rltty.c

Linux下的MUD客户端程序

/* rltty.c -- functions to prepare and restore the terminal for readline's
   use. */

/* Copyright (C) 1992 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline Library 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 1, or
   (at your option) any later version.

   The GNU Readline Library 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.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY

#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <stdio.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif /* HAVE_UNISTD_H */

#include "rldefs.h"
#include "readline.h"

#if !defined (errno)
extern int errno;
#endif /* !errno */

extern int readline_echoing_p;
extern int _rl_eof_char;

#if defined (__GO32__)
#  include <sys/pc.h>
#  undef HANDLE_SIGNALS
#endif /* __GO32__ */

static int output_was_flushed;

/* **************************************************************** */
/*								    */
/*			   Signal Management			    */
/*								    */
/* **************************************************************** */

#if defined (HAVE_POSIX_SIGNALS)
static sigset_t sigint_set, sigint_oset;
#else /* !HAVE_POSIX_SIGNALS */
#  if defined (HAVE_BSD_SIGNALS)
static int sigint_oldmask;
#  endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

static int sigint_blocked = 0;

/* Cause SIGINT to not be delivered until the corresponding call to
   release_sigint(). */
static void
block_sigint ()
{
  if (sigint_blocked)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigemptyset (&sigint_set);
  sigemptyset (&sigint_oset);
  sigaddset (&sigint_set, SIGINT);
  sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
#else /* !HAVE_POSIX_SIGNALS */
#  if defined (HAVE_BSD_SIGNALS)
  sigint_oldmask = sigblock (sigmask (SIGINT));
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sighold (SIGINT);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */
  sigint_blocked = 1;
}

/* Allow SIGINT to be delivered. */
static void
release_sigint ()
{
  if (!sigint_blocked)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
#else
#  if defined (HAVE_BSD_SIGNALS)
  sigsetmask (sigint_oldmask);
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sigrelse (SIGINT);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

  sigint_blocked = 0;
}

/* **************************************************************** */
/*								    */
/*	 	Controlling the Meta Key and Keypad		    */
/*								    */
/* **************************************************************** */

extern int term_has_meta;
extern char *term_mm;
extern char *term_mo;

extern char *term_ks;
extern char *term_ke;

static int
outchar (c)
     int c;
{
  return putc (c, rl_outstream);
}

/* Turn on/off the meta key depending on ON. */
static void
control_meta_key (on)
     int on;
{
  if (term_has_meta)
    {
      if (on && term_mm)
	tputs (term_mm, 1, outchar);
      else if (!on && term_mo)
	tputs (term_mo, 1, outchar);
    }
}

static void
control_keypad (on)
     int on;
{
  if (on && term_ks)
    tputs (term_ks, 1, outchar);
  else if (!on && term_ke)
    tputs (term_ke, 1, outchar);
}

/* **************************************************************** */
/*								    */
/*		      Saving and Restoring the TTY	    	    */
/*								    */
/* **************************************************************** */

/* Non-zero means that the terminal is in a prepped state. */
static int terminal_prepped = 0;

/* If non-zero, means that this process has called tcflow(fd, TCOOFF)
   and output is suspended. */
#if defined (__ksr1__)
static int ksrflow = 0;
#endif
#if defined (NEW_TTY_DRIVER)

/* Values for the `flags' field of a struct bsdtty.  This tells which
   elements of the struct bsdtty have been fetched from the system and
   are valid. */
#define SGTTY_SET	0x01
#define LFLAG_SET	0x02
#define TCHARS_SET	0x04
#define LTCHARS_SET	0x08

struct bsdtty {
  struct sgttyb sgttyb;	/* Basic BSD tty driver information. */
  int lflag;		/* Local mode flags, like LPASS8. */
#if defined (TIOCGETC)
  struct tchars tchars;	/* Terminal special characters, including ^S and ^Q. */
#endif
#if defined (TIOCGLTC)
  struct ltchars ltchars; /* 4.2 BSD editing characters */
#endif
  int flags;		/* Bitmap saying which parts of the struct are valid. */
};

#define TIOTYPE struct bsdtty

static TIOTYPE otio;

static int
get_tty_settings (tty, tiop)
     int tty;
     TIOTYPE *tiop;
{
#if !defined (SHELL) && defined (TIOCGWINSZ)
  struct winsize w;

  if (ioctl (tty, TIOCGWINSZ, &w) == 0)
      (void) ioctl (tty, TIOCSWINSZ, &w);
#endif

  tiop->flags = tiop->lflag = 0;

  ioctl (tty, TIOCGETP, &(tiop->sgttyb));
  tiop->flags |= SGTTY_SET;

#if defined (TIOCLGET)
  ioctl (tty, TIOCLGET, &(tiop->lflag));
  tiop->flags |= LFLAG_SET;
#endif

#if defined (TIOCGETC)
  ioctl (tty, TIOCGETC, &(tiop->tchars));
  tiop->flags |= TCHARS_SET;
#endif

#if defined (TIOCGLTC)
  ioctl (tty, TIOCGLTC, &(tiop->ltchars));
  tiop->flags |= LTCHARS_SET;
#endif

  return 0;
}

set_tty_settings (tty, tiop)
     int tty;
     TIOTYPE *tiop;
{
  if (tiop->flags & SGTTY_SET)
    {
      ioctl (tty, TIOCSETN, &(tiop->sgttyb));
      tiop->flags &= ~SGTTY_SET;
    }
  readline_echoing_p = 1;

#if defined (TIOCLSET)
  if (tiop->flags & LFLAG_SET)
    {
      ioctl (tty, TIOCLSET, &(tiop->lflag));
      tiop->flags &= ~LFLAG_SET;
    }
#endif

#if defined (TIOCSETC)
  if (tiop->flags & TCHARS_SET)
    {
      ioctl (tty, TIOCSETC, &(tiop->tchars));
      tiop->flags &= ~TCHARS_SET;
    }
#endif

#if defined (TIOCSLTC)
  if (tiop->flags & LTCHARS_SET)
    {
      ioctl (tty, TIOCSLTC, &(tiop->ltchars));
      tiop->flags &= ~LTCHARS_SET;
    }
#endif

  return 0;
}

static void
prepare_terminal_settings (meta_flag, otio, tiop)
     int meta_flag;
     TIOTYPE otio, *tiop;
{
#if !defined (__GO32__)
  readline_echoing_p = (otio.sgttyb.sg_flags & ECHO);

  /* Copy the original settings to the structure we're going to use for
     our settings. */
  tiop->sgttyb = otio.sgttyb;
  tiop->lflag = otio.lflag;
#if defined (TIOCGETC)
  tiop->tchars = otio.tchars;
#endif
#if defined (TIOCGLTC)
  tiop->ltchars = otio.ltchars;
#endif
  tiop->flags = otio.flags;

  /* First, the basic settings to put us into character-at-a-time, no-echo
     input mode. */
  tiop->sgttyb.sg_flags &= ~(ECHO | CRMOD);
  tiop->sgttyb.sg_flags |= CBREAK;

  /* If this terminal doesn't care how the 8th bit is used, then we can
     use it for the meta-key.  If only one of even or odd parity is
     specified, then the terminal is using parity, and we cannot. */
#if !defined (ANYP)
#  define ANYP (EVENP | ODDP)
#endif
  if (((otio.sgttyb.sg_flags & ANYP) == ANYP) ||
      ((otio.sgttyb.sg_flags & ANYP) == 0))
    {
      tiop->sgttyb.sg_flags |= ANYP;

      /* Hack on local mode flags if we can. */
#if defined (TIOCLGET)
#  if defined (LPASS8)
      tiop->lflag |= LPASS8;
#  endif /* LPASS8 */
#endif /* TIOCLGET */
    }

#if defined (TIOCGETC)
#  if defined (USE_XON_XOFF)
  /* Get rid of terminal output start and stop characters. */
  tiop->tchars.t_stopc = -1; /* C-s */
  tiop->tchars.t_startc = -1; /* C-q */

  /* If there is an XON character, bind it to restart the output. */
  if (otio.tchars.t_startc != -1)
    rl_bind_key (otio.tchars.t_startc, rl_restart_output);
#  endif /* USE_XON_XOFF */

  /* If there is an EOF char, bind _rl_eof_char to it. */
  if (otio.tchars.t_eofc != -1)
    _rl_eof_char = otio.tchars.t_eofc;

#  if defined (NO_KILL_INTR)
  /* Get rid of terminal-generated SIGQUIT and SIGINT. */
  tiop->tchars.t_quitc = -1; /* C-\ */
  tiop->tchars.t_intrc = -1; /* C-c */
#  endif /* NO_KILL_INTR */
#endif /* TIOCGETC */

#if defined (TIOCGLTC)
  /* Make the interrupt keys go away.  Just enough to make people happy. */
  tiop->ltchars.t_dsuspc = -1;	/* C-y */
  tiop->ltchars.t_lnextc = -1;	/* C-v */
#endif /* TIOCGLTC */
#endif /* !__GO32__ */
}

#else  /* !defined (NEW_TTY_DRIVER) */

#if !defined (VMIN)
#  define VMIN VEOF
#endif