Adding upstream version 7.0.upstream/7.0upstream

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

1 files changed, 806 insertions, 0 deletions

diff --git a/isearch.c b/isearch.c
new file mode 100644
index 0000000..819fcbc
--- /dev/null
+++ b/isearch.c
@@ -0,0 +1,806 @@
+/* isearch.c - incremental searching */
+
+/* **************************************************************** */
+/*								    */
+/*			I-Search and Searching			    */
+/*								    */
+/* **************************************************************** */
+
+/* Copyright (C) 1987-2015 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 (HAVE_CONFIG_H)
+#  include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#include <stdio.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#if defined (HAVE_STDLIB_H)
+#  include <stdlib.h>
+#else
+#  include "ansi_stdlib.h"
+#endif
+
+#include "rldefs.h"
+#include "rlmbutil.h"
+
+#include "readline.h"
+#include "history.h"
+
+#include "rlprivate.h"
+#include "xmalloc.h"
+
+/* Variables exported to other files in the readline library. */
+char *_rl_isearch_terminators = (char *)NULL;
+
+_rl_search_cxt *_rl_iscxt = 0;
+
+/* Variables imported from other files in the readline library. */
+extern HIST_ENTRY *_rl_saved_line_for_history;
+
+static int rl_search_history PARAMS((int, int));
+
+static _rl_search_cxt *_rl_isearch_init PARAMS((int));
+static void _rl_isearch_fini PARAMS((_rl_search_cxt *));
+
+/* Last line found by the current incremental search, so we don't `find'
+   identical lines many times in a row.  Now part of isearch context. */
+/* static char *prev_line_found; */
+
+/* Last search string and its length. */
+static char *last_isearch_string;
+static int last_isearch_string_len;
+
+static char * const default_isearch_terminators = "\033\012";
+
+_rl_search_cxt *
+_rl_scxt_alloc (type, flags)
+     int type, flags;
+{
+  _rl_search_cxt *cxt;
+
+  cxt = (_rl_search_cxt *)xmalloc (sizeof (_rl_search_cxt));
+
+  cxt->type = type;
+  cxt->sflags = flags;
+
+  cxt->search_string = 0;
+  cxt->search_string_size = cxt->search_string_index = 0;
+
+  cxt->lines = 0;
+  cxt->allocated_line = 0;
+  cxt->hlen = cxt->hindex = 0;
+
+  cxt->save_point = rl_point;
+  cxt->save_mark = rl_mark;
+  cxt->save_line = where_history ();
+  cxt->last_found_line = cxt->save_line;
+  cxt->prev_line_found = 0;
+
+  cxt->save_undo_list = 0;
+
+  cxt->keymap = _rl_keymap;
+  cxt->okeymap = _rl_keymap;
+
+  cxt->history_pos = 0;
+  cxt->direction = 0;
+
+  cxt->prevc = cxt->lastc = 0;
+
+  cxt->sline = 0;
+  cxt->sline_len = cxt->sline_index = 0;
+
+  cxt->search_terminators = 0;
+
+  return cxt;
+}
+
+void
+_rl_scxt_dispose (cxt, flags)
+     _rl_search_cxt *cxt;
+     int flags;
+{
+  FREE (cxt->search_string);
+  FREE (cxt->allocated_line);
+  FREE (cxt->lines);
+
+  xfree (cxt);
+}
+
+/* Search backwards through the history looking for a string which is typed
+   interactively.  Start with the current line. */
+int
+rl_reverse_search_history (sign, key)
+     int sign, key;
+{
+  return (rl_search_history (-sign, key));
+}
+
+/* Search forwards through the history looking for a string which is typed
+   interactively.  Start with the current line. */
+int
+rl_forward_search_history (sign, key)
+     int sign, key;
+{
+  return (rl_search_history (sign, key));
+}
+
+/* Display the current state of the search in the echo-area.
+   SEARCH_STRING contains the string that is being searched for,
+   DIRECTION is zero for forward, or non-zero for reverse,
+   WHERE is the history list number of the current line.  If it is
+   -1, then this line is the starting one. */
+static void
+rl_display_search (search_string, flags, where)
+     char *search_string;
+     int flags, where;
+{
+  char *message;
+  int msglen, searchlen;
+
+  searchlen = (search_string && *search_string) ? strlen (search_string) : 0;
+
+  message = (char *)xmalloc (searchlen + 64);
+  msglen = 0;
+
+#if defined (NOTDEF)
+  if (where != -1)
+    {
+      sprintf (message, "[%d]", where + history_base);
+      msglen = strlen (message);
+    }
+#endif /* NOTDEF */
+
+  message[msglen++] = '(';
+
+  if (flags & SF_FAILED)
+    {
+      strcpy (message + msglen, "failed ");
+      msglen += 7;
+    }
+
+  if (flags & SF_REVERSE)
+    {
+      strcpy (message + msglen, "reverse-");
+      msglen += 8;
+    }
+
+  strcpy (message + msglen, "i-search)`");
+  msglen += 10;
+
+  if (search_string)
+    {
+      strcpy (message + msglen, search_string);
+      msglen += searchlen;
+    }
+
+  strcpy (message + msglen, "': ");
+
+  rl_message ("%s", message);
+  xfree (message);
+  (*rl_redisplay_function) ();
+}
+
+static _rl_search_cxt *
+_rl_isearch_init (direction)
+     int direction;
+{
+  _rl_search_cxt *cxt;
+  register int i;
+  HIST_ENTRY **hlist;
+
+  cxt = _rl_scxt_alloc (RL_SEARCH_ISEARCH, 0);
+  if (direction < 0)
+    cxt->sflags |= SF_REVERSE;
+
+  cxt->search_terminators = _rl_isearch_terminators ? _rl_isearch_terminators
+						: default_isearch_terminators;
+
+  /* Create an array of pointers to the lines that we want to search. */
+  hlist = history_list ();
+  rl_maybe_replace_line ();
+  i = 0;
+  if (hlist)
+    for (i = 0; hlist[i]; i++);
+
+  /* Allocate space for this many lines, +1 for the current input line,
+     and remember those lines. */
+  cxt->lines = (char **)xmalloc ((1 + (cxt->hlen = i)) * sizeof (char *));
+  for (i = 0; i < cxt->hlen; i++)
+    cxt->lines[i] = hlist[i]->line;
+
+  if (_rl_saved_line_for_history)
+    cxt->lines[i] = _rl_saved_line_for_history->line;
+  else
+    {
+      /* Keep track of this so we can free it. */
+      cxt->allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));
+      strcpy (cxt->allocated_line, &rl_line_buffer[0]);
+      cxt->lines[i] = cxt->allocated_line;
+    }
+
+  cxt->hlen++;
+
+  /* The line where we start the search. */
+  cxt->history_pos = cxt->save_line;
+
+  rl_save_prompt ();
+
+  /* Initialize search parameters. */
+  cxt->search_string = (char *)xmalloc (cxt->search_string_size = 128);
+  cxt->search_string[cxt->search_string_index = 0] = '\0';
+
+  /* Normalize DIRECTION into 1 or -1. */
+  cxt->direction = (direction >= 0) ? 1 : -1;
+
+  cxt->sline = rl_line_buffer;
+  cxt->sline_len = strlen (cxt->sline);
+  cxt->sline_index = rl_point;
+
+  _rl_iscxt = cxt;		/* save globally */
+
+  return cxt;
+}
+
+static void
+_rl_isearch_fini (cxt)
+     _rl_search_cxt *cxt;
+{
+  /* First put back the original state. */
+  strcpy (rl_line_buffer, cxt->lines[cxt->save_line]);
+
+  rl_restore_prompt ();
+
+  /* Save the search string for possible later use. */
+  FREE (last_isearch_string);
+  last_isearch_string = cxt->search_string;
+  last_isearch_string_len = cxt->search_string_index;
+  cxt->search_string = 0;
+
+  if (cxt->last_found_line < cxt->save_line)
+    rl_get_previous_history (cxt->save_line - cxt->last_found_line, 0);
+  else
+    rl_get_next_history (cxt->last_found_line - cxt->save_line, 0);
+
+  /* If the string was not found, put point at the end of the last matching
+     line.  If last_found_line == orig_line, we didn't find any matching
+     history lines at all, so put point back in its original position. */
+  if (cxt->sline_index < 0)
+    {
+      if (cxt->last_found_line == cxt->save_line)
+	cxt->sline_index = cxt->save_point;
+      else
+	cxt->sline_index = strlen (rl_line_buffer);
+      rl_mark = cxt->save_mark;
+    }
+
+  rl_point = cxt->sline_index;
+  /* Don't worry about where to put the mark here; rl_get_previous_history
+     and rl_get_next_history take care of it. */
+
+  rl_clear_message ();
+}
+
+int
+_rl_search_getchar (cxt)
+     _rl_search_cxt *cxt;
+{
+  int c;
+
+  /* Read a key and decide how to proceed. */
+  RL_SETSTATE(RL_STATE_MOREINPUT);
+  c = cxt->lastc = rl_read_key ();
+  RL_UNSETSTATE(RL_STATE_MOREINPUT);
+
+#if defined (HANDLE_MULTIBYTE)
+  /* This ends up with C (and LASTC) being set to the last byte of the
+     multibyte character.  In most cases c == lastc == mb[0] */
+  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+    c = cxt->lastc = _rl_read_mbstring (cxt->lastc, cxt->mb, MB_LEN_MAX);
+#endif
+
+  RL_CHECK_SIGNALS ();
+  return c;
+}
+
+#define ENDSRCH_CHAR(c) \
+  ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G')))
+
+/* Process just-read character C according to isearch context CXT.  Return
+   -1 if the caller should just free the context and return, 0 if we should
+   break out of the loop, and 1 if we should continue to read characters. */
+int
+_rl_isearch_dispatch (cxt, c)
+     _rl_search_cxt *cxt;
+     int c;
+{
+  int n, wstart, wlen, limit, cval;
+  rl_command_func_t *f;
+
+  f = (rl_command_func_t *)NULL;
+
+  if (c < 0)
+    {
+      cxt->sflags |= SF_FAILED;
+      cxt->history_pos = cxt->last_found_line;
+      return -1;
+    }
+
+  /* If we are moving into a new keymap, modify cxt->keymap and go on.
+     This can be a problem if c == ESC and we want to terminate the
+     incremental search, so we check */
+  if (c >= 0 && cxt->keymap[c].type == ISKMAP && strchr (cxt->search_terminators, cxt->lastc) == 0)
+    {
+      /* _rl_keyseq_timeout specified in milliseconds; _rl_input_queued
+	 takes microseconds, so multiply by 1000.  If we don't get any
+	 additional input and this keymap shadows another function, process
+	 that key as if it was all we read. */
+      if (_rl_keyseq_timeout > 0 &&
+	    RL_ISSTATE (RL_STATE_CALLBACK) == 0 &&
+	    RL_ISSTATE (RL_STATE_INPUTPENDING) == 0 &&
+	    _rl_pushed_input_available () == 0 &&
+	    ((Keymap)(cxt->keymap[c].function))[ANYOTHERKEY].function &&
+	    _rl_input_queued (_rl_keyseq_timeout*1000) == 0)
+	goto add_character;
+
+      cxt->okeymap = cxt->keymap;
+      cxt->keymap = FUNCTION_TO_KEYMAP (cxt->keymap, c);
+      cxt->sflags |= SF_CHGKMAP;
+      /* XXX - we should probably save this sequence, so we can do
+	 something useful if this doesn't end up mapping to a command we
+	 interpret here.  Right now we just save the most recent character
+	 that caused the index into a new keymap. */
+      cxt->prevc = c;
+#if defined (HANDLE_MULTIBYTE)
+      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+	{
+	  if (cxt->mb[1] == 0)
+	    {
+	      cxt->pmb[0] = c;		/* XXX should be == cxt->mb[0] */
+	      cxt->pmb[1] = '\0';
+	    }
+	  else
+	    memcpy (cxt->pmb, cxt->mb, sizeof (cxt->pmb));
+	}
+#endif
+      return 1;
+    }
+
+add_character:
+
+  /* Translate the keys we do something with to opcodes. */
+  if (c >= 0 && cxt->keymap[c].type == ISFUNC)
+    {
+      f = cxt->keymap[c].function;
+
+      if (f == rl_reverse_search_history)
+	cxt->lastc = (cxt->sflags & SF_REVERSE) ? -1 : -2;
+      else if (f == rl_forward_search_history)
+	cxt->lastc = (cxt->sflags & SF_REVERSE) ? -2 : -1;
+      else if (f == rl_rubout)
+	cxt->lastc = -3;
+      else if (c == CTRL ('G') || f == rl_abort)
+	cxt->lastc = -4;
+      else if (c == CTRL ('W') || f == rl_unix_word_rubout)	/* XXX */
+	cxt->lastc = -5;
+      else if (c == CTRL ('Y') || f == rl_yank)	/* XXX */
+	cxt->lastc = -6;
+    }
+
+  /* If we changed the keymap earlier while translating a key sequence into
+     a command, restore it now that we've succeeded. */
+  if (cxt->sflags & SF_CHGKMAP)
+    {
+      cxt->keymap = cxt->okeymap;
+      cxt->sflags &= ~SF_CHGKMAP;
+      /* If we indexed into a new keymap, but didn't map to a command that
+	 affects the search (lastc > 0), and the character that mapped to a
+	 new keymap would have ended the search (ENDSRCH_CHAR(cxt->prevc)),
+	 handle that now as if the previous char would have ended the search
+	 and we would have read the current character. */
+      /* XXX - should we check cxt->mb? */
+      if (cxt->lastc > 0 && ENDSRCH_CHAR (cxt->prevc))
+	{
+	  rl_stuff_char (cxt->lastc);
+	  rl_execute_next (cxt->prevc);
+	  /* XXX - do we insert everything in cxt->pmb? */
+	  return (0);
+	}
+      /* Otherwise, if the current character is mapped to self-insert or
+	 nothing (i.e., not an editing command), and the previous character
+	 was a keymap index, then we need to insert both the previous
+	 character and the current character into the search string. */
+      else if (cxt->lastc > 0 && cxt->prevc > 0 &&
+	       cxt->keymap[cxt->prevc].type == ISKMAP &&
+	       (f == 0 || f == rl_insert))
+	{
+	  /* Make lastc be the next character read */
+	  /* XXX - do we insert everything in cxt->mb? */
+	  rl_execute_next (cxt->lastc);
+	  /* Dispatch on the previous character (insert into search string) */
+	  cxt->lastc = cxt->prevc;
+#if defined (HANDLE_MULTIBYTE)
+	  /* Have to overwrite cxt->mb here because dispatch uses it below */
+	  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+	    {  
+	      if (cxt->pmb[1] == 0)	  
+		{
+		  cxt->mb[0] = cxt->lastc;	/* == cxt->prevc */
+		  cxt->mb[1] = '\0';
+		}
+	      else
+		memcpy (cxt->mb, cxt->pmb, sizeof (cxt->mb));
+	    }
+#endif
+	  cxt->prevc = 0;	  
+	}
+      else if (cxt->lastc > 0 && cxt->prevc > 0 && f && f != rl_insert)
+	{
+	  rl_stuff_char (cxt->lastc);
+	  rl_execute_next (cxt->prevc);
+	  /* XXX - do we insert everything in cxt->pmb? */
+	  return (0);
+	}
+    }
+
+  /* The characters in isearch_terminators (set from the user-settable
+     variable isearch-terminators) are used to terminate the search but
+     not subsequently execute the character as a command.  The default
+     value is "\033\012" (ESC and C-J). */
+  if (cxt->lastc > 0 && strchr (cxt->search_terminators, cxt->lastc))
+    {
+      /* ESC still terminates the search, but if there is pending
+	 input or if input arrives within 0.1 seconds (on systems
+	 with select(2)) it is used as a prefix character
+	 with rl_execute_next.  WATCH OUT FOR THIS!  This is intended
+	 to allow the arrow keys to be used like ^F and ^B are used
+	 to terminate the search and execute the movement command.
+	 XXX - since _rl_input_available depends on the application-
+	 settable keyboard timeout value, this could alternatively
+	 use _rl_input_queued(100000) */
+      if (cxt->lastc == ESC && (_rl_pushed_input_available () || _rl_input_available ()))
+	rl_execute_next (ESC);
+      return (0);
+    }
+
+#if defined (HANDLE_MULTIBYTE)
+  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+    {
+      if (cxt->lastc >= 0 && (cxt->mb[0] && cxt->mb[1] == '\0') && ENDSRCH_CHAR (cxt->lastc))
+	{
+	  /* This sets rl_pending_input to LASTC; it will be picked up the next
+	     time rl_read_key is called. */
+	  rl_execute_next (cxt->lastc);
+	  return (0);
+	}
+    }
+  else
+#endif
+    if (cxt->lastc >= 0 && ENDSRCH_CHAR (cxt->lastc))
+      {
+	/* This sets rl_pending_input to LASTC; it will be picked up the next
+	   time rl_read_key is called. */
+	rl_execute_next (cxt->lastc);
+	return (0);
+      }
+
+  /* Now dispatch on the character.  `Opcodes' affect the search string or
+     state.  Other characters are added to the string.  */
+  switch (cxt->lastc)
+    {
+    /* search again */
+    case -1:
+      if (cxt->search_string_index == 0)
+	{
+	  if (last_isearch_string)
+	    {
+	      cxt->search_string_size = 64 + last_isearch_string_len;
+	      cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
+	      strcpy (cxt->search_string, last_isearch_string);
+	      cxt->search_string_index = last_isearch_string_len;
+	      rl_display_search (cxt->search_string, cxt->sflags, -1);
+	      break;
+	    }
+	  return (1);
+	}
+      else if (cxt->sflags & SF_REVERSE)
+	cxt->sline_index--;
+      else if (cxt->sline_index != cxt->sline_len)
+	cxt->sline_index++;
+      else
+	rl_ding ();
+      break;
+
+    /* switch directions */
+    case -2:
+      cxt->direction = -cxt->direction;
+      if (cxt->direction < 0)
+	cxt->sflags |= SF_REVERSE;
+      else
+	cxt->sflags &= ~SF_REVERSE;
+      break;
+
+    /* delete character from search string. */
+    case -3:	/* C-H, DEL */
+      /* This is tricky.  To do this right, we need to keep a
+	 stack of search positions for the current search, with
+	 sentinels marking the beginning and end.  But this will
+	 do until we have a real isearch-undo. */
+      if (cxt->search_string_index == 0)
+	rl_ding ();
+      else if (MB_CUR_MAX == 1 || rl_byte_oriented)
+	cxt->search_string[--cxt->search_string_index] = '\0';
+      else
+	{
+	  wstart = _rl_find_prev_mbchar (cxt->search_string, cxt->search_string_index, MB_FIND_NONZERO);
+	  if (wstart >= 0)
+	    cxt->search_string[cxt->search_string_index = wstart] = '\0';
+	  else
+	    cxt->search_string[cxt->search_string_index = 0] = '\0';
+	}
+
+      if (cxt->search_string_index == 0)
+	rl_ding ();
+
+      break;
+
+    case -4:	/* C-G, abort */
+      rl_replace_line (cxt->lines[cxt->save_line], 0);
+      rl_point = cxt->save_point;
+      rl_mark = cxt->save_mark;
+      rl_restore_prompt();
+      rl_clear_message ();
+
+      return -1;
+
+    case -5:	/* C-W */
+      /* skip over portion of line we already matched and yank word */
+      wstart = rl_point + cxt->search_string_index;
+      if (wstart >= rl_end)
+	{
+	  rl_ding ();
+	  break;
+	}
+
+      /* if not in a word, move to one. */
+      cval = _rl_char_value (rl_line_buffer, wstart);
+      if (_rl_walphabetic (cval) == 0)
+	{
+	  rl_ding ();
+	  break;
+	}
+      n = MB_NEXTCHAR (rl_line_buffer, wstart, 1, MB_FIND_NONZERO);;
+      while (n < rl_end)
+	{
+	  cval = _rl_char_value (rl_line_buffer, n);
+	  if (_rl_walphabetic (cval) == 0)
+	    break;
+	  n = MB_NEXTCHAR (rl_line_buffer, n, 1, MB_FIND_NONZERO);;
+	}
+      wlen = n - wstart + 1;
+      if (cxt->search_string_index + wlen + 1 >= cxt->search_string_size)
+	{
+	  cxt->search_string_size += wlen + 1;
+	  cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
+	}
+      for (; wstart < n; wstart++)
+	cxt->search_string[cxt->search_string_index++] = rl_line_buffer[wstart];
+      cxt->search_string[cxt->search_string_index] = '\0';
+      break;
+
+    case -6:	/* C-Y */
+      /* skip over portion of line we already matched and yank rest */
+      wstart = rl_point + cxt->search_string_index;
+      if (wstart >= rl_end)
+	{
+	  rl_ding ();
+	  break;
+	}
+      n = rl_end - wstart + 1;
+      if (cxt->search_string_index + n + 1 >= cxt->search_string_size)
+	{
+	  cxt->search_string_size += n + 1;
+	  cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
+	}
+      for (n = wstart; n < rl_end; n++)
+	cxt->search_string[cxt->search_string_index++] = rl_line_buffer[n];
+      cxt->search_string[cxt->search_string_index] = '\0';
+      break;
+
+    /* Add character to search string and continue search. */
+    default:
+      if (cxt->search_string_index + 2 >= cxt->search_string_size)
+	{
+	  cxt->search_string_size += 128;
+	  cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
+	}
+#if defined (HANDLE_MULTIBYTE)
+      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+	{
+	  int j, l;
+
+	  if (cxt->mb[0] == 0 || cxt->mb[1] == 0)
+	    cxt->search_string[cxt->search_string_index++] = cxt->mb[0];
+	  else
+	    for (j = 0, l = RL_STRLEN (cxt->mb); j < l; )
+	      cxt->search_string[cxt->search_string_index++] = cxt->mb[j++];
+	}
+      else
+#endif
+	cxt->search_string[cxt->search_string_index++] = cxt->lastc;	/* XXX - was c instead of lastc */
+      cxt->search_string[cxt->search_string_index] = '\0';
+      break;
+    }
+
+  for (cxt->sflags &= ~(SF_FOUND|SF_FAILED);; )
+    {
+      if (cxt->search_string_index == 0)
+	{
+	  cxt->sflags |= SF_FAILED;
+	  break;
+	}
+
+      limit = cxt->sline_len - cxt->search_string_index + 1;
+
+      /* Search the current line. */
+      while ((cxt->sflags & SF_REVERSE) ? (cxt->sline_index >= 0) : (cxt->sline_index < limit))
+	{
+	  if (STREQN (cxt->search_string, cxt->sline + cxt->sline_index, cxt->search_string_index))
+	    {
+	      cxt->sflags |= SF_FOUND;
+	      break;
+	    }
+	  else
+	    cxt->sline_index += cxt->direction;
+	}
+      if (cxt->sflags & SF_FOUND)
+	break;
+
+      /* Move to the next line, but skip new copies of the line
+	 we just found and lines shorter than the string we're
+	 searching for. */
+      do
+	{
+	  /* Move to the next line. */
+	  cxt->history_pos += cxt->direction;
+
+	  /* At limit for direction? */
+	  if ((cxt->sflags & SF_REVERSE) ? (cxt->history_pos < 0) : (cxt->history_pos == cxt->hlen))
+	    {
+	      cxt->sflags |= SF_FAILED;
+	      break;
+	    }
+
+	  /* We will need these later. */
+	  cxt->sline = cxt->lines[cxt->history_pos];
+	  cxt->sline_len = strlen (cxt->sline);
+	}
+      while ((cxt->prev_line_found && STREQ (cxt->prev_line_found, cxt->lines[cxt->history_pos])) ||
+	     (cxt->search_string_index > cxt->sline_len));
+
+      if (cxt->sflags & SF_FAILED)
+	break;
+
+      /* Now set up the line for searching... */
+      cxt->sline_index = (cxt->sflags & SF_REVERSE) ? cxt->sline_len - cxt->search_string_index : 0;
+    }
+
+  if (cxt->sflags & SF_FAILED)
+    {
+      /* We cannot find the search string.  Ding the bell. */
+      rl_ding ();
+      cxt->history_pos = cxt->last_found_line;
+      rl_display_search (cxt->search_string, cxt->sflags, (cxt->history_pos == cxt->save_line) ? -1 : cxt->history_pos);
+      return 1;
+    }
+
+  /* We have found the search string.  Just display it.  But don't
+     actually move there in the history list until the user accepts
+     the location. */
+  if (cxt->sflags & SF_FOUND)
+    {
+      cxt->prev_line_found = cxt->lines[cxt->history_pos];
+      rl_replace_line (cxt->lines[cxt->history_pos], 0);
+      rl_point = cxt->sline_index;
+      cxt->last_found_line = cxt->history_pos;
+      rl_display_search (cxt->search_string, cxt->sflags, (cxt->history_pos == cxt->save_line) ? -1 : cxt->history_pos);
+    }
+
+  return 1;
+}
+
+int
+_rl_isearch_cleanup (cxt, r)
+     _rl_search_cxt *cxt;
+     int r;
+{
+  if (r >= 0)
+    _rl_isearch_fini (cxt);
+  _rl_scxt_dispose (cxt, 0);
+  _rl_iscxt = 0;
+
+  RL_UNSETSTATE(RL_STATE_ISEARCH);
+
+  return (r != 0);
+}
+
+/* Search through the history looking for an interactively typed string.
+   This is analogous to i-search.  We start the search in the current line.
+   DIRECTION is which direction to search; >= 0 means forward, < 0 means
+   backwards. */
+static int
+rl_search_history (direction, invoking_key)
+     int direction, invoking_key;
+{
+  _rl_search_cxt *cxt;		/* local for now, but saved globally */
+  int c, r;
+
+  RL_SETSTATE(RL_STATE_ISEARCH);
+  cxt = _rl_isearch_init (direction);
+
+  rl_display_search (cxt->search_string, cxt->sflags, -1);
+
+  /* If we are using the callback interface, all we do is set up here and
+      return.  The key is that we leave RL_STATE_ISEARCH set. */
+  if (RL_ISSTATE (RL_STATE_CALLBACK))
+    return (0);
+
+  r = -1;
+  for (;;)
+    {
+      c = _rl_search_getchar (cxt);
+      /* We might want to handle EOF here (c == 0) */
+      r = _rl_isearch_dispatch (cxt, cxt->lastc);
+      if (r <= 0)
+        break;
+    }
+
+  /* The searching is over.  The user may have found the string that she
+     was looking for, or else she may have exited a failing search.  If
+     LINE_INDEX is -1, then that shows that the string searched for was
+     not found.  We use this to determine where to place rl_point. */
+  return (_rl_isearch_cleanup (cxt, r));
+}
+
+#if defined (READLINE_CALLBACKS)
+/* Called from the callback functions when we are ready to read a key.  The
+   callback functions know to call this because RL_ISSTATE(RL_STATE_ISEARCH).
+   If _rl_isearch_dispatch finishes searching, this function is responsible
+   for turning off RL_STATE_ISEARCH, which it does using _rl_isearch_cleanup. */
+int
+_rl_isearch_callback (cxt)
+     _rl_search_cxt *cxt;
+{
+  int c, r;
+
+  c = _rl_search_getchar (cxt);
+  /* We might want to handle EOF here */
+  r = _rl_isearch_dispatch (cxt, cxt->lastc);
+
+  return (r <= 0) ? _rl_isearch_cleanup (cxt, r) : 0;
+}
+#endif