From 2dc9d118efb64de6ea54a5a9eb4474f8e5ef3145 Mon Sep 17 00:00:00 2001
From: Paul Oliver <contact@pauloliver.dev>
Date: Thu, 29 Feb 2024 01:50:44 +0100
Subject: Initial commit

---
 src/instset.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/instset.c

(limited to 'src/instset.c')

diff --git a/src/instset.c b/src/instset.c
new file mode 100644
index 0000000..1333ffb
--- /dev/null
+++ b/src/instset.c
@@ -0,0 +1,56 @@
+#include <assert.h>
+#include "types.h"
+#include "instset.h"
+
+sbool
+si_isInst(sbyte inst)
+{
+	return inst < SINST_COUNT;
+}
+
+static sbool
+isBetween(sbyte inst, sbyte lo, sbyte hi)
+{
+	assert(si_isInst(inst));
+	assert(lo < SINST_COUNT);
+	assert(hi < SINST_COUNT);
+
+	if (inst < lo) {
+		return SFALSE;
+	}
+
+	if (inst > hi) {
+		return SFALSE;
+	}
+
+	return STRUE;
+}
+
+sbool
+si_isMod(sbyte inst)
+{
+	assert(si_isInst(inst));
+	return isBetween(inst, SNOP0, SNOP3);
+}
+
+sbool
+si_isKey(sbyte inst)
+{
+	assert(si_isInst(inst));
+	return isBetween(inst, SKEYA, SKEYP);
+}
+
+sbool
+si_isLock(sbyte inst)
+{
+	assert(si_isInst(inst));
+	return isBetween(inst, SLOKA, SLOKP);
+}
+
+sbool
+si_keyLockMatch(sbyte key, sbyte lock)
+{
+	assert(si_isKey(key));
+	assert(si_isInst(lock));
+	return (key - SKEYA) == (lock - SLOKA);
+}
-- 
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