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

char check_for_byte(uint8_t code, void *function)
{
	char result = 0;
	asm("mov $0xfff,%%ecx \n\t"
	    "repnz scasb      \n\t" // repnz scas %es:(%edi),%al
	    "setz %0          \n\t"
	    :"=r"(result):"a"(code),"D"(function));
	return result;
}

char check_for_word(uint16_t code, void *function)
{
	char result = 0;
	asm("mov $0xfff,%%ecx \n\t"
	    "repnz scasw      \n\t" // repnz scas %es:(%edi),%al
	    "setz %0          \n\t"
	    :"=r"(result):"a"(code),"D"(function));
	return result;
}

int main(int argc, char **argv)
{
	const uint8_t byte[] = {0xcc};
	const uint16_t word[] = {0xcd03, 0xcd2d};
	void *function[] = {check_for_byte, check_for_word, main};
	char *name[] = {"check_for_byte", "check_for_word", "main"};
	
	for(size_t f = 0; f < 3; ++f)
	{
		for(size_t b = 0; b < 1; ++b)
			if (check_for_byte(byte[b], function[f]))
			{
				printf("0x%x found in %s\n", byte[b] & 0xff, name[f]);
				// exit(0);
			}
		for(size_t w = 0; w < 2; ++w)
			if (check_for_word(word[w], function[f]))
			{
				printf("0x%x found in %s\n", word[w] & 0xffff, name[f]);
				// exit(0);
			}
	}
	
	puts("debugger not detected!!!");
}