asm asciz question

[inu11byte]

Bellow is the example that I am going to use.


The bellow code should compile on GNU assembler. Syntax is AT&T incase any numbies are curious.

.data 


HelloWorldString:
	.asciz "Hello"


.text 


.globl _start 


_start:
	# Load all the arguments for write () 


	movl $4, %eax
	movl $1, %ebx
	movl $HelloWorldString, %ecx
	movl $6, %edx #<-- This is where the number matters.
	int $0x80


	# Irrelivant. Just the exit syscall
	movl $1, %eax
	movl $0, %ebx
	int $0x80

Okay, I am using the write syscall. Did I do it correctly? Would I have to allocate 6 bytes of space(like I did), instead of just five? Because of the NUL? Thanks.

[brewbuck]

It's not C, there is no need for the string to be null terminated, nor to send a null character at the end of the string (in fact, it's probably wrong to do so)

[inu11byte]

Are you ........ing kidding me? Where did you learn ASM?

[Subsonics]

In this case you use the write system call, it's not a string function and does not rely on a terminating zero, instead it writes the amount of bytes you give as an argument. Let's call it from C.

int main()
{
    const char *s = "Hello";

    write(STDOUT_FILENO, s, 5);

    return 0;
}

[Elkvis]

Are you ........ing kidding me? Where did you learn ASM?

do you really think you're going to get useful help by responding to people that way?

[Fordy]

Are you ........ing kidding me? Where did you learn ASM?

Where did you learn it if you need to run to a forum for a bit of code that makes 2 system calls?

[brewbuck]

Are you ........ing kidding me? Where did you learn ASM?

I'm glad that my response has put you in a state of awe, but seriously... The compliments are unnecessary.

[inu11byte]

Okay, I'm sorry, I shouldn't have replied like that. :/ I understand you were just trying to help. Anyway, if I was shifting that variable to another area of memory, would that area of memory have to have 6 bytes of space, or just 5?