fixed the CMakeLists.txt so that it includes all the files in source as variables

src/drivers/io/io.c

@@ -1,7 +1,7 @@
 #include "io.h"
 
 /*
-    Common Ports 
+    Common Ports
     COM1: 0x3F8
     COM2: 0x2F8
     COM3: 0x3E8
@@ -24,6 +24,12 @@ char io_read_com()
     // TODO: Read from the COM port
     // Use the appropriate memory or I/O address to read from the port
     // Return the read data
+
+    char data = 0; // Initialize the variable to store the read data
+
+    // Read from the COM port and assign the read value to the 'data' variable
+
+    return data; // Return the read data
 }
 
 // Function to write to the COM port
@@ -40,6 +46,12 @@ char io_read_lpt()
     // TODO: Read from the LPT port
     // Use the appropriate memory or I/O address to read from the port
     // Return the read data
+
+    char data = 0; // Initialize the variable to store the read data
+
+    // Read from the LPT port and assign the read value to the 'data' variable
+
+    return data; // Return the read data
 }
 
 // Function to write to the LPT port

src/drivers/io/io.h

@@ -1,6 +1,8 @@
 #ifndef IO_H
 #define IO_H
 
+#include <stdint.h>
+
 // Function to initialize the COM and LPT ports
 void io_init();
 
@@ -16,4 +18,9 @@ char io_read_lpt();
 // Function to write to the LPT port
 void io_write_lpt(char data);
 
+// Function declarations for keyboard.c
+uint8_t inb(uint16_t port);
+void    outb(uint16_t port, uint8_t data);
+void    install_interrupt_handler(uint8_t interrupt, void (*handler)(void));
+
 #endif /* IO_H */