emacs-29 9686b015a0d: Fix strike-through attribute support on TTY frames

[Eli Zaretskii]

branch: emacs-29
commit 9686b015a0d71d08828afb0cfe6e477bbc4909ae
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Fix strike-through attribute support on TTY frames
    
    * src/term.c (init_tty): Fix setting the strike-through capability
    with "smxx".  (Bug#62265)
---
 src/term.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/term.c b/src/term.c
index d881dee39fe..8a16ce4e33f 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4163,7 +4163,15 @@ use the Bourne shell command 'TERM=...; export TERM' 
(C-shell:\n\
   tty->TS_enter_alt_charset_mode = tgetstr ("as", address);
   tty->TS_exit_alt_charset_mode = tgetstr ("ae", address);
   tty->TS_exit_attribute_mode = tgetstr ("me", address);
+#ifdef TERMINFO
+  tty->TS_enter_strike_through_mode = tigetstr ("smxx", address);
+  if (tty->TS_enter_strike_through_mode == (char *) (intptr_t) -1)
+    tty->TS_enter_strike_through_mode = NULL;
+#else
+  /* FIXME: Is calling tgetstr here for non-terminfo case correct,
+     even though "smxx" is more than 2 characters?  */
   tty->TS_enter_strike_through_mode = tgetstr ("smxx", address);
+#endif
 
   MultiUp (tty) = tgetstr ("UP", address);
   MultiDown (tty) = tgetstr ("DO", address);