From 708fff700f36ab3c2ab107b984ec9f3b8be5f055 Mon Sep 17 00:00:00 2001
From: Mikael Persson <mikael.s.persson@gmail.com>
Date: Tue, 10 Jun 2025 20:45:26 -0400
Subject: Fixed undefined behavior with log10 cast of fractional doubles (#276)

---
 include/toml++/impl/toml_formatter.inl | 2 +-
 toml.hpp                               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/toml++/impl/toml_formatter.inl b/include/toml++/impl/toml_formatter.inl
index 201de9ce9e..8b4f633dca 100644
--- a/include/toml++/impl/toml_formatter.inl
+++ b/include/toml++/impl/toml_formatter.inl
@@ -91,7 +91,7 @@ TOML_ANON_NAMESPACE_START
 					weight += 1u;
 					val *= -1.0;
 				}
-				return weight + static_cast<size_t>(log10(val)) + 1u;
+				return weight + static_cast<size_t>(abs(log10(val))) + 1u;
 			}
 
 			case node_type::boolean: return 5u;
diff --git a/toml.hpp b/toml.hpp
index ef3515b136..8fe1a0d5b8 100644
--- a/toml.hpp
+++ b/toml.hpp
@@ -17107,7 +17107,7 @@ TOML_ANON_NAMESPACE_START
 					weight += 1u;
 					val *= -1.0;
 				}
-				return weight + static_cast<size_t>(log10(val)) + 1u;
+				return weight + static_cast<size_t>(abs(log10(val))) + 1u;
 			}
 
 			case node_type::boolean: return 5u;
-- 
cgit 0.0.5-2-1-g0f52