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

CMakeLists.txt

@@ -18,6 +18,6 @@ add_compile_options(-g)
 add_link_options(-fno-pie -m64 -no-pie -pedantic-errors)
 
 #Make a EXE with cpp and asm files
-add_library(z tolower.asm strlen.asm strcmp.asm atoi.asm hextoi.asm)
+add_library(z tolower.asm strlen.asm strcmp.asm atoi.asm)
 add_executable(example example.asm)
 target_link_libraries(example z)

example.asm

@@ -3,6 +3,7 @@ extern libz_strlen
 extern libz_strcmp
 extern libz_tolower
 extern libz_atoi
+extern malloc
 
 section .data
 	text2 db "asdasdASDd",0
@@ -60,7 +61,7 @@ _differ:
 	mov rdi, differ
 	cld
 	call puts
-	jmp _end
+	jmp _afterdiff
 
 
 
@@ -69,6 +70,27 @@ _notdiffer:
 	cld
 	call puts
 
+_afterdiff:
+
+	mov rdi, 20
+	cld
+	call malloc
+;i think i just malloced (hopefully)
+
+	xor rcx, rcx
+_malloctestloop:
+	mov [rax], rcx
+	cmp rcx, 20
+	je _end
+	inc rcx
+	inc rax
+	jmp _malloctestloop
+
+
+
+	
+
+
 _end:
 	add rsp, 8	;exit
 	ret

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

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