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authorDenis Vlasenko2008-10-18 19:37:41 +0000
committerDenis Vlasenko2008-10-18 19:37:41 +0000
commite3742f4217e46f42c4f0506c23b04b84fc31e7ad (patch)
treead27f4554ff46fbdf27193aac46806e9d6a8baab /editors/vi.c
parent3ab3d8a5cfb1cfd6d2fceeea93066c4e63e5f22d (diff)
downloadbusybox-e3742f4217e46f42c4f0506c23b04b84fc31e7ad.zip
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vi: explain why reading 4 chars is unsafe
Diffstat (limited to 'editors/vi.c')
-rw-r--r--editors/vi.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/editors/vi.c b/editors/vi.c
index acbede3..8944f77 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: