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Convert negative precision to zero in printf (#1127)

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and remove redundant check in grisu2_prettify.
This commit is contained in:
Victor Zverovich 2019-04-21 07:39:41 -07:00
parent 5efb24dd2b
commit bd516e3429
3 changed files with 7 additions and 4 deletions
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3
include/fmt/format.h
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@ -1181,8 +1181,7 @@ It grisu2_prettify(const char* digits, int size, int exp, It it,
*it++ = static_cast<Char>(params.upper ? 'E' : 'e');
return write_exponent<Char>(exp, it);
}
const int exp_threshold = 21;
if (size <= full_exp && full_exp <= exp_threshold) {
if (size <= full_exp) {
// 1234e7 -> 12340000000[.0+]
it = copy_str<Char>(digits, digits + size, it);
it = std::fill_n(it, full_exp - size, static_cast<Char>('0'));

2
include/fmt/printf.h
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@ -44,7 +44,7 @@ class printf_precision_handler : public function<int> {
int operator()(T value) {
if (!int_checker<std::numeric_limits<T>::is_signed>::fits_in_int(value))
FMT_THROW(format_error("number is too big"));
return static_cast<int>(value);
return (std::max)(static_cast<int>(value), 0);
}
template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>

6
test/printf-test.cc
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@ -520,6 +520,10 @@ TEST(PrintfTest, CheckFormatStringRegression) {
check_format_string_regression("%c%s", 'x', "");
}
TEST(PrintfTest, FixedLargeExponent) {
EXPECT_EQ("1000000000000000000000", fmt::sprintf("%.*f", -13, 1e21));
}
TEST(PrintfTest, VSPrintfMakeArgsExample) {
fmt::format_arg_store<fmt::printf_context, int, const char*> as{42,
"something"};
@ -599,7 +603,7 @@ std::string custom_format(const char* format_str, const Args&... args) {
return custom_vformat(format_str, va);
}
TEST(CustomFormatterTest, Format) {
TEST(PrintfTest, CustomFormat) {
EXPECT_EQ("0.00", custom_format("%.2f", -.00001));
EXPECT_EQ("0.00", custom_format("%.2f", .00001));
EXPECT_EQ("1.00", custom_format("%.2f", 1.00001));