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screen: Allow for doubled escapes in the tmux sequence

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See
https://github.com/tmux/tmux/wiki/FAQ#what-is-the-passthrough-escape-sequence-and-how-do-i-use-it.
This commit is contained in:
Fabian Homborg 2021-08-30 18:08:42 +02:00
parent 4194977569
commit ac7e3a53c1
1 changed files with 29 additions and 10 deletions
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39
src/screen.cpp
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@ -105,21 +105,40 @@ static bool is_screen_name_escape_seq(const wchar_t *code, size_t *resulting_len
// so we can just handle them here.
static const wchar_t *tmux_seq = L"Ptmux;";
static const size_t tmux_seq_len = std::wcslen(tmux_seq);
bool is_tmux = false;
if (code[1] != L'k') {
if (wcsncmp(&code[1], tmux_seq, tmux_seq_len) != 0) {
if (wcsncmp(&code[1], tmux_seq, tmux_seq_len) == 0) {
is_tmux = true;
} else {
return false;
}
}
const wchar_t *const screen_name_end_sentinel = L"\x1B\\";
const wchar_t *screen_name_end = std::wcsstr(&code[2], screen_name_end_sentinel);
if (screen_name_end == nullptr) {
// Consider just <esc>k to be the code.
// (note: for the tmux sequence this is broken, but since we have no idea...)
*resulting_length = 2;
} else {
const wchar_t *escape_sequence_end =
screen_name_end + std::wcslen(screen_name_end_sentinel);
*resulting_length = escape_sequence_end - code;
size_t offset = 2;
while (true) {
const wchar_t *screen_name_end = std::wcsstr(&code[offset], screen_name_end_sentinel);
if (screen_name_end == nullptr) {
// Consider just <esc>k to be the code.
// (note: for the tmux sequence this is broken, but since we have no idea...)
*resulting_length = 2;
break;
} else {
// The tmux sequence requires that all escapes in the payload sequence
// be doubled. So if we have \e\e\\ that's still not the end.
if (is_tmux) {
size_t esc_count = 0;
const wchar_t *i = screen_name_end;
while (i > code && *(i - 1) == L'\x1B' && --i) esc_count++;
if (esc_count % 2 == 1) {
offset=screen_name_end - code + 1;
continue;
}
}
const wchar_t *escape_sequence_end =
screen_name_end + std::wcslen(screen_name_end_sentinel);
*resulting_length = escape_sequence_end - code;
break;
}
}
return true;
}