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fix #276: parse_infnan handles FASTFLOAT_ALLOWS_LEADING_PLUS correctly

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Anders Dalvander 2024-11-17 16:23:01 +01:00
parent 72b2a7382a
commit 23787fc71a
2 changed files with 7 additions and 9 deletions
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CONTRIBUTORS
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@ -8,3 +8,4 @@ Lénárd Szolnoki
Jan Pharago Jan Pharago
Maya Warrier Maya Warrier
Taha Khokhar Taha Khokhar
Anders Dalvander

15
include/fast_float/parse_number.h
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@ -25,18 +25,15 @@ from_chars_result_t<UC> FASTFLOAT_CONSTEXPR14 parse_infnan(UC const *first,
from_chars_result_t<UC> answer{}; from_chars_result_t<UC> answer{};
answer.ptr = first; answer.ptr = first;
answer.ec = std::errc(); // be optimistic answer.ec = std::errc(); // be optimistic
bool minusSign = false; bool const minusSign = (*first == UC('-')); // assume first < last, so dereference without checks;
if (*first ==
UC('-')) { // assume first < last, so dereference without checks;
// C++17 20.19.3.(7.1) explicitly forbids '+' here
minusSign = true;
++first;
}
#ifdef FASTFLOAT_ALLOWS_LEADING_PLUS // disabled by default #ifdef FASTFLOAT_ALLOWS_LEADING_PLUS // disabled by default
if (*first == UC('+')) { if ((*first == UC('-')) || (*first == UC('+'))) {
#else
// C++17 20.19.3.(7.1) explicitly forbids '+' sign here
if (*first == UC('-')) {
#endif
++first; ++first;
} }
#endif
if (last - first >= 3) { if (last - first >= 3) {
if (fastfloat_strncasecmp(first, str_const_nan<UC>(), 3)) { if (fastfloat_strncasecmp(first, str_const_nan<UC>(), 3)) {
answer.ptr = (first += 3); answer.ptr = (first += 3);