scaning for breakpoints on x86_64 in memmory

/*
; bool scan(void* code, unsigned int depth);
scan:
   mov rcx, rsi   ; move size argument into rcx for the loop
   mov rsi, rdi   ; move the the text pointer to rsi for printing
loop:
   cmp byte [rsi], 0xCC ; check for break point
   je fuck_you
   inc rsi
loop loop
   xor rdi, rdi
   ret
fuck_you:
   xor rdi, rdi
   mov al, 1
   ret
*/

bool scan_for_breakpoints(void (*fun), int depth)   /// scans a section of a function for break points
{
    int i;
    for(i=0;i<=depth;i++)   /// count from offset start to depth
    {
        unsigned int inst = (*(volatile unsigned int *)((unsigned int)fun + i) & 0xff); /// get the instruction
        if (inst == 0xCC)   /// if this is a break point
            return true;    /// return true
    }
    return false;
}