sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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MFhead@r344527

Merge ^/head r344178 through r344512.

Attempt to complete fixing programmable function keys for syscons.

The flag for the driver capability of supporting the fix is independent
of the flag for cons25 mode so that it can be managed indep

Attempt to complete fixing programmable function keys for syscons.

The flag for the driver capability of supporting the fix is independent
of the flag for cons25 mode so that it can be managed independently, but
I forget to preserve it when resetting the terminal.

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Place an upper bound on the number of iterations for REP.

Right now it's possible to invoke the REP escape sequence with a maximum
of tens of millions of iterations. In practice, there is never any

Place an upper bound on the number of iterations for REP.

Right now it's possible to invoke the REP escape sequence with a maximum
of tens of millions of iterations. In practice, there is never any need
to do this. Calling it more frequently than the number of cells in the
terminal hardly makes any sense. By placing a limit on it, we can
prevent users from exhausting resources in inside the terminal emulator.

As support for this escape sequence is not present in any of the stable
branches, there is no need to MFC.

Reported by: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11255

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Add missing __unused attributes to unused function arguments.

This fixes the userspace build of libteken.

Merge ^/head r339015 through r339669.

Implement ECMA-48 "REP", some Linuxen have started emitting them recently.

Approved by: ed

teken: Rename the "Set Cursor Style" sequence to match vt100.net docs

This fixes inconsistencies with the rest of the `sequences` file.

No functional changes.

Requested by: ed

teken, vt(4): Parse the "Cursor style" escape sequence

The escape sequence (e.g. `^[[2 q`) was unsupported before and the
letter `q` was displayed as a typed character. The sequence is used by
Neovi

teken, vt(4): Parse the "Cursor style" escape sequence

The escape sequence (e.g. `^[[2 q`) was unsupported before and the
letter `q` was displayed as a typed character. The sequence is used by
Neovim for instance.

Now, it is properly parsed. However, it is ignored, so it won't change
the cursor style.

Because the escape sequence contains a space character, the
`gensequences` script had to be modified to support that. In the
`sequences` file, a space is represented as the string `SP`.

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Pedantic polishing of code to please FlexeLint.

Approved by: ed

sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
pro

sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

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Merge from head

Sponsored by: Gandi.net

Finish merging from head, messed up in previous attempt

Merge r286744-r287584 from head.

Merge ^/head r286858 through r287489.

Merge from HEAD

Sync HPA and VPA implementations with CUP.

After fixing the 16-bits integer arithmetic overflow in 286981, we
should also make sure to fix the VPA sequence. Bring HPA and VPA in sync
with how we now

Sync HPA and VPA implementations with CUP.

After fixing the 16-bits integer arithmetic overflow in 286981, we
should also make sure to fix the VPA sequence. Bring HPA and VPA in sync
with how we now implement CUP.

PR: 202612
Reported by: kcwu csie org
MFC after: 1 month

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Don't truncate cursor arithmetic to 16 bits.

When updating the row number when the cursor position escape sequence is
issued, we should make sure to store the intermediate result in a 32-bit
integer

Don't truncate cursor arithmetic to 16 bits.

When updating the row number when the cursor position escape sequence is
issued, we should make sure to store the intermediate result in a 32-bit
integer. If we fail to do this, the cursor may be set above the origin
region, which is bad.

This could cause libteken to crash when INVARIANTS is enabled, due to
the strict set of assertions that libteken has.

PR: 202540
Reported by: kcwu csie org
MFC after: 1 month

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r262222 (last merge was incomplete).

MFC @ r259205 in preparation for some SVM updates. (for real this time)