idk what i changed check the diffs

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)
+add_library(z tolower.asm strlen.asm strcmp.asm atoi.asm hextoi.asm)
 add_executable(example example.asm)
 target_link_libraries(example z)

atoi.asm

@@ -48,7 +48,7 @@ _loop:
 	jmp _loop
 
 _nan:
-	xor r10 r10
+	xor r10, r10
 
 _end:
 	mov rax, r10

unfinished/hextoi.asm

@@ -0,0 +1,64 @@
+extern libz_strlen
+
+global libz_hextoi
+
+section .text
+
+libz_hextoi:
+
+
+;	mov r11, rdi	;saveing it for later
+
+	push rdi
+	call libz_strlen
+	mov r9, rax
+	pop rdi
+
+	xor r10, r10
+
+	mov rcx, 1
+	add r9, rdi
+	dec r9
+
+_loop:
+
+	xor rax, rax
+	mov al, [r9]
+
+	cmp rax, 48
+	jb _nan
+	cmp rax, 70 ;if its not a number then return 0 then exit
+	ja _nan		;this actually as a bug if you put a : it will be allowed
+
+;	push rax
+
+	cmp rax, 58 ;if(char < 58){sub char, 48}else{sub char, 55}
+	jb _charbelow
+	sub rax, 55
+	jmp _hexitif
+_charbelow:
+	sub rax, 48
+_hexitif:
+    	
+	mul rcx
+	add r10, rax
+;	pop rax
+
+	cmp r9, rdi
+	je _end
+	dec r9
+;	push rax
+	mov rax, 16
+	mul rcx
+	mov rcx, rax
+;	pop rax
+
+	jmp _loop
+
+_nan:
+	xor r10, r10
+
+_end:
+	mov rax, r10
+	ret
+