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%ifndef ZSTRING_INC
%define ZSTRING_INC
%ifndef SYS_INC
%include "sys.inc"
%endif
%macro make_zstring 2-*
section .data
%1: db %2
%rep %0-2
db %3
%rotate 1
%endrep
db 0
%endm
section .text
length_zstring:
;; rax = zstring address
push rbp
mov rbp, rsp
;;
mov rdx, rax
xor rax, rax
.loop:
mov cl, byte [rdx]
cmp cl, 0
je .exit
inc rax
inc rdx
jmp .loop
.exit:
;;
mov rsp, rbp
pop rbp
ret
print_zstring:
;; rax = zstring address
push rbp
mov rbp, rsp
;;
push rax
mov rsi, rax
call length_zstring
mov rdx, rax
mov rax, SYS_WRITE
mov rdi, 1
syscall
;;
mov rsp, rbp
pop rbp
ret
%endif
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