admin.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "kk.h"
node * readtext(FILE *p)
{
		char buf[300];
		char *ptr;
		int i=0;
		node * last=NULL;
		node * first=NULL;
		while(fgets(buf,300,p)!=NULL)
		{
				if(i==0)
				{
						first=add_to_list(first);
						last=first;
						i++;
				}
				else
				{
						last=add_to_tail(last);
				}
				ptr=buf;
				buf[strlen(buf)-2]='\0';
				ptr=strtok(buf,"\t");
				while(ptr!=NULL)
				{
						if(strncmp(ptr,"Name",4)==0)
						{
								ptr=ptr+5;
								strcpy(last->name,ptr);
						}
						else if(strncmp(ptr,"password",8)==0)		
						{
								ptr=ptr+9;
								strcpy(last->password,ptr);
						}
						ptr=strtok(NULL,"\t");
				}
		}
		return first;
}
node * add_to_list(node *first)
{
		node *new_node;
		new_node=malloc(sizeof(node));
		if(new_node==NULL)
		{
				printf("error:malloc failed in create_list\n");
				exit(EXIT_FAILURE);
		}
		new_node->next=first;
		return new_node;
}
node * add_to_tail(node *last)
{
		node *new_node;
		new_node=malloc(sizeof(node));
		if(new_node==NULL)
		{
				printf("error:malloc failed in add_to_list\n");
				exit(EXIT_FAILURE);
		}
		last->next=new_node;
		new_node->next = NULL;
		return new_node;
}
int search_name(node *list,char *name,char *password)
{
		int found=0;
		char *ptr=password;
		while(list != NULL)
		{
				if(strcmp(list->name,name) == 0)
				{
						printf("password:");
						scanf("%s",password);
						if(strcmp(list->password,ptr) == 0)
						{
								found=1;
								break;
						}
				}
				list=list->next;
		}
		return found;
}
int login(node *first)
{
		int i;
		char staff_name[20];
		char staff_password[20];
		while(1)
		{
				printf("name:");
				scanf(" %s",staff_name);
				i=search_name(first,staff_name,staff_password);
				if(i==0)
				{
						printf("can't found\n");
						continue;
				}
				if(strcmp(staff_name,"admin")==0)
				{
						printf("------admin mode------\n");
						return 0;
				}
				printf("------staff mode------\n");
				return 1;
		}
}
void print_admin_list()
{
		printf("A)Add staff\nB)Delete staff\nC)Edit staffname/password\nD)view stafflist (in orders)\E)output staff info to the file\nE)output staff info to the file\n");
}
void print_staff_list()
{
		printf("F)Load customer account\nG)Create new customer account\nH)Cash deposit\nI)Cash withdrawl\nJ)Fund transfer\nK)Account info\nL)Transaction info\nM)Log out\n");
}
void add_staff(node *first)
{
		char password[20];
		char name[20];
		while(1)
		{
				int i;
				printf("name:");
				scanf("%s",name);
				i=search_name(first,name,password);
				if(i==1)
				{
						printf("the staff has already exist\n");
								continue;
				}
				break;
		}
		printf("password:");
		scanf("%s",password);
		node *last;
		last=first;
		while(last->next!=NULL)
		{
				last=last->next;
		}
		last=add_to_tail(last); 
		strcpy(last->name,name);
		strcpy(last->password,password);
		printf("%s\n",last->name);
		printf("%s\n",last->password);
		printf("success\n");
		}
}

admin.h

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

struct node
{
		char name[10];
		char password[10];
		struct node *next;
};
typedef struct node node;
node * readtext(FILE *p);
node * add_to_list(node *first);
node * add_to_tail(node *first);
int search_name(node *,char *,char *);
int login(node *first);
void print_admin_list();
void print_staff_list();
void add_staff(node *);

main.c

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "kk.h"
int main()
{
		int i;
		char c;
		FILE *p;
		node *first;
		p=fopen("staff.txt","r");
		first=readtext(p);
		i=login(first);
		if(i==0)
		{
				print_admin_list();
			    scanf(" %c",&c);
				//---------option-----------//
				if(c=='A')add_staff(first);
		}
		else 
		{
				print_staff_list();
		}

}