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-rw-r--r--contrib/libreadline/chardefs.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/libreadline/chardefs.h b/contrib/libreadline/chardefs.h
index 664c1e4..aec704d 100644
--- a/contrib/libreadline/chardefs.h
+++ b/contrib/libreadline/chardefs.h
@@ -51,7 +51,7 @@
#define meta_character_bit 0x080 /* x0000000, must be on. */
#define largest_char 255 /* Largest character value. */
-#define CTRL_CHAR(c) ((c) < control_character_threshold && (c) >= 0)
+#define CTRL_CHAR(c) ((c) < control_character_threshold && (((c) & 0x80) == 0))
#define META_CHAR(c) ((c) > meta_character_threshold && (c) <= largest_char)
#define CTRL(c) ((c) & control_character_mask)
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