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vi: explain why reading 4 chars is unsafe

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This commit is contained in:
Denis Vlasenko 2008-10-18 19:37:41 +00:00
parent 3ab3d8a5cf
commit e3742f4217
1 changed files with 5 additions and 3 deletions
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8
editors/vi.c
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@ -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: