From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 5 May 2021 10:19:55 +0000 (+0100)
Subject: libstdc++: Use unsigned char argument to std::isdigit
X-Git-Tag: basepoints/gcc-13~7801
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0d6ca019717305df0ef41e3fe1da48f7f561fac;p=thirdparty%2Fgcc.git

libstdc++: Use unsigned char argument to std::isdigit

Passing plain char to isdigit is undefined if the value is negative.

libstdc++-v3/ChangeLog:

	* include/std/charconv (__from_chars_alnum): Pass unsigned
	char to std::isdigit.
---

diff --git a/libstdc++-v3/include/std/charconv b/libstdc++-v3/include/std/charconv
index 193702e677a6..571be075a6b3 100644
--- a/libstdc++-v3/include/std/charconv
+++ b/libstdc++-v3/include/std/charconv
@@ -565,7 +565,7 @@ namespace __detail
       while (__first != __last)
 	{
 	  unsigned char __c = *__first;
-	  if (std::isdigit(__c))
+	  if (std::isdigit(static_cast<unsigned char>(__c)))
 	    __c -= '0';
 	  else
 	    {