bozo

Makefile

@@ -6,7 +6,7 @@
 #    By: vvaas <vvaas@student.42angouleme.fr>       +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2024/03/15 14:16:21 by vvaas             #+#    #+#              #
-#    Updated: 2024/03/15 16:52:30 by vvaas            ###   ########.fr        #
+#    Updated: 2024/03/27 17:45:37 by vvaas            ###   ########.fr        #
 #                                                                              #
 #******************************************************************************#
 

ft_strcpy.s

@@ -4,11 +4,11 @@ ft_strcpy:
 	xor rdx, rdx
 
 .cpy:
-	cmp byte [rsi + rdx], 0
+	cmp byte [rsi + rdx], 0 ; if src is empty
 	je .end
-	mov rax, [rsi + rdx]
-	mov [rdi + rdx], rax
-	inc rdx
+	mov rax, [rsi + rdx] ; move src[rdx] to rax
+	mov word [rdi + rdx], ax ; dest[rdx] = src[rdx]
+	inc rdx				 ; rdx++
 	jmp .cpy
 
 .end:

ft_strdup.s

@@ -5,18 +5,18 @@ extern ft_strcpy
 extern malloc
 
 ft_strdup:
-    call ft_strlen
-    inc rax
-    push rdi
+    call ft_strlen 
+    inc rax       ; we add one to the result of strlen for the \0
+    push rdi	  ; we put rdi in r10 for later use
     mov rdi, rax  ; move the result of strlen in rdi
-    call malloc wrt ..plt
-    test rax, rax
+    call malloc wrt ..plt ; 
+    test rax, rax		; test if malloc failled
     je .end
-    pop rsi
+    pop rsi        ; we take the value we saved earlier
     mov rdi, rax   ; move the result of malloc into rdi (override strlen result)
     call ft_strcpy
     ret 
 
 .end:
-    pop r8
+	pop rsi
     ret

ft_write.s

@@ -2,16 +2,25 @@ global ft_write
 extern __errno_location
 
 ft_write:
+	cmp rsi, 0
+	je .bad_buff
 	mov eax, 0x1 ; put the syscall number of write
 	syscall
-	test rax, rax
+	test rax, rax ; test if the syscall failed
 	js .error
 	ret
 
-.error:
-	mov rdx, rax
+.bad_buff:
+	mov rdx, 22
 	call __errno_location wrt ..plt
-	neg rdx
 	mov [rax], rdx
 	mov rax, -1
+	ret
+
+.error:
+	mov rdx, rax  ; move the syscall return value
+	call __errno_location wrt ..plt
+	neg rdx       ; we neg the syscall return value to put it in errno
+	mov [rax], rdx ; *errno_location = value
+	mov rax, -1    ; we return -1
 	ret