，聊天等操作 -

#include "./inc/global.h"
int sockfd;
int flag = 0;
void menu()
{
printf("1: login\n");
printf("2: register\n");
printf("0: help\n");
}
void menu1()
{
printf("1: chat\n");
printf("2: exit\n");
}
int login()
{
struct user q;
char buf[128] = {0};
printf("please input name\n");
scanf("%s",q.name);
printf("please input passwd\n");
pw:
scanf("%s",q.passwd);
strcat(buf,"login[ DISCUZ_CODE_0 ]quot;);
strcat(buf,q.name);
strcat(buf,"[ DISCUZ_CODE_0 ]quot;);
strcat(buf,q.passwd);
write(sockfd,(void *)buf,strlen(buf));
memset(buf,0,128);
read(sockfd,(void *)buf,128);
if(strcmp(buf,"0") == 0)
{
printf("login success\n");
return 0;
}
if(strcmp(buf,"1") == 0)
{
printf("user name is not exist,please register\n");
return -1;
}
if(strcmp(buf,"2") == 0)
{
printf("user passwd is error,please input passwd\n");
memset(buf,0,128);
memset(q.passwd,0,32);
goto pw;
}
}
void client_register_user()
{
char buf[128] = {0};
struct user q = {0};
us:
printf("please input register name\n");
scanf("%s",q.name);
printf("please input register passwd\n");
scanf("%s",q.passwd);
strcat(buf,"register[ DISCUZ_CODE_0 ]quot;);
strcat(buf,q.name);
strcat(buf,"[ DISCUZ_CODE_0 ]quot;);
strcat(buf,q.passwd);
write(sockfd,(void *)buf,strlen(buf));
memset(buf,0,128);
read(sockfd,(void *)buf,128);
if(strcmp(buf,"0") == 0)
{
printf("register success,please login\n");
return ;
}
if(strcmp(buf,"1") == 0)
{
printf("user name is exist,please register\n");
memset(buf,0,128);
memset(q.name,0,32);
memset(q.passwd,0,32);
goto us;
}
}
void display_user(char *p)
{
int i;
i = 1;
while(1)
{
if(*p == '\0')
break;
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