Daan De Meyer
9fc49a4ca7
Add TERMIOS_NULL sentinel, TermiosResetContext, and CLEANUP_TERMIOS_RESET() macro (modeled after CLEANUP_ARRAY()) to automatically restore terminal settings when leaving scope, replacing manual goto+tcsetattr patterns. Migrate ask_string_full(), terminal_get_cursor_position(), get_default_background_color(), terminal_get_terminfo_by_dcs(), terminal_get_size_by_dsr() and terminal_get_size_by_csi18() to use the new cleanup macro, removing the goto-based cleanup labels and replacing them with direct returns. Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
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