display system

It works. self.state = Happy;

CMakeLists.txt

@@ -14,6 +14,10 @@ include_directories(include)
 
 set(SOURCES
 	src/main.c
+	src/disp/display.c
+	src/disp/print.c
+	src/disp/init.c
+	src/disp/clear.c
 )
 
 set(ASSETS

include/disp.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#define DISP_BUFFER_SIZE 1024
+extern char disp_buffer[DISP_BUFFER_SIZE];
+
+void disp_init(void);
+void disp_clear(void);
+int disp_print(char *text);
+void disp_display(void);

src/disp/clear.c

@@ -0,0 +1,7 @@
+#include "disp.h"
+
+void
+disp_clear(void)
+{
+	disp_buffer[0] = '\0';
+}

src/disp/display.c

@@ -0,0 +1,35 @@
+#include "disp.h"
+#include <gint/display.h>
+#include <gint/keyboard.h>
+
+static void draw_line(int x, int y, char *buffer, int len);
+
+void
+disp_display(void)
+{
+	static int line_height = 0;
+	const int x = 2;
+	int y = 2;
+	char *buffer_cursor = disp_buffer;
+	int line_length = 0;
+
+	if (!line_height)
+		line_height = dfont_default()->line_height;
+
+	while (buffer_cursor[line_length] != '\0') {
+		if (buffer_cursor[line_length] == '\n') {
+			draw_line(x, y, buffer_cursor, line_length);
+			buffer_cursor += line_length + 1;
+			line_length = 0;
+			y += line_height;
+		} else
+			line_length += 1;
+	}
+	draw_line(x, y, buffer_cursor, line_length);
+}
+
+static void
+draw_line(int x, int y, char *buffer, int len)
+{
+	dtext_opt(x, y, C_BLACK, C_NONE, DTEXT_LEFT, DTEXT_TOP, buffer, len);
+}

src/disp/init.c

@@ -0,0 +1,9 @@
+#include "disp.h"
+
+char disp_buffer[DISP_BUFFER_SIZE];
+
+void
+disp_init(void)
+{
+	disp_clear();
+}

src/disp/print.c

@@ -0,0 +1,20 @@
+#include "disp.h"
+
+int
+disp_print(char *text)
+{
+	char *buffer_cursor = disp_buffer;
+	char *text_cursor = text;
+
+	while (*buffer_cursor != '\0')
+		buffer_cursor += 1;
+
+	while (*text_cursor != '\0') {
+		*buffer_cursor = *text_cursor;
+		buffer_cursor += 1;
+		text_cursor += 1;
+	}
+	buffer_cursor[1] = '\0';
+
+	return 0;
+}

src/main.c

@@ -1,3 +1,4 @@
+#include "disp.h"
 #include <gint/display.h>
 #include <gint/keyboard.h>
 
@@ -6,8 +7,12 @@ main(void)
 {
 	/* init */
 	disp_init();
+	disp_print("Hello, World!\n");
+	disp_print("Draw me an unicorn!\n");
+	disp_print("<Hackcell> UwU\n");
 
 	dclear(C_WHITE);
+	disp_display();
 	dupdate();
 
 	getkey();