contrib/texinfo-4/info/terminal.h

   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. */
  34 extern int screenwidth, screenheight;
  35
  36 /* Non-zero means this terminal can't really do anything. */
  37 extern int terminal_is_dumb_p;
  38
  39 /* Non-zero means that this terminal has a meta key. */
  40 extern int terminal_has_meta_p;
  41
  42 /* Non-zero means that this terminal can produce a visible bell. */
  43 extern int terminal_has_visible_bell_p;
  44
  45 /* Non-zero means to use that visible bell if at all possible. */
  46 extern int terminal_use_visible_bell_p;
  47
  48 /* Non-zero means that this terminal can scroll lines up and down. */
  49 extern 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. */
  56 extern void terminal_initialize_terminal (char *terminal_name);
  57 extern VFunction *terminal_initialize_terminal_hook;
  58
  59 /* Return the current screen width and height in the variables
  60    SCREENWIDTH and SCREENHEIGHT. */
  61 extern void terminal_get_screen_size (void);
  62 extern VFunction *terminal_get_screen_size_hook;
  63
  64 /* Save and restore tty settings. */
  65 extern void terminal_prep_terminal (void);
  66 extern void terminal_unprep_terminal (void);
  67
  68 extern VFunction *terminal_prep_terminal_hook;
  69 extern VFunction *terminal_unprep_terminal_hook;
  70
  71 /* Re-initialize the terminal to TERMINAL_NAME. */
  72 extern void terminal_new_terminal (char *terminal_name);
  73 extern VFunction *terminal_new_terminal_hook;
  74
  75 /* Move the cursor to the terminal location of X and Y. */
  76 extern void terminal_goto_xy (int x, int y);
  77 extern VFunction *terminal_goto_xy_hook;
  78
  79 /* Print STRING to the terminal at the current position. */
  80 extern void terminal_put_text (char *string);
  81 extern VFunction *terminal_put_text_hook;
  82
  83 /* Print NCHARS from STRING to the terminal at the current position. */
  84 extern void terminal_write_chars (char *string, int nchars);
  85 extern VFunction *terminal_write_chars_hook;
  86
  87 /* Clear from the current position of the cursor to the end of the line. */
  88 extern void terminal_clear_to_eol (void);
  89 extern VFunction *terminal_clear_to_eol_hook;
  90
  91 /* Clear the entire terminal screen. */
  92 extern void terminal_clear_screen (void);
  93 extern VFunction *terminal_clear_screen_hook;
  94
  95 /* Move the cursor up one line. */
  96 extern void terminal_up_line (void);
  97 extern VFunction *terminal_up_line_hook;
  98
  99 /* Move the cursor down one line. */
 100 extern void terminal_down_line (void);
 101 extern VFunction *terminal_down_line_hook;
 102
 103 /* Turn on reverse video if possible. */
 104 extern void terminal_begin_inverse (void);
 105 extern VFunction *terminal_begin_inverse_hook;
 106
 107 /* Turn off reverse video if possible. */
 108 extern void terminal_end_inverse (void);
 109 extern 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. */
 115 extern void terminal_scroll_terminal (int start, int end, int amount);
 116 extern 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. */
 120 extern void terminal_ring_bell (void);
 121 extern VFunction *terminal_ring_bell_hook;
 122
 123 /* The key sequences output by special keys, if this terminal has any. */
 124 extern char *term_ku, *term_kd, *term_kr, *term_kl;
 125 extern char *term_kP, *term_kN;
 126 extern char *term_ke, *term_kh;
 127 extern char *term_kx, *term_ki;
 128 extern char *term_kD;
 129
 130 #endif /* !TERMINAL_H */