From e2998acc9d644d345a3a0ccdc8cabc3d0f2edece Mon Sep 17 00:00:00 2001
From: sowle <crypto.sowle@gmail.com>
Date: Sun, 7 Jul 2024 20:34:19 +0200
Subject: [PATCH] print_fixed_decimal_point() and print_money_brief() fixed for
 too big decimal point values

---
 .../epee/include/print_fixed_point_helper.h   |  2 ++
 src/currency_core/currency_format_utils.cpp   | 21 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/contrib/epee/include/print_fixed_point_helper.h b/contrib/epee/include/print_fixed_point_helper.h
index 91de1dd4..5a1eace8 100644
--- a/contrib/epee/include/print_fixed_point_helper.h
+++ b/contrib/epee/include/print_fixed_point_helper.h
@@ -36,6 +36,8 @@ namespace epee
     inline std::string print_fixed_decimal_point(t_number amount, size_t decimal_point)
     {
       std::string s = boost::lexical_cast<std::string>(amount);
+      if (decimal_point > 32)
+        return std::string("!!") + s; // avoiding overflow issues
       if (s.size() < decimal_point + 1)
       {
         s.insert(0, decimal_point + 1 - s.size(), '0');
diff --git a/src/currency_core/currency_format_utils.cpp b/src/currency_core/currency_format_utils.cpp
index c28a212d..afd632d7 100644
--- a/src/currency_core/currency_format_utils.cpp
+++ b/src/currency_core/currency_format_utils.cpp
@@ -3463,6 +3463,27 @@ namespace currency
   //---------------------------------------------------------------
   std::string print_money_brief(uint64_t amount, size_t decimal_point /* = CURRENCY_DISPLAY_DECIMAL_POINT */)
   {
+    // TODO: temporary fix for insanely big decimal points
+    // TODO: remove it after setting the limit to 18 -- sowle
+    if (decimal_point > 32)
+      return std::string("!!") + std::to_string(amount);
+    if (decimal_point >= 20)
+    {
+      std::string r = std::to_string(amount);
+      if (decimal_point + 1 > r.size())
+        r.insert(0, decimal_point - r.size() + 1, '0');
+      r.insert(r.begin() + 1, '.');
+      size_t p = r.find_last_not_of('0');
+      if (p != r.npos)
+      {
+        if (r[p] != '.' && p + 1 < r.size())
+          r.erase(p + 1);
+        else if (p + 2 < r.size())
+          r.erase(p + 2);
+      }
+      return r;
+    }
+
     uint64_t coin = decimal_point == CURRENCY_DISPLAY_DECIMAL_POINT ? COIN : crypto::constexpr_pow(decimal_point, 10);
     uint64_t remainder = amount % coin;
     amount /= coin;