std format alternative

util/format.h

@@ -0,0 +1,28 @@
+#pragma once
+#include <cstdarg>
+#include <string>
+#include <vector>
+
+namespace trnr {
+
+// Formats a string (like printf) using a format string and variable arguments.
+inline std::string format(const char* fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	std::vector<char> buf(256);
+	int needed = vsnprintf(buf.data(), buf.size(), fmt, args);
+	va_end(args);
+
+	if (needed < 0) { return {}; }
+	if (static_cast<size_t>(needed) < buf.size()) { return std::string(buf.data(), needed); }
+
+	// Resize and try again if the buffer was too small
+	buf.resize(needed + 1);
+	va_start(args, fmt);
+	vsnprintf(buf.data(), buf.size(), fmt, args);
+	va_end(args);
+
+	return std::string(buf.data(), needed);
+}
+} // namespace trnr