Awake from the darkness..

Hi , It has been a long time haa? Since i wrote my last post to this blog, i lost my mind:) There are many things changed, i was graduated in July from both of my major.. Now, it is happening again, i decide to write something in order to be alive.. You can not live in fair my man :p So take a look at that sezar crypto algorithm: ( it is not just complete but very near :)

#include<stdio.h>


void encode( char* str ){
    asm (
        "movl %0,%%ebx\n\t"        //store the string address in ebx register
        "eback:\n\t"                //loop scans the string character
        "movb (%%ebx), %%al\n\t"  //put next character to eax register
        "cmp  $0, %%al\n\t"       //look at string termination, NULL character
        "je   efinish\n\t"          //jump to finish point if null is found
        "addb $3, %%al\n\t"       //forward 3 characters front..
        "movb %%al, (%%ebx)\n\t"  //put encrypted character to its place
        "addl $1, %%ebx\n\t"       //go to next character
        "jmp eback\n\t"
        "efinish:\n\t"
        :
        :"g"(str)            
        :"%ebx" //ebx is marked as  changed register
    );   
}




void decode( char* str ){
    asm (
        "movl %0,%%ebx\n\t"        //store the string address in ebx register
        "dback:\n\t"                //loop scans the string character
        "movb (%%ebx), %%al\n\t"  //put next character to eax register
        "cmp  $0, %%al\n\t"       //look at string termination, NULL character
        "je   dfinish\n\t"          //jump to finish point if null is found
        "subb $3, %%al\n\t"       //forward 3 characters back..
        "movb %%al, (%%ebx)\n\t"  //put encrypted character to its place
        "addl $1, %%ebx\n\t"       //go to next character
        "jmp dback\n\t"
        "dfinish:\n\t"
        :
        :"g"(str)            
        :"%ebx" //ebx is marked as  changed register
    ); 
}

int main(){
    
    char message[] = "Hi this is emreknlk";
    
    /*original message*/
    printf("original \tmessage: %s\n",message);
    
    /* encode the message:*/
    encode( message );
    
    printf("encoded \tmessage: %s\n",message);
    
    /*decode the message*/ 
    decode( message );
    printf("decoded \tmessage: %s\n",message);
    
    return 0;
}

output:
D:\My Documents\itu\cc>sezar_asm.exe
original        message: Hi this is emreknlk
encoded         message: Kl#wklv#lv#hpuhnqon
decoded         message: Hi this is emreknlk

yea, i want to begin with C, asm and pointers :) It is just a begining it is not the end.. C U Soon guys..