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GeezerVison is showing github.com — gh-161571: Fix a crash in curses.tparm() with string parameters by serhiy-storchaka · Pull Request #161601 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Nov 8, 2026

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curses takes as char * the parameters that the format string formats with %s or %l after %pN, for example in the Ms and Cs capabilities of xterm. curses.tparm() passed all parameters as integers, so an integer there crashed.

tparm() now finds these parameters in the format string, as ncurses does, and requires bytes objects for them, which it passes as char *. An integer there raises TypeError. The other parameters are integers, as before. An omitted parameter is still 0, which curses takes as an empty string for a string parameter.

The parameters are now a var-positional parameter, tparm(str, /, *params), with at most nine of them.

  • Issue: curses.tparm() crashes for capabilities that take string parameters #161571

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@serhiy-storchaka @claude
pythongh-161571: Fix a crash in curses.tparm() with string parameters
c4e0f95 
curses passes the parameters that the format string formats with %s or
%l after %p as char *, for example in the Ms capability of xterm.  An
integer there crashed it.  Such parameters must now be bytes objects,
which are passed as char *.  The parameters are now a var-positional
parameter.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
@bedevere-app bedevere-app Bot added the awaiting core review label Nov 8, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Nov 8, 2026
curses.tparm() crashes for capabilities that take string parameters #161571
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@serhiy-storchaka
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