Fixed more segfaults, final commit ?

.gitignore

@@ -1,3 +1,4 @@
 *.o
 *.out
 *.a
+*.c

ft_read.s

@@ -2,16 +2,16 @@ global ft_read
 extern __errno_location
 
 ft_read:
-	mov eax, 0x11
+	mov eax, 0
 	syscall
 	test rax, rax
 	js .error
 	ret
 
 .error:
-	mov ebx, eax
+	mov rdx, rax
 	call __errno_location wrt ..plt
-	neg ebx
-	mov dword [rax], ebx
+	neg rdx
+	mov [rax], rdx
 	mov rax, -1
 	ret

ft_strcmp.s

@@ -1,17 +1,27 @@
 global ft_strcmp
-extern _malloc
 
 ft_strcmp:
+	xor r8, r8
 	xor rax, rax
-	xor rbx, rbx
 
 .count:
-	mov rax, [rdi + rbx]
-	sub rax, [rsi + rbx]
-	cmp rax, 0
+	mov al, BYTE [rdi + r8]
+	mov dl, BYTE [rsi + r8]
+	test al, al
+	jz .end
+	test dl, dl
+	jz .end
+	cmp al, dl
 	jne .end
-	inc rbx
+	inc r8
 	jmp .count
 
 .end: 
+	sub al, dl
+	js .neg
+	ret
+
+.neg:
+	neg al
+	neg rax
 	ret

ft_strcpy.s

@@ -1,17 +1,17 @@
 global ft_strcpy
 
 ft_strcpy:
-	xor rbx, rbx
+	xor rdx, rdx
 
 .cpy:
-	cmp byte [rsi + rbx], 0
+	cmp byte [rsi + rdx], 0
 	je .end
-	mov rax, [rsi + rbx]
-	mov [rdi + rbx], rax
-	inc rbx
+	mov rax, [rsi + rdx]
+	mov [rdi + rdx], rax
+	inc rdx
 	jmp .cpy
 
 .end:
-	mov byte [rdi + rbx], 0
+	mov byte [rdi + rdx], 0
 	mov rax, rdi
 	ret

ft_strdup.s

@@ -3,23 +3,21 @@ global ft_strdup
 extern ft_strlen
 extern ft_strcpy
 extern malloc
-extern __errno_location
 
 ft_strdup:
-    cmp rdi, 0
-    je .end
-    mov r12, rdi
     call ft_strlen
     inc rax
-    mov rdi, rax
+    push rdi
+    mov rdi, rax  ; move the result of strlen in rdi
     call malloc wrt ..plt
     test rax, rax
     je .end
-    mov rdi, rax
-    mov rsi, r12
+    pop r8
+    mov rdi, rax   ; move the result of malloc into rdi (override strlen result)
+    mov rsi, r8    ; move the argument of strdup in rsi
     call ft_strcpy
     ret
 
 .end:
-    xor rax, rax
+    pop r8
     ret

ft_write.s

@@ -2,16 +2,16 @@ global ft_write
 extern __errno_location
 
 ft_write:
-	mov eax, 0x1
+	mov eax, 0x1 ; put the syscall number of write
 	syscall
 	test rax, rax
 	js .error
 	ret
 
 .error:
-	mov ebx, eax
+	mov rdx, rax
 	call __errno_location wrt ..plt
-	neg ebx
-	mov dword [rax], ebx
+	neg rdx
+	mov [rax], rdx
 	mov rax, -1
 	ret

test.c

@@ -21,9 +21,11 @@ extern char *ft_strdup(const char *s);
 void Test_read(char *filename, int len)
 {
     char buffer[100] = {0};
+    int errnosave;
 
     int fd = open(filename, O_RDONLY);
     printf("READ : %ld | ", read(fd, buffer, len));
+    errnosave = errno;
     printf("%s\n", buffer);
     close(fd);
     bzero(buffer, len);
@@ -32,6 +34,7 @@ void Test_read(char *filename, int len)
     printf("READ : %ld | ", ft_read(fd, buffer, len));
     printf("%s\n", buffer);
     close(fd);
+    printf("READ : %s\n", (errnosave == errno) ? "OK" : "KO");
 }
 
 void Test_write(char *buffer, int len)
@@ -90,7 +93,7 @@ int main()
 
     Test_strlen("clafete");
 
-    Test_read("mauvaisdavid.txt", 15);
+    Test_read("mauvaisdavid.txt", 3);
 
     Test_write("youpipouic", 10);
 
@@ -98,5 +101,5 @@ int main()
 
     Test_strdup("youpilolololol");
 
-    Test_strcmp("vilain", "vilain");
+    Test_strcmp(buffer, "123");
 }