ignore C1 control characters in UTF-8 mode

Ignore processing and printing C1 control characters in UTF-8 mode.
These are in the range: 0x80 - 0x9f.

By default in st the mode is set to UTF-8.

This matches more the behaviour of xterm with the options -u8 or +u8 also.
Also see the xterm resource "allowC1Printable".

Let me know if this breaks something, in most cases I don't think so.

As usual a very good reference is:
https://invisible-island.net/xterm/ctlseqs/ctlseqs.html

Ref.
https://git.suckless.org/st/commit/211964d56ee00a7d46e251cbc150afb79138ae37.html
This commit is contained in:
Bakkeby 2023-04-07 14:30:23 +02:00
parent 18e7dc5545
commit 1343b29ee5
2 changed files with 4 additions and 1 deletions

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@ -1,4 +1,4 @@
Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9 (e5e9598, 2022-10-25) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more. Similar to [dwm-flexipatch](https://github.com/bakkeby/dwm-flexipatch) this st 0.9 (211964d, 2023-02-07) project has a different take on st patching. It uses preprocessor directives to decide whether or not to include a patch during build time. Essentially this means that this build, for better or worse, contains both the patched _and_ the original code. The aim being that you can select which patches to include and the build will contain that code and nothing more.
For example to include the `alpha` patch then you would only need to flip this setting from 0 to 1 in [patches.h](https://github.com/bakkeby/st-flexipatch/blob/master/patches.def.h): For example to include the `alpha` patch then you would only need to flip this setting from 0 to 1 in [patches.h](https://github.com/bakkeby/st-flexipatch/blob/master/patches.def.h):
```c ```c

3
st.c
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@ -3176,6 +3176,9 @@ check_control_code:
* they must not cause conflicts with sequences. * they must not cause conflicts with sequences.
*/ */
if (control) { if (control) {
/* in UTF-8 mode ignore handling C1 control characters */
if (IS_SET(MODE_UTF8) && ISCONTROLC1(u))
return;
tcontrolcode(u); tcontrolcode(u);
/* /*
* control codes are not shown ever * control codes are not shown ever