Adding upstream version 5.2.15.upstream/5.2.15upstream

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

1 files changed, 1273 insertions, 0 deletions

diff --git a/builtins/read.def b/builtins/read.def
new file mode 100644
index 0000000..ddd91d3
--- /dev/null
+++ b/builtins/read.def
@@ -0,0 +1,1273 @@
+This file is read.def, from which is created read.c.
+It implements the builtin "read" in Bash.
+
+Copyright (C) 1987-2021 Free Software Foundation, Inc.
+
+This file is part of GNU Bash, the Bourne Again SHell.
+
+Bash 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.
+
+Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+
+$PRODUCES read.c
+
+$BUILTIN read
+$FUNCTION read_builtin
+$SHORT_DOC read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]
+Read a line from the standard input and split it into fields.
+
+Reads a single line from the standard input, or from file descriptor FD
+if the -u option is supplied.  The line is split into fields as with word
+splitting, and the first word is assigned to the first NAME, the second
+word to the second NAME, and so on, with any leftover words assigned to
+the last NAME.  Only the characters found in $IFS are recognized as word
+delimiters. By default, the backslash character escapes delimiter characters
+and newline.
+
+If no NAMEs are supplied, the line read is stored in the REPLY variable.
+
+Options:
+  -a array	assign the words read to sequential indices of the array
+		variable ARRAY, starting at zero
+  -d delim	continue until the first character of DELIM is read, rather
+		than newline
+  -e	use Readline to obtain the line
+  -i text	use TEXT as the initial text for Readline
+  -n nchars	return after reading NCHARS characters rather than waiting
+		for a newline, but honor a delimiter if fewer than
+		NCHARS characters are read before the delimiter
+  -N nchars	return only after reading exactly NCHARS characters, unless
+		EOF is encountered or read times out, ignoring any
+		delimiter
+  -p prompt	output the string PROMPT without a trailing newline before
+		attempting to read
+  -r	do not allow backslashes to escape any characters
+  -s	do not echo input coming from a terminal
+  -t timeout	time out and return failure if a complete line of
+		input is not read within TIMEOUT seconds.  The value of the
+		TMOUT variable is the default timeout.  TIMEOUT may be a
+		fractional number.  If TIMEOUT is 0, read returns
+		immediately, without trying to read any data, returning
+		success only if input is available on the specified
+		file descriptor.  The exit status is greater than 128
+		if the timeout is exceeded
+  -u fd	read from file descriptor FD instead of the standard input
+
+Exit Status:
+The return code is zero, unless end-of-file is encountered, read times out
+(in which case it's greater than 128), a variable assignment error occurs,
+or an invalid file descriptor is supplied as the argument to -u.
+$END
+
+#include <config.h>
+
+#include "bashtypes.h"
+#include "posixstat.h"
+
+#include <stdio.h>
+
+#include "bashansi.h"
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <signal.h>
+#include <errno.h>
+
+#ifdef __CYGWIN__
+#  include <fcntl.h>
+#  include <io.h>
+#endif
+
+#include "../bashintl.h"
+
+#include "../shell.h"
+#include "common.h"
+#include "bashgetopt.h"
+#include "trap.h"
+
+#include <shtty.h>
+
+#if defined (READLINE)
+#include "../bashline.h"
+#include <readline/readline.h>
+#endif
+
+#if defined (BUFFERED_INPUT)
+#  include "input.h"
+#endif
+
+#include "shmbutil.h"
+#include "timer.h"
+
+#if !defined(errno)
+extern int errno;
+#endif
+
+struct ttsave
+{
+  int fd;
+  TTYSTRUCT attrs;
+};
+
+#if defined (READLINE)
+static void reset_attempted_completion_function PARAMS((char *));
+static int set_itext PARAMS((void));
+static char *edit_line PARAMS((char *, char *));
+static void set_eol_delim PARAMS((int));
+static void reset_eol_delim PARAMS((char *));
+static void set_readline_timeout PARAMS((sh_timer *t, time_t, long));
+#endif
+static SHELL_VAR *bind_read_variable PARAMS((char *, char *, int));
+#if defined (HANDLE_MULTIBYTE)
+static int read_mbchar PARAMS((int, char *, int, int, int));
+#endif
+static void ttyrestore PARAMS((struct ttsave *));
+
+static sighandler sigalrm PARAMS((int));
+static void reset_timeout PARAMS((void));
+
+/* Try this to see what the rest of the shell can do with the information. */
+sh_timer *read_timeout;
+
+static int reading, tty_modified;
+static SigHandler *old_alrm;
+static unsigned char delim;
+
+static struct ttsave termsave;
+
+/* In all cases, SIGALRM just sets a flag that we check periodically.  This
+   avoids problems with the semi-tricky stuff we do with the xfree of
+   input_string at the top of the unwind-protect list (see below). */
+
+/* Set a flag that check_read_timeout can check.  This relies on zread or
+   read_builtin calling trap.c:check_signals() (which calls check_read_timeout()) */
+static sighandler
+sigalrm (s)
+     int s;
+{
+  /* Display warning if this is called without read_timeout set? */
+  if (read_timeout)
+    read_timeout->alrmflag = 1;
+}
+
+static void
+reset_timeout ()
+{
+  /* Cancel alarm before restoring signal handler. */
+  if (read_timeout)
+    shtimer_clear (read_timeout);
+#if defined (READLINE)
+  rl_clear_timeout ();
+#endif
+  read_timeout = 0;
+}
+
+void
+check_read_timeout ()
+{
+  if (read_timeout && shtimer_chktimeout (read_timeout))
+    sh_longjmp (read_timeout->jmpenv, 1);
+}
+
+int
+read_builtin_timeout (fd)
+     int fd;
+{
+  if ((read_timeout == 0) ||
+      (read_timeout->fd != fd) ||
+      (read_timeout->tmout.tv_sec == 0 && read_timeout->tmout.tv_usec == 0))
+    return 0;
+
+  return ((read_timeout->flags & SHTIMER_ALARM) ? shtimer_alrm (read_timeout)
+  						: shtimer_select (read_timeout));
+}
+
+/* Read the value of the shell variables whose names follow.
+   The reading is done from the current input stream, whatever
+   that may be.  Successive words of the input line are assigned
+   to the variables mentioned in LIST.  The last variable in LIST
+   gets the remainder of the words on the line.  If no variables
+   are mentioned in LIST, then the default variable is $REPLY. */
+int
+read_builtin (list)
+     WORD_LIST *list;
+{
+  register char *varname;
+  int size, nr, pass_next, saw_escape, eof, opt, retval, code, print_ps2, nflag;
+  volatile int i;
+  int input_is_tty, input_is_pipe, unbuffered_read, skip_ctlesc, skip_ctlnul;
+  int raw, edit, nchars, silent, have_timeout, ignore_delim, fd;
+  int lastsig, t_errno;
+  int mb_cur_max;
+  unsigned int tmsec, tmusec;
+  long ival, uval;
+  intmax_t intval;
+  char c;
+  char *input_string, *orig_input_string, *ifs_chars, *prompt, *arrayname;
+  char *e, *t, *t1, *ps2, *tofree;
+  struct stat tsb;
+  SHELL_VAR *var;
+  TTYSTRUCT ttattrs, ttset;
+  sigset_t chldset, prevset;
+#if defined (ARRAY_VARS)
+  WORD_LIST *alist;
+  int vflags;
+#endif
+  int bindflags;
+#if defined (READLINE)
+  char *rlbuf, *itext;
+  int rlind;
+  FILE *save_instream;
+#endif
+
+  USE_VAR(size);
+  USE_VAR(i);
+  USE_VAR(pass_next);
+  USE_VAR(print_ps2);
+  USE_VAR(saw_escape);
+  USE_VAR(input_is_pipe);
+/*  USE_VAR(raw); */
+  USE_VAR(edit);
+  USE_VAR(tmsec);
+  USE_VAR(tmusec);
+  USE_VAR(nchars);
+  USE_VAR(silent);
+  USE_VAR(ifs_chars);
+  USE_VAR(prompt);
+  USE_VAR(arrayname);
+#if defined (READLINE)
+  USE_VAR(rlbuf);
+  USE_VAR(rlind);
+  USE_VAR(itext);
+#endif
+  USE_VAR(list);
+  USE_VAR(ps2);
+  USE_VAR(lastsig);
+
+  reading = tty_modified = 0;
+  read_timeout = 0;
+
+  i = 0;		/* Index into the string that we are reading. */
+  raw = edit = 0;	/* Not reading raw input by default. */
+  silent = 0;
+  arrayname = prompt = (char *)NULL;
+  fd = 0;		/* file descriptor to read from */
+
+#if defined (READLINE)
+  rlbuf = itext = (char *)0;
+  rlind = 0;
+#endif
+
+  mb_cur_max = MB_CUR_MAX;
+  tmsec = tmusec = 0;		/* no timeout */
+  nr = nchars = input_is_tty = input_is_pipe = unbuffered_read = have_timeout = 0;
+  delim = '\n';		/* read until newline */
+  ignore_delim = nflag = 0;
+
+  reset_internal_getopt ();
+  while ((opt = internal_getopt (list, "ersa:d:i:n:p:t:u:N:")) != -1)
+    {
+      switch (opt)
+	{
+	case 'r':
+	  raw = 1;
+	  break;
+	case 'p':
+	  prompt = list_optarg;
+	  break;
+	case 's':
+	  silent = 1;
+	  break;
+	case 'e':
+#if defined (READLINE)
+	  edit = 1;
+#endif
+	  break;
+	case 'i':
+#if defined (READLINE)
+	  itext = list_optarg;
+#endif
+	  break;
+#if defined (ARRAY_VARS)
+	case 'a':
+	  arrayname = list_optarg;
+	  break;
+#endif
+	case 't':
+	  code = uconvert (list_optarg, &ival, &uval, (char **)NULL);
+	  if (code == 0 || ival < 0 || uval < 0)
+	    {
+	      builtin_error (_("%s: invalid timeout specification"), list_optarg);
+	      return (EXECUTION_FAILURE);
+	    }
+	  else
+	    {
+	      have_timeout = 1;
+	      tmsec = ival;
+	      tmusec = uval;
+	    }
+	  break;
+	case 'N':
+	  ignore_delim = 1;
+	  delim = -1;
+	case 'n':
+	  nflag = 1;
+	  code = legal_number (list_optarg, &intval);
+	  if (code == 0 || intval < 0 || intval != (int)intval)
+	    {
+	      sh_invalidnum (list_optarg);
+	      return (EXECUTION_FAILURE);
+	    }
+	  else
+	    nchars = intval;
+	  break;
+	case 'u':
+	  code = legal_number (list_optarg, &intval);
+	  if (code == 0 || intval < 0 || intval != (int)intval)
+	    {
+	      builtin_error (_("%s: invalid file descriptor specification"), list_optarg);
+	      return (EXECUTION_FAILURE);
+	    }
+	  else
+	    fd = intval;
+	  if (sh_validfd (fd) == 0)
+	    {
+	      builtin_error (_("%d: invalid file descriptor: %s"), fd, strerror (errno));
+	      return (EXECUTION_FAILURE);
+	    }
+	  break;
+	case 'd':
+	  delim = *list_optarg;
+	  break;
+	CASE_HELPOPT;
+	default:
+	  builtin_usage ();
+	  return (EX_USAGE);
+	}
+    }
+  list = loptend;
+
+  /* `read -t 0 var' tests whether input is available with select/FIONREAD,
+     and fails if those are unavailable */
+  if (have_timeout && tmsec == 0 && tmusec == 0)
+    return (input_avail (fd) ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
+
+  /* Convenience: check early whether or not the first of possibly several
+     variable names is a valid identifier, and bail early if so. */
+#if defined (ARRAY_VARS)
+  if (list)
+    SET_VFLAGS (list->word->flags, vflags, bindflags);
+  if (list && legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word, vflags) == 0)
+#else
+  bindflags = 0;
+  if (list && legal_identifier (list->word->word) == 0)
+#endif
+    {
+      sh_invalidid (list->word->word);
+      return (EXECUTION_FAILURE);
+    }
+
+  /* If we're asked to ignore the delimiter, make sure we do. */
+  if (ignore_delim)
+    delim = -1;
+
+  /* IF IFS is unset, we use the default of " \t\n". */
+  ifs_chars = getifs ();
+  if (ifs_chars == 0)		/* XXX - shouldn't happen */
+    ifs_chars = "";
+  /* If we want to read exactly NCHARS chars, don't split on IFS */
+  if (ignore_delim)
+    ifs_chars = "";
+  for (skip_ctlesc = skip_ctlnul = 0, e = ifs_chars; *e; e++)
+    skip_ctlesc |= *e == CTLESC, skip_ctlnul |= *e == CTLNUL;
+
+  input_string = (char *)xmalloc (size = 112);	/* XXX was 128 */
+  input_string[0] = '\0';
+
+  /* More input and options validation */
+  if (nflag == 1 && nchars == 0)
+    {
+      retval = read (fd, &c, 0);
+      retval = (retval >= 0) ? EXECUTION_SUCCESS : EXECUTION_FAILURE;
+      goto assign_vars;		/* bail early if asked to read 0 chars */
+    }
+
+  /* $TMOUT, if set, is the default timeout for read. */
+  if (have_timeout == 0 && (e = get_string_value ("TMOUT")))
+    {
+      code = uconvert (e, &ival, &uval, (char **)NULL);
+      if (code == 0 || ival < 0 || uval < 0)
+	tmsec = tmusec = 0;
+      else
+	{
+	  tmsec = ival;
+	  tmusec = uval;
+	}
+    }
+
+#if defined (SIGCHLD)
+  sigemptyset (&chldset);
+  sigprocmask (SIG_BLOCK, (sigset_t *)0, &chldset);
+  sigaddset (&chldset, SIGCHLD);
+#endif
+
+  begin_unwind_frame ("read_builtin");
+
+#if defined (BUFFERED_INPUT)
+  if (interactive == 0 && default_buffered_input >= 0 && fd_is_bash_input (fd))
+    sync_buffered_stream (default_buffered_input);
+#endif
+
+#if 1
+  input_is_tty = isatty (fd);
+#else
+  input_is_tty = 1;
+#endif
+  if (input_is_tty == 0)
+#ifndef __CYGWIN__
+    input_is_pipe = (lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE);
+#else
+    input_is_pipe = 1;
+#endif
+
+  /* If the -p, -e or -s flags were given, but input is not coming from the
+     terminal, turn them off. */
+  if ((prompt || edit || silent) && input_is_tty == 0)
+    {
+      prompt = (char *)NULL;
+#if defined (READLINE)
+      itext = (char *)NULL;
+#endif
+      edit = silent = 0;
+    }
+
+#if defined (READLINE)
+  if (edit)
+    add_unwind_protect (xfree, rlbuf);
+#endif
+
+  pass_next = 0;	/* Non-zero signifies last char was backslash. */
+  saw_escape = 0;	/* Non-zero signifies that we saw an escape char */
+
+  if (tmsec > 0 || tmusec > 0)
+    {
+      /* Turn off the timeout if stdin is a regular file (e.g. from
+	 input redirection). */
+      if ((fstat (fd, &tsb) < 0) || S_ISREG (tsb.st_mode))
+	tmsec = tmusec = 0;
+    }
+
+  if (tmsec > 0 || tmusec > 0)
+    {
+      read_timeout = shtimer_alloc ();
+      read_timeout->flags = SHTIMER_LONGJMP;
+
+#if defined (HAVE_SELECT)
+      read_timeout->flags |= (edit || posixly_correct) ? SHTIMER_ALARM : SHTIMER_SELECT;
+#else
+      read_timeout->flags |= SHTIMER_ALARM;
+#endif
+      read_timeout->fd = fd;
+
+      read_timeout->alrm_handler = sigalrm;
+    }
+
+  if (tmsec > 0 || tmusec > 0)
+    {
+      code = setjmp_nosigs (read_timeout->jmpenv);
+      if (code)
+	{
+	  reset_timeout ();
+	  sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+
+	  /* Tricky.  The top of the unwind-protect stack is the free of
+	     input_string.  We want to run all the rest and use input_string,
+	     so we have to save input_string temporarily, run the unwind-
+	     protects, then restore input_string so we can use it later */
+	  orig_input_string = 0;
+	  input_string[i] = '\0';	/* make sure it's terminated */
+	  if (i == 0)
+	    {
+	      t = (char *)xmalloc (1);
+	      t[0] = 0;
+	    }
+	  else
+	    t = savestring (input_string);
+
+	  run_unwind_frame ("read_builtin");
+	  input_string = t;
+	  retval = 128+SIGALRM;
+	  goto assign_vars;
+	}
+      if (interactive_shell == 0)
+	initialize_terminating_signals ();
+      add_unwind_protect (reset_timeout, (char *)NULL);
+#if defined (READLINE)
+      if (edit)
+	{
+	  add_unwind_protect (reset_attempted_completion_function, (char *)NULL);
+	  add_unwind_protect (bashline_reset_event_hook, (char *)NULL);
+	  set_readline_timeout (read_timeout, tmsec, tmusec);
+	}
+      else
+#endif
+      shtimer_set (read_timeout, tmsec, tmusec);
+    }
+
+  /* If we've been asked to read only NCHARS chars, or we're using some
+     character other than newline to terminate the line, do the right
+     thing to readline or the tty. */
+  if (nchars > 0 || delim != '\n')
+    {
+#if defined (READLINE)
+      if (edit)
+	{
+	  if (nchars > 0)
+	    {
+	      unwind_protect_int (rl_num_chars_to_read);
+	      rl_num_chars_to_read = nchars;
+	    }
+	  if (delim != '\n')
+	    {
+	      set_eol_delim (delim);
+	      add_unwind_protect (reset_eol_delim, (char *)NULL);
+	    }
+	}
+      else
+#endif
+      if (input_is_tty)
+	{
+	  /* ttsave() */
+	  termsave.fd = fd;
+	  ttgetattr (fd, &ttattrs);
+	  termsave.attrs = ttattrs;
+
+	  ttset = ttattrs;	  
+	  i = silent ? ttfd_cbreak (fd, &ttset) : ttfd_onechar (fd, &ttset);
+	  if (i < 0)
+	    sh_ttyerror (1);
+	  tty_modified = 1;
+	  add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
+	  if (interactive_shell == 0)
+	    initialize_terminating_signals ();
+	}
+    }
+  else if (silent)	/* turn off echo but leave term in canonical mode */
+    {
+      /* ttsave (); */
+      termsave.fd = fd;
+      ttgetattr (fd, &ttattrs);
+      termsave.attrs = ttattrs;
+
+      ttset = ttattrs;
+      i = ttfd_noecho (fd, &ttset);			/* ttnoecho (); */
+      if (i < 0)
+	sh_ttyerror (1);
+
+      tty_modified = 1;
+      add_unwind_protect ((Function *)ttyrestore, (char *)&termsave);
+      if (interactive_shell == 0)
+	initialize_terminating_signals ();
+    }
+
+#if defined (READLINE)
+  save_instream = 0;
+  if (edit && fd != 0)
+    {
+      if (bash_readline_initialized == 0)
+	initialize_readline ();
+
+      unwind_protect_var (rl_instream);
+      save_instream = rl_instream;
+      rl_instream = fdopen (fd, "r");	
+    }
+#endif
+
+  /* This *must* be the top unwind-protect on the stack, so the manipulation
+     of the unwind-protect stack after the realloc() works right. */
+  add_unwind_protect (xfree, input_string);
+
+  check_read_timeout ();
+  /* These only matter if edit == 0 */
+  if ((nchars > 0) && (input_is_tty == 0) && ignore_delim)	/* read -N */
+    unbuffered_read = 2;
+#if 0
+  else if ((nchars > 0) || (delim != '\n') || input_is_pipe)
+#else
+  else if (((nchars > 0 || delim != '\n') && input_is_tty) || input_is_pipe)
+    unbuffered_read = 1;
+#endif
+  if (prompt && edit == 0)
+    {
+      fprintf (stderr, "%s", prompt);
+      fflush (stderr);
+    }
+
+#if defined (__CYGWIN__) && defined (O_TEXT)
+  setmode (0, O_TEXT);
+#endif
+
+  ps2 = 0;
+  for (print_ps2 = eof = retval = 0;;)
+    {
+      check_read_timeout ();
+
+#if defined (READLINE)
+      if (edit)
+	{
+	  /* If we have a null delimiter, don't treat NULL as ending the line */
+	  if (rlbuf && rlbuf[rlind] == '\0' && delim != '\0')
+	    {
+	      free (rlbuf);
+	      rlbuf = (char *)0;
+	    }
+#if defined (SIGCHLD)
+	  if (tmsec > 0 || tmusec > 0)
+	    sigprocmask (SIG_SETMASK, &chldset, &prevset);
+#endif
+	  if (rlbuf == 0)
+	    {
+	      reading = 1;
+	      rlbuf = edit_line (prompt ? prompt : "", itext);
+	      reading = 0;
+	      rlind = 0;
+	    }
+#if defined (SIGCHLD)
+	  if (tmsec > 0 || tmusec > 0)
+	    sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+#endif
+	  if (rlbuf == 0)
+	    {
+	      eof = 1;
+	      break;
+	    }
+	  c = rlbuf[rlind++];
+	}
+      else
+	{
+#endif
+
+      if (print_ps2)
+	{
+	  if (ps2 == 0)
+	    ps2 = get_string_value ("PS2");
+	  fprintf (stderr, "%s", ps2 ? ps2 : "");
+	  fflush (stderr);
+	  print_ps2 = 0;
+	}
+
+      reading = 1;
+      check_read_timeout ();
+      errno = 0;
+
+#if defined (SIGCHLD)
+      if (tmsec > 0 || tmusec > 0)
+	sigprocmask (SIG_SETMASK, &chldset, &prevset);
+#endif
+      if (unbuffered_read == 2)
+	retval = posixly_correct ? zreadintr (fd, &c, 1) : zreadn (fd, &c, nchars - nr);
+      else if (unbuffered_read)
+	retval = posixly_correct ? zreadintr (fd, &c, 1) : zread (fd, &c, 1);
+      else
+	retval = posixly_correct ? zreadcintr (fd, &c) : zreadc (fd, &c);
+#if defined (SIGCHLD)
+      if (tmsec > 0 || tmusec > 0)
+	sigprocmask (SIG_SETMASK, &prevset, (sigset_t *)0);
+#endif
+
+      reading = 0;
+
+      if (retval <= 0)
+	{
+	  int t;
+
+	  t = errno;
+	  if (retval < 0 && errno == EINTR)
+	    {
+	      check_signals ();		/* in case we didn't call zread via zreadc */
+	      lastsig = LASTSIG();
+	      if (lastsig == 0)
+		lastsig = trapped_signal_received;
+#if 0
+	      run_pending_traps ();	/* because interrupt_immediately is not set */
+#endif
+	    }
+	  else
+	    lastsig = 0;
+	  if (terminating_signal && tty_modified)
+	    ttyrestore (&termsave);	/* fix terminal before exiting */
+	  CHECK_TERMSIG;
+	  eof = 1;
+	  errno = t;	/* preserve it for the error message below */
+	  break;
+	}
+
+      QUIT;		/* in case we didn't call check_signals() */
+#if defined (READLINE)
+	}
+#endif
+
+      if (retval <= 0)			/* XXX shouldn't happen */
+	check_read_timeout ();
+
+      /* XXX -- use i + mb_cur_max (at least 4) for multibyte/read_mbchar */
+      if (i + (mb_cur_max > 4 ? mb_cur_max : 4) >= size)
+	{
+	  char *t;
+	  t = (char *)xrealloc (input_string, size += 128);
+
+	  /* Only need to change unwind-protect if input_string changes */
+	  if (t != input_string)
+	    {
+	      input_string = t;
+	      remove_unwind_protect ();
+	      add_unwind_protect (xfree, input_string);
+	    }
+	}
+
+      /* If the next character is to be accepted verbatim, a backslash
+	 newline pair still disappears from the input. */
+      if (pass_next)
+	{
+	  pass_next = 0;
+	  if (c == '\n')
+	    {
+	      if (skip_ctlesc == 0 && i > 0)
+		i--;		/* back up over the CTLESC */
+	      if (interactive && input_is_tty && raw == 0)
+		print_ps2 = 1;
+	    }
+	  else
+	    goto add_char;
+	  continue;
+	}
+
+      /* This may cause problems if IFS contains CTLESC */
+      if (c == '\\' && raw == 0)
+	{
+	  pass_next++;
+	  if (skip_ctlesc == 0)
+	    {
+	      saw_escape++;
+	      input_string[i++] = CTLESC;
+	    }
+	  continue;
+	}
+
+      if (ignore_delim == 0 && (unsigned char)c == delim)
+	break;
+
+      if (c == '\0' && delim != '\0')
+	continue;		/* skip NUL bytes in input */
+
+      if ((skip_ctlesc == 0 && c == CTLESC) || (skip_ctlnul == 0 && c == CTLNUL))
+	{
+	  saw_escape++;
+	  input_string[i++] = CTLESC;
+	}
+
+add_char:
+      input_string[i++] = c;
+      check_read_timeout ();
+
+#if defined (HANDLE_MULTIBYTE)
+      /* XXX - what if C == 127? Can DEL introduce a multibyte sequence? */
+      if (mb_cur_max > 1 && is_basic (c) == 0)
+	{
+	  input_string[i] = '\0';	/* for simplicity and debugging */
+	  /* If we got input from readline, grab the next multibyte char from
+	     rlbuf. */
+#  if defined (READLINE)
+	  if (edit)
+	    {
+	      size_t clen;
+	      clen = mbrlen (rlbuf + rlind - 1, mb_cur_max, (mbstate_t *)NULL);
+	      /* We only deal with valid multibyte sequences longer than one
+		 byte. If we get anything else, we leave the one character
+		 copied and move on to the next. */
+	      if ((int)clen > 1)
+		{
+		  memcpy (input_string+i, rlbuf+rlind, clen-1);
+		  i += clen - 1;
+		  rlind += clen - 1;
+		}
+	    }
+	  else
+#  endif
+	  if (locale_utf8locale == 0 || ((c & 0x80) != 0))
+	    i += read_mbchar (fd, input_string, i, c, unbuffered_read);
+	}
+#endif
+
+      nr++;
+
+      if (nchars > 0 && nr >= nchars)
+	break;
+    }
+  input_string[i] = '\0';
+  check_read_timeout ();
+
+#if defined (READLINE)
+  if (edit)
+    free (rlbuf);
+#endif
+
+  if (retval < 0)
+    {
+      t_errno = errno;
+      if (errno != EINTR)
+	builtin_error (_("read error: %d: %s"), fd, strerror (errno));
+      run_unwind_frame ("read_builtin");
+      return ((t_errno != EINTR) ? EXECUTION_FAILURE : 128+lastsig);
+    }
+
+  if (tmsec > 0 || tmusec > 0)
+    reset_timeout ();
+
+  if (nchars > 0 || delim != '\n')
+    {
+#if defined (READLINE)
+      if (edit)
+	{
+	  if (nchars > 0)
+	    rl_num_chars_to_read = 0;
+	  if (delim != '\n')
+	    reset_eol_delim ((char *)NULL);
+	}
+      else
+#endif
+      if (input_is_tty)
+	ttyrestore (&termsave);
+    }
+  else if (silent)
+    ttyrestore (&termsave);
+
+  if (unbuffered_read == 0)
+    zsyncfd (fd);
+
+#if defined (READLINE)
+  if (save_instream)
+    rl_instream = save_instream;	/* can't portably free it */
+#endif
+
+  discard_unwind_frame ("read_builtin");
+
+  retval = eof ? EXECUTION_FAILURE : EXECUTION_SUCCESS;
+
+assign_vars:
+
+#if defined (ARRAY_VARS)
+  /* If -a was given, take the string read, break it into a list of words,
+     an assign them to `arrayname' in turn. */
+  if (arrayname)
+    {
+      /* pass 1 for flags arg to clear the existing array + 2 to check for a
+	 valid identifier. */
+      var = builtin_find_indexed_array (arrayname, 3);
+      if (var == 0)
+	{
+	  free (input_string);
+	  return EXECUTION_FAILURE;	/* readonly or noassign */
+	}
+
+      alist = list_string (input_string, ifs_chars, 0);
+      if (alist)
+	{
+	  if (saw_escape)
+	    dequote_list (alist);
+	  else
+	    word_list_remove_quoted_nulls (alist);
+	  assign_array_var_from_word_list (var, alist, 0);
+	  dispose_words (alist);
+	}
+      free (input_string);
+      return (retval);
+    }
+#endif /* ARRAY_VARS */ 
+
+  /* If there are no variables, save the text of the line read to the
+     variable $REPLY.  ksh93 strips leading and trailing IFS whitespace,
+     so that `read x ; echo "$x"' and `read ; echo "$REPLY"' behave the
+     same way, but I believe that the difference in behaviors is useful
+     enough to not do it.  Without the bash behavior, there is no way
+     to read a line completely without interpretation or modification
+     unless you mess with $IFS (e.g., setting it to the empty string).
+     If you disagree, change the occurrences of `#if 0' to `#if 1' below. */
+  if (list == 0)
+    {
+#if 0
+      orig_input_string = input_string;
+      for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++)
+	;
+      input_string = t;
+      input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape);
+#endif
+
+      if (saw_escape)
+	{
+	  t = dequote_string (input_string);
+	  var = bind_variable ("REPLY", t, 0);
+	  free (t);
+	}
+      else
+	var = bind_variable ("REPLY", input_string, 0);
+      if (var == 0 || readonly_p (var) || noassign_p (var))
+	retval = EXECUTION_FAILURE;
+      else
+	VUNSETATTR (var, att_invisible);
+
+      free (input_string);
+      return (retval);
+    }
+
+  /* This code implements the Posix.2 spec for splitting the words
+     read and assigning them to variables. */
+  orig_input_string = input_string;
+
+  /* Remove IFS white space at the beginning of the input string.  If
+     $IFS is null, no field splitting is performed. */
+  for (t = input_string; ifs_chars && *ifs_chars && spctabnl(*t) && isifs(*t); t++)
+    ;
+  input_string = t;
+  for (; list->next; list = list->next)
+    {
+      varname = list->word->word;
+#if defined (ARRAY_VARS)
+      SET_VFLAGS (list->word->flags, vflags, bindflags);
+      if (legal_identifier (varname) == 0 && valid_array_reference (varname, vflags) == 0)
+#else
+      if (legal_identifier (varname) == 0)
+#endif
+	{
+	  sh_invalidid (varname);
+	  free (orig_input_string);
+	  return (EXECUTION_FAILURE);
+	}
+
+      /* If there are more variables than words read from the input,
+	 the remaining variables are set to the empty string. */
+      if (*input_string)
+	{
+	  /* This call updates INPUT_STRING. */
+	  t = get_word_from_string (&input_string, ifs_chars, &e);
+	  if (t)
+	    *e = '\0';
+	  /* Don't bother to remove the CTLESC unless we added one
+	     somewhere while reading the string. */
+	  if (t && saw_escape)
+	    {
+	      t1 = dequote_string (t);
+	      var = bind_read_variable (varname, t1, bindflags);
+	      free (t1);
+	    }
+	  else
+	    var = bind_read_variable (varname, t ? t : "", bindflags);
+	}
+      else
+	{
+	  t = (char *)0;
+	  var = bind_read_variable (varname, "", bindflags);
+	}
+
+      FREE (t);
+      if (var == 0)
+	{
+	  free (orig_input_string);
+	  return (EXECUTION_FAILURE);
+	}
+
+      stupidly_hack_special_variables (varname);
+      VUNSETATTR (var, att_invisible);
+    }
+
+  /* Now assign the rest of the line to the last variable argument. */
+#if defined (ARRAY_VARS)
+  SET_VFLAGS (list->word->flags, vflags, bindflags);
+  if (legal_identifier (list->word->word) == 0 && valid_array_reference (list->word->word, vflags) == 0)
+#else
+  if (legal_identifier (list->word->word) == 0)
+#endif
+    {
+      sh_invalidid (list->word->word);
+      free (orig_input_string);
+      return (EXECUTION_FAILURE);
+    }
+
+#if 0
+  /* This has to be done this way rather than using string_list
+     and list_string because Posix.2 says that the last variable gets the
+     remaining words and their intervening separators. */
+  input_string = strip_trailing_ifs_whitespace (input_string, ifs_chars, saw_escape);
+#else
+  /* Check whether or not the number of fields is exactly the same as the
+     number of variables. */
+  tofree = NULL;
+  if (*input_string)
+    {
+      t1 = input_string;
+      t = get_word_from_string (&input_string, ifs_chars, &e);
+      if (*input_string == 0)
+	tofree = input_string = t;
+      else
+	{
+	  input_string = strip_trailing_ifs_whitespace (t1, ifs_chars, saw_escape);
+	  tofree = t;
+	}
+    }
+#endif
+
+  if (saw_escape && input_string && *input_string)
+    {
+      t = dequote_string (input_string);
+      var = bind_read_variable (list->word->word, t, bindflags);
+      free (t);
+    }
+  else
+    var = bind_read_variable (list->word->word, input_string ? input_string : "", bindflags);
+
+  if (var)
+    {
+      stupidly_hack_special_variables (list->word->word);
+      VUNSETATTR (var, att_invisible);
+    }
+  else
+    retval = EXECUTION_FAILURE;
+
+  FREE (tofree);
+  free (orig_input_string);
+
+  return (retval);
+}
+
+static SHELL_VAR *
+bind_read_variable (name, value, flags)
+     char *name, *value;
+     int flags;
+{
+  SHELL_VAR *v;
+
+  v = builtin_bind_variable (name, value, flags);
+  return (v == 0 ? v
+		 : ((readonly_p (v) || noassign_p (v)) ? (SHELL_VAR *)NULL : v));
+}
+
+#if defined (HANDLE_MULTIBYTE)
+static int
+read_mbchar (fd, string, ind, ch, unbuffered)
+     int fd;
+     char *string;
+     int ind, ch, unbuffered;
+{
+  char mbchar[MB_LEN_MAX + 1];
+  int i, n, r;
+  char c;
+  size_t ret;
+  mbstate_t ps, ps_back;
+  wchar_t wc;
+
+  memset (&ps, '\0', sizeof (mbstate_t));
+  memset (&ps_back, '\0', sizeof (mbstate_t));
+  
+  mbchar[0] = ch;
+  i = 1;
+  for (n = 0; n <= MB_LEN_MAX; n++)
+    {
+      ps_back = ps;
+      ret = mbrtowc (&wc, mbchar, i, &ps);
+      if (ret == (size_t)-2)
+	{
+	  ps = ps_back;
+
+	  /* We don't want to be interrupted during a multibyte char read */
+	  if (unbuffered == 2)
+	    r = zreadn (fd, &c, 1);
+	  else if (unbuffered)
+	    r = zread (fd, &c, 1);
+	  else
+	    r = zreadc (fd, &c);
+	  if (r <= 0)
+	    goto mbchar_return;
+	  mbchar[i++] = c;	
+	  continue;
+	}
+      else if (ret == (size_t)-1 || ret == (size_t)0 || ret > (size_t)0)
+	break;
+    }
+
+mbchar_return:
+  if (i > 1)	/* read a multibyte char */
+    /* mbchar[0] is already string[ind-1] */
+    for (r = 1; r < i; r++)
+      string[ind+r-1] = mbchar[r];
+  return i - 1;
+}
+#endif
+
+
+static void
+ttyrestore (ttp)
+     struct ttsave *ttp;
+{
+  ttsetattr (ttp->fd, &(ttp->attrs));
+  tty_modified = 0;
+}
+
+void
+read_tty_cleanup ()
+{
+  if (tty_modified)
+    ttyrestore (&termsave);
+}
+
+int
+read_tty_modified ()
+{
+  return (tty_modified);
+}
+
+#if defined (READLINE)
+static rl_completion_func_t *old_attempted_completion_function = 0;
+static rl_hook_func_t *old_startup_hook;
+static char *deftext;
+
+static void
+reset_attempted_completion_function (cp)
+     char *cp;
+{
+  if (rl_attempted_completion_function == 0 && old_attempted_completion_function)
+    rl_attempted_completion_function = old_attempted_completion_function;
+}
+
+static int
+set_itext ()
+{
+  int r1, r2;
+
+  r1 = r2 = 0;
+  if (old_startup_hook)
+    r1 = (*old_startup_hook) ();
+  if (deftext)
+    {
+      r2 = rl_insert_text (deftext);
+      deftext = (char *)NULL;
+      rl_startup_hook = old_startup_hook;
+      old_startup_hook = (rl_hook_func_t *)NULL;
+    }
+  return (r1 || r2);
+}
+
+static char *
+edit_line (p, itext)
+     char *p;
+     char *itext;
+{
+  char *ret;
+  int len;
+
+  if (bash_readline_initialized == 0)
+    initialize_readline ();
+
+  old_attempted_completion_function = rl_attempted_completion_function;
+  rl_attempted_completion_function = (rl_completion_func_t *)NULL;
+  bashline_set_event_hook ();
+  if (itext)
+    {
+      old_startup_hook = rl_startup_hook;
+      rl_startup_hook = set_itext;
+      deftext = itext;
+    }
+
+  ret = readline (p);
+
+  rl_attempted_completion_function = old_attempted_completion_function;
+  old_attempted_completion_function = (rl_completion_func_t *)NULL;
+  bashline_reset_event_hook ();
+
+  if (ret == 0)
+    {
+      if (RL_ISSTATE (RL_STATE_TIMEOUT))
+	{
+	  sigalrm (SIGALRM);		/* simulate receiving SIGALRM */
+	  check_read_timeout ();
+	}
+      return ret;
+    }
+
+  len = strlen (ret);
+  ret = (char *)xrealloc (ret, len + 2);
+  ret[len++] = delim;
+  ret[len] = '\0';
+  return ret;
+}
+
+static void
+set_readline_timeout (t, sec, usec)
+     sh_timer *t;
+     time_t sec;
+     long usec;
+{
+  t->tmout.tv_sec = sec;
+  t->tmout.tv_usec = usec;
+  rl_set_timeout (sec, usec);
+}
+
+static int old_delim_ctype;
+static rl_command_func_t *old_delim_func;
+static int old_newline_ctype;
+static rl_command_func_t *old_newline_func;
+
+static unsigned char delim_char;
+
+static void
+set_eol_delim (c)
+     int c;
+{
+  Keymap cmap;
+
+  if (bash_readline_initialized == 0)
+    initialize_readline ();
+  cmap = rl_get_keymap ();
+
+  /* Save the old delimiter char binding */
+  old_newline_ctype = cmap[RETURN].type;
+  old_newline_func =  cmap[RETURN].function;
+  old_delim_ctype = cmap[c].type;
+  old_delim_func = cmap[c].function;
+
+  /* Change newline to self-insert */
+  cmap[RETURN].type = ISFUNC;
+  cmap[RETURN].function = rl_insert;
+
+  /* Bind the delimiter character to accept-line. */
+  cmap[c].type = ISFUNC;
+  cmap[c].function = rl_newline;
+
+  delim_char = c;
+}
+
+static void
+reset_eol_delim (cp)
+     char *cp;
+{
+  Keymap cmap;
+
+  cmap = rl_get_keymap ();
+
+  cmap[RETURN].type = old_newline_ctype;
+  cmap[RETURN].function = old_newline_func;
+
+  cmap[delim_char].type = old_delim_ctype;
+  cmap[delim_char].function = old_delim_func;
+}
+#endif