--- a/.hgignore	Mon Jan 13 13:38:14 2020 +0100
+++ b/.hgignore	Mon Jan 13 13:53:18 2020 +0100
@@ -14,6 +14,7 @@
 ^libmolko\.a$
 ^molko(\.exe)?$
 ^tests/test-color$
+^tests/test-error$
 ^tools/molko-map$
 
 # doxygen stuff.

--- a/Makefile	Mon Jan 13 13:38:14 2020 +0100
+++ b/Makefile	Mon Jan 13 13:53:18 2020 +0100
@@ -25,6 +25,7 @@
 SRCS=           src/animation.c \
                 src/clock.c \
                 src/event.c \
+                src/error.c \
                 src/font.c \
                 src/map.c \
                 src/message.c \
@@ -47,7 +48,8 @@
 JANSSON_CFLAGS= `pkg-config --cflags jansson`
 JANSSON_LDFLAGS=`pkg-config --libs jansson`
 
-TESTS=          tests/test-color.c
+TESTS=          tests/test-color.c \
+                tests/test-error.c
 TESTS_INCS=     -I extern/libgreatest -I src ${SDL_CFLAGS}
 TESTS_LIBS=     ${LIB} ${SDL_LDFLAGS} ${LDFLAGS}
 TESTS_OBJS=     ${TESTS:.c=}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/error.c	Mon Jan 13 13:53:18 2020 +0100
@@ -0,0 +1,63 @@
+/*
+ * error.c -- error routines
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "error.h"
+
+static char buffer[2048];
+
+const char *
+error(void)
+{
+	return buffer;
+}
+
+void
+error_printf(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	error_vprintf(fmt, ap);
+	va_end(ap);
+}
+
+void
+error_vprintf(const char *fmt, va_list ap)
+{
+	vsnprintf(buffer, sizeof (buffer), fmt, ap);
+}
+
+noreturn void
+error_fatalf(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	error_vfatalf(fmt, ap);
+	va_end(ap);
+}
+
+noreturn void
+error_vfatalf(const char *fmt, va_list ap)
+{
+	error_vprintf(fmt, ap);
+	exit(1);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/error.h	Mon Jan 13 13:53:18 2020 +0100
@@ -0,0 +1,72 @@
+/*
+ * error.h -- error routines
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef MOLKO_ERROR_H
+#define MOLKO_ERROR_H
+
+/**
+ * \file error.h
+ * \brief Error routines.
+ */
+
+#include <stdarg.h>
+#include <stdnoreturn.h>
+
+/**
+ * Get the last error returned.
+ *
+ * \return the error string
+ */
+const char *
+error(void);
+
+/**
+ * Set the game error with a printf-like format.
+ *
+ * \param fmt the format string
+ */
+void
+error_printf(const char *fmt, ...);
+
+/**
+ * \Similar to \a error_printf.
+ *
+ * \param fmt the format stinrg
+ * \param ap the variadic arguments pointer
+ */
+void
+error_vprintf(const char *fmt, va_list ap);
+
+/**
+ * Similar to \a error_printf but close the application.
+ *
+ * \param fmt the format string
+ */
+noreturn void
+error_fatalf(const char *fmt, ...);
+
+/**
+ * Similar to \a error_fatalf
+ *
+ * \param fmt the format string
+ * \param ap the variadic arguments pointer
+ */
+noreturn void
+error_vfatalf(const char *fmt, va_list ap);
+
+#endif /* !MOLKO_ERROR_H */

--- a/src/main.c	Mon Jan 13 13:38:14 2020 +0100
+++ b/src/main.c	Mon Jan 13 13:53:18 2020 +0100
@@ -16,91 +16,11 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "animation.h"
-#include "clock.h"
-#include "event.h"
-#include "font.h"
-#include "image.h"
-#include "map.h"
-#include "message.h"
-#include "sprite.h"
-#include "sys.h"
-#include "texture.h"
-#include "window.h"
-#include "painter.h"
-
-#include <SDL.h>
-
 int
 main(int argc, char **argv)
 {
 	(void)argc;
 	(void)argv;
 
-	struct map map;
-	struct font *font;
-
-	sys_init();
-	if (!window_init("Molko's Adventure", 1280, 720)) {
-		printf("%s\n", SDL_GetError());
-		exit(1);
-	}
-
-	printf("----> [%s]\n", sys_datapath("default.map"));
-	exit(0);
-
-	if (!map_open(&map, "default.map"))
-		exit(1);
-
-	if (!(font = font_openf("assets/fonts/DejaVuSansCondensed.ttf", 12)))
-		exit(1);
-
-	struct message welcome = {
-		.text = {
-			"Welcome to this adventure Molko.",
-			"I'm pretty proud of you.",
-			"Now get of my house."
-		},
-		.font = font
-	};
-	struct clock clock;
-
-	for (;;) {
-		uint64_t elapsed = clock_elapsed(&clock);
-
-		clock_start(&clock);
-
-		for (union event ev; event_poll(&ev); ) {
-			switch (ev.type) {
-			case EVENT_QUIT:
-				return 0;
-			case EVENT_MOUSE:
-				printf("mouse moved to %d, %d, state: %d\n", ev.mouse.x, ev.mouse.y, ev.mouse.buttons);
-				break;
-			case EVENT_CLICKDOWN:
-				printf("mouse click on %d, %d, which: %d\n", ev.click.x, ev.click.y, ev.click.button);
-				break;
-			default:
-				break;
-			}
-		}
-
-		painter_set_color(0x667788ff);
-		painter_clear();
-#if 0
-		message_update(&welcome, elapsed);
-		message_draw(&welcome);
-#endif
-		map_draw(&map);
-		painter_present();
-	}
-
-	sys_close();
-	map_close(&map);
-	font_close(font);
-
 	return 0;
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-error.c	Mon Jan 13 13:53:18 2020 +0100
@@ -0,0 +1,44 @@
+/*
+ * test-error.c -- test error routines
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <greatest.h>
+
+#include <error.h>
+
+TEST
+simple(void)
+{
+	error_printf("Failed: %d", 123);
+	ASSERT_STR_EQ("Failed: 123", error());
+	PASS();
+}
+
+SUITE(errors)
+{
+	RUN_TEST(simple);
+}
+
+GREATEST_MAIN_DEFS();
+
+int
+main(int argc, char **argv)
+{
+	GREATEST_MAIN_BEGIN();
+	RUN_SUITE(errors);
+	GREATEST_MAIN_END();
+}