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[PR #7939] Add support for the DECREQTPARM report #27034

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opened 2026-01-31 09:19:36 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:19:36 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/7939

State: closed
Merged: Yes

This PR adds support for the DECREQTPARM (Request Terminal Parameters)
escape sequence, which was originally used on the VT100 terminal to
report the serial communication parameters. Modern terminal emulators
simply hardcode the reported values for backward compatibility.

The DECREQTPARM sequence has one parameter, which was originally used
to tell the terminal whether it was permitted to send unsolicited
reports or not. However, since we have no reason to send an unsolicited
report, we don't need to keep track of that state, but the permission
parameter does still determine the value of the first parameter in the
response.

The response parameters are as follows:

Parameter Value Meaning
response type 2 or 3 unsolicited or solicited
parity 1 no parity
data bits 1 8 bits per character
transmit speed 128 38400 baud
receive speed 128 38400 baud
clock multiplier 1
flags 0

There is some variation in the baud rate reported by modern terminal
emulators, and 9600 baud seems to be a little more common than 38400
baud, but I thought the higher speed was probably more appropriate,
especially since that's also the value reported by XTerm.

Validation Steps Performed

I've added a couple of adapter and output engine tests to verify that
the sequence is dispatched correctly, and the expected responses are
generated. I've also manually tested in Vttest and confirmed that we now
pass the DECREQTPARM test in the Test of terminal reports.

Closes #7852

**Original Pull Request:** https://github.com/microsoft/terminal/pull/7939 **State:** closed **Merged:** Yes --- This PR adds support for the `DECREQTPARM` (Request Terminal Parameters) escape sequence, which was originally used on the VT100 terminal to report the serial communication parameters. Modern terminal emulators simply hardcode the reported values for backward compatibility. The `DECREQTPARM` sequence has one parameter, which was originally used to tell the terminal whether it was permitted to send unsolicited reports or not. However, since we have no reason to send an unsolicited report, we don't need to keep track of that state, but the permission parameter does still determine the value of the first parameter in the response. The response parameters are as follows: | Parameter | Value | Meaning | | ---------------- | ------ | ------------------------ | | response type | 2 or 3 | unsolicited or solicited | | parity | 1 | no parity | | data bits | 1 | 8 bits per character | | transmit speed | 128 | 38400 baud | | receive speed | 128 | 38400 baud | | clock multiplier | 1 | | | flags | 0 | | There is some variation in the baud rate reported by modern terminal emulators, and 9600 baud seems to be a little more common than 38400 baud, but I thought the higher speed was probably more appropriate, especially since that's also the value reported by XTerm. ## Validation Steps Performed I've added a couple of adapter and output engine tests to verify that the sequence is dispatched correctly, and the expected responses are generated. I've also manually tested in Vttest and confirmed that we now pass the `DECREQTPARM` test in the _Test of terminal reports_. Closes #7852
claunia added the pull-request label 2026-01-31 09:19:36 +00:00
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Reference: starred/terminal#27034
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