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Fix possible UB in the sum_string_vector function (TypeTools.hpp) (#893)

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Fixes #892 Undefined behavior in comparison of doubles.
This commit is contained in:
Artem Trokhymchuk 2023-06-28 02:53:34 +03:00 committed by GitHub
parent a1135bb30c
commit dce7983efa
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2 changed files with 6 additions and 8 deletions
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11
include/CLI/TypeTools.hpp
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@ -1652,13 +1652,10 @@ inline std::string sum_string_vector(const std::vector<std::string> &values) {
output.append(arg);
}
} else {
if(val <= static_cast<double>((std::numeric_limits<std::int64_t>::min)()) ||
val >= static_cast<double>((std::numeric_limits<std::int64_t>::max)()) ||
std::ceil(val) == std::floor(val)) {
output = detail::value_string(static_cast<int64_t>(val));
} else {
output = detail::value_string(val);
}
std::ostringstream out;
out.precision(16);
out << val;
output = out.str();
}
return output;
}

3
tests/AppTest.cpp
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@ -11,6 +11,7 @@
#include <complex>
#include <cstdint>
#include <cstdlib>
#include <limits>
TEST_CASE_METHOD(TApp, "OneFlagShort", "[app]") {
app.add_flag("-c,--count");
@ -828,7 +829,7 @@ TEST_CASE_METHOD(TApp, "SumOptFloat", "[app]") {
run();
CHECK(0.6 == val);
CHECK(std::fabs(0.6 - val) <= std::numeric_limits<double>::epsilon());
}
TEST_CASE_METHOD(TApp, "SumOptString", "[app]") {