idk what i changed check the diffs

@quantum fix
i should probably make it more complient with the spec

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

@@ -25,6 +25,10 @@ _loop:
 	xor rax, rax
 	mov al, [r9]
 
+	cmp rax, 48
+	jb _nan
+	cmp rax, 57 ;if its not a number then return 0 then exit
+	ja _nan
 
 ;	push rax
 	sub rax, 48
@@ -43,7 +47,8 @@ _loop:
 
 	jmp _loop
 
-
+_nan:
+	xor r10, r10
 
 _end:
 	mov rax, r10

atoi_legacy2.asm

@@ -0,0 +1,51 @@
+extern libz_strlen
+
+global libz_atoi
+
+section .text
+
+libz_atoi:
+
+
+;	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]
+
+
+;	push rax
+	sub rax, 48
+	mul rcx
+	add r10, rax
+;	pop rax
+
+	cmp r9, rdi
+	je _end
+	dec r9
+;	push rax
+	mov rax, 10
+	mul rcx
+	mov rcx, rax
+;	pop rax
+
+	jmp _loop
+
+
+
+_end:
+	mov rax, r10
+	ret
+	

example.asm

@@ -7,7 +7,7 @@ extern libz_atoi
 section .data
 	text2 db "asdasdASDd",0
 	text db "asdasdasd",0
-	text3 dq "65",0
+	text3 dq "5",0
 	textstore dq 0,0
 	stoer db "0",0
 	differ db "they differ",0

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
+