SmallString: Add append_vformat()

src/common/small_string.cpp

@@ -526,6 +526,11 @@ std::span<u8> SmallStringBase::bspan()
   return std::span<u8>(reinterpret_cast<u8*>(m_buffer), m_length);
 }
 
+void SmallStringBase::append_vformat(fmt::string_view fmt, fmt::format_args args)
+{
+  fmt::vformat_to(std::back_inserter(*this), fmt, args);
+}
+
 void SmallStringBase::vformat(fmt::string_view fmt, fmt::format_args args)
 {
   clear();

src/common/small_string.h

@@ -66,6 +66,7 @@ public:
 
   template<typename... T>
   void append_format(fmt::format_string<T...> fmt, T&&... args);
+  void append_vformat(fmt::string_view fmt, fmt::format_args args);
 
   // append hex string
   void append_hex(const void* data, size_t len, bool comma_separate = false);
@@ -100,7 +101,6 @@ public:
 
   template<typename... T>
   void format(fmt::format_string<T...> fmt, T&&... args);
-
   void vformat(fmt::string_view fmt, fmt::format_args args);
 
   // compare one string to another