.extern _printf, __strlen

.global _print, _a, _b, _add, _str, _str1, _print_str_len

_a: .int 200
_b: .int 300

_str: .string "Hello, World!\n"

_str1: .string "\n%d\n"

_print: #void print(const char* s);
	pushl %ebp
	movl %esp, %ebp
	pushl 8(%esp)
	call _printf
	addl $4, %esp
	popl %ebp
	ret

_add: #int add(int a, int b);
	pushl %ebp
	movl %esp, %ebp
	movl 12(%esp), %eax
	addl 8(%esp), %eax
	popl %ebp
	ret

_print_str_len: # void print_str_len(const char* s);
	pushl %ebp
	movl %esp, %ebp
	pushl 8(%esp)
	call __strlen
	addl $4, %esp
	pushl %eax
	pushl $_str1
	call _printf
	addl $8, %esp
	popl %ebp
	ret

#include <stdio.h>

int _strlen(const char* s) {
	int len = 0;
	while(*s++) {
		len++;
	}
	return len;
}

extern int a;
extern int b;
extern char str;
extern char str1;

int add(int a, int b);
void print(const char* s);
void print_str_len(const char* s);

int main(void) {
	print(&str);
	printf(&str1, add(a, b));
	print_str_len(&str);
}