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Ignore C1 control codes

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C1 control codes are not used nowadays and just risks messing up
the terminal when they are used by accident.
This commit is contained in:
Fredrik Fornwall 2017-06-26 01:28:18 +02:00
parent 7913e765d5
commit f9a565d1e0
1 changed files with 5 additions and 4 deletions
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9
terminal-emulator/src/main/java/com/termux/terminal/TerminalEmulator.java
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@ -419,10 +419,11 @@ public final class TerminalEmulator {
mUtf8Index = mUtf8ToFollow = 0;
if (codePoint >= 0x80 && codePoint <= 0x9F) {
// Sequence decoded to a C1 control character which is the same as escape followed by
// ((code & 0x7F) + 0x40).
processCodePoint(/* escape (hexadecimal=0x1B, octal=033): */27);
processCodePoint((codePoint & 0x7F) + 0x40);
// Sequence decoded to a C1 control character which we ignore. They are
// not used nowadays and increases the risk of messing up the terminal state
// on binary input. XTerm does not allow them in utf-8:
// "It is not possible to use a C1 control obtained from decoding the
// UTF-8 text" - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
} else {
switch (Character.getType(codePoint)) {
case Character.UNASSIGNED: