--- a/Makefile	Mon Jan 27 12:24:20 2020 +0100
+++ b/Makefile	Mon Jan 27 13:03:39 2020 +0100
@@ -42,6 +42,7 @@
                 src/core/texture.c \
                 src/core/util.c \
                 src/core/walksprite.c \
+                src/core/wait.c \
                 src/core/window.c
 CORE_OBJS=      ${CORE_SRCS:.c=.o}
 CORE_DEPS=      ${CORE_SRCS:.c=.d}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/core/wait.c	Mon Jan 27 13:03:39 2020 +0100
@@ -0,0 +1,73 @@
+/*
+ * wait.c -- wait action
+ *
+ * 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 <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "action.h"
+#include "wait.h"
+#include "util.h"
+
+static bool
+action_update(struct action *a, unsigned int ticks)
+{
+	assert(a);
+
+	return wait_update(a->data, ticks);
+}
+
+static void
+action_finish(struct action *a)
+{
+	assert(a);
+
+	free(a->data);
+}
+
+void
+wait_start(struct wait *w)
+{
+	assert(w);
+	w->elapsed = 0u;
+}
+
+bool
+wait_update(struct wait *w, unsigned int ticks)
+{
+	assert(w);
+
+	w->elapsed += ticks;
+
+	if (w->elapsed >= w->delay)
+		w->elapsed = w->delay;
+
+	return w->elapsed >= w->delay;
+}
+
+void
+wait_action(const struct wait *w, struct action *a)
+{
+	assert(w);
+	assert(a);
+
+	memset(a, 0, sizeof (struct action));
+	a->data = ememdup(w, sizeof (struct wait));
+	a->update = action_update;
+	a->finish = action_finish;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/core/wait.h	Mon Jan 27 13:03:39 2020 +0100
@@ -0,0 +1,72 @@
+/*
+ * wait.h -- wait action
+ *
+ * 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_WAIT_H
+#define MOLKO_WAIT_H
+
+/**
+ * \file wait.h
+ * \brief Wait action.
+ */
+
+#include <stdbool.h>
+
+struct action;
+
+/**
+ * \brief Wait action.
+ */
+struct wait {
+	unsigned int delay;             /*!< (RW) Time to wait */
+	unsigned int elapsed;           /*!< (RO) Elapsed time */
+};
+
+/**
+ * Start the wait action.
+ *
+ * This function is equivalent to w->elapsed = 0;
+ *
+ * \pre w != NULL
+ * \param w the wait object
+ */
+void
+wait_start(struct wait *w);
+
+/**
+ * Update the wait object.
+ *
+ * \pre w != NULL
+ * \param w the wait object
+ * \param ticks the number of milliseconds since last frame
+ * \return true if complete
+ */
+bool
+wait_update(struct wait *w, unsigned int ticks);
+
+/**
+ * Create an action from the wait object.
+ *
+ * \pre w != NULL
+ * \pre a != NULL
+ * \param w the wait object to copy from
+ * \param a the action to fill
+ */
+void
+wait_action(const struct wait *w, struct action *a);
+
+#endif /* !MOLKO_WAIT_H */