From 619ec9cab33d944be272e075bcc57b5c86e39e1b Mon Sep 17 00:00:00 2001
From: gumi <git@gumi.ca>
Date: Tue, 12 May 2020 18:16:23 -0400
Subject: add bitwise abstraction functions

---
 npc/functions/bitwise.txt | 23 +++++++++++++++++++++++
 npc/scripts.conf          |  1 +
 2 files changed, 24 insertions(+)
 create mode 100644 npc/functions/bitwise.txt

(limited to 'npc')

diff --git a/npc/functions/bitwise.txt b/npc/functions/bitwise.txt
new file mode 100644
index 00000000..58ad8b5c
--- /dev/null
+++ b/npc/functions/bitwise.txt
@@ -0,0 +1,23 @@
+/**
+ * gets a bitmasked value in a variable
+ *
+ * @arg 0 - the variable
+ * @arg 1 - mask
+ * @arg 2 - shift
+ */
+function	script	bitwise_get	{
+    return (getarg(0) & getarg(1)) >> getarg(2, 0);
+}
+
+/**
+ * sets a bitmasked value in a variable
+ *
+ * @arg 0 - the target variable
+ * @arg 1 - mask
+ * @arg 2 - shift
+ * @arg 3 - new value
+ * @return a reference to the variable
+ */
+function	script	bitwise_set	{
+    return set(getarg(0), (getarg(0) & ~(getarg(1))) | (getarg(3, 0) << getarg(2, 0)));
+}
diff --git a/npc/scripts.conf b/npc/scripts.conf
index d15eaef7..f0e48c98 100644
--- a/npc/scripts.conf
+++ b/npc/scripts.conf
@@ -13,6 +13,7 @@
 "npc/functions/math.txt",
 "npc/functions/warp.txt",
 "npc/functions/gender.txt",
+"npc/functions/bitwise.txt",
 
 // Misc functions
 "npc/functions/main.txt",
-- 
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