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-rw-r--r--editors/vi.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/editors/vi.c b/editors/vi.c
index acbede359..8944f770a 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2243,9 +2243,11 @@ static char readit(void) // read (maybe cursor) key from stdin
n = chars_to_parse;
if (n == 0) {
- // If no data, block waiting for input
- // (can't read more than minimal ESC sequence -
- // see "n = 0" below).
+ // If no data, block waiting for input.
+ // Can't read more than minimal ESC sequence size -
+ // see "n = 0" below. Example of mishandled
+ // sequence if we read 4 chars here: "ESC O A ESC O A".
+ // We'll read "ESC O A ESC" and lose second ESC!
n = safe_read(0, readbuffer, 3);
if (n <= 0) {
error: