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Fix handling of zero precision

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This commit is contained in:
Victor Zverovich 2022-02-18 12:12:55 -08:00
parent b6d56170fc
commit 2c8cd2db34
3 changed files with 7 additions and 1 deletions
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3
include/fmt/format-inl.h
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@ -2246,7 +2246,8 @@ FMT_HEADER_ONLY_CONSTEXPR20 int format_float(Float value, int precision,
precision = handler.precision;
}
} else {
exp = static_cast<int>(std::log10(value));
// Use floor because 0.9 = 9e-1.
exp = static_cast<int>(std::floor(std::log10(value)));
if (fixed) adjust_precision(precision, exp + 1);
}
if (use_dragon) {

2
include/fmt/format.h
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@ -2256,6 +2256,8 @@ FMT_CONSTEXPR20 auto write(OutputIt out, T value,
throw_format_error("number is too big");
else
++precision;
} else if (fspecs.format != float_format::fixed && precision == 0) {
precision = 1;
}
if (const_check(std::is_same<T, float>())) fspecs.binary32 = true;
if (!std::numeric_limits<T>::is_iec559 || std::numeric_limits<T>::digits > 64)

3
test/format-test.cc
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@ -948,6 +948,9 @@ TEST(format_test, precision) {
EXPECT_THAT(outputs,
testing::Contains(fmt::format("{:.838A}", -2.14001164E+38)));
auto ld = 8.43821965335442234493E-4933L;
EXPECT_EQ(fmt::format("{:.0}", ld), ld != 0 ? "8e-4933" : "0");
EXPECT_EQ("123.", fmt::format("{:#.0f}", 123.0));
EXPECT_EQ("1.23", fmt::format("{:.02f}", 1.234));
EXPECT_EQ("0.001", fmt::format("{:.1g}", 0.001));