Adding upstream version 8.2.upstream/8.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1000 insertions, 0 deletions

diff --git a/input.c b/input.c
new file mode 100644
index 0000000..6f038d4
--- /dev/null
+++ b/input.c
@@ -0,0 +1,1000 @@
+/* input.c -- character input functions for readline. */
+
+/* Copyright (C) 1994-2021 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)
+#  define _XOPEN_SOURCE_EXTENDED 1
+#  define _TANDEM_SOURCE 1
+#  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 <signal.h>
+
+#include "posixselect.h"
+#include "posixtime.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
+
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+extern sigset_t _rl_orig_sigset;
+#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;
+
+/* A function to call if a read(2) is interrupted by a signal. */
+rl_hook_func_t *rl_signal_event_hook = (rl_hook_func_t *)NULL;
+
+/* A function to call when readline times out after a time is specified. */
+rl_hook_func_t *rl_timeout_event_hook = (rl_hook_func_t *)NULL;
+
+/* A function to replace _rl_input_available for applications using the
+   callback interface. */
+rl_hook_func_t *rl_input_available_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 (void);
+static int rl_get_char (int *);
+static int rl_gather_tyi (void);
+
+/* Windows isatty returns true for every character device, including the null
+   device, so we need to perform additional checks. */
+#if defined (_WIN32) && !defined (__CYGWIN__)
+#include <io.h>
+#include <conio.h>
+#define WIN32_LEAN_AND_MEAN 1
+#include <windows.h>
+
+int
+win32_isatty (int fd)
+{
+  if (_isatty(fd))
+    {
+      HANDLE h;
+      DWORD ignored;
+
+      if ((h = (HANDLE) _get_osfhandle (fd)) == INVALID_HANDLE_VALUE)
+	{
+	  errno = EBADF;
+	  return 0;
+	}
+      if (GetConsoleMode (h, &ignored) != 0)
+	return 1;
+    }
+  errno = ENOTTY;
+  return 0;
+}
+
+#define isatty(x)	win32_isatty(x)
+#endif
+
+/* Readline timeouts */
+
+/* I don't know how to set a timeout for _getch() in MinGW32, so we use
+   SIGALRM. */
+#if (defined (HAVE_PSELECT) || defined (HAVE_SELECT)) && !defined (__MINGW32__)
+#  define RL_TIMEOUT_USE_SELECT
+#else
+#  define RL_TIMEOUT_USE_SIGALRM
+#endif
+
+int rl_set_timeout (unsigned int, unsigned int);
+int rl_timeout_remaining (unsigned int *, unsigned int *);
+
+int _rl_timeout_init (void);
+int _rl_timeout_sigalrm_handler (void);
+int _rl_timeout_select (int, fd_set *, fd_set *, fd_set *, const struct timeval *, const sigset_t *);
+
+static void _rl_timeout_handle (void);
+#if defined (RL_TIMEOUT_USE_SIGALRM)
+static int set_alarm (unsigned int *, unsigned int *);
+static void reset_alarm (void);
+#endif
+
+/* We implement timeouts as a future time using a supplied interval
+   (timeout_duration) from when the timeout is set (timeout_point).
+   That allows us to easily determine whether the timeout has occurred
+   and compute the time remaining until it does. */
+static struct timeval timeout_point;
+static struct timeval timeout_duration;
+
+/* **************************************************************** */
+/*								    */
+/*			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 (void)
+{
+  return any_typein;
+}
+
+int
+_rl_pushed_input_available (void)
+{
+  return (push_index != pop_index);
+}
+
+/* Return the amount of space available in the buffer for stuffing
+   characters. */
+static int
+ibuffer_space (void)
+{
+  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 non-zero if there was a key, or 0 if there wasn't. */
+static int
+rl_get_char (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 (int key)
+{
+  if (ibuffer_space ())
+    {
+      pop_index--;
+      if (pop_index < 0)
+	pop_index = ibuffer_len;
+      ibuffer[pop_index] = key;
+      return (1);
+    }
+  return (0);
+}
+
+/* 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 (void)
+{
+  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;
+  input = 0;
+  tty = fileno (rl_instream);
+
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+  FD_ZERO (&readfds);
+  FD_ZERO (&exceptfds);
+  FD_SET (tty, &readfds);
+  FD_SET (tty, &exceptfds);
+  USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
+#if defined (RL_TIMEOUT_USE_SELECT)
+  result = _rl_timeout_select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout, NULL);
+#else
+  result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout);
+#endif
+  if (result <= 0)
+    return 0;	/* Nothing to read. */
+#endif
+
+  result = -1;
+  errno = 0;
+#if defined (FIONREAD)
+  result = ioctl (tty, FIONREAD, &chars_avail);
+  if (result == -1 && errno == EIO)
+    return -1;
+  if (result == -1)
+    chars_avail = 0;
+#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 == -1 && errno == EIO)
+	return -1;
+      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 (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 (void)
+{
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+  fd_set readfds, exceptfds;
+  struct timeval timeout;
+#endif
+#if !defined (HAVE_SELECT) && defined (FIONREAD)
+  int chars_avail;
+#endif
+  int tty;
+
+  if (rl_input_available_hook)
+    return (*rl_input_available_hook) ();
+
+  tty = fileno (rl_instream);
+
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+  FD_ZERO (&readfds);
+  FD_ZERO (&exceptfds);
+  FD_SET (tty, &readfds);
+  FD_SET (tty, &exceptfds);
+  USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
+#  if defined (RL_TIMEOUT_USE_SELECT)
+  return (_rl_timeout_select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout, NULL) > 0);
+#  else
+  return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
+#  endif
+#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_nchars_available ()
+{
+  int chars_avail, fd, result;
+  
+  chars_avail = 0;
+     
+#if defined (FIONREAD)
+  fd = fileno (rl_instream);
+  errno = 0;    
+  result = ioctl (fd, FIONREAD, &chars_avail);    
+  if (result == -1 && errno == EIO)    
+    return -1;    
+#endif
+
+  return chars_avail;
+}
+
+int
+_rl_input_queued (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 (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 (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 (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 (void)
+{
+  rl_pending_input = 0;
+  RL_UNSETSTATE (RL_STATE_INPUTPENDING);
+  return 0;
+}
+
+/* **************************************************************** */
+/*								    */
+/*			    Timeout utility			    */
+/*								    */
+/* **************************************************************** */
+
+#if defined (RL_TIMEOUT_USE_SIGALRM)
+#  if defined (HAVE_SETITIMER)
+
+static int
+set_alarm (unsigned int *secs, unsigned int *usecs)
+{
+  struct itimerval it;
+
+  timerclear (&it.it_interval);
+  timerset (&it.it_value, *secs, *usecs);
+  return setitimer (ITIMER_REAL, &it, NULL);
+}
+
+static void
+reset_alarm ()
+{
+  struct itimerval it;
+
+  timerclear (&it.it_interval);
+  timerclear (&it.it_value);
+  setitimer (ITIMER_REAL, &it, NULL);
+}
+#  else
+static int
+set_alarm (unsigned int *secs, unsigned int *usecs)
+{
+  if (*secs == 0 || *usecs >= USEC_PER_SEC / 2)
+    (*secs)++;
+  *usecs = 0;
+
+  return alarm (*secs);
+}
+static void
+reset_alarm ()
+{
+  alarm (0);
+}
+#  endif
+#endif
+
+/* Set a timeout which will be used for the next call of `readline
+   ()'.  When (0, 0) are specified the timeout is cleared.  */
+int
+rl_set_timeout (unsigned int secs, unsigned int usecs)
+{
+  timeout_duration.tv_sec = secs + usecs / USEC_PER_SEC;
+  timeout_duration.tv_usec = usecs % USEC_PER_SEC;
+
+  return 0;
+}
+
+/* Start measuring the time.  Returns 0 on success.  Returns -1 on
+   error. */
+int
+_rl_timeout_init (void)
+{
+  unsigned int secs, usecs;
+
+  /* Clear the timeout state of the previous edit */
+  RL_UNSETSTATE(RL_STATE_TIMEOUT);
+  timerclear (&timeout_point);
+
+  /* Return 0 when timeout is unset. */
+  if (timerisunset (&timeout_duration))
+    return 0;
+
+  /* Return -1 on gettimeofday error. */
+  if (gettimeofday(&timeout_point, 0) != 0)
+    {
+      timerclear (&timeout_point);
+      return -1;
+    }
+
+  secs = timeout_duration.tv_sec;
+  usecs = timeout_duration.tv_usec;
+
+#if defined (RL_TIMEOUT_USE_SIGALRM)
+  /* If select(2)/pselect(2) is unavailable, use SIGALRM. */
+  if (set_alarm (&secs, &usecs) < 0)
+    return -1;
+#endif
+
+  timeout_point.tv_sec += secs;
+  timeout_point.tv_usec += usecs;
+  if (timeout_point.tv_usec >= USEC_PER_SEC)
+    {
+      timeout_point.tv_sec++;
+      timeout_point.tv_usec -= USEC_PER_SEC;
+    }
+
+  return 0;
+}
+
+/* Get the remaining time until the scheduled timeout.  Returns -1 on
+   error or no timeout set with secs and usecs unchanged.  Returns 0
+   on an expired timeout with secs and usecs unchanged.  Returns 1
+   when the timeout has not yet expired.  The remaining time is stored
+   in secs and usecs.  When NULL is specified to either of the
+   arguments, just the expiration is tested. */
+int
+rl_timeout_remaining (unsigned int *secs, unsigned int *usecs)
+{
+  struct timeval current_time;
+
+  /* Return -1 when timeout is unset. */
+  if (timerisunset (&timeout_point))
+    {
+      errno = 0;
+      return -1;
+    }
+
+  /* Return -1 on error. errno is set by gettimeofday. */
+  if (gettimeofday(&current_time, 0) != 0)
+    return -1;
+
+  /* Return 0 when timeout has already expired. */
+  /* could use timercmp (&timeout_point, &current_time, <) here */
+  if (current_time.tv_sec > timeout_point.tv_sec ||
+	(current_time.tv_sec == timeout_point.tv_sec &&
+	 current_time.tv_usec >= timeout_point.tv_usec))
+    return 0;
+
+  if (secs && usecs)
+    {
+      *secs = timeout_point.tv_sec - current_time.tv_sec;
+      *usecs = timeout_point.tv_usec - current_time.tv_usec;
+      if (timeout_point.tv_usec < current_time.tv_usec)
+	{
+	  (*secs)--;
+	  *usecs += USEC_PER_SEC;
+	}
+    }
+
+  return 1;
+}
+
+/* This should only be called if RL_TIMEOUT_USE_SELECT is defined. */
+
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+int
+_rl_timeout_select (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, const struct timeval *timeout, const sigset_t *sigmask)
+{
+  int result;
+#if defined (HAVE_PSELECT)
+  struct timespec ts;
+#else
+  sigset_t origmask;
+  struct timeval tv;
+#endif
+  int tmout_status;
+  struct timeval tmout;
+  unsigned int sec, usec;
+
+  /* When the remaining time for rl_timeout is shorter than the
+     keyboard input timeout, replace `timeout' with the remaining time
+     for `rl_timeout' and set `tmout_status = 1'. */
+  tmout_status = rl_timeout_remaining (&sec, &usec);
+  tmout.tv_sec = sec;
+  tmout.tv_usec = usec;
+
+  if (tmout_status == 0)
+    _rl_timeout_handle ();
+  else if (tmout_status == 1)
+    {
+      if (timeout == NULL || timercmp (&tmout, timeout, <))
+	timeout = &tmout;
+      else
+	tmout_status = -1;
+    }
+
+#if defined (HAVE_PSELECT)
+  if (timeout)
+    {
+      TIMEVAL_TO_TIMESPEC (timeout, &ts);
+      result = pselect (nfds, readfds, writefds, exceptfds, &ts, sigmask);
+    }
+  else
+    result = pselect (nfds, readfds, writefds, exceptfds, NULL, sigmask);
+#else
+  if (sigmask)
+    sigprocmask (SIG_SETMASK, sigmask, &origmask);
+
+  if (timeout)
+    {
+      tv.tv_sec = timeout->tv_sec;
+      tv.tv_usec = timeout->tv_usec;
+      result = select (nfds, readfds, writefds, exceptfds, &tv);
+    }
+  else
+    result = select (nfds, readfds, writefds, exceptfds, NULL);
+
+  if (sigmask)
+    sigprocmask (SIG_SETMASK, &origmask, NULL);
+#endif
+
+  if (tmout_status == 1 && result == 0)
+    _rl_timeout_handle ();
+
+  return result;
+}
+#endif
+
+static void
+_rl_timeout_handle ()
+{
+  if (rl_timeout_event_hook)
+    (*rl_timeout_event_hook) ();
+
+  RL_SETSTATE(RL_STATE_TIMEOUT);
+  _rl_abort_internal ();
+}
+
+int
+_rl_timeout_handle_sigalrm ()
+{
+#if defined (RL_TIMEOUT_USE_SIGALRM)
+  if (timerisunset (&timeout_point))
+    return -1;
+
+  /* Reset `timeout_point' to the current time to ensure that later
+     calls of `rl_timeout_pending ()' return 0 (timeout expired). */
+  if (gettimeofday(&timeout_point, 0) != 0)
+    timerclear (&timeout_point);
+
+  reset_alarm ();
+
+  _rl_timeout_handle ();
+#endif
+  return -1;
+}
+/* **************************************************************** */
+/*								    */
+/*			     Character Input			    */
+/*								    */
+/* **************************************************************** */
+
+/* Read a key, including pending input. */
+int
+rl_read_key (void)
+{
+  int c, r;
+
+  if (rl_pending_input)
+    {
+      c = rl_pending_input;	/* XXX - cast to unsigned char if > 0? */
+      rl_clear_pending_input ();
+    }
+  else
+    {
+      /* If input is coming from a macro, then use that. */
+      if (c = _rl_next_macro_key ())
+	return ((unsigned char)c);
+
+      /* If the user has an event function, then call it periodically. */
+      if (rl_event_hook)
+	{
+	  while (rl_event_hook)
+	    {
+	      if (rl_get_char (&c) != 0)
+		break;
+		
+	      if ((r = rl_gather_tyi ()) < 0)	/* XXX - EIO */
+		{
+		  rl_done = 1;
+		  RL_SETSTATE (RL_STATE_DONE);
+		  return (errno == EIO ? (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF) : '\n');
+		}
+	      else if (r > 0)			/* read something */
+		continue;
+
+	      RL_CHECK_SIGNALS ();
+	      if (rl_done)		/* XXX - experimental */
+		return ('\n');
+	      (*rl_event_hook) ();
+	    }
+	}
+      else
+	{
+	  if (rl_get_char (&c) == 0)
+	    c = (*rl_getc_function) (rl_instream);
+/* fprintf(stderr, "rl_read_key: calling RL_CHECK_SIGNALS: _rl_caught_signal = %d\r\n", _rl_caught_signal); */
+	  RL_CHECK_SIGNALS ();
+	}
+    }
+
+  return (c);
+}
+
+int
+rl_getc (FILE *stream)
+{
+  int result;
+  unsigned char c;
+  int fd;
+#if defined (HAVE_PSELECT)
+  sigset_t empty_set;
+  fd_set readfds;
+#endif
+
+  fd = fileno (stream);
+  while (1)
+    {
+      RL_CHECK_SIGNALS ();
+
+      /* We know at this point that _rl_caught_signal == 0 */
+
+#if defined (__MINGW32__)
+      if (isatty (fd)
+	return (_getch ());	/* "There is no error return." */
+#endif
+      result = 0;
+#if defined (HAVE_PSELECT) || defined (HAVE_SELECT)
+      /* At this point, if we have pselect, we're using select/pselect for the
+	 timeouts. We handled MinGW above. */
+      FD_ZERO (&readfds);
+      FD_SET (fd, &readfds);
+#  if defined (HANDLE_SIGNALS)
+      result = _rl_timeout_select (fd + 1, &readfds, NULL, NULL, NULL, &_rl_orig_sigset);
+#  else
+      sigemptyset (&empty_set);
+      sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &empty_set);
+      result = _rl_timeout_select (fd + 1, &readfds, NULL, NULL, NULL, &empty_set);
+#  endif /* HANDLE_SIGNALS */
+      if (result == 0)
+        _rl_timeout_handle ();		/* check the timeout */
+#endif
+      if (result >= 0)
+	result = read (fd, &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 (fd) < 0)
+	    return (EOF);
+	  continue;
+	}
+
+#undef X_EWOULDBLOCK
+#undef X_EAGAIN
+
+/* fprintf(stderr, "rl_getc: result = %d errno = %d\n", result, errno); */
+
+handle_error:
+      /* If the error that we received was EINTR, then try again,
+	 this is simply an interrupted system call to read ().  We allow
+	 the read to be interrupted if we caught SIGHUP, SIGTERM, or any
+	 of the other signals readline treats specially. If the
+	 application sets an event hook, call it for other signals.
+	 Otherwise (not EINTR), some error occurred, also signifying EOF. */
+      if (errno != EINTR)
+	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
+      /* fatal signals of interest */
+#if defined (SIGHUP)
+      else if (_rl_caught_signal == SIGHUP || _rl_caught_signal == SIGTERM)
+#else
+      else if (_rl_caught_signal == SIGTERM)
+#endif
+	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
+      /* keyboard-generated signals of interest */
+#if defined (SIGQUIT)
+      else if (_rl_caught_signal == SIGINT || _rl_caught_signal == SIGQUIT)
+#else
+      else if (_rl_caught_signal == SIGINT)
+#endif
+        RL_CHECK_SIGNALS ();
+#if defined (SIGTSTP)
+      else if (_rl_caught_signal == SIGTSTP)
+	RL_CHECK_SIGNALS ();
+#endif
+      /* non-keyboard-generated signals of interest */
+#if defined (SIGWINCH)
+      else if (_rl_caught_signal == SIGWINCH)
+	RL_CHECK_SIGNALS ();
+#endif /* SIGWINCH */
+#if defined (SIGALRM)
+      else if (_rl_caught_signal == SIGALRM
+#  if defined (SIGVTALRM)
+		|| _rl_caught_signal == SIGVTALRM
+#  endif
+	      )
+        RL_CHECK_SIGNALS ();
+#endif  /* SIGALRM */
+
+      if (rl_signal_event_hook)
+	(*rl_signal_event_hook) ();
+    }
+}
+
+#if defined (HANDLE_MULTIBYTE)
+/* read multibyte char */
+int
+_rl_read_mbchar (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)
+    {
+      c = (mb_len == 0) ? _rl_bracketed_read_key () : rl_read_key ();
+
+      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 (int first, char *mb, int mlen)
+{
+  int i, c, n;
+  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));
+      n = _rl_get_char_len (mb, &ps);
+      if (n == -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 */