From: Patrick Palka <ppalka@redhat.com>
Date: Mon, 2 May 2022 11:00:48 +0000 (-0400)
Subject: libstdc++: case-sensitivity in hexfloat std::from_chars [PR105441]
X-Git-Tag: basepoints/gcc-14~7138
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=576f975cabb0fd9843de152a2d247d486a967b08;p=thirdparty%2Fgcc.git

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.
---

diff --git a/libstdc++-v3/src/c++17/floating_from_chars.cc b/libstdc++-v3/src/c++17/floating_from_chars.cc
index 13de1e346ab..e7f3a58cf18 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 2a78c7441e2..1aa9b230531 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 },