feat: implemented strcpy, used constant

kernel/drivers/keyboard.c

@@ -39,7 +39,7 @@ static void keyboard_callback(registers_t regs) {
     if ((status & 0b00000001) == 0) {
         return;
     }
-    unsigned char scancode = port_byte_in(0x60);
+    unsigned char scancode = port_byte_in(PORT_PS2_DATA);
     print_scancode(scancode);
 }
 
@@ -63,7 +63,7 @@ void print_scancode(unsigned char scancode) {
             code -= 0x20; // to lowercase
         }
 
-        memcpy(msg, MSG_KEY, strlen(MSG_KEY));
+        strcpy(msg, MSG_KEY);
         msg[strlen(msg) - 3] = code;
         kprint(msg);
     }

kernel/libc/libc.c

@@ -14,6 +14,10 @@ int memcpy(char *dst, char *src, int amount) {
     return 0;
 }
 
+int strcpy(char *dst, char *src) {
+    return memcpy(dst, src, strlen(src) + 1);
+}
+
 int memset(char *dst, char data, int amount) {
     for (int i = 0; i < amount; ++i) {
         dst[i] = data;

kernel/libc/libc.h

@@ -10,6 +10,8 @@
 
 int memcpy(char *dst, char *src, int amount);
 
+int strcpy(char *dst, char *src);
+
 int memset(char *dst, char data, int amount);
 
 int itoa(int i, char *target);