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ptyfwd: document why we only honour two of the three kinds of ST

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Lennart Poettering 2024-10-31 10:10:37 +01:00
parent b8311af810
commit de0ebee637
1 changed files with 10 additions and 5 deletions
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15
src/shared/ptyfwd.c
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@ -507,11 +507,16 @@ static int pty_forward_ansi_process(PTYForward *f, size_t offset) {
} else {
/* Otherwise, the OSC sequence is over
*
* There are two allowed ways to end an OSC sequence:
* BEL '\x07'
* String Terminator (ST): <Esc>\ - "\x1b\x5c"
* since we cannot lookahead to see if the Esc is followed by a \
* we cut a corner here and assume it will be \. */
* There are three documented ways to end an OSC sequence:
* 1. BEL aka ^G aka \x07
* 2. \x9c
* 3. \x1b\x5c
* since we cannot look ahead to see if the Esc is followed by a "\"
* we cut a corner here and assume it will be "\"e.
*
* Note that we do not support \x9c here, because that's also a valid UTF8
* codepoint, and that would create ambiguity. Various terminal emulators
* similar do not support it. */
if (IN_SET(c, '\x07', '\x1b')) {
r = insert_window_title_fix(f, i+1);