Fix signed integer overflow on x = 0, detected by GCC sanitizer

diff --git a/src/support/lstrings.cpp b/src/support/lstrings.cpp
index f0e79b88b39bf2d64efafbc0f87f565cb85d5688..9aac66a7542616023220622b19c741130a7c5dc8 100644 (file)
--- a/src/support/lstrings.cpp
+++ b/src/support/lstrings.cpp
@@ -1446,8 +1446,8 @@ std::string formatFPNumber(double x)
        os << std::fixed;
        // Prevent outputs of 23.4200000000000017 but output small numbers
        // with at least 6 significant digits.
-       double const logarithm = log10(fabs(x));
-       os << std::setprecision(max(6 - iround(logarithm), 0)) << x;
+       int const precision = (x == 0.0) ? 0 : max(6 - iround(log10(fabs(x))), 0);
+       os << std::setprecision(precision) << x;
        string result = os.str();
        if (result.find('.') != string::npos) {
                result = rtrim(result, "0");