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- /* terminal.h -- The external interface to terminal I/O. */
-
- /* This file is part of GNU Info, a program for reading online documentation
- stored in Info format.
-
- Copyright (C) 1993 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Written by Brian Fox (bfox@ai.mit.edu). */
-
- #if !defined (_TERMINAL_H_)
- #define _TERMINAL_H_
-
- /* We use the following data type to talk about pointers to functions. */
- #if !defined (__FUNCTION_DEF)
- # define __FUNCTION_DEF
- typedef int Function ();
- typedef void VFunction ();
- #endif /* _FUNCTION_DEF */
-
- /* For almost every function externally visible from terminal.c, there is
- a corresponding "hook" function which can be bound in order to replace
- the functionality of the one found in terminal.c. This is how we go
- about implemented X window display. */
-
- /* The width and height of the terminal. */
- extern int screenwidth, screenheight;
-
- /* Non-zero means this terminal can't really do anything. */
- extern int terminal_is_dumb_p;
-
- /* Non-zero means that this terminal has a meta key. */
- extern int terminal_has_meta_p;
-
- /* Non-zero means that this terminal can produce a visible bell. */
- extern int terminal_has_visible_bell_p;
-
- /* Non-zero means to use that visible bell if at all possible. */
- extern int terminal_use_visible_bell_p;
-
- /* Non-zero means that this terminal can scroll lines up and down. */
- extern int terminal_can_scroll;
-
- /* Initialize the terminal which is known as TERMINAL_NAME. If this terminal
- doesn't have cursor addressability, TERMINAL_IS_DUMB_P becomes non-zero.
- The variables SCREENHEIGHT and SCREENWIDTH are set to the dimensions that
- this terminal actually has. The variable TERMINAL_HAS_META_P becomes non-
- zero if this terminal supports a Meta key. */
- extern void terminal_initialize_terminal ();
- extern VFunction *terminal_initialize_terminal_hook;
-
- /* Return the current screen width and height in the variables
- SCREENWIDTH and SCREENHEIGHT. */
- extern void terminal_get_screen_size ();
- extern VFunction *terminal_get_screen_size_hook;
-
- /* Save and restore tty settings. */
- extern void terminal_prep_terminal (), terminal_unprep_terminal ();
- extern VFunction *terminal_prep_terminal_hook, *terminal_unprep_terminal_hook;
-
- /* Re-initialize the terminal to TERMINAL_NAME. */
- extern void terminal_new_terminal ();
- extern VFunction *terminal_new_terminal_hook;
-
- /* Move the cursor to the terminal location of X and Y. */
- extern void terminal_goto_xy ();
- extern VFunction *terminal_goto_xy_hook;
-
- /* Print STRING to the terminal at the current position. */
- extern void terminal_put_text ();
- extern VFunction *terminal_put_text_hook;
-
- /* Print NCHARS from STRING to the terminal at the current position. */
- extern void terminal_write_chars ();
- extern VFunction *terminal_write_chars_hook;
-
- /* Clear from the current position of the cursor to the end of the line. */
- extern void terminal_clear_to_eol ();
- extern VFunction *terminal_clear_to_eol_hook;
-
- /* Clear the entire terminal screen. */
- extern void terminal_clear_screen ();
- extern VFunction *terminal_clear_screen_hook;
-
- /* Move the cursor up one line. */
- extern void terminal_up_line ();
- extern VFunction *terminal_up_line_hook;
-
- /* Move the cursor down one line. */
- extern void terminal_down_line ();
- extern VFunction *terminal_down_line_hook;
-
- /* Turn on reverse video if possible. */
- extern void terminal_begin_inverse ();
- extern VFunction *terminal_begin_inverse_hook;
-
- /* Turn off reverse video if possible. */
- extern void terminal_end_inverse ();
- extern VFunction *terminal_end_inverse_hook;
-
- /* Scroll an area of the terminal, starting with the region from START
- to END, AMOUNT lines. If AMOUNT is negative, the lines are scrolled
- towards the top of the screen, else they are scrolled towards the
- bottom of the screen. */
- extern void terminal_scroll_terminal ();
- extern VFunction *terminal_scroll_terminal_hook;
-
- /* Ring the terminal bell. The bell is run visibly if it both has one and
- terminal_use_visible_bell_p is non-zero. */
- extern void terminal_ring_bell ();
- extern VFunction *terminal_ring_bell_hook;
-
- #endif /* !_TERMINAL_H_ */
-