From 736f13cb421604cf68f3e078e5bf0b82e0ffbc92 Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <jak@debian.org>
Date: Thu, 9 Dec 2021 11:52:12 +0100
Subject: Introduce and use isalpha_ascii() in debversion rather than isalpha()

Avoid misclassifying additional alphabetical characters from
certain locales as alpha and then sort them by ASCII...
---
 apt-pkg/contrib/strutl.h  | 15 +++++++++++++++
 apt-pkg/deb/debversion.cc |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index b6e6bfdce..8439af6fe 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -144,6 +144,21 @@ static inline int isspace_ascii_inline(int const c)
    // 9='\t',10='\n',11='\v',12='\f',13='\r',32=' '
    return (c >= 9 && c <= 13) || c == ' ';
 }
+APT_PURE APT_HOT
+static inline int islower_ascii(int const c)
+{
+   return c >= 'a' && c <= 'z';
+}
+APT_PURE APT_HOT
+static inline int isupper_ascii(int const c)
+{
+   return c >= 'A' && c <= 'Z';
+}
+APT_PURE APT_HOT
+static inline int isalpha_ascii(int const c)
+{
+   return isupper_ascii(c) || islower_ascii(c);
+}
 
 APT_PUBLIC std::string StripEpoch(const std::string &VerStr);
 
diff --git a/apt-pkg/deb/debversion.cc b/apt-pkg/deb/debversion.cc
index d2ebd2805..005f1bce0 100644
--- a/apt-pkg/deb/debversion.cc
+++ b/apt-pkg/deb/debversion.cc
@@ -40,7 +40,7 @@ static int order(char c)
 {
    if (isdigit(c))
       return 0;
-   else if (isalpha(c))
+   else if (isalpha_ascii(c))
       return c;
    else if (c == '~')
       return -1;
-- 
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