added atoi

atoi.asm

@@ -0,0 +1,87 @@
+extern libz_strlen
+
+global libz_atoi
+
+section .text
+
+libz_atoi:
+
+	mov r8, rdi
+
+
+
+	mov r8, text	;loop setup
+
+	xor r9, r9
+
+_loopasd23:
+
+	mov r9b, [r8]
+	
+	cmp r9, 0 	;check and see if we have reached the end of the string
+	jz _exitloopasd12
+
+	sub r9, 48
+
+	mov [r8], r9b
+	inc r8
+	jmp _loopasd23
+
+_exitloopasd12:
+
+	
+
+	call libz_strlen
+	mov r8, rax
+	mov r11, rax
+	
+	add r8, rdi
+
+
+	mov rcx, 1
+_loop2asd12:
+	dec r8
+	mov al, [r8]
+
+
+	mul rcx
+	mov [r8], al
+
+	
+	mov rax, rcx
+	mov r10, 10
+	mul r10
+	mov rcx, rax
+	
+	cmp r8, rdi
+	je _exitloop2asd12
+	jmp _loop2asd12
+_exitloop2asd12:
+
+	mov r8, rdi
+	mov r9, rdi
+	inc r9
+
+_loop3asd12:
+
+	mov r11b, [r9]
+	mov r10b, [r8]
+	cmp r11, 0
+	jz _endasdasd23123
+
+	add r11, r10
+
+	mov [r9], r11b
+	mov [r8], r10b
+
+
+	inc r8
+	inc r9
+
+	jmp _loop3asd12
+
+	
+_endasdasd23123:
+    	mov rax, [r8]
+	ret
+