From 5e9b9783ded719eed6d604e3f16136d05f9ea162 Mon Sep 17 00:00:00 2001
From: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com>
Date: Sun, 2 Jan 2022 16:48:33 +0100
Subject: [PATCH] cat works

---
 src/cat.asm | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/cat.asm b/src/cat.asm
index 77cc96d..59905bc 100644
--- a/src/cat.asm
+++ b/src/cat.asm
@@ -1,4 +1,5 @@
           extern     open_file_arg
+          extern     println_num
 
           global     _start
 
@@ -29,23 +30,22 @@ _start:
           cmp       rax, 0
           jl        file_not_found
 
-          mov       rdi, rax
+          mov       r12, rax
           jmp       init
 
 stdin_init:
-          mov       rdi, STDIN_FD
+          mov       r12, STDIN_FD
 
 init:
-          ; the input fd is in rdi at this point
-          xor       r13, r13
+          ; the input fd is in r12 at this point
 process:
           ; read in from the file
+          mov       rdi, r12
           mov       rax, 0
           mov       rsi, io_buf
           mov       rdx, IO_BUF_SIZE
           syscall
 
-          ; test whether it is finished
           cmp       rax, 0
           jz        finish