From 21fe64b59cd30ae4e3263a2c7731b39b15703c5f Mon Sep 17 00:00:00 2001
From: tastytea <tastytea@tastytea.de>
Date: Thu, 25 Jul 2019 02:57:10 +0200
Subject: [PATCH] Fixed to_lowercase().

Converting some text to lowercase caused range errors. I don't really
know what I'm doing here, so I replaced the code with this answer from
StackOverflow: <https://stackoverflow.com/a/21395>. It works now,
let's hope it stays that way.
---
 src/search.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index a067427..4c0c8a7 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -62,12 +62,12 @@ const vector<vector<string>> parse_expression(string expression)
 
 const string to_lowercase(const string &str)
 {
-    std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
-    std::wstring in = converter.from_bytes(str);
-    std::wstring out;
-
-    std::transform(in.begin(), in.end(), std::back_inserter(out), ::towlower);
-    return converter.to_bytes(out);
+    string out;
+    std::locale loc("");
+    const std::ctype<char>& ct = std::use_facet<std::ctype<char>>(loc);
+    std::transform(str.begin(), str.end(), std::back_inserter(out),
+                   std::bind1st(std::mem_fun(&std::ctype<char>::tolower), &ct));
+    return out;
 }
 
 const vector<Database::entry>