From d9967c2638052730c6eeb1624586d633d6482003 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <campbell+ledger@mumble.net>
Date: Sat, 27 Apr 2024 19:54:23 +0000
Subject: Avoid ctype abuse.

fix https://github.com/ledger/ledger/issues/2338
fix https://github.com/ledger/ledger/issues/2340
---
 src/option.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/option.cc')

diff --git a/src/option.cc b/src/option.cc
index 43dd853c..44b135e6 100644
--- a/src/option.cc
+++ b/src/option.cc
@@ -132,7 +132,8 @@ void process_environment(const char ** envp, const string& tag,
         if (*q == '_')
           *r++ = '-';
         else
-          *r++ = static_cast<char>(std::tolower(*q));
+          *r++ = static_cast<char>(std::tolower(
+            static_cast<unsigned char>(*q)));
       *r = '\0';
 
       if (*q == '=') {
-- 
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