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+/* terminal.c -- how to handle the physical terminal for Info.
+ $Id: terminal.c,v 1.7 2008/06/11 09:55:43 gray Exp $
+
+ Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1996, 1997, 1998,
+ 1999, 2001, 2002, 2004, 2007, 2008 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
+
+ Originally written by Brian Fox (bfox@ai.mit.edu). */
+
+#include "info.h"
+#include "terminal.h"
+#include "termdep.h"
+
+#include <sys/types.h>
+#include <signal.h>
+
+/* The Unix termcap interface code. */
+#ifdef HAVE_NCURSES_TERMCAP_H
+#include <ncurses/termcap.h>
+#else
+#ifdef HAVE_TERMCAP_H
+#include <termcap.h>
+#else
+/* On Solaris2, sys/types.h #includes sys/reg.h, which #defines PC.
+ Unfortunately, PC is a global variable used by the termcap library. */
+#undef PC
+
+/* Termcap requires these variables, whether we access them or not. */
+char *BC, *UP;
+char PC; /* Pad character */
+short ospeed; /* Terminal output baud rate */
+extern int tgetnum (), tgetflag (), tgetent ();
+extern char *tgetstr (), *tgoto ();
+extern void tputs ();
+#endif /* not HAVE_TERMCAP_H */
+#endif /* not HAVE_NCURSES_TERMCAP_H */
+
+/* Function "hooks". If you make one of these point to a function, that
+ function is called when appropriate instead of its namesake. Your
+ function is called with exactly the same arguments that were passed
+ to the namesake function. */
+VFunction *terminal_begin_inverse_hook = NULL;
+VFunction *terminal_end_inverse_hook = NULL;
+VFunction *terminal_prep_terminal_hook = NULL;
+VFunction *terminal_unprep_terminal_hook = NULL;
+VFunction *terminal_up_line_hook = NULL;
+VFunction *terminal_down_line_hook = NULL;
+VFunction *terminal_clear_screen_hook = NULL;
+VFunction *terminal_clear_to_eol_hook = NULL;
+VFunction *terminal_get_screen_size_hook = NULL;
+VFunction *terminal_goto_xy_hook = NULL;
+VFunction *terminal_initialize_terminal_hook = NULL;
+VFunction *terminal_new_terminal_hook = NULL;
+VFunction *terminal_put_text_hook = NULL;
+VFunction *terminal_ring_bell_hook = NULL;
+VFunction *terminal_write_chars_hook = NULL;
+VFunction *terminal_scroll_terminal_hook = NULL;
+
+/* **************************************************************** */
+/* */
+/* Terminal and Termcap */
+/* */
+/* **************************************************************** */
+
+/* A buffer which holds onto the current terminal description, and a pointer
+ used to float within it. And the name of the terminal. */
+static char *term_buffer = NULL;
+static char *term_string_buffer = NULL;
+static char *term_name;
+
+/* Some strings to control terminal actions. These are output by tputs (). */
+static char *term_goto, *term_clreol, *term_cr, *term_clrpag;
+static char *term_begin_use, *term_end_use;
+static char *term_AL, *term_DL, *term_al, *term_dl;
+
+static char *term_keypad_on, *term_keypad_off;
+
+/* How to go up a line. */
+static char *term_up;
+
+/* How to go down a line. */
+static char *term_dn;
+
+/* An audible bell, if the terminal can be made to make noise. */
+static char *audible_bell;
+
+/* A visible bell, if the terminal can be made to flash the screen. */
+static char *visible_bell;
+
+/* The string to write to turn on the meta key, if this term has one. */
+static char *term_mm;
+
+/* The string to turn on inverse mode, if this term has one. */
+static char *term_invbeg;
+
+/* The string to turn off inverse mode, if this term has one. */
+static char *term_invend;
+
+/* Although I can't find any documentation that says this is supposed to
+ return its argument, all the code I've looked at (termutils, less)
+ does so, so fine. */
+static int
+output_character_function (int c)
+{
+ putc (c, stdout);
+ return c;
+}
+
+/* Macro to send STRING to the terminal. */
+#define send_to_terminal(string) \
+ do { \
+ if (string) \
+ tputs (string, 1, output_character_function); \
+ } while (0)
+
+/* Tell the terminal that we will be doing cursor addressable motion. */
+static void
+terminal_begin_using_terminal (void)
+{
+ RETSIGTYPE (*sigsave) (int signum);
+
+ if (term_keypad_on)
+ send_to_terminal (term_keypad_on);
+
+ if (!term_begin_use || !*term_begin_use)
+ return;
+
+#ifdef SIGWINCH
+ sigsave = signal (SIGWINCH, SIG_IGN);
+#endif
+
+ send_to_terminal (term_begin_use);
+ fflush (stdout);
+ if (STREQ (term_name, "sun-cmd"))
+ /* Without this fflush and sleep, running info in a shelltool or
+ cmdtool (TERM=sun-cmd) with scrollbars loses -- the scrollbars are
+ not restored properly.
+ From: strube@physik3.gwdg.de (Hans Werner Strube). */
+ sleep (1);
+
+#ifdef SIGWINCH
+ signal (SIGWINCH, sigsave);
+#endif
+}
+
+/* Tell the terminal that we will not be doing any more cursor
+ addressable motion. */
+static void
+terminal_end_using_terminal (void)
+{
+ RETSIGTYPE (*sigsave) (int signum);
+
+ if (term_keypad_off)
+ send_to_terminal (term_keypad_off);
+
+ if (!term_end_use || !*term_end_use)
+ return;
+
+#ifdef SIGWINCH
+ sigsave = signal (SIGWINCH, SIG_IGN);
+#endif
+
+ send_to_terminal (term_end_use);
+ fflush (stdout);
+ if (STREQ (term_name, "sun-cmd"))
+ /* See comments at other sleep. */
+ sleep (1);
+
+#ifdef SIGWINCH
+ signal (SIGWINCH, sigsave);
+#endif
+}
+
+/* **************************************************************** */
+/* */
+/* Necessary Terminal Functions */
+/* */
+/* **************************************************************** */
+
+/* The functions and variables on this page implement the user visible
+ portion of the terminal interface. */
+
+/* The width and height of the terminal. */
+int screenwidth, screenheight;
+
+/* Non-zero means this terminal can't really do anything. */
+int terminal_is_dumb_p = 0;
+
+/* Non-zero means that this terminal has a meta key. */
+int terminal_has_meta_p = 0;
+
+/* Non-zero means that this terminal can produce a visible bell. */
+int terminal_has_visible_bell_p = 0;
+
+/* Non-zero means to use that visible bell if at all possible. */
+int terminal_use_visible_bell_p = 0;
+
+/* Non-zero means that the terminal can do scrolling. */
+int terminal_can_scroll = 0;
+
+/* The key sequences output by the arrow keys, if this terminal has any. */
+char *term_ku = NULL;
+char *term_kd = NULL;
+char *term_kr = NULL;
+char *term_kl = NULL;
+char *term_kP = NULL; /* page-up */
+char *term_kN = NULL; /* page-down */
+char *term_kh = NULL; /* home */
+char *term_ke = NULL; /* end */
+char *term_kD = NULL; /* delete */
+char *term_ki = NULL; /* ins */
+char *term_kx = NULL; /* del */
+
+/* Move the cursor to the terminal location of X and Y. */
+void
+terminal_goto_xy (int x, int y)
+{
+ if (terminal_goto_xy_hook)
+ (*terminal_goto_xy_hook) (x, y);
+ else
+ {
+ if (term_goto)
+ tputs (tgoto (term_goto, x, y), 1, output_character_function);
+ }
+}
+
+/* Print STRING to the terminal at the current position. */
+void
+terminal_put_text (char *string)
+{
+ if (terminal_put_text_hook)
+ (*terminal_put_text_hook) (string);
+ else
+ {
+ printf ("%s", string);
+ }
+}
+
+/* Print NCHARS from STRING to the terminal at the current position. */
+void
+terminal_write_chars (char *string, int nchars)
+{
+ if (terminal_write_chars_hook)
+ (*terminal_write_chars_hook) (string, nchars);
+ else
+ {
+ if (nchars)
+ fwrite (string, 1, nchars, stdout);
+ }
+}
+
+/* Clear from the current position of the cursor to the end of the line. */
+void
+terminal_clear_to_eol (void)
+{
+ if (terminal_clear_to_eol_hook)
+ (*terminal_clear_to_eol_hook) ();
+ else
+ {
+ send_to_terminal (term_clreol);
+ }
+}
+
+/* Clear the entire terminal screen. */
+void
+terminal_clear_screen (void)
+{
+ if (terminal_clear_screen_hook)
+ (*terminal_clear_screen_hook) ();
+ else
+ {
+ send_to_terminal (term_clrpag);
+ }
+}
+
+/* Move the cursor up one line. */
+void
+terminal_up_line (void)
+{
+ if (terminal_up_line_hook)
+ (*terminal_up_line_hook) ();
+ else
+ {
+ send_to_terminal (term_up);
+ }
+}
+
+/* Move the cursor down one line. */
+void
+terminal_down_line (void)
+{
+ if (terminal_down_line_hook)
+ (*terminal_down_line_hook) ();
+ else
+ {
+ send_to_terminal (term_dn);
+ }
+}
+
+/* Turn on reverse video if possible. */
+void
+terminal_begin_inverse (void)
+{
+ if (terminal_begin_inverse_hook)
+ (*terminal_begin_inverse_hook) ();
+ else
+ {
+ send_to_terminal (term_invbeg);
+ }
+}
+
+/* Turn off reverse video if possible. */
+void
+terminal_end_inverse (void)
+{
+ if (terminal_end_inverse_hook)
+ (*terminal_end_inverse_hook) ();
+ else
+ {
+ send_to_terminal (term_invend);
+ }
+}
+
+/* Ring the terminal bell. The bell is run visibly if it both has one and
+ terminal_use_visible_bell_p is non-zero. */
+void
+terminal_ring_bell (void)
+{
+ if (terminal_ring_bell_hook)
+ (*terminal_ring_bell_hook) ();
+ else
+ {
+ if (terminal_has_visible_bell_p && terminal_use_visible_bell_p)
+ send_to_terminal (visible_bell);
+ else
+ send_to_terminal (audible_bell);
+ }
+}
+
+/* At the line START, delete COUNT lines from the terminal display. */
+static void
+terminal_delete_lines (int start, int count)
+{
+ int lines;
+
+ /* Normalize arguments. */
+ if (start < 0)
+ start = 0;
+
+ lines = screenheight - start;
+ terminal_goto_xy (0, start);
+ if (term_DL)
+ tputs (tgoto (term_DL, 0, count), lines, output_character_function);
+ else
+ {
+ while (count--)
+ tputs (term_dl, lines, output_character_function);
+ }
+
+ fflush (stdout);
+}
+
+/* At the line START, insert COUNT lines in the terminal display. */
+static void
+terminal_insert_lines (int start, int count)
+{
+ int lines;
+
+ /* Normalize arguments. */
+ if (start < 0)
+ start = 0;
+
+ lines = screenheight - start;
+ terminal_goto_xy (0, start);
+
+ if (term_AL)
+ tputs (tgoto (term_AL, 0, count), lines, output_character_function);
+ else
+ {
+ while (count--)
+ tputs (term_al, lines, output_character_function);
+ }
+
+ fflush (stdout);
+}
+
+/* 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. */
+void
+terminal_scroll_terminal (int start, int end, int amount)
+{
+ if (!terminal_can_scroll)
+ return;
+
+ /* Any scrolling at all? */
+ if (amount == 0)
+ return;
+
+ if (terminal_scroll_terminal_hook)
+ (*terminal_scroll_terminal_hook) (start, end, amount);
+ else
+ {
+ /* If we are scrolling down, delete AMOUNT lines at END. Then insert
+ AMOUNT lines at START. */
+ if (amount > 0)
+ {
+ terminal_delete_lines (end, amount);
+ terminal_insert_lines (start, amount);
+ }
+
+ /* If we are scrolling up, delete AMOUNT lines before START. This
+ actually does the upwards scroll. Then, insert AMOUNT lines
+ after the already scrolled region (i.e., END - AMOUNT). */
+ if (amount < 0)
+ {
+ int abs_amount = -amount;
+ terminal_delete_lines (start - abs_amount, abs_amount);
+ terminal_insert_lines (end - abs_amount, abs_amount);
+ }
+ }
+}
+
+/* Re-initialize the terminal considering that the TERM/TERMCAP variable
+ has changed. */
+void
+terminal_new_terminal (char *terminal_name)
+{
+ if (terminal_new_terminal_hook)
+ (*terminal_new_terminal_hook) (terminal_name);
+ else
+ {
+ terminal_initialize_terminal (terminal_name);
+ }
+}
+
+/* Set the global variables SCREENWIDTH and SCREENHEIGHT. */
+void
+terminal_get_screen_size (void)
+{
+ if (terminal_get_screen_size_hook)
+ (*terminal_get_screen_size_hook) ();
+ else
+ {
+ screenwidth = screenheight = 0;
+
+#if defined (TIOCGWINSZ)
+ {
+ struct winsize window_size;
+
+ if (ioctl (fileno (stdout), TIOCGWINSZ, &window_size) == 0)
+ {
+ screenwidth = (int) window_size.ws_col;
+ screenheight = (int) window_size.ws_row;
+ }
+ }
+#endif /* TIOCGWINSZ */
+
+ /* Environment variable COLUMNS overrides setting of "co". */
+ if (screenwidth <= 0)
+ {
+ char *sw = getenv ("COLUMNS");
+
+ if (sw)
+ screenwidth = atoi (sw);
+
+ if (screenwidth <= 0)
+ screenwidth = tgetnum ("co");
+ }
+
+ /* Environment variable LINES overrides setting of "li". */
+ if (screenheight <= 0)
+ {
+ char *sh = getenv ("LINES");
+
+ if (sh)
+ screenheight = atoi (sh);
+
+ if (screenheight <= 0)
+ screenheight = tgetnum ("li");
+ }
+
+ /* If all else fails, default to 80x24 terminal. */
+ if (screenwidth <= 0)
+ screenwidth = 80;
+
+ if (screenheight <= 0)
+ screenheight = 24;
+ }
+}
+
+/* Initialize the terminal which is known as TERMINAL_NAME. If this
+ terminal doesn't have cursor addressability, `terminal_is_dumb_p'
+ becomes nonzero. The variables SCREENHEIGHT and SCREENWIDTH are set
+ to the dimensions that this terminal actually has. The variable
+ TERMINAL_HAS_META_P becomes nonzero if this terminal supports a Meta
+ key. Finally, the terminal screen is cleared. */
+void
+terminal_initialize_terminal (char *terminal_name)
+{
+ char *buffer;
+
+ terminal_is_dumb_p = 0;
+
+ if (terminal_initialize_terminal_hook)
+ {
+ (*terminal_initialize_terminal_hook) (terminal_name);
+ return;
+ }
+
+ term_name = terminal_name ? terminal_name : getenv ("TERM");
+ if (!term_name)
+ term_name = "dumb";
+
+ if (!term_string_buffer)
+ term_string_buffer = xmalloc (2048);
+
+ if (!term_buffer)
+ term_buffer = xmalloc (2048);
+
+ buffer = term_string_buffer;
+
+ term_clrpag = term_cr = term_clreol = NULL;
+
+ /* HP-UX 11.x returns 0 for OK --jeff.hull@state.co.us. */
+ if (tgetent (term_buffer, term_name) < 0)
+ {
+ terminal_is_dumb_p = 1;
+ screenwidth = 80;
+ screenheight = 24;
+ term_cr = "\r";
+ term_up = term_dn = audible_bell = visible_bell = NULL;
+ term_ku = term_kd = term_kl = term_kr = NULL;
+ term_kP = term_kN = NULL;
+ term_kh = term_ke = NULL;
+ term_kD = NULL;
+ return;
+ }
+
+ BC = tgetstr ("pc", &buffer);
+ PC = BC ? *BC : 0;
+
+#if defined (HAVE_TERMIOS_H)
+ {
+ struct termios ti;
+ if (tcgetattr (fileno(stdout), &ti) != -1)
+ ospeed = cfgetospeed (&ti);
+ else
+ ospeed = B9600;
+ }
+#else
+# if defined (TIOCGETP)
+ {
+ struct sgttyb sg;
+
+ if (ioctl (fileno (stdout), TIOCGETP, &sg) != -1)
+ ospeed = sg.sg_ospeed;
+ else
+ ospeed = B9600;
+ }
+# else
+ ospeed = B9600;
+# endif /* !TIOCGETP */
+#endif
+
+ term_cr = tgetstr ("cr", &buffer);
+ term_clreol = tgetstr ("ce", &buffer);
+ term_clrpag = tgetstr ("cl", &buffer);
+ term_goto = tgetstr ("cm", &buffer);
+
+ /* Find out about this terminal's scrolling capability. */
+ term_AL = tgetstr ("AL", &buffer);
+ term_DL = tgetstr ("DL", &buffer);
+ term_al = tgetstr ("al", &buffer);
+ term_dl = tgetstr ("dl", &buffer);
+
+ terminal_can_scroll = ((term_AL || term_al) && (term_DL || term_dl));
+
+ term_invbeg = tgetstr ("mr", &buffer);
+ if (term_invbeg)
+ term_invend = tgetstr ("me", &buffer);
+ else
+ term_invend = NULL;
+
+ if (!term_cr)
+ term_cr = "\r";
+
+ terminal_get_screen_size ();
+
+ term_up = tgetstr ("up", &buffer);
+ term_dn = tgetstr ("dn", &buffer);
+ visible_bell = tgetstr ("vb", &buffer);
+ terminal_has_visible_bell_p = (visible_bell != NULL);
+ audible_bell = tgetstr ("bl", &buffer);
+ if (!audible_bell)
+ audible_bell = "\007";
+ term_begin_use = tgetstr ("ti", &buffer);
+ term_end_use = tgetstr ("te", &buffer);
+
+ term_keypad_on = tgetstr ("ks", &buffer);
+ term_keypad_off = tgetstr ("ke", &buffer);
+
+ /* Check to see if this terminal has a meta key. */
+ terminal_has_meta_p = (tgetflag ("km") || tgetflag ("MT"));
+ if (terminal_has_meta_p)
+ {
+ term_mm = tgetstr ("mm", &buffer);
+ }
+ else
+ {
+ term_mm = NULL;
+ }
+
+ /* Attempt to find the arrow keys. */
+ term_ku = tgetstr ("ku", &buffer);
+ term_kd = tgetstr ("kd", &buffer);
+ term_kr = tgetstr ("kr", &buffer);
+ term_kl = tgetstr ("kl", &buffer);
+
+ term_kP = tgetstr ("kP", &buffer);
+ term_kN = tgetstr ("kN", &buffer);
+
+#if defined(INFOKEY)
+ term_kh = tgetstr ("kh", &buffer);
+ term_ke = tgetstr ("@7", &buffer);
+ term_ki = tgetstr ("kI", &buffer);
+ term_kx = tgetstr ("kD", &buffer);
+#endif /* defined(INFOKEY) */
+
+ /* Home and end keys. */
+ term_kh = tgetstr ("kh", &buffer);
+ term_ke = tgetstr ("@7", &buffer);
+
+ term_kD = tgetstr ("kD", &buffer);
+
+ /* If this terminal is not cursor addressable, then it is really dumb. */
+ if (!term_goto)
+ terminal_is_dumb_p = 1;
+}
+
+/* How to read characters from the terminal. */
+
+#if defined (HAVE_TERMIOS_H)
+struct termios original_termios, ttybuff;
+#else
+# if defined (HAVE_TERMIO_H)
+/* A buffer containing the terminal mode flags upon entry to info. */
+struct termio original_termio, ttybuff;
+# else /* !HAVE_TERMIO_H */
+/* Buffers containing the terminal mode flags upon entry to info. */
+int original_tty_flags = 0;
+int original_lmode;
+struct sgttyb ttybuff;
+
+# if defined(TIOCGETC) && defined(M_XENIX)
+/* SCO 3.2v5.0.2 defines but does not support TIOCGETC. Gak. Maybe
+ better fix would be to use Posix termios in preference. --gildea,
+ 1jul99. */
+# undef TIOCGETC
+# endif
+
+# if defined (TIOCGETC)
+/* A buffer containing the terminal interrupt characters upon entry
+ to Info. */
+struct tchars original_tchars;
+# endif
+
+# if defined (TIOCGLTC)
+/* A buffer containing the local terminal mode characters upon entry
+ to Info. */
+struct ltchars original_ltchars;
+# endif
+# endif /* !HAVE_TERMIO_H */
+#endif /* !HAVE_TERMIOS_H */
+
+/* Prepare to start using the terminal to read characters singly. */
+void
+terminal_prep_terminal (void)
+{
+ int tty;
+
+ if (terminal_prep_terminal_hook)
+ {
+ (*terminal_prep_terminal_hook) ();
+ return;
+ }
+
+ terminal_begin_using_terminal ();
+
+ tty = fileno (stdin);
+
+#if defined (HAVE_TERMIOS_H)
+ tcgetattr (tty, &original_termios);
+ tcgetattr (tty, &ttybuff);
+#else
+# if defined (HAVE_TERMIO_H)
+ ioctl (tty, TCGETA, &original_termio);
+ ioctl (tty, TCGETA, &ttybuff);
+# endif
+#endif
+
+#if defined (HAVE_TERMIOS_H) || defined (HAVE_TERMIO_H)
+ ttybuff.c_iflag &= (~ISTRIP & ~INLCR & ~IGNCR & ~ICRNL & ~IXON);
+/* These output flags are not part of POSIX, so only use them if they
+ are defined. */
+#ifdef ONLCR
+ ttybuff.c_oflag &= ~ONLCR ;
+#endif
+#ifdef OCRNL
+ ttybuff.c_oflag &= ~OCRNL;
+#endif
+ ttybuff.c_lflag &= (~ICANON & ~ECHO);
+
+ ttybuff.c_cc[VMIN] = 1;
+ ttybuff.c_cc[VTIME] = 0;
+
+ if (ttybuff.c_cc[VINTR] == '\177')
+ ttybuff.c_cc[VINTR] = -1;
+
+ if (ttybuff.c_cc[VQUIT] == '\177')
+ ttybuff.c_cc[VQUIT] = -1;
+
+#ifdef VLNEXT
+ if (ttybuff.c_cc[VLNEXT] == '\026')
+ ttybuff.c_cc[VLNEXT] = -1;
+#endif /* VLNEXT */
+#endif /* TERMIOS or TERMIO */
+
+/* cf. emacs/src/sysdep.c for being sure output is on. */
+#if defined (HAVE_TERMIOS_H)
+ /* linux kernel 2.2.x needs a TCOFF followed by a TCOON to turn output
+ back on if the user presses ^S at the very beginning; just a TCOON
+ doesn't work. --Kevin Ryde <user42@zip.com.au>, 16jun2000. */
+ tcsetattr (tty, TCSANOW, &ttybuff);
+# ifdef TCOON
+ tcflow (tty, TCOOFF);
+ tcflow (tty, TCOON);
+# endif
+#else
+# if defined (HAVE_TERMIO_H)
+ ioctl (tty, TCSETA, &ttybuff);
+# ifdef TCXONC
+ ioctl (tty, TCXONC, 1);
+# endif
+# endif
+#endif
+
+#if !defined (HAVE_TERMIOS_H) && !defined (HAVE_TERMIO_H)
+ ioctl (tty, TIOCGETP, &ttybuff);
+
+ if (!original_tty_flags)
+ original_tty_flags = ttybuff.sg_flags;
+
+ /* Make this terminal pass 8 bits around while we are using it. */
+# if defined (PASS8)
+ ttybuff.sg_flags |= PASS8;
+# endif /* PASS8 */
+
+# if defined (TIOCLGET) && defined (LPASS8)
+ {
+ int flags;
+ ioctl (tty, TIOCLGET, &flags);
+ original_lmode = flags;
+ flags |= LPASS8;
+ ioctl (tty, TIOCLSET, &flags);
+ }
+# endif /* TIOCLGET && LPASS8 */
+
+# if defined (TIOCGETC)
+ {
+ struct tchars temp;
+
+ ioctl (tty, TIOCGETC, &original_tchars);
+ temp = original_tchars;
+
+ /* C-s and C-q. */
+ temp.t_startc = temp.t_stopc = -1;
+
+ /* Often set to C-d. */
+ temp.t_eofc = -1;
+
+ /* If the a quit or interrupt character conflicts with one of our
+ commands, then make it go away. */
+ if (temp.t_intrc == '\177')
+ temp.t_intrc = -1;
+
+ if (temp.t_quitc == '\177')
+ temp.t_quitc = -1;
+
+ ioctl (tty, TIOCSETC, &temp);
+ }
+# endif /* TIOCGETC */
+
+# if defined (TIOCGLTC)
+ {
+ struct ltchars temp;
+
+ ioctl (tty, TIOCGLTC, &original_ltchars);
+ temp = original_ltchars;
+
+ /* Make the interrupt keys go away. Just enough to make people happy. */
+ temp.t_lnextc = -1; /* C-v. */
+ temp.t_dsuspc = -1; /* C-y. */
+ temp.t_flushc = -1; /* C-o. */
+ ioctl (tty, TIOCSLTC, &temp);
+ }
+# endif /* TIOCGLTC */
+
+ ttybuff.sg_flags &= ~ECHO;
+ ttybuff.sg_flags |= CBREAK;
+ ioctl (tty, TIOCSETN, &ttybuff);
+#endif /* !HAVE_TERMIOS_H && !HAVE_TERMIO_H */
+}
+
+/* Restore the tty settings back to what they were before we started using
+ this terminal. */
+void
+terminal_unprep_terminal (void)
+{
+ int tty;
+
+ if (terminal_unprep_terminal_hook)
+ {
+ (*terminal_unprep_terminal_hook) ();
+ return;
+ }
+
+ tty = fileno (stdin);
+
+#if defined (HAVE_TERMIOS_H)
+ tcsetattr (tty, TCSANOW, &original_termios);
+#else
+# if defined (HAVE_TERMIO_H)
+ ioctl (tty, TCSETA, &original_termio);
+# else /* !HAVE_TERMIO_H */
+ ioctl (tty, TIOCGETP, &ttybuff);
+ ttybuff.sg_flags = original_tty_flags;
+ ioctl (tty, TIOCSETN, &ttybuff);
+
+# if defined (TIOCGETC)
+ ioctl (tty, TIOCSETC, &original_tchars);
+# endif /* TIOCGETC */
+
+# if defined (TIOCGLTC)
+ ioctl (tty, TIOCSLTC, &original_ltchars);
+# endif /* TIOCGLTC */
+
+# if defined (TIOCLGET) && defined (LPASS8)
+ ioctl (tty, TIOCLSET, &original_lmode);
+# endif /* TIOCLGET && LPASS8 */
+
+# endif /* !HAVE_TERMIO_H */
+#endif /* !HAVE_TERMIOS_H */
+ terminal_end_using_terminal ();
+}
+
+#ifdef __MSDOS__
+# include "pcterm.c"
+#endif