From 0428078991057ebf2be8ef4c84094ee33a548468 Mon Sep 17 00:00:00 2001
From: zombie <zombie@qtechofficial.com>
Date: Sat, 27 Nov 2021 04:39:20 -0500
Subject: [PATCH] made tolower not nuke your string (i think)

previously tolower would take your string and modify it but now it returns a new string that has been tolowered
---
 tolower.asm        | 29 +++++++++++++++++++++++++++++
 tolower_legacy.asm | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 tolower_legacy.asm

diff --git a/tolower.asm b/tolower.asm
index add19b3..c35e789 100644
--- a/tolower.asm
+++ b/tolower.asm
@@ -1,4 +1,5 @@
 extern libz_strlen
+extern malloc
 
 global libz_tolower
 section .text
@@ -11,6 +12,32 @@ libz_tolower:
 	call libz_strlen
 	mov r10, rax
 
+	inc rax		;we do this because we need room for the null terminator
+
+	mov rdi, rax
+	push r11
+	push r10
+	call malloc	;spot to put the new string
+	pop r10
+	pop r11
+
+	;at this point r11 (hopfully) has the original string and rax has the new string home
+	push rax	;save rax for later
+	push rax	;save it twice so we can return the pointer
+_mcopyloop:
+	mov r8b, [r11]
+	mov [rax], r8b
+	inc r11
+	inc rax
+
+	mov rsi, [r11]	;man i hope i can use rsi for anything and it wont nuke anything
+	cmp sil, 0
+	jnz _mcopyloop
+	
+	pop r11	;the loop below uses r11
+
+
+
 
 	xor rcx, rcx	;we do this to clear rcx incase it had garbage in it before
 _loop:
@@ -34,5 +61,7 @@ _endloop:
 	cmp rcx, r10
 	jle _loop
 
+	pop rax		;returning rax (the pointer to the new string)
+
 	add rsp, 8	;exit
 	ret
diff --git a/tolower_legacy.asm b/tolower_legacy.asm
new file mode 100644
index 0000000..add19b3
--- /dev/null
+++ b/tolower_legacy.asm
@@ -0,0 +1,38 @@
+extern libz_strlen
+
+global libz_tolower
+section .text
+
+libz_tolower:
+	sub rsp, 8	;enter
+
+	mov r11, rdi
+
+	call libz_strlen
+	mov r10, rax
+
+
+	xor rcx, rcx	;we do this to clear rcx incase it had garbage in it before
+_loop:
+	;do loop things
+
+	mov r9, r11
+	add r9, rcx
+
+	mov r8b, [r9]	;this block here makes sure that our character is a capital letter and if its not a capital letter do nothing and return
+	cmp r8b, 90
+	ja _endloop
+	cmp r8b, 65
+	jb _endloop
+
+	add r8b, 32	;make the letter capital
+	mov [r9], r8b
+
+_endloop:
+	;end loop
+	inc rcx
+	cmp rcx, r10
+	jle _loop
+
+	add rsp, 8	;exit
+	ret