Restrict UTF8IsAscii to char and unsigned char to avoid failures when (signed)

char passed.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/UniConversion.h b/src/UniConversion.h
index 73426beed..ead7aae57 100644
--- a/src/UniConversion.h
+++ b/src/UniConversion.h
@@ -48,10 +48,15 @@ inline constexpr bool UTF8IsTrailByte(unsigned char ch) noexcept {
 	return (ch >= 0x80) && (ch < 0xc0);
 }
 
-inline constexpr bool UTF8IsAscii(int ch) noexcept {
+inline constexpr bool UTF8IsAscii(unsigned char ch) noexcept {
 	return ch < 0x80;
 }
 
+inline constexpr bool UTF8IsAscii(char ch) noexcept {
+	const unsigned char uch = ch;
+	return uch < 0x80;
+}
+
 enum { UTF8MaskWidth=0x7, UTF8MaskInvalid=0x8 };
 int UTF8Classify(const unsigned char *us, size_t len) noexcept;
 inline int UTF8Classify(std::string_view sv) noexcept {