From 4a6d7da796e456115bbac92e056123f095a3780c Mon Sep 17 00:00:00 2001 From: Patrick Palka Date: Mon, 2 May 2022 07:00:48 -0400 Subject: [PATCH] libstdc++: case-sensitivity in hexfloat std::from_chars [PR105441] 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. (cherry picked from commit 576f975cabb0fd9843de152a2d247d486a967b08) --- libstdc++-v3/src/c++17/floating_from_chars.cc | 2 +- libstdc++-v3/testsuite/20_util/from_chars/7.cc | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/src/c++17/floating_from_chars.cc b/libstdc++-v3/src/c++17/floating_from_chars.cc index 13de1e3..e7f3a58 100644 --- a/libstdc++-v3/src/c++17/floating_from_chars.cc +++ b/libstdc++-v3/src/c++17/floating_from_chars.cc @@ -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; diff --git a/libstdc++-v3/testsuite/20_util/from_chars/7.cc b/libstdc++-v3/testsuite/20_util/from_chars/7.cc index 2a78c74..1aa9b23 100644 --- a/libstdc++-v3/testsuite/20_util/from_chars/7.cc +++ b/libstdc++-v3/testsuite/20_util/from_chars/7.cc @@ -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 }, -- 2.7.4