[hackers] [st] ignore C1 control characters in UTF-8 mode || Hiltjo Posthuma

[git]

commit 211964d56ee00a7d46e251cbc150afb79138ae37
Author:     Hiltjo Posthuma <hil...@codemadness.org>
AuthorDate: Tue Feb 7 20:00:59 2023 +0100
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Tue Feb 7 20:00:59 2023 +0100

    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

diff --git a/st.c b/st.c
index 49357cc..134e724 100644
--- a/st.c
+++ b/st.c
@@ -2422,6 +2422,9 @@ check_control_code:
         * they must not cause conflicts with sequences.
         */
        if (control) {
+               /* in UTF-8 mode ignore handling C1 control characters */
+               if (IS_SET(MODE_UTF8) && ISCONTROLC1(u))
+                       return;
                tcontrolcode(u);
                /*
                 * control codes are not shown ever