From 2ccfb71d12d0ae1a8b4177c95aca45100982e685 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 11 Aug 2014 18:42:05 +0200
Subject: util/CharUtil: add ToLowerASCII()

---
 src/util/CharUtil.hxx | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/util')

diff --git a/src/util/CharUtil.hxx b/src/util/CharUtil.hxx
index 9cb852524..84a88a94e 100644
--- a/src/util/CharUtil.hxx
+++ b/src/util/CharUtil.hxx
@@ -126,4 +126,17 @@ ToUpperASCII(char ch)
 		: ch;
 }
 
+/**
+ * Convert the specified ASCII character (0x00..0x7f) to lower case.
+ * Unlike toupper(), it ignores the system locale.
+ */
+constexpr
+static inline char
+ToLowerASCII(char ch)
+{
+	return ch >= 'A' && ch <= 'Z'
+		? (ch + ('a' - 'A'))
+		: ch;
+}
+
 #endif
-- 
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