Make putchar() handle newlines correctly

src/kernel.c

@@ -57,6 +57,7 @@ uint8_t terminal_color;
 uint16_t *terminal_buffer = (uint16_t *)VGA_MEMORY;
 
 void terminal_initialize(void) {
+
     terminal_row = 0;
     terminal_column = 0;
     terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
@@ -79,6 +80,14 @@ void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
 }
 
 void terminal_putchar(char c) {
+    if (c == '\n') {
+        terminal_row += 1;
+        terminal_column = 0;
+        if (terminal_row == VGA_HEIGHT)
+            terminal_row = 0;
+        return;
+    }
+
     terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
     if (++terminal_column == VGA_WIDTH) {
         terminal_column = 0;
@@ -88,8 +97,9 @@ void terminal_putchar(char c) {
 }
 
 void terminal_write(const char *data, size_t size) {
-    for (size_t i = 0; i < size; i++)
+    for (size_t i = 0; i < size; i++) {
         terminal_putchar(data[i]);
+    }
 }
 
 void terminal_writestring(const char *data) {
@@ -101,5 +111,5 @@ void kernel_main(void) {
     terminal_initialize();
 
     /* Newline support is left as an exercise. */
-    terminal_writestring("Hello world from kernel.\n");
+    terminal_writestring("Hello world!\nI'm in the kernel and no one can stop me now! =)");
 }