error compiling a little program

hi

im trying to make a program in linux to call another program doing first a check to see if the HD has the right serial number

i know if i put the serial in some parts of the code is possible to edit the value with a hex editor after compile, so i was thinking about to put the serial on a #define, but isnt working:

Code:

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

#define TRAVA XXXXXXXXXX2568

        int hd ()
        {
        	system("ls /dev/disk/by-id/ |cut -d_ -f3 |head -n 1");
        }

 int main ()    
{

	if (hd() == TRAVA)
		system("./game");
	else {
		printf("Erro");
	}
}

comand to compile:

Code:

gcc abrir.c -o abrir

the result:

Code:

abrir.c:14: error: ‘XXXXXXXXXX2568’ undeclared (first use in this function)
abrir.c:14: error: (Each undeclared identifier is reported only once
abrir.c:14: error: for each function it appears in.)

When you #define TRAVA, is TRAVA a string of digits or is it a number?

print it out as both a string, and as a number, and tell us which it is.

when i execute in terminal the comand

Code:

ls /dev/disk/by-id/ |cut -d_ -f3 |head -n 1

i have this result with this hard disk:

Code:

S19GJ50Q342568

so, i think i need to put this in #define line to work on this hd:

Code:

#define TRAVA S19GJ50Q342568

to work like:

Code:

" if {ls /dev/disk/by-id/ |cut -d_ -f3 |head -n 1 == S19GJ50Q342568} ok"

I believe that string of char's should be put into a char array[], and then have an end of string null added onto the end of it. (Leave at least one char for that in your array)

Then you can compare it to any other string with

if(strcmp(arrayname1, arrayname2) == 0)
//it's a match.

In C you can't compare a string to another string, by using the simple:
if(string1 == string2)

Doesn't work.

Additionally, you could store the serial number in /etc/ or someplace else, and read that in, rather than hand-modifying the ELF executable.

See the man pages for fopen, fgets, and fputs for more info on that.

And, I'm sure there's an entry somewhere in the FAQ at this website.