Well, this is a homework question, but I need help!

What I need to do is to read 1024 bytes from "filename.txt" using fopen, fread, and fclose using ASM.

in C:

#include <stdio.h>
int main() {
  char buffer[1024];
  FILE* file = fopen("filename.txt","r");
  fread(file,buffer,1024);
  fclose(file);
}

Sure, I can use -S and take a look to the .s but it's very difficult to read... (for me)

So, these are my ideas (ASM):

I know it sucks, but anyone can help me?

yes is true.
The -S flag include a lot of stuff and "advanced asm" I don't understand it

Ok, if I change the string stuff, this is a good sketch?

The xor is useless, you don't want to set eax to 0 for anything.

Funaction arguments are pushed in reverse order, from right to left.

Remove the pop after the call to fopen.

I don't know what offset and length are. I've never seen them.

But if it's homework... what is your teacher doing? Not teaching you, certainly

They're in all versions of MingW I've tryed. Also in MSVC and in the old TurboC. I though that was part of the standard. I don't know why this is not true in linux.

Yes, xoring is faster than a 'mov eax, 0', but he doesn't need to set eax to 0 in the first place

[edit]
One more thing. This may depend on the assembler you use, but I think the keyword for importing symbols is 'public', not 'extern'.

okay, then, the code approximated is this: ?

// When use the buffer??

Lukas

You should also check eax is different from NULL after opening the file.

Got a user interface course on the last week of January, and then spent most of February doing interface testings and user testings. I missed the hardcore of C programming, though

BTW, you can push strings on the stack. You just can't use them like that. You have to pass esp as the argument to the function, since the function wants a pointer.