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-rw-r--r--src/util/CharUtil.hxx13
1 files changed, 13 insertions, 0 deletions
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