# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1541793863 -3600
# Node ID 839de4f15476a3be250f12d9170d192c3b83e3d4
# Parent  f40a40d7101fd8e186115b9557aca8553e5e2562# Parent  14c1529d2eb6d67a93f62048a66a20fe44d0b3c3
Merged changes involving absent files.

diff -r f40a40d7101f -r 839de4f15476 include/utils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/utils.h	Fri Nov 09 21:04:23 2018 +0100
@@ -0,0 +1,31 @@
+/*
+ * Some simple utility functions.
+ *
+ * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __UTILS_H__
+#define __UTILS_H__
+
+#include <stdint.h>
+
+void wait(uint32_t delay);
+
+uint8_t *wrap_pointer(uint8_t *ptr, uint8_t *lower, uint8_t *upper);
+
+int wrap_value(int value, int limit);
+
+#endif /* __UTILS_H__ */
diff -r f40a40d7101f -r 839de4f15476 lib/utils.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/utils.c	Fri Nov 09 21:04:23 2018 +0100
@@ -0,0 +1,58 @@
+/*
+ * Some simple utility functions.
+ *
+ * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "utils.h"
+
+
+
+/* A simple busy wait involving a register-based counter. */
+
+void wait(uint32_t delay)
+{
+    uint32_t counter = delay;
+
+    if (!delay) return;
+    while (counter--) __asm__("");      /* retain loop */
+}
+
+/* Wrap a pointer within the given limits. */
+
+uint8_t *wrap_pointer(uint8_t *ptr, uint8_t *lower, uint8_t *upper)
+{
+    uint32_t size = upper - lower;
+
+    if (ptr < lower)
+        return upper - (lower - ptr) % size;
+    else if (ptr >= upper)
+        return lower + (ptr - upper) % size;
+    else
+        return ptr;
+}
+
+/* Wrap a value within the bounds [0, limit). */
+
+int wrap_value(int value, int limit)
+{
+    if (value < 0)
+        return limit - (-value % limit);
+    else if (value >= limit)
+        return (value - limit) % limit;
+    else
+        return value;
+}