;macros as per 64 bit conventions

%macro read 2
 mov rax,0  ;read
 mov rdi,0  ;stdin/keyboard
 mov rsi,%1 ;buf
 mov rdx,%2 ;buf_len
 syscall
%endmacro

%macro print 2
 mov rax,1  ;print
 mov rdi,1  ;stdout/screen
 mov rsi,%1 ;msg
 mov rdx,%2 ;msg_len
 syscall
%endmacro

%macro fopen 1
 mov rax,2  ;open
 mov rdi,%1 ;filename
 mov rsi,2  ;mode RW
 mov rdx,0777o ;File permissions
 syscall
%endmacro

%macro fread 3
 mov rax,0  ;read
 mov rdi,%1 ;filehandle
 mov rsi,%2 ;buf
 mov rdx,%3 ;buf_len
 syscall
%endmacro

%macro fwrite 3
 mov rax,1  ;write/print
 mov rdi,%1 ;filehandle
 mov rsi,%2 ;buf
 mov rdx,%3 ;buf_len
 syscall
%endmacro

%macro fclose 1
 mov rax,3  ;close
 mov rdi,%1 ;file handle
 syscall
%endmacro

%macro exit 0
 print nline,nline_len
 mov rax,60  ;exit
 mov rdi,0
 syscall
%endmacro