add a null character when stopped early

kernel/Devices/terminal.c

 #include <types.h>
 #include <lib.h>
+#include <Devices/keyboard.h>
 
 #include "terminal.h"
 
 int32_t terminal_read(int32_t fd, void* buf, int32_t nbytes){
-	return -1;
+	int bytes_read = 0;
+	while (bytes_read < nbytes) {
+		uint8_t key = keyboard_get_key();
+		if (key == '\n') {
+			*((uint8_t*)buf + bytes_read) = '\0';
+			break;
+		}
+
+		*((uint8_t*)buf + bytes_read) = key;
+		bytes_read++;
+	}
+	return 0;
 }
 
 int32_t terminal_write(int32_t fd, const void* buf, int32_t nbytes)