China DOS Union

Author: 小草
A boot password program. Run it once and it will automatically add itself to autoexec.bat. The next time you boot, you will have to enter the password to get through.
The program is as follows:
#include "conio.h"
#include "string.h"
#include "stdio.h"

void error()
{window(12,10,68,10);
textbackground(15);
textcolor(132);
clrscr();
cprintf("file or system error! you can't enter the system!!!";
while(1); /*if there is an error, you cannot get through the program*/
}

void look()
{FILE *fauto,*fbak;
char *pass="c:\\windows\\password.exe"; /*location of this program*/
char a,ch;
char *au="autoexec.bat",*bname="hecfback.^^^"; /*bname is the backup of autoexec.bat*/
setdisk(2); /*set currently disk c:*/
chdir("\\"; /*set currently directory \*/
fauto=fopen(au,"r+";
if (fauto==NULL)
{fauto=fopen(au,"w+";
if (fauto==NULL) error();}
fread(a,23,1,fauto); /*read the first 23 characters of autoexec.bat*/
a='\0';

if (strcmp(a,pass)==0) /*if what was read is the same as the pass pointer then close the file, otherwise add it*/
fclose(fauto);
else
{fbak=fopen(bname,"w+";
if (fbak==NULL) error();
fwrite(pass,23,1,fbak);
fputc('\n',fbak);
rewind(fauto);
while(!feof(fauto))
{ch=fgetc(fauto);
fputc(ch,fbak);}
rewind(fauto);
rewind(fbak);
while(!feof(fbak))
{ch=fgetc(fbak);
fputc(ch,fauto);}
fclose(fauto);
fclose(fbak);
remove(bname); /*del bname file*/
}
}

void pass()
{char *password="88888888";
char input;
int n;
while(1)
{window(1,1,80,25);
textbackground(0);
textcolor(15);
clrscr();

n=0;
window(20,12,60,12);
textbackground(1);
textcolor(15);
clrscr();
cprintf("password:";
while(1)
{input=getch();
if (n>58) {putchar(7); break;} /*if there are more than 58 characters, end this input*/
if (input==13) break;
if (input>=32 && input0)
{cprintf("\b \b";
input='\0';
n--;}
}
input='\0';
if (strcmp(password,input)==0)
break;
else
{putchar(7);
window(30,14,50,14);
textbackground(15);
textcolor(132);
clrscr();
cprintf("password error!";
getch();}
}
}

main()
{look();
pass();
}