Continuing terminal I/O

- Made stdio.h work
- Moved printFiletable back into kernel.c
- TODO: Add stdio.h to all files that should use it (probably next commmit)
- Added some more global addresses. There's a memory layout, but i'm not using it
- Got cursor to be drawn
- Calc program now gets user input

include/c/stdio.h

@@ -11,8 +11,39 @@ void print(const char* s) {
     write(STDOUT, s, strlen(s));
 }
 
-void read(char* s) { 
-    print("\x1b[1M[ ERROR: Read() Syscall not found! ]\n");
+void putc(char c) {
+    static char _c; // We need to pass in a static address. Idk why
+    _c = c;
+    write(STDOUT, &_c, 1);
+}
+
+char getc() {
+    char* character = (char*)0x3000;
+    *character = '\0';
+    while (*character == '\0') { __asm__ volatile ("hlt"); }
+    return *character;
+}
+
+// Reads until a newline
+// TODO: Use Read() Syscall
+void read(char* buffer) {
+    char c;
+    uint8_t len = 0;
+
+    while ((c = getc()) != '\n') {
+        if (c == '\b') {
+            if (len < 1) continue; // Can we backspace?
+            len--;
+            putc(c);
+        } else {
+            buffer[len++] = c;
+            putc(c);
+        }
+    }
+
+    buffer[len++] = c; // Add newline
+    putc(c);
+    buffer[len] = '\0'; // Null terminate
 }
 
 #endif