fix: copy va

build(deps): bump deps/GSL from `494e6e9` to `543d0dd`

src/utils/string.hpp

@@ -1,5 +1,6 @@
 #pragma once
 #include "memory.hpp"
+#include <cstdarg>
 #include <cstdint>
 
 template <class Type, std::size_t n>
@@ -29,12 +30,21 @@ namespace utils::string
 
 			while (true)
 			{
-				const auto res = vsnprintf(entry->buffer_, entry->size_, format, ap);
+				va_list ap_copy;
+				va_copy(ap_copy, ap);
 
-				if (res > 0) break; // Success
-				if (res == 0) return nullptr; // Error
+				const auto res = vsnprintf(entry->buffer_, entry->size_, format, ap_copy);
+				va_end(ap_copy);
 
-				entry->double_size();
+				if (res < 0) return nullptr; // Error
+
+				if (static_cast<std::size_t>(res) >= entry->size_)
+				{
+					entry->double_size();
+					continue;
+				}
+
+				break; // Success
 			}
 
 			return entry->buffer_;