source: trunk/texinfo/info/terminal.h@ 2927

Last change on this file since 2927 was 2617, checked in by bird, 20 years ago

GNU Texinfo 4.8
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1/* terminal.h -- The external interface to terminal I/O.
2 $Id: terminal.h,v 1.3 2004/04/11 17:56:46 karl Exp $
3
4 Copyright (C) 1993, 1996, 1997, 2001, 2002, 2004 Free Software
5 Foundation, Inc.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20
21 Written by Brian Fox (bfox@ai.mit.edu). */
22
23#if !defined (TERMINAL_H)
24#define TERMINAL_H
25
26#include "info.h"
27
28/* For almost every function externally visible from terminal.c, there is
29 a corresponding "hook" function which can be bound in order to replace
30 the functionality of the one found in terminal.c. This is how we go
31 about implemented X window display. */
32
33/* The width and height of the terminal. */
34extern int screenwidth, screenheight;
35
36/* Non-zero means this terminal can't really do anything. */
37extern int terminal_is_dumb_p;
38
39/* Non-zero means that this terminal has a meta key. */
40extern int terminal_has_meta_p;
41
42/* Non-zero means that this terminal can produce a visible bell. */
43extern int terminal_has_visible_bell_p;
44
45/* Non-zero means to use that visible bell if at all possible. */
46extern int terminal_use_visible_bell_p;
47
48/* Non-zero means that this terminal can scroll lines up and down. */
49extern int terminal_can_scroll;
50
51/* Initialize the terminal which is known as TERMINAL_NAME. If this terminal
52 doesn't have cursor addressability, TERMINAL_IS_DUMB_P becomes non-zero.
53 The variables SCREENHEIGHT and SCREENWIDTH are set to the dimensions that
54 this terminal actually has. The variable TERMINAL_HAS_META_P becomes non-
55 zero if this terminal supports a Meta key. */
56extern void terminal_initialize_terminal (char *terminal_name);
57extern VFunction *terminal_initialize_terminal_hook;
58
59/* Return the current screen width and height in the variables
60 SCREENWIDTH and SCREENHEIGHT. */
61extern void terminal_get_screen_size (void);
62extern VFunction *terminal_get_screen_size_hook;
63
64/* Save and restore tty settings. */
65extern void terminal_prep_terminal (void);
66extern void terminal_unprep_terminal (void);
67
68extern VFunction *terminal_prep_terminal_hook;
69extern VFunction *terminal_unprep_terminal_hook;
70
71/* Re-initialize the terminal to TERMINAL_NAME. */
72extern void terminal_new_terminal (char *terminal_name);
73extern VFunction *terminal_new_terminal_hook;
74
75/* Move the cursor to the terminal location of X and Y. */
76extern void terminal_goto_xy (int x, int y);
77extern VFunction *terminal_goto_xy_hook;
78
79/* Print STRING to the terminal at the current position. */
80extern void terminal_put_text (char *string);
81extern VFunction *terminal_put_text_hook;
82
83/* Print NCHARS from STRING to the terminal at the current position. */
84extern void terminal_write_chars (char *string, int nchars);
85extern VFunction *terminal_write_chars_hook;
86
87/* Clear from the current position of the cursor to the end of the line. */
88extern void terminal_clear_to_eol (void);
89extern VFunction *terminal_clear_to_eol_hook;
90
91/* Clear the entire terminal screen. */
92extern void terminal_clear_screen (void);
93extern VFunction *terminal_clear_screen_hook;
94
95/* Move the cursor up one line. */
96extern void terminal_up_line (void);
97extern VFunction *terminal_up_line_hook;
98
99/* Move the cursor down one line. */
100extern void terminal_down_line (void);
101extern VFunction *terminal_down_line_hook;
102
103/* Turn on reverse video if possible. */
104extern void terminal_begin_inverse (void);
105extern VFunction *terminal_begin_inverse_hook;
106
107/* Turn off reverse video if possible. */
108extern void terminal_end_inverse (void);
109extern VFunction *terminal_end_inverse_hook;
110
111/* Scroll an area of the terminal, starting with the region from START
112 to END, AMOUNT lines. If AMOUNT is negative, the lines are scrolled
113 towards the top of the screen, else they are scrolled towards the
114 bottom of the screen. */
115extern void terminal_scroll_terminal (int start, int end, int amount);
116extern VFunction *terminal_scroll_terminal_hook;
117
118/* Ring the terminal bell. The bell is run visibly if it both has one and
119 terminal_use_visible_bell_p is non-zero. */
120extern void terminal_ring_bell (void);
121extern VFunction *terminal_ring_bell_hook;
122
123/* The key sequences output by special keys, if this terminal has any. */
124extern char *term_ku, *term_kd, *term_kr, *term_kl;
125extern char *term_kP, *term_kN;
126extern char *term_ke, *term_kh;
127extern char *term_kx, *term_ki;
128extern char *term_kD;
129
130#endif /* !TERMINAL_H */
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