login.c

linux下开发的一款类似QQ的网络聊天室

#include "main.h"
#define L_MAX 1024

int login(char *name,char *passwd)
{
	FILE *fp;
	char *p,*q,*r;
	char buff[L_MAX];
	if((p=strchr(name,'\n'))!=NULL)
		*p='\0';
	if((p=strchr(passwd,'\n'))!=NULL)
		*p='\0';
	if((fp=fopen("passwd","r"))==NULL)
	{
		printf("open passwd error!\n");
		exit(1);
	}
	while((r=fgets(buff,sizeof(buff),fp))!=NULL)
	{
		p=strchr(buff,':');
		q=p+1;
		*p='\0';
		if(strcmp(name,buff)==0)
		{
			p=strchr(q,'\n');
			*p='\0';
			if(strcmp(passwd,q)!=0)
			{
				return (-1);
			}
			else
			{
				return 0;
			}
		}
	}
	if(r==NULL)
	{
		printf("username not existed !\nplease regist first !\n");
		return (-1);
	}
	fclose(fp);
}