a.c

运用C语言编写的小型文件管理系统

#include<malloc.h>
#include<stdio.h>
#include<string.h>//主目录
 struct linkf
     {char username[16];
      struct links *next;
     };
 struct linkr//文件-记录类型
     {char name[16];
      int sex;
      struct linkr *next;
     };
 struct links//用户文件目录
     {char filename[16];
      struct linkr *headlink;//串联文件连接指针
      int length;
      struct links *next;//表目链表指针
     };
 struct linkt       //打开文件表
     {char filename[16];
      int flag;     //修改标志 0-没有修改  1-修改过
      int length;  //记录数
      struct linkr *headlink; //串联文件头指针
      struct linkt *next;  //表目链表指针
     };
 struct linkf mfd[5];
 struct links *ufd,*p2,*q2;
 struct linkr *p,*q;
 struct linkt *afd,*p3,*q3;
 char X[16],s,username[16];
 int r,i,w,k,n,m,j,t,flag;

 void print1()
  {int i;
   printf("\n MFD:\n");
   printf("----------------\n");
   for(i=0;i<n;i++)
    {printf("| %s",mfd[i].username);
     printf("\n----------------\n");
    }
 }

 void print2()
  {int i;
   for(i=0;i<n;i++)
     if (flag==i && ufd!=NULL)
      {printf("\n MFD__[%s]\n",mfd[i].username);
       p2=mfd[i].next;
       printf("+_UFD-Filename_+_   Length   _+\n");
       while(p2!=NULL)
	{printf("|%10s    |    %4d      |\n",p2->filename,p2->length);
	 p2=p2->next;
	 printf("+--------------+--------------+\n");
	}
      }
   if(ufd==NULL) printf("\nUFD_[%s] is NULL\n",username);
   if(afd!=NULL)
     {p3=afd;
      printf("\n\nAFD_[%s]\n",username);
      printf("+-----Filename-----+----length---+\n");
      while(p3!=NULL)
       {printf("|%12s      |      %d      |\n",
	p3->filename,p3->length);
	p3=p3->next;
	printf("+------------------|-------------+\n");
       }
     }
    else printf("\n\nAFD_[%s]  is NULL\n",username);
  }

 void print3()
  {p3=afd;
   printf("Input printing-filename:"); scanf("%s",X);
   if(p3!=NULL)
    {while((strcmp(p3->filename,X)!=0)&&(p3->next!=NULL))
       p3=p3->next;
     if(strcmp(p3->filename,X)!=0)
       printf("The file hasn't opened!\n");
      else
       if(p3->headlink==NULL) printf("The file is NULL!\n");
	else {p=p3->headlink; i=1;
	      printf("|   num    |     name       |   sex   |\n");
	      printf("---------------------------------------\n");
	      while (p!=NULL)
	{printf("|%5d     |%10s      |     %d   |\n",i,p->name,p->sex);
		i++; p=p->next;
		printf("---------------------------------------\n");
	       }
	     }
    } else printf("The file hasn't opened!\n");
  }

 void pcreate()
   { printf("Input create filename:");scanf("%s",X);
     q2=ufd;
     if (q2!=NULL)
      {while((strcmp(q2->filename,X)!=0)&&(q2->next!=NULL))
       q2=q2->next;
       if(strcmp(q2->filename,X)==0)
	{printf("File has already been created!\n");
	 return;
	}
      }
     p2=(struct links *)malloc(sizeof(struct links));
     if(ufd==NULL) ufd=p2; else q2->next=p2;
     strcpy(p2->filename,X);
     p2->length=0;
     p2->next=NULL;
     p2->headlink=NULL;
   }

 void popen()
  { p2=ufd;
    printf("Input Open filename:");scanf("%s",X);
    if(p2!=NULL)
     {while((strcmp(p2->filename,X)!=0)&&(p2->next!=NULL))
       p2=p2->next;
      if(strcmp(p2->filename,X)==0)
       {q3=afd;
	if(afd!=NULL)
	 {while((strcmp(q3->filename,X)!=0)&&(q3->next!=NULL))
	   q3=q3->next;
	  if(strcmp(q3->filename,X)==0)
	   {printf("The file \"%s\" has been opened.\n",X);
	    return;
	   }
	 }
	p3=(struct linkt *)malloc(sizeof(struct linkt));
	if(afd==NULL) afd=p3; else q3->next=p3;
	strcpy(p3->filename,X);
	p3->length=p2->length;
	p3->headlink=p2->headlink;
	p3->flag=0;
	p3->next=NULL;
	printf("The file \"%s\"has been opened.\n",X);
	return;
       }
     }
     printf("Can't find \"%s\" file in \"%s\" USER.\n",X,username);
  }

void pclose()
   {
	 
	 int n=0;p3=q3=afd;
	  if(afd==NULL)
	  {printf("You have not open files!");return;}
     else
	   printf("Input Open filename:");scanf("%s",X);
	     while((strcmp(p3->filename,X)!=0)&&(p3->next!=NULL))
		 {
			n++;q3=p3;p3=p3->next;}
			
		  if(strcmp(p3->filename,X)!=0)
          {
			 printf("The file hasn't be found!\n");
		     return;
		  }
		 else
		     
		 { if(n==0) afd=afd->next;
		 else q3->next=p3->next;}
			 
		 
		 
			 if(p3->flag==0)
			 {free (p3);
			    printf("The file ""%s" " is closed!\n",X);
				return;
			 }
			 else
			 {
				 p2=ufd;
                 if(p2!=NULL)
				 {while((strcmp(p2->filename,X)!=0)&&(p2->next!=NULL))
                  p2=p2->next;
                  if(strcmp(p2->filename,X)==0)
				  {
					  p2->length=p3->length;
					  p2->headlink=p3->headlink;
				  }
				 }
				q3=p3->next;
			    free (p3);
				printf("The file ""%s" " is closed!\n",X);
				return;
			 }
		 
	 
}
void pdelete()
   {   int n=m=0;
	  printf("Input the filename:");
	  scanf("%s",X);
	  q3=afd;
      while(q3!=NULL && strcmp(q3->filename,X)!=0)
	  {n++;p3=q3;q3=q3->next;}
	  if(q3!=NULL)
	  {	  
	    if(n==0)
				afd=afd->next;
			else 
			
			    p3->next=q3->next; 
				 
		
			free(q3);//free(p3);
	  }
	  {
		  q2=ufd;
		  
	      while(q2!=NULL && strcmp(q2->filename,X)!=0)
          {m++;p2=q2;q2=q2->next ;}
		  if(q2==NULL)
			  printf("The file %s is wrong!",X);
	      else
		  {	
			 if(m==0)
			 {
				ufd=ufd->next;
			 mfd[flag].next=ufd;
			 }
			else 
			 p2->next=q2->next;
		    
			free(q2);//free(p2);
			printf("The file ""%s" " is deleted!\n",X);
		  }
	  } 
	   
   }

 close()
   {while (afd!=NULL)
     {p3=afd; afd=afd->next;
      p2=ufd;
      while(strcmp(p2->filename,p3->filename)!=0
		    &&p2->next!=NULL) p2=p2->next;
      if(strcmp(p2->filename,p3->filename)==0)
	{p2->length=p3->length; p2->headlink=p3->headlink;
	}
      free(p3);
     }
   }

pread()
{     int ri,i=1;
      printf("Input the filename:");
	  scanf("%s",X);
	  q3=afd;
      while(q3!=NULL && strcmp(q3->filename,X)!=0)
		  q3=q3->next;
	  if(q3==NULL) {printf("file have not found!");return;}
	  else
	  {printf("input record :\n");scanf("%d",&ri);
	    if(ri>0) 
		{p=q3->headlink;
		while(p!=NULL&&ri>i)
		{p=p->next;i++;}
		if(p==NULL) {printf("The record number ERROR!");return;}
		else 
			 printf("--------------------------\n");

			if(p->sex ==0)
				   printf("Student-num :    %d\nStudent-name:    %s\nStudent-sex :    %s\n",i,p->name,"men");
			   else
				   printf("Student-num :    %d\nStudent-name:    %s\nStudent-sex :    %s\n",i,p->name,"women");
			   printf("--------------------------\n");
			   return;

		}
		printf("The record number ERROR!");
	     

	  
	  }
			

   }
pwrite()
{     int sex;
      printf("Input the filename:");
	  scanf("%s",X);
	  q3=afd;
      while(q3!=NULL && strcmp(q3->filename,X)!=0)
		  q3=q3->next;
	  if(q3==NULL) {printf("file have not found/open!");return;}
	  else
	  {
		  p=(struct linkr *)malloc(sizeof(struct linkr));
		  printf("input name:\n");scanf("%s",username);strcpy(p->name,username);
		  printf("input sex (0/1):\n");scanf("%d",&sex);p->sex=sex;
		  if(q3->headlink==NULL)
		 {
			 p->next=q3->headlink;
		     q3->headlink=p;
		 }
		 else
		 {
			 q=q3->headlink;
			 while(q->next!=NULL)
				q=q->next;
			 p->next=q->next;
			 q->next=p;
		 }
		 q3->flag=1;
		 q3->length++;
		 return;

	  }
}

 main()
   { afd=NULL;  ufd=NULL;
     for (i=0;i<5;i++)
      {strcpy(mfd[i].username,"                ");
       mfd[i].next=NULL;
      }
     printf("User number N(N<=5)=");scanf("%d",&n);
     for(i=0;i<n;i++)
       {w=0;
	printf("User MFD username X[%d]=",i+1);scanf("%s",X);
	for (j=0;j<n;j++)
	 if (strcmp(mfd[j].username,X)==0) w=1;
	if(w==0) strcpy(mfd[i].username,X);
	 else
	  { printf("\nThe Username has been Created!\n");i--;}
       }
  do
   { print1();
     do
       { printf("Input user name you want to operate:");
	 scanf("%s",username);
	 for(i=0;(i<n&&(strcmp(mfd[i].username,username)!=0));i++);
	 if(i>=n) {printf("Not found Username!\n");}
       } while(i>=n);
     t=0; flag=i; ufd=mfd[i].next;
     do
       { printf("\n------------------------------------\n");
	 printf("  1--Creat    2--Open     3--Delete\n");
	 printf("  4--cLose    5--Read     6--Write\n");
	 printf("  7--disPlay  8--fileplay 9--Quit\n");
	 printf("------------------------------------\n");
	 printf("               Select[ ]\b\b");
	 scanf("%s",&s);
	 switch(s)
	  {case '1':pcreate();break;
	   case '2':popen();break;
	   case '3':pdelete();break;
	   case '4':pclose();break;
	   case '5':pread();break;
	   case '6':pwrite();break;
	   case '7':print2();break;
	   case '8':print3();break;
	   case '9':t=1;close();
	  }
	 mfd[i].next=ufd;
       } while(!t);
      printf("\n---------------------------------------\n");
      printf("|   1--Edit other user  ,  2--Quit    |\n" );
      printf("---------------------------------------\n");
      printf("                Select[ ]\b\b");
      scanf("%d",&m);
      if(m==2) r=1;
       else  r=0;
     } while(!r);
   }