From 7fecbb5170b94add41f87be5d5fb5156a828e935 Mon Sep 17 00:00:00 2001
From: zombie <zombie@qtechofficial.com>
Date: Sat, 18 Sep 2021 06:06:05 -0400
Subject: [PATCH] added diff but currently it only compares length

---
 CMakeLists.txt |  1 +
 diff.asm       | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 diff.asm

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e00b71..8702b0a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,3 +20,4 @@ add_link_options(-fno-pie -m64 -no-pie -pedantic-errors)
 add_executable(length length.asm)
 add_executable(yes yes.asm)
 add_executable(case case.asm)
+add_executable(diff diff.asm)
diff --git a/diff.asm b/diff.asm
new file mode 100644
index 0000000..e50da93
--- /dev/null
+++ b/diff.asm
@@ -0,0 +1,54 @@
+extern puts
+%include "../inc/length_func.inc"
+
+
+
+
+
+section .data
+	text db "rEE",0
+	text2 db "REEE",0
+	differ db "they differ",0
+	notdiffer db "they do not differ",0
+	textlength dq 0
+	text2length dq 0
+section .text
+	global main
+
+main:
+	sub rsp, 8	;enter
+
+
+;below we are getting the length of each string
+;we do this because we dont want to compare with memory that isnt ours
+
+	mov r8, text
+	call length_func
+	mov [textlength], rax
+
+	mov r8, text2
+	call length_func
+	mov [text2length], rax
+
+	mov r8, [textlength]
+	mov r9, [text2length]
+
+	cmp r8, r9
+	jne _differ
+
+
+	
+_differ:
+    	mov rdi, differ
+    	cld
+    	call puts
+    	jmp _end
+
+_notdiffer:
+	mov rdi, notdiffer
+	cld
+	call puts
+
+_end:
+	add rsp, 8	;exit
+	ret