readline/input.c - third_party/binutils-gdb - Git at Google

 /* input.c -- character input functions for readline. */

 /* Copyright (C) 1994-2010 Free Software Foundation, Inc.

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

    Readline 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.

    Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
 */

 #define READLINE_LIBRARY

 #if defined (__TANDEM)
 #  include <floss.h>
 #endif

 #if defined (HAVE_CONFIG_H)
 #  include <config.h>
 #endif

 #include <sys/types.h>
 #include <fcntl.h>
 #if defined (HAVE_SYS_FILE_H)
 #  include <sys/file.h>
 #endif /* HAVE_SYS_FILE_H */

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

 #if defined (HAVE_STDLIB_H)
 #  include <stdlib.h>
 #else
 #  include "ansi_stdlib.h"
 #endif /* HAVE_STDLIB_H */

 #include "posixselect.h"

 #if defined (FIONREAD_IN_SYS_IOCTL)
 #  include <sys/ioctl.h>
 #endif

 #include <stdio.h>
 #include <errno.h>

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

 /* System-specific feature definitions and include files. */
 #include "rldefs.h"
 #include "rlmbutil.h"

 /* Some standard library routines. */
 #include "readline.h"

 #include "rlprivate.h"
 #include "rlshell.h"
 #include "xmalloc.h"

 /* What kind of non-blocking I/O do we have? */
 #if !defined (O_NDELAY) && defined (O_NONBLOCK)
 #  define O_NDELAY O_NONBLOCK	/* Posix style */
 #endif

 /* Non-null means it is a pointer to a function to run while waiting for
    character input. */
 rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL;

 rl_getc_func_t *rl_getc_function = rl_getc;

 static int _keyboard_input_timeout = 100000;		/* 0.1 seconds; it's in usec */

 static int ibuffer_space PARAMS((void));
 static int rl_get_char PARAMS((int *));
 static int rl_gather_tyi PARAMS((void));

 /* **************************************************************** */
 /*								    */
 /*			Character Input Buffering       	    */
 /*								    */
 /* **************************************************************** */

 static int pop_index, push_index;
 static unsigned char ibuffer[512];
 static int ibuffer_len = sizeof (ibuffer) - 1;

 #define any_typein (push_index != pop_index)

 int
 _rl_any_typein ()
 {
   return any_typein;
 }

 /* Return the amount of space available in the buffer for stuffing
    characters. */
 static int
 ibuffer_space ()
 {
   if (pop_index > push_index)
     return (pop_index - push_index - 1);
   else
     return (ibuffer_len - (push_index - pop_index));
 }

 /* Get a key from the buffer of characters to be read.
    Return the key in KEY.
    Result is KEY if there was a key, or 0 if there wasn't. */
 static int
 rl_get_char (key)
      int *key;
 {
   if (push_index == pop_index)
     return (0);

   *key = ibuffer[pop_index++];
 #if 0
   if (pop_index >= ibuffer_len)
 #else
   if (pop_index > ibuffer_len)
 #endif
     pop_index = 0;

   return (1);
 }

 /* Stuff KEY into the *front* of the input buffer.
    Returns non-zero if successful, zero if there is
    no space left in the buffer. */
 int
 _rl_unget_char (key)
      int key;
 {
   if (ibuffer_space ())
     {
       pop_index--;
       if (pop_index < 0)
 	pop_index = ibuffer_len;
       ibuffer[pop_index] = key;
       return (1);
     }
   return (0);
 }

 int
 _rl_pushed_input_available ()
 {
   return (push_index != pop_index);
 }

 /* If a character is available to be read, then read it and stuff it into
    IBUFFER.  Otherwise, just return.  Returns number of characters read
    (0 if none available) and -1 on error (EIO). */
 static int
 rl_gather_tyi ()
 {
   int tty;
   register int tem, result;
   int chars_avail, k;
   char input;
 #if defined(HAVE_SELECT)
   fd_set readfds, exceptfds;
   struct timeval timeout;
 #endif

   chars_avail = 0;
   tty = fileno (rl_instream);

 #if defined (HAVE_SELECT)
   FD_ZERO (&readfds);
   FD_ZERO (&exceptfds);
   FD_SET (tty, &readfds);
   FD_SET (tty, &exceptfds);
   USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
   result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout);
   if (result <= 0)
     return 0;	/* Nothing to read. */
 #endif

   result = -1;
 #if defined (FIONREAD)
   errno = 0;
   result = ioctl (tty, FIONREAD, &chars_avail);
   if (result == -1 && errno == EIO)
     return -1;
 #endif

 #if defined (O_NDELAY)
   if (result == -1)
     {
       tem = fcntl (tty, F_GETFL, 0);

       fcntl (tty, F_SETFL, (tem | O_NDELAY));
       chars_avail = read (tty, &input, 1);

       fcntl (tty, F_SETFL, tem);
       if (chars_avail == -1 && errno == EAGAIN)
 	return 0;
       if (chars_avail == 0)	/* EOF */
 	{
 	  rl_stuff_char (EOF);
 	  return (0);
 	}
     }
 #endif /* O_NDELAY */

 #if defined (__MINGW32__)
   /* Use getch/_kbhit to check for available console input, in the same way
      that we read it normally. */
    chars_avail = isatty (tty) ? _kbhit () : 0;
    result = 0;
 #endif

   /* If there's nothing available, don't waste time trying to read
      something. */
   if (chars_avail <= 0)
     return 0;

   tem = ibuffer_space ();

   if (chars_avail > tem)
     chars_avail = tem;

   /* One cannot read all of the available input.  I can only read a single
      character at a time, or else programs which require input can be
      thwarted.  If the buffer is larger than one character, I lose.
      Damn! */
   if (tem < ibuffer_len)
     chars_avail = 0;

   if (result != -1)
     {
       while (chars_avail--)
 	{
 	  RL_CHECK_SIGNALS ();
 	  k = (*rl_getc_function) (rl_instream);
 	  if (rl_stuff_char (k) == 0)
 	    break;			/* some problem; no more room */
 	  if (k == NEWLINE || k == RETURN)
 	    break;
 	}
     }
   else
     {
       if (chars_avail)
 	rl_stuff_char (input);
     }

   return 1;
 }

 int
 rl_set_keyboard_input_timeout (u)
      int u;
 {
   int o;

   o = _keyboard_input_timeout;
   if (u >= 0)
     _keyboard_input_timeout = u;
   return (o);
 }

 /* Is there input available to be read on the readline input file
    descriptor?  Only works if the system has select(2) or FIONREAD.
    Uses the value of _keyboard_input_timeout as the timeout; if another
    readline function wants to specify a timeout and not leave it up to
    the user, it should use _rl_input_queued(timeout_value_in_microseconds)
    instead. */
 int
 _rl_input_available ()
 {
 #if defined(HAVE_SELECT)
   fd_set readfds, exceptfds;
   struct timeval timeout;
 #endif
 #if !defined (HAVE_SELECT) && defined(FIONREAD)
   int chars_avail;
 #endif
   int tty;

   tty = fileno (rl_instream);

 #if defined (HAVE_SELECT)
   FD_ZERO (&readfds);
   FD_ZERO (&exceptfds);
   FD_SET (tty, &readfds);
   FD_SET (tty, &exceptfds);
   timeout.tv_sec = 0;
   timeout.tv_usec = _keyboard_input_timeout;
   return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
 #else

 #if defined (FIONREAD)
   if (ioctl (tty, FIONREAD, &chars_avail) == 0)
     return (chars_avail);
 #endif

 #endif

 #if defined (__MINGW32__)
   if (isatty (tty))
     return (_kbhit ());
 #endif

   return 0;
 }

 int
 _rl_input_queued (t)
      int t;
 {
   int old_timeout, r;

   old_timeout = rl_set_keyboard_input_timeout (t);
   r = _rl_input_available ();
   rl_set_keyboard_input_timeout (old_timeout);
   return r;
 }

 void
 _rl_insert_typein (c)
      int c;
 {
   int key, t, i;
   char *string;

   i = key = 0;
   string = (char *)xmalloc (ibuffer_len + 1);
   string[i++] = (char) c;

   while ((t = rl_get_char (&key)) &&
 	 _rl_keymap[key].type == ISFUNC &&
 	 _rl_keymap[key].function == rl_insert)
     string[i++] = key;

   if (t)
     _rl_unget_char (key);

   string[i] = '\0';
   rl_insert_text (string);
   xfree (string);
 }

 /* Add KEY to the buffer of characters to be read.  Returns 1 if the
    character was stuffed correctly; 0 otherwise. */
 int
 rl_stuff_char (key)
      int key;
 {
   if (ibuffer_space () == 0)
     return 0;

   if (key == EOF)
     {
       key = NEWLINE;
       rl_pending_input = EOF;
       RL_SETSTATE (RL_STATE_INPUTPENDING);
     }
   ibuffer[push_index++] = key;
 #if 0
   if (push_index >= ibuffer_len)
 #else
   if (push_index > ibuffer_len)
 #endif
     push_index = 0;

   return 1;
 }

 /* Make C be the next command to be executed. */
 int
 rl_execute_next (c)
      int c;
 {
   rl_pending_input = c;
   RL_SETSTATE (RL_STATE_INPUTPENDING);
   return 0;
 }

 /* Clear any pending input pushed with rl_execute_next() */
 int
 rl_clear_pending_input ()
 {
   rl_pending_input = 0;
   RL_UNSETSTATE (RL_STATE_INPUTPENDING);
   return 0;
 }

 /* **************************************************************** */
 /*								    */
 /*			     Character Input			    */
 /*								    */
 /* **************************************************************** */

 /* Read a key, including pending input. */
 int
 rl_read_key ()
 {
   int c;

   rl_key_sequence_length++;

   if (rl_pending_input)
     {
       c = rl_pending_input;
       rl_clear_pending_input ();
     }
   else
     {
       /* If input is coming from a macro, then use that. */
       if (c = _rl_next_macro_key ())
 	return (c);

       /* If the user has an event function, then call it periodically. */
       if (rl_event_hook)
 	{
 	  while (rl_event_hook)
 	    {
 	      if (rl_gather_tyi () < 0)	/* XXX - EIO */
 		{
 		  rl_done = 1;
 		  return ('\n');
 		}
 	      RL_CHECK_SIGNALS ();
 	      if (rl_get_char (&c) != 0)
 		break;
 	      if (rl_done)		/* XXX - experimental */
 		return ('\n');
 	      (*rl_event_hook) ();
 	    }
 	}
       else
 	{
 	  if (rl_get_char (&c) == 0)
 	    c = (*rl_getc_function) (rl_instream);
 	  RL_CHECK_SIGNALS ();
 	}
     }

   return (c);
 }

 int
 rl_getc (stream)
      FILE *stream;
 {
   int result;
   unsigned char c;

   while (1)
     {
       RL_CHECK_SIGNALS ();

 #if defined (__MINGW32__)
       if (isatty (fileno (stream)))
 	return (getch ());
 #endif
       result = read (fileno (stream), &c, sizeof (unsigned char));

       if (result == sizeof (unsigned char))
 	return (c);

       /* If zero characters are returned, then the file that we are
 	 reading from is empty!  Return EOF in that case. */
       if (result == 0)
 	return (EOF);

 #if defined (__BEOS__)
       if (errno == EINTR)
 	continue;
 #endif

 #if defined (EWOULDBLOCK)
 #  define X_EWOULDBLOCK EWOULDBLOCK
 #else
 #  define X_EWOULDBLOCK -99
 #endif

 #if defined (EAGAIN)
 #  define X_EAGAIN EAGAIN
 #else
 #  define X_EAGAIN -99
 #endif

       if (errno == X_EWOULDBLOCK || errno == X_EAGAIN)
 	{
 	  if (sh_unset_nodelay_mode (fileno (stream)) < 0)
 	    return (EOF);
 	  continue;
 	}

 #undef X_EWOULDBLOCK
 #undef X_EAGAIN

       /* If the error that we received was SIGINT, then try again,
 	 this is simply an interrupted system call to read ().
 	 Otherwise, some error ocurred, also signifying EOF. */
       if (errno != EINTR)
 	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
     }
 }

 #if defined (HANDLE_MULTIBYTE)
 /* read multibyte char */
 int
 _rl_read_mbchar (mbchar, size)
      char *mbchar;
      int size;
 {
   int mb_len, c;
   size_t mbchar_bytes_length;
   wchar_t wc;
   mbstate_t ps, ps_back;

   memset(&ps, 0, sizeof (mbstate_t));
   memset(&ps_back, 0, sizeof (mbstate_t));

   mb_len = 0;
   while (mb_len < size)
     {
       RL_SETSTATE(RL_STATE_MOREINPUT);
       c = rl_read_key ();
       RL_UNSETSTATE(RL_STATE_MOREINPUT);

       if (c < 0)
 	break;

       mbchar[mb_len++] = c;

       mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps);
       if (mbchar_bytes_length == (size_t)(-1))
 	break;		/* invalid byte sequence for the current locale */
       else if (mbchar_bytes_length == (size_t)(-2))
 	{
 	  /* shorted bytes */
 	  ps = ps_back;
 	  continue;
 	}
       else if (mbchar_bytes_length == 0)
 	{
 	  mbchar[0] = '\0';	/* null wide character */
 	  mb_len = 1;
 	  break;
 	}
       else if (mbchar_bytes_length > (size_t)(0))
 	break;
     }

   return mb_len;
 }

 /* Read a multibyte-character string whose first character is FIRST into
    the buffer MB of length MLEN.  Returns the last character read, which
    may be FIRST.  Used by the search functions, among others.  Very similar
    to _rl_read_mbchar. */
 int
 _rl_read_mbstring (first, mb, mlen)
      int first;
      char *mb;
      int mlen;
 {
   int i, c;
   mbstate_t ps;

   c = first;
   memset (mb, 0, mlen);
   for (i = 0; c >= 0 && i < mlen; i++)
     {
       mb[i] = (char)c;
       memset (&ps, 0, sizeof (mbstate_t));
       if (_rl_get_char_len (mb, &ps) == -2)
 	{
 	  /* Read more for multibyte character */
 	  RL_SETSTATE (RL_STATE_MOREINPUT);
 	  c = rl_read_key ();
 	  RL_UNSETSTATE (RL_STATE_MOREINPUT);
 	}
       else
 	break;
     }
   return c;
 }
 #endif /* HANDLE_MULTIBYTE */
	/* input.c -- character input functions for readline. */

	/* Copyright (C) 1994-2010 Free Software Foundation, Inc.

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

	Readline 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.

	Readline 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 Readline. If not, see <http://www.gnu.org/licenses/>.
	*/

	#define READLINE_LIBRARY

	#if defined (__TANDEM)
	# include <floss.h>
	#endif

	#if defined (HAVE_CONFIG_H)
	# include <config.h>
	#endif

	#include <sys/types.h>
	#include <fcntl.h>
	#if defined (HAVE_SYS_FILE_H)
	# include <sys/file.h>
	#endif /* HAVE_SYS_FILE_H */

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

	#if defined (HAVE_STDLIB_H)
	# include <stdlib.h>
	#else
	# include "ansi_stdlib.h"
	#endif /* HAVE_STDLIB_H */

	#include "posixselect.h"

	#if defined (FIONREAD_IN_SYS_IOCTL)
	# include <sys/ioctl.h>
	#endif

	#include <stdio.h>
	#include <errno.h>

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

	/* System-specific feature definitions and include files. */
	#include "rldefs.h"
	#include "rlmbutil.h"

	/* Some standard library routines. */
	#include "readline.h"

	#include "rlprivate.h"
	#include "rlshell.h"
	#include "xmalloc.h"

	/* What kind of non-blocking I/O do we have? */
	#if !defined (O_NDELAY) && defined (O_NONBLOCK)
	# define O_NDELAY O_NONBLOCK /* Posix style */
	#endif

	/* Non-null means it is a pointer to a function to run while waiting for
	character input. */
	rl_hook_func_t rl_event_hook = (rl_hook_func_t )NULL;

	rl_getc_func_t *rl_getc_function = rl_getc;

	static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */

	static int ibuffer_space PARAMS((void));
	static int rl_get_char PARAMS((int *));
	static int rl_gather_tyi PARAMS((void));

	/* **************************************************************** */
	/* */
	/* Character Input Buffering */
	/* */
	/* **************************************************************** */

	static int pop_index, push_index;
	static unsigned char ibuffer[512];
	static int ibuffer_len = sizeof (ibuffer) - 1;

	#define any_typein (push_index != pop_index)

	int
	_rl_any_typein ()
	{
	return any_typein;
	}

	/* Return the amount of space available in the buffer for stuffing
	characters. */
	static int
	ibuffer_space ()
	{
	if (pop_index > push_index)
	return (pop_index - push_index - 1);
	else
	return (ibuffer_len - (push_index - pop_index));
	}

	/* Get a key from the buffer of characters to be read.
	Return the key in KEY.
	Result is KEY if there was a key, or 0 if there wasn't. */
	static int
	rl_get_char (key)
	int *key;
	{
	if (push_index == pop_index)
	return (0);

	*key = ibuffer[pop_index++];
	#if 0
	if (pop_index >= ibuffer_len)
	#else
	if (pop_index > ibuffer_len)
	#endif
	pop_index = 0;

	return (1);
	}

	/* Stuff KEY into the front of the input buffer.
	Returns non-zero if successful, zero if there is
	no space left in the buffer. */
	int
	_rl_unget_char (key)
	int key;
	{
	if (ibuffer_space ())
	{
	pop_index--;
	if (pop_index < 0)
	pop_index = ibuffer_len;
	ibuffer[pop_index] = key;
	return (1);
	}
	return (0);
	}

	int
	_rl_pushed_input_available ()
	{
	return (push_index != pop_index);
	}

	/* If a character is available to be read, then read it and stuff it into
	IBUFFER. Otherwise, just return. Returns number of characters read
	(0 if none available) and -1 on error (EIO). */
	static int
	rl_gather_tyi ()
	{
	int tty;
	register int tem, result;
	int chars_avail, k;
	char input;
	#if defined(HAVE_SELECT)
	fd_set readfds, exceptfds;
	struct timeval timeout;
	#endif

	chars_avail = 0;
	tty = fileno (rl_instream);

	#if defined (HAVE_SELECT)
	FD_ZERO (&readfds);
	FD_ZERO (&exceptfds);
	FD_SET (tty, &readfds);
	FD_SET (tty, &exceptfds);
	USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
	result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout);
	if (result <= 0)
	return 0; /* Nothing to read. */
	#endif

	result = -1;
	#if defined (FIONREAD)
	errno = 0;
	result = ioctl (tty, FIONREAD, &chars_avail);
	if (result == -1 && errno == EIO)
	return -1;
	#endif

	#if defined (O_NDELAY)
	if (result == -1)
	{
	tem = fcntl (tty, F_GETFL, 0);

	fcntl (tty, F_SETFL, (tem \| O_NDELAY));
	chars_avail = read (tty, &input, 1);

	fcntl (tty, F_SETFL, tem);
	if (chars_avail == -1 && errno == EAGAIN)
	return 0;
	if (chars_avail == 0) /* EOF */
	{
	rl_stuff_char (EOF);
	return (0);
	}
	}
	#endif /* O_NDELAY */

	#if defined (__MINGW32__)
	/* Use getch/_kbhit to check for available console input, in the same way
	that we read it normally. */
	chars_avail = isatty (tty) ? _kbhit () : 0;
	result = 0;
	#endif

	/* If there's nothing available, don't waste time trying to read
	something. */
	if (chars_avail <= 0)
	return 0;

	tem = ibuffer_space ();

	if (chars_avail > tem)
	chars_avail = tem;

	/* One cannot read all of the available input. I can only read a single
	character at a time, or else programs which require input can be
	thwarted. If the buffer is larger than one character, I lose.
	Damn! */
	if (tem < ibuffer_len)
	chars_avail = 0;

	if (result != -1)
	{
	while (chars_avail--)
	{
	RL_CHECK_SIGNALS ();
	k = (*rl_getc_function) (rl_instream);
	if (rl_stuff_char (k) == 0)
	break; /* some problem; no more room */
	if (k == NEWLINE \|\| k == RETURN)
	break;
	}
	}
	else
	{
	if (chars_avail)
	rl_stuff_char (input);
	}

	return 1;
	}

	int
	rl_set_keyboard_input_timeout (u)
	int u;
	{
	int o;

	o = _keyboard_input_timeout;
	if (u >= 0)
	_keyboard_input_timeout = u;
	return (o);
	}

	/* Is there input available to be read on the readline input file
	descriptor? Only works if the system has select(2) or FIONREAD.
	Uses the value of _keyboard_input_timeout as the timeout; if another
	readline function wants to specify a timeout and not leave it up to
	the user, it should use _rl_input_queued(timeout_value_in_microseconds)
	instead. */
	int
	_rl_input_available ()
	{
	#if defined(HAVE_SELECT)
	fd_set readfds, exceptfds;
	struct timeval timeout;
	#endif
	#if !defined (HAVE_SELECT) && defined(FIONREAD)
	int chars_avail;
	#endif
	int tty;

	tty = fileno (rl_instream);

	#if defined (HAVE_SELECT)
	FD_ZERO (&readfds);
	FD_ZERO (&exceptfds);
	FD_SET (tty, &readfds);
	FD_SET (tty, &exceptfds);
	timeout.tv_sec = 0;
	timeout.tv_usec = _keyboard_input_timeout;
	return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
	#else

	#if defined (FIONREAD)
	if (ioctl (tty, FIONREAD, &chars_avail) == 0)
	return (chars_avail);
	#endif

	#endif

	#if defined (__MINGW32__)
	if (isatty (tty))
	return (_kbhit ());
	#endif

	return 0;
	}

	int
	_rl_input_queued (t)
	int t;
	{
	int old_timeout, r;

	old_timeout = rl_set_keyboard_input_timeout (t);
	r = _rl_input_available ();
	rl_set_keyboard_input_timeout (old_timeout);
	return r;
	}

	void
	_rl_insert_typein (c)
	int c;
	{
	int key, t, i;
	char *string;

	i = key = 0;
	string = (char *)xmalloc (ibuffer_len + 1);
	string[i++] = (char) c;

	while ((t = rl_get_char (&key)) &&
	_rl_keymap[key].type == ISFUNC &&
	_rl_keymap[key].function == rl_insert)
	string[i++] = key;

	if (t)
	_rl_unget_char (key);

	string[i] = '\0';
	rl_insert_text (string);
	xfree (string);
	}

	/* Add KEY to the buffer of characters to be read. Returns 1 if the
	character was stuffed correctly; 0 otherwise. */
	int
	rl_stuff_char (key)
	int key;
	{
	if (ibuffer_space () == 0)
	return 0;

	if (key == EOF)
	{
	key = NEWLINE;
	rl_pending_input = EOF;
	RL_SETSTATE (RL_STATE_INPUTPENDING);
	}
	ibuffer[push_index++] = key;
	#if 0
	if (push_index >= ibuffer_len)
	#else
	if (push_index > ibuffer_len)
	#endif
	push_index = 0;

	return 1;
	}

	/* Make C be the next command to be executed. */
	int
	rl_execute_next (c)
	int c;
	{
	rl_pending_input = c;
	RL_SETSTATE (RL_STATE_INPUTPENDING);
	return 0;
	}

	/* Clear any pending input pushed with rl_execute_next() */
	int
	rl_clear_pending_input ()
	{
	rl_pending_input = 0;
	RL_UNSETSTATE (RL_STATE_INPUTPENDING);
	return 0;
	}

	/* **************************************************************** */
	/* */
	/* Character Input */
	/* */
	/* **************************************************************** */

	/* Read a key, including pending input. */
	int
	rl_read_key ()
	{
	int c;

	rl_key_sequence_length++;

	if (rl_pending_input)
	{
	c = rl_pending_input;
	rl_clear_pending_input ();
	}
	else
	{
	/* If input is coming from a macro, then use that. */
	if (c = _rl_next_macro_key ())
	return (c);

	/* If the user has an event function, then call it periodically. */
	if (rl_event_hook)
	{
	while (rl_event_hook)
	{
	if (rl_gather_tyi () < 0) /* XXX - EIO */
	{
	rl_done = 1;
	return ('\n');
	}
	RL_CHECK_SIGNALS ();
	if (rl_get_char (&c) != 0)
	break;
	if (rl_done) /* XXX - experimental */
	return ('\n');
	(*rl_event_hook) ();
	}
	}
	else
	{
	if (rl_get_char (&c) == 0)
	c = (*rl_getc_function) (rl_instream);
	RL_CHECK_SIGNALS ();
	}
	}

	return (c);
	}

	int
	rl_getc (stream)
	FILE *stream;
	{
	int result;
	unsigned char c;

	while (1)
	{
	RL_CHECK_SIGNALS ();

	#if defined (__MINGW32__)
	if (isatty (fileno (stream)))
	return (getch ());
	#endif
	result = read (fileno (stream), &c, sizeof (unsigned char));

	if (result == sizeof (unsigned char))
	return (c);

	/* If zero characters are returned, then the file that we are
	reading from is empty! Return EOF in that case. */
	if (result == 0)
	return (EOF);

	#if defined (__BEOS__)
	if (errno == EINTR)
	continue;
	#endif

	#if defined (EWOULDBLOCK)
	# define X_EWOULDBLOCK EWOULDBLOCK
	#else
	# define X_EWOULDBLOCK -99
	#endif

	#if defined (EAGAIN)
	# define X_EAGAIN EAGAIN
	#else
	# define X_EAGAIN -99
	#endif

	if (errno == X_EWOULDBLOCK \|\| errno == X_EAGAIN)
	{
	if (sh_unset_nodelay_mode (fileno (stream)) < 0)
	return (EOF);
	continue;
	}

	#undef X_EWOULDBLOCK
	#undef X_EAGAIN

	/* If the error that we received was SIGINT, then try again,
	this is simply an interrupted system call to read ().
	Otherwise, some error ocurred, also signifying EOF. */
	if (errno != EINTR)
	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
	}
	}

	#if defined (HANDLE_MULTIBYTE)
	/* read multibyte char */
	int
	_rl_read_mbchar (mbchar, size)
	char *mbchar;
	int size;
	{
	int mb_len, c;
	size_t mbchar_bytes_length;
	wchar_t wc;
	mbstate_t ps, ps_back;

	memset(&ps, 0, sizeof (mbstate_t));
	memset(&ps_back, 0, sizeof (mbstate_t));

	mb_len = 0;
	while (mb_len < size)
	{
	RL_SETSTATE(RL_STATE_MOREINPUT);
	c = rl_read_key ();
	RL_UNSETSTATE(RL_STATE_MOREINPUT);

	if (c < 0)
	break;

	mbchar[mb_len++] = c;

	mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps);
	if (mbchar_bytes_length == (size_t)(-1))
	break; /* invalid byte sequence for the current locale */
	else if (mbchar_bytes_length == (size_t)(-2))
	{
	/* shorted bytes */
	ps = ps_back;
	continue;
	}
	else if (mbchar_bytes_length == 0)
	{
	mbchar[0] = '\0'; /* null wide character */
	mb_len = 1;
	break;
	}
	else if (mbchar_bytes_length > (size_t)(0))
	break;
	}

	return mb_len;
	}

	/* Read a multibyte-character string whose first character is FIRST into
	the buffer MB of length MLEN. Returns the last character read, which
	may be FIRST. Used by the search functions, among others. Very similar
	to _rl_read_mbchar. */
	int
	_rl_read_mbstring (first, mb, mlen)
	int first;
	char *mb;
	int mlen;
	{
	int i, c;
	mbstate_t ps;

	c = first;
	memset (mb, 0, mlen);
	for (i = 0; c >= 0 && i < mlen; i++)
	{
	mb[i] = (char)c;
	memset (&ps, 0, sizeof (mbstate_t));
	if (_rl_get_char_len (mb, &ps) == -2)
	{
	/* Read more for multibyte character */
	RL_SETSTATE (RL_STATE_MOREINPUT);
	c = rl_read_key ();
	RL_UNSETSTATE (RL_STATE_MOREINPUT);
	}
	else
	break;
	}
	return c;
	}
	#endif /* HANDLE_MULTIBYTE */