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670 lines
16 KiB
C
670 lines
16 KiB
C
/* rltty.c -- functions to prepare and restore the terminal for readline's
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use. */
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/* Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 1, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "sysdep.h"
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#include <signal.h>
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#include <errno.h>
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#include <stdio.h>
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#ifndef NO_SYS_FILE
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#include <sys/file.h>
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#endif
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include "rldefs.h"
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#include "readline.h"
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#if !defined (errno)
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extern int errno;
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#endif /* !errno */
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extern int readline_echoing_p;
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extern int _rl_eof_char;
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#if defined (__GO32__)
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# include <sys/pc.h>
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# undef HANDLE_SIGNALS
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#endif /* __GO32__ */
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/* **************************************************************** */
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/* */
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/* Signal Management */
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/* */
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/* **************************************************************** */
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#if defined (HAVE_POSIX_SIGNALS)
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static sigset_t sigint_set, sigint_oset;
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#else /* !HAVE_POSIX_SIGNALS */
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# if defined (HAVE_BSD_SIGNALS)
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static int sigint_oldmask;
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# endif /* HAVE_BSD_SIGNALS */
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#endif /* !HAVE_POSIX_SIGNALS */
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static int sigint_blocked = 0;
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/* Cause SIGINT to not be delivered until the corresponding call to
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release_sigint(). */
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static void
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block_sigint ()
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{
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if (sigint_blocked)
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return;
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#if defined (HAVE_POSIX_SIGNALS)
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sigemptyset (&sigint_set);
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sigemptyset (&sigint_oset);
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sigaddset (&sigint_set, SIGINT);
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sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
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#else /* !HAVE_POSIX_SIGNALS */
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# if defined (HAVE_BSD_SIGNALS)
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sigint_oldmask = sigblock (sigmask (SIGINT));
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# else /* !HAVE_BSD_SIGNALS */
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# if defined (HAVE_USG_SIGHOLD)
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sighold (SIGINT);
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# endif /* HAVE_USG_SIGHOLD */
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# endif /* !HAVE_BSD_SIGNALS */
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#endif /* !HAVE_POSIX_SIGNALS */
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sigint_blocked = 1;
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}
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/* Allow SIGINT to be delivered. */
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static void
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release_sigint ()
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{
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if (!sigint_blocked)
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return;
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#if defined (HAVE_POSIX_SIGNALS)
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sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
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#else
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# if defined (HAVE_BSD_SIGNALS)
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sigsetmask (sigint_oldmask);
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# else /* !HAVE_BSD_SIGNALS */
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# if defined (HAVE_USG_SIGHOLD)
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sigrelse (SIGINT);
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# endif /* HAVE_USG_SIGHOLD */
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# endif /* !HAVE_BSD_SIGNALS */
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#endif /* !HAVE_POSIX_SIGNALS */
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sigint_blocked = 0;
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}
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/* **************************************************************** */
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/* */
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/* Controlling the Meta Key */
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/* */
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/* **************************************************************** */
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extern int term_has_meta;
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extern char *term_mm;
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extern char *term_mo;
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static void
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outchar (c)
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int c;
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{
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putc (c, rl_outstream);
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}
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/* Turn on/off the meta key depending on ON. */
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static void
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control_meta_key (on)
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int on;
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{
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if (term_has_meta)
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{
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if (on && term_mm)
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tputs (term_mm, 1, outchar);
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else if (!on && term_mo)
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tputs (term_mo, 1, outchar);
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}
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}
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/* **************************************************************** */
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/* */
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/* Saving and Restoring the TTY */
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/* */
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/* **************************************************************** */
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/* Non-zero means that the terminal is in a prepped state. */
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static int terminal_prepped = 0;
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/* If non-zero, means that this process has called tcflow(fd, TCOOFF)
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and output is suspended. */
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#if defined (__ksr1__)
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static int ksrflow = 0;
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#endif
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#if defined (NEW_TTY_DRIVER)
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/* Values for the `flags' field of a struct bsdtty. This tells which
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elements of the struct bsdtty have been fetched from the system and
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are valid. */
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#define SGTTY_SET 0x01
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#define LFLAG_SET 0x02
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#define TCHARS_SET 0x04
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#define LTCHARS_SET 0x08
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struct bsdtty {
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struct sgttyb sgttyb; /* Basic BSD tty driver information. */
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int lflag; /* Local mode flags, like LPASS8. */
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#if defined (TIOCGETC)
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struct tchars tchars; /* Terminal special characters, including ^S and ^Q. */
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#endif
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#if defined (TIOCGLTC)
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struct ltchars ltchars; /* 4.2 BSD editing characters */
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#endif
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int flags; /* Bitmap saying which parts of the struct are valid. */
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};
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#define TIOTYPE struct bsdtty
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static TIOTYPE otio;
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static int
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get_tty_settings (tty, tiop)
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int tty;
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TIOTYPE *tiop;
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{
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tiop->flags = tiop->lflag = 0;
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ioctl (tty, TIOCGETP, &(tiop->sgttyb));
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tiop->flags |= SGTTY_SET;
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#if defined (TIOCLGET)
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ioctl (tty, TIOCLGET, &(tiop->lflag));
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tiop->flags |= LFLAG_SET;
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#endif
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#if defined (TIOCGETC)
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ioctl (tty, TIOCGETC, &(tiop->tchars));
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tiop->flags |= TCHARS_SET;
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#endif
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#if defined (TIOCGLTC)
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ioctl (tty, TIOCGLTC, &(tiop->ltchars));
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tiop->flags |= LTCHARS_SET;
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#endif
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return 0;
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}
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set_tty_settings (tty, tiop)
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int tty;
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TIOTYPE *tiop;
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{
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if (tiop->flags & SGTTY_SET)
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{
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ioctl (tty, TIOCSETN, &(tiop->sgttyb));
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tiop->flags &= ~SGTTY_SET;
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}
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#if defined (TIOCLSET)
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if (tiop->flags & LFLAG_SET)
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{
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ioctl (tty, TIOCLSET, &(tiop->lflag));
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tiop->flags &= ~LFLAG_SET;
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}
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#endif
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#if defined (TIOCSETC)
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if (tiop->flags & TCHARS_SET)
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{
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ioctl (tty, TIOCSETC, &(tiop->tchars));
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tiop->flags &= ~TCHARS_SET;
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}
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#endif
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#if defined (TIOCSLTC)
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if (tiop->flags & LTCHARS_SET)
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{
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ioctl (tty, TIOCSLTC, &(tiop->ltchars));
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tiop->flags &= ~LTCHARS_SET;
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}
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#endif
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return 0;
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}
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static void
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prepare_terminal_settings (meta_flag, otio, tiop)
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int meta_flag;
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TIOTYPE otio, *tiop;
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{
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#if !defined (__GO32__)
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readline_echoing_p = (otio.sgttyb.sg_flags & ECHO);
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/* Copy the original settings to the structure we're going to use for
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our settings. */
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tiop->sgttyb = otio.sgttyb;
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tiop->lflag = otio.lflag;
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#if defined (TIOCGETC)
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tiop->tchars = otio.tchars;
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#endif
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#if defined (TIOCGLTC)
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tiop->ltchars = otio.ltchars;
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#endif
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tiop->flags = otio.flags;
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/* First, the basic settings to put us into character-at-a-time, no-echo
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input mode. */
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tiop->sgttyb.sg_flags &= ~(ECHO | CRMOD);
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tiop->sgttyb.sg_flags |= CBREAK;
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/* If this terminal doesn't care how the 8th bit is used, then we can
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use it for the meta-key. If only one of even or odd parity is
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specified, then the terminal is using parity, and we cannot. */
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#if !defined (ANYP)
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# define ANYP (EVENP | ODDP)
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#endif
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if (((otio.sgttyb.sg_flags & ANYP) == ANYP) ||
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((otio.sgttyb.sg_flags & ANYP) == 0))
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{
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tiop->sgttyb.sg_flags |= ANYP;
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/* Hack on local mode flags if we can. */
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#if defined (TIOCLGET)
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# if defined (LPASS8)
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tiop->lflag |= LPASS8;
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# endif /* LPASS8 */
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#endif /* TIOCLGET */
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}
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#if defined (TIOCGETC)
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# if defined (USE_XON_XOFF)
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/* Get rid of terminal output start and stop characters. */
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tiop->tchars.t_stopc = -1; /* C-s */
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tiop->tchars.t_startc = -1; /* C-q */
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/* If there is an XON character, bind it to restart the output. */
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if (otio.tchars.t_startc != -1)
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rl_bind_key (otio.tchars.t_startc, rl_restart_output);
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# endif /* USE_XON_XOFF */
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/* If there is an EOF char, bind _rl_eof_char to it. */
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if (otio.tchars.t_eofc != -1)
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_rl_eof_char = otio.tchars.t_eofc;
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# if defined (NO_KILL_INTR)
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/* Get rid of terminal-generated SIGQUIT and SIGINT. */
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tiop->tchars.t_quitc = -1; /* C-\ */
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tiop->tchars.t_intrc = -1; /* C-c */
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# endif /* NO_KILL_INTR */
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#endif /* TIOCGETC */
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#if defined (TIOCGLTC)
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/* Make the interrupt keys go away. Just enough to make people happy. */
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tiop->ltchars.t_dsuspc = -1; /* C-y */
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tiop->ltchars.t_lnextc = -1; /* C-v */
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#endif /* TIOCGLTC */
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#endif /* !__GO32__ */
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}
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#endif /* defined (NEW_TTY_DRIVER) */
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#if !defined (NEW_TTY_DRIVER) && !defined(__GO32__)
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#if !defined (VMIN)
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# define VMIN VEOF
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#endif
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#if !defined (VTIME)
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# define VTIME VEOL
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#endif
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#if defined (TERMIOS_TTY_DRIVER)
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# define TIOTYPE struct termios
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# define DRAIN_OUTPUT(fd) tcdrain (fd)
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# define GETATTR(tty, tiop) (tcgetattr (tty, tiop))
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# define SETATTR(tty, tiop) (tcsetattr (tty, TCSANOW, tiop))
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#else
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# define TIOTYPE struct termio
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# define DRAIN_OUTPUT(fd)
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# define GETATTR(tty, tiop) (ioctl (tty, TCGETA, tiop))
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# define SETATTR(tty, tiop) (ioctl (tty, TCSETA, tiop))
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#endif /* !TERMIOS_TTY_DRIVER */
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static TIOTYPE otio;
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static int
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get_tty_settings (tty, tiop)
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int tty;
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TIOTYPE *tiop;
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{
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while (GETATTR (tty, tiop) < 0)
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{
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if (errno != EINTR)
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return -1;
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errno = 0;
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}
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return 0;
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}
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static int
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set_tty_settings (tty, tiop)
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int tty;
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TIOTYPE *tiop;
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{
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while (SETATTR (tty, tiop) < 0)
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{
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if (errno != EINTR)
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return -1;
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errno = 0;
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}
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#if 0
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#if defined (TERMIOS_TTY_DRIVER)
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# if defined (__ksr1__)
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if (ksrflow)
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{
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ksrflow = 0;
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tcflow (tty, TCOON);
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}
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# else /* !ksr1 */
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tcflow (tty, TCOON); /* Simulate a ^Q. */
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# endif /* !ksr1 */
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#else
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ioctl (tty, TCXONC, 1); /* Simulate a ^Q. */
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#endif /* !TERMIOS_TTY_DRIVER */
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#endif
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return 0;
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}
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static void
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prepare_terminal_settings (meta_flag, otio, tiop)
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int meta_flag;
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TIOTYPE otio, *tiop;
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{
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readline_echoing_p = (otio.c_lflag & ECHO);
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tiop->c_lflag &= ~(ICANON | ECHO);
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if ((unsigned char) otio.c_cc[VEOF] != (unsigned char) _POSIX_VDISABLE)
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_rl_eof_char = otio.c_cc[VEOF];
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#if defined (USE_XON_XOFF)
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#if defined (IXANY)
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tiop->c_iflag &= ~(IXON | IXOFF | IXANY);
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#else
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/* `strict' Posix systems do not define IXANY. */
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tiop->c_iflag &= ~(IXON | IXOFF);
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#endif /* IXANY */
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#endif /* USE_XON_XOFF */
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/* Only turn this off if we are using all 8 bits. */
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if (((tiop->c_cflag & CSIZE) == CS8) || meta_flag)
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tiop->c_iflag &= ~(ISTRIP | INPCK);
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/* Make sure we differentiate between CR and NL on input. */
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tiop->c_iflag &= ~(ICRNL | INLCR);
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#if !defined (HANDLE_SIGNALS)
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tiop->c_lflag &= ~ISIG;
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#else
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tiop->c_lflag |= ISIG;
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#endif
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tiop->c_cc[VMIN] = 1;
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tiop->c_cc[VTIME] = 0;
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/* Turn off characters that we need on Posix systems with job control,
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just to be sure. This includes ^Y and ^V. This should not really
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be necessary. */
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#if defined (TERMIOS_TTY_DRIVER) && defined (_POSIX_VDISABLE)
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#if defined (VLNEXT)
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tiop->c_cc[VLNEXT] = _POSIX_VDISABLE;
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#endif
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#if defined (VDSUSP)
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tiop->c_cc[VDSUSP] = _POSIX_VDISABLE;
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#endif
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#endif /* TERMIOS_TTY_DRIVER && _POSIX_VDISABLE */
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}
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#endif /* !defined (NEW_TTY_DRIVER) && !defined(__GO32__) */
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/* Put the terminal in CBREAK mode so that we can detect key presses. */
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void
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rl_prep_terminal (meta_flag)
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int meta_flag;
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{
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#if !defined (__GO32__)
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int tty = fileno (rl_instream);
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TIOTYPE tio;
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if (terminal_prepped)
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return;
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/* Try to keep this function from being INTerrupted. */
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block_sigint ();
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if (get_tty_settings (tty, &tio) < 0)
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{
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release_sigint ();
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return;
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}
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otio = tio;
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prepare_terminal_settings (meta_flag, otio, &tio);
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if (set_tty_settings (tty, &tio) < 0)
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{
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release_sigint ();
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return;
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}
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control_meta_key (1);
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terminal_prepped = 1;
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release_sigint ();
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#endif /* !__GO32__ */
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}
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/* Restore the terminal's normal settings and modes. */
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void
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rl_deprep_terminal ()
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{
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#if !defined (__GO32__)
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int tty = fileno (rl_instream);
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if (!terminal_prepped)
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return;
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/* Try to keep this function from being INTerrupted. */
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block_sigint ();
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if (set_tty_settings (tty, &otio) < 0)
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{
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release_sigint ();
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return;
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}
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#ifdef NEW_TTY_DRIVER
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readline_echoing_p = 1;
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#endif
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control_meta_key (0);
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terminal_prepped = 0;
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release_sigint ();
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#endif /* !__GO32__ */
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}
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/* **************************************************************** */
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/* */
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/* Bogus Flow Control */
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/* */
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/* **************************************************************** */
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rl_restart_output (count, key)
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int count, key;
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{
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int fildes = fileno (rl_outstream);
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#if defined (TIOCSTART)
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#if defined (apollo)
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ioctl (&fildes, TIOCSTART, 0);
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#else
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ioctl (fildes, TIOCSTART, 0);
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#endif /* apollo */
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#else /* !TIOCSTART */
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# if defined (TERMIOS_TTY_DRIVER)
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# if defined (__ksr1__)
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if (ksrflow)
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{
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ksrflow = 0;
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tcflow (fildes, TCOON);
|
||
}
|
||
# else /* !ksr1 */
|
||
tcflow (fildes, TCOON); /* Simulate a ^Q. */
|
||
# endif /* !ksr1 */
|
||
# else /* !TERMIOS_TTY_DRIVER */
|
||
# if defined (TCXONC)
|
||
ioctl (fildes, TCXONC, TCOON);
|
||
# endif /* TCXONC */
|
||
# endif /* !TERMIOS_TTY_DRIVER */
|
||
#endif /* !TIOCSTART */
|
||
}
|
||
|
||
rl_stop_output (count, key)
|
||
int count, key;
|
||
{
|
||
int fildes = fileno (rl_instream);
|
||
|
||
#if defined (TIOCSTOP)
|
||
# if defined (apollo)
|
||
ioctl (&fildes, TIOCSTOP, 0);
|
||
# else
|
||
ioctl (fildes, TIOCSTOP, 0);
|
||
# endif /* apollo */
|
||
#else /* !TIOCSTOP */
|
||
# if defined (TERMIOS_TTY_DRIVER)
|
||
# if defined (__ksr1__)
|
||
ksrflow = 1;
|
||
# endif /* ksr1 */
|
||
tcflow (fildes, TCOOFF);
|
||
# else
|
||
# if defined (TCXONC)
|
||
ioctl (fildes, TCXONC, TCOON);
|
||
# endif /* TCXONC */
|
||
# endif /* !TERMIOS_TTY_DRIVER */
|
||
#endif /* !TIOCSTOP */
|
||
}
|
||
|
||
/* **************************************************************** */
|
||
/* */
|
||
/* Default Key Bindings */
|
||
/* */
|
||
/* **************************************************************** */
|
||
#if !defined (__GO32__)
|
||
void
|
||
rltty_set_default_bindings (kmap)
|
||
Keymap kmap;
|
||
{
|
||
TIOTYPE ttybuff;
|
||
int tty = fileno (rl_instream);
|
||
|
||
#if defined (NEW_TTY_DRIVER)
|
||
|
||
if (get_tty_settings (tty, &ttybuff) == 0)
|
||
{
|
||
if (ttybuff.flags & SGTTY_SET)
|
||
{
|
||
int erase, kill;
|
||
|
||
erase = ttybuff.sgttyb.sg_erase;
|
||
kill = ttybuff.sgttyb.sg_kill;
|
||
|
||
if (erase != -1 && kmap[erase].type == ISFUNC)
|
||
kmap[erase].function = rl_rubout;
|
||
|
||
if (kill != -1 && kmap[kill].type == ISFUNC)
|
||
kmap[kill].function = rl_unix_line_discard;
|
||
}
|
||
|
||
# if defined (TIOCGLTC)
|
||
|
||
if (ttybuff.flags & LTCHARS_SET)
|
||
{
|
||
int werase, nextc;
|
||
|
||
werase = ttybuff.ltchars.t_werasc;
|
||
nextc = ttybuff.ltchars.t_lnextc;
|
||
|
||
if (werase != -1 && kmap[werase].type == ISFUNC)
|
||
kmap[werase].function = rl_unix_word_rubout;
|
||
|
||
if (nextc != -1 && kmap[nextc].type == ISFUNC)
|
||
kmap[nextc].function = rl_quoted_insert;
|
||
}
|
||
}
|
||
# endif /* TIOCGLTC */
|
||
|
||
#else /* !NEW_TTY_DRIVER */
|
||
|
||
if (get_tty_settings (tty, &ttybuff) == 0)
|
||
{
|
||
unsigned char erase, kill;
|
||
|
||
erase = ttybuff.c_cc[VERASE];
|
||
kill = ttybuff.c_cc[VKILL];
|
||
|
||
if (erase != (unsigned char)_POSIX_VDISABLE &&
|
||
kmap[erase].type == ISFUNC)
|
||
kmap[erase].function = rl_rubout;
|
||
|
||
if (kill != (unsigned char)_POSIX_VDISABLE &&
|
||
kmap[kill].type == ISFUNC)
|
||
kmap[kill].function = rl_unix_line_discard;
|
||
|
||
# if defined (VLNEXT) && defined (TERMIOS_TTY_DRIVER)
|
||
{
|
||
unsigned char nextc;
|
||
|
||
nextc = ttybuff.c_cc[VLNEXT];
|
||
|
||
if (nextc != (unsigned char)_POSIX_VDISABLE &&
|
||
kmap[nextc].type == ISFUNC)
|
||
kmap[nextc].function = rl_quoted_insert;
|
||
}
|
||
# endif /* VLNEXT && TERMIOS_TTY_DRIVER */
|
||
|
||
# if defined (VWERASE) && defined (TERMIOS_TTY_DRIVER)
|
||
{
|
||
unsigned char werase;
|
||
|
||
werase = ttybuff.c_cc[VWERASE];
|
||
|
||
if (werase != (unsigned char)_POSIX_VDISABLE &&
|
||
kmap[werase].type == ISFUNC)
|
||
kmap[werase].function = rl_unix_word_rubout;
|
||
}
|
||
# endif /* VWERASE && TERMIOS_TTY_DRIVER */
|
||
}
|
||
#endif /* !NEW_TTY_DRIVER */
|
||
}
|
||
#endif /* !__GO32__ */
|