nano

commit 3fb8efc8f2ea9bc33560c8c8681509a9a7fc95cd
parent 9ae84071eb645beb8898469845b2f1a8dab9d901
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Fri, 22 Mar 2024 16:17:49 +0100

input: prevent 'macro_length' from underflowing when hammering M-:

Normally, when recording a macro, users will make their keystrokes
slowly and carefully, and will most likely wait to see the effect
of the previous keystroke before making the next.  So, the chances
of two `recordmacro` keystrokes coming in in quick succession is
normally nil.  The 'macro_length' variable just needs a guard to
prevent it from underflowing when someone is hammering the keys.

This fixes https://savannah.gnu.org/bugs/?65394 in a better way.

Diffstat:
M
src/winio.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/winio.c b/src/winio.c
@@ -91,7 +91,8 @@ void add_to_macrobuffer(int code)
 /* Remove the last key code plus any leading Esc codes from macro buffer. */
 void snip_last_keystroke(void)
 {
-	macro_length--;
+	if (macro_length > 0)
+		macro_length--;
 	while (macro_length > 0 && macro_buffer[macro_length - 1] == '\x1b')
 		macro_length--;
 }