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authenticate.c
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authenticate.c
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#include<reg51.h>
#include<string.h>
void invalid()
{
int i;
char text[7] = " INVALID ";
for(i=0;n[i]!='\0';i++)
{
SBUF = text[i];
while(TI==0);
TI = 0;
}
while(1);
}
void valid()
{
int i;
char text[6] = " VALID ";
for(i=0;text[i]!='\0';i++)
{
SBUF = text[i];
while(TI==0);
TI = 0;
}
while(1);
}
void main()
{
int i;
char act_usr[10] = "username" , act_pass[10] = "auth8051" , usr[10] , pas[10] ;
SCON = 0X50;
TMOD = 0X20;
TH1 = 0XFF;
TR1 = 1;
for(i=0; act_usr[i]!='\0'; i++)
{
while(RI==0);
usr[i] = SBUF;
RI = 0;
SBUF = usr[i];
while(TI==0);
TI = 0;
}
usr[i] = '\0';
if(strcmp(act_usr,usr)==0)
{
for(i=0; act_pass[i]!='\0'; i++)
{
while(RI==0);
pas[i] = SBUF;
RI = 0;
SBUF = '*';
while(TI==0);
TI = 0;
}
pas[i] = '\0';
if(strcmp(act_pass,pas)==0)
{
valid();
}
else
{
invalid();
}
}
else
{
invalid();
}
while(1);
}