Implemented rudimentary 'page down' key support, which moves the cursor to the first character of the next line

editor.c

@@ -82,6 +82,26 @@ void buffer_left(Buffer* buffer) {
 	}
 }
 
+
+void page_down_handler(Buffer* buffer) {
+	buffer_right(buffer); /* I must advance the cursor at least 
+				once, so this hardcoded statement is fine. */
+
+
+	while (*(buffer->start - 1) != '\n') {
+		buffer_right(buffer);
+	}
+
+	/* You would think that I need to call 'buffer_right' once 
+	more, to advance the cursor onto the next line.	In fact, if 
+	you think about it, the place where the cursor (the rectangle) 
+	is, is actually the character _after_ the gap. Therefore, by 
+	advancing the start to the newline character, the character 
+	after the gap (i.e. the cursor)	will automatically be moved to 
+	the next line. */
+
+}
+
 void init_curses() {
 	initscr();
 	noecho();
@@ -123,8 +143,6 @@ int main(int argc, char** argv) {
 		}
 	}
 
-
-
 	init_curses();
 	int ch;
 
@@ -184,8 +202,8 @@ int main(int argc, char** argv) {
 								exception here), but that's a problem for another day. */
 				break;
 
-			case KEY_DOWN:
-							
+			case KEY_NPAGE:
+				page_down_handler(buffer);			
 				break;
 
 			default: