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fixing issue 261

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This commit is contained in:
Daniel Lemire 2024-08-22 15:40:29 -04:00
parent 3642e92a36
commit 311e4c20d4
2 changed files with 14 additions and 2 deletions
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5
include/fast_float/parse_number.h
View File

@ -199,7 +199,7 @@ from_chars(UC const *first, UC const *last, T &value,
template <typename T, typename UC>
FASTFLOAT_CONSTEXPR20 from_chars_result_t<UC>
from_chars_advanced(parsed_number_string_t<UC> &pns, T &value) noexcept {
printf("from_chars_advanced\n");
static_assert(is_supported_float_type<T>(),
"only some floating-point types are supported");
static_assert(is_supported_char_type<UC>(),
@ -275,11 +275,12 @@ from_chars_advanced(parsed_number_string_t<UC> &pns, T &value) noexcept {
if (am.power2 < 0) {
am = digit_comp<T>(pns, am);
}
to_float(pns.negative, am, value);
// Test for over/underflow.
if ((pns.mantissa != 0 && am.mantissa == 0 && am.power2 == 0) ||
am.power2 == binary_format<T>::infinite_power()) {
answer.ec = std::errc::result_out_of_range;
} else {
to_float(pns.negative, am, value);
}
return answer;
}

11
tests/basictest.cpp
View File

@ -76,6 +76,15 @@ const char *round_name(int d) {
#define FASTFLOAT_STR(x) #x
#define SHOW_DEFINE(x) printf("%s='%s'\n", #x, FASTFLOAT_STR(x))
TEST_CASE("issue261") {
std::string_view str = "5.47382e-48";
float value = 100.0f;
auto res = fast_float::from_chars(str.data(), str.data() + str.size(), value, fast_float::general);
CHECK_MESSAGE(res.ec == std::errc::result_out_of_range, "value is out of range (interpretation of the standard)");
std::cout << "value = " << fHexAndDec(value) << std::endl;
CHECK_MESSAGE(value == 100.0f, "value should be unchanged");
CHECK_MESSAGE(res.ptr == str.data() + str.size(), "should point to end of matching pattern");
}
TEST_CASE("system_info") {
std::cout << "system info:" << std::endl;
#ifdef FASTFLOAT_CONSTEXPR_TESTS
@ -400,6 +409,8 @@ TEST_CASE("full_multiplication") {
test_full_multiplication(bit << 63, bit << 63, 0u, bit << 62);
}
TEST_CASE("issue8") {
const char *s =
"3."