Closes #19

core/dbc_statement_handler.cpp

@@ -35,14 +35,18 @@ namespace {
                 R"(^[+-]?(?:[0-9]+(?:\.[0-9]*)?|\.[0-9]+)(?:[eE][+-]?[0-9]+)?$)");
         if (!std::regex_match(text, number))
             throw std::runtime_error(std::string("Invalid ") + field + ": " + text);
-        std::size_t consumed = 0U;
-        double value;
-        try {
-            value = std::stod(text, &consumed);
-        } catch (const std::exception &) {
-            throw std::runtime_error(std::string("Invalid ") + field + ": " + text);
-        }
-        if (consumed != text.size() || !std::isfinite(value))
+        // Floating-point from_chars is locale-independent and does not accept
+        // a leading '+', which the DBC numeric grammar permits.
+        const char *begin = text.data();
+        const char *end = begin + text.size();
+        if (*begin == '+')
+            ++begin;
+        double value = 0.0;
+        const std::from_chars_result parsed =
+                std::from_chars(begin, end, value, std::chars_format::general);
+        // Keep the existing rejection of conversion underflow into subnormal values.
+        if (parsed.ec != std::errc() || parsed.ptr != end || !std::isfinite(value) ||
+            std::fpclassify(value) == FP_SUBNORMAL)
             throw std::runtime_error(std::string("Invalid ") + field + ": " + text);
         return value;
     }