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libstdc++: case-sensitivity in hexfloat std::from_chars [PR105441]

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The hexfloat parser for binary32/64 added in r12-6645-gcc3bf3404e4b1c
overlooked that the exponent part can also begin with an uppercase 'P'.

	PR libstdc++/105441

libstdc++-v3/ChangeLog:

	* src/c++17/floating_from_chars.cc (__floating_from_chars_hex):
	Also accept 'P' as the start of the exponent.
	* testsuite/20_util/from_chars/7.cc: Add corresponding testcase.
This commit is contained in:
Patrick Palka 2022-05-02 07:00:48 -04:00
parent 02f03c5c82
commit 576f975cab
2 changed files with 2 additions and 1 deletions
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2
libstdc++-v3/src/c++17/floating_from_chars.cc
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@ -664,7 +664,7 @@ namespace
// Parse the written exponent.
int written_exponent = 0;
if (first != last && *first == 'p')
if (first != last && (*first == 'p' || *first == 'P'))
{
// Tentatively consume the 'p' and try to parse a decimal number.
const char* const fallback_first = first;

1
libstdc++-v3/testsuite/20_util/from_chars/7.cc
View File

@ -96,6 +96,7 @@ constexpr testcase testcases[] = {
{ "1p-1", 4, {}, 0x1p-1 },
{ "0", 1, {}, 0.0 },
{ "A", 1, {}, 0xA },
{ "1.ABCDEFP+10", 12, {}, 0x1.ABCDEFP+10 },
{ "-1", 2, {}, -1.0 },
{ "-0", 2, {}, -0.0 },
{ "42", 2, {}, 0x42p0 },