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-rw-r--r--src/frontend/mame/ui/info.cpp17
1 files changed, 10 insertions, 7 deletions
diff --git a/src/frontend/mame/ui/info.cpp b/src/frontend/mame/ui/info.cpp
index 3e9623369a3..47935d26bd5 100644
--- a/src/frontend/mame/ui/info.cpp
+++ b/src/frontend/mame/ui/info.cpp
@@ -464,13 +464,16 @@ std::string machine_info::game_info_string() const
detail = _("Vector");
else
{
- std::string hz(std::to_string(u32(screen.frame_period().as_hz() * 1'000'000 + 0.5)));
- size_t dpos = hz.length() - 6;
- if (dpos == 0)
- hz.insert(dpos++, "0");
- hz.insert(dpos, ".");
- size_t last = hz.find_last_not_of('0');
- hz = hz.substr(0, last + (last != dpos ? 1 : 0));
+ const u32 rate = u32(screen.frame_period().as_hz() * 1'000'000 + 0.5);
+ const bool valid = rate >= 1'000'000;
+ std::string hz(valid ? std::to_string(rate) : "?");
+ if (valid)
+ {
+ size_t dpos = hz.length() - 6;
+ hz.insert(dpos, ".");
+ size_t last = hz.find_last_not_of('0');
+ hz = hz.substr(0, last + (last != dpos ? 1 : 0));
+ }
const rectangle &visarea = screen.visible_area();
detail = string_format("%d " UTF8_MULTIPLY " %d (%s) %s" UTF8_NBSP "Hz",