From 4dd6867532b3e1b43ee5d5efc2f06912aff4cdf0 Mon Sep 17 00:00:00 2001
From: Rahim Kanji <rahim.kanji@outlook.com>
Date: Sun, 27 Oct 2024 18:24:14 +0500
Subject: [PATCH] Added overflow_safe_multiply()

---
 include/gen_utils.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/gen_utils.h b/include/gen_utils.h
index 4eb6e1c9c0..3b2cea7708 100644
--- a/include/gen_utils.h
+++ b/include/gen_utils.h
@@ -314,6 +314,18 @@ inline unsigned long long realtime_time() {
   return (((unsigned long long) ts.tv_sec) * 1000000) + (ts.tv_nsec / 1000);
 }
 
+template<int FACTOR, typename T>
+inline T overflow_safe_multiply(T val) {
+	static_assert(std::is_integral<T>::value, "T must be an integer type.");
+	static_assert(std::is_unsigned_v<T>, "T must be an unsigned integer type.");
+	static_assert(FACTOR > 0, "Negative factors are not supported.");
+
+	if constexpr (FACTOR == 0) return 0;
+	if (val == 0)  return 0;
+	if (val > std::numeric_limits<T>::max() / FACTOR) return std::numeric_limits<T>::max();
+	return (val * FACTOR);
+}
+
 #endif /* __GEN_FUNCTIONS */
 
 bool Proxy_file_exists(const char *);