Useful add-on libraries

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diff --git a/readline-4.2/history.h b/readline-4.2/history.h
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+/* History.h -- the names of functions that you can call in history. */
+/* Copyright (C) 1989, 1992 Free Software Foundation, Inc.
+
+   This file contains the GNU History Library (the Library), a set of
+   routines for managing the text of previously typed lines.
+
+   The Library is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   The Library is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   The GNU General Public License is often shipped with GNU software, and
+   is generally kept in a file called COPYING or LICENSE.  If you do not
+   have a copy of the license, write to the Free Software Foundation,
+   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#ifndef _HISTORY_H_
+#define _HISTORY_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined READLINE_LIBRARY
+#  include "rlstdc.h"
+#  include "rltypedefs.h"
+#else
+#  include <readline/rlstdc.h>
+#  include <readline/rltypedefs.h>
+#endif
+
+#ifdef __STDC__
+typedef void *histdata_t;
+#else
+typedef char *histdata_t;
+#endif
+
+/* The structure used to store a history entry. */
+typedef struct _hist_entry {
+  char *line;
+  histdata_t data;
+} HIST_ENTRY;
+
+/* A structure used to pass the current state of the history stuff around. */
+typedef struct _hist_state {
+  HIST_ENTRY **entries;		/* Pointer to the entries themselves. */
+  int offset;			/* The location pointer within this array. */
+  int length;			/* Number of elements within this array. */
+  int size;			/* Number of slots allocated to this array. */
+  int flags;
+} HISTORY_STATE;
+
+/* Flag values for the `flags' member of HISTORY_STATE. */
+#define HS_STIFLED	0x01
+
+/* Initialization and state management. */
+
+/* Begin a session in which the history functions might be used.  This
+   just initializes the interactive variables. */
+extern void using_history __P((void));
+
+/* Return the current HISTORY_STATE of the history. */
+extern HISTORY_STATE *history_get_history_state __P((void));
+
+/* Set the state of the current history array to STATE. */
+extern void history_set_history_state __P((HISTORY_STATE *));
+
+/* Manage the history list. */
+
+/* Place STRING at the end of the history list.
+   The associated data field (if any) is set to NULL. */
+extern void add_history __P((const char *));
+
+/* A reasonably useless function, only here for completeness.  WHICH
+   is the magic number that tells us which element to delete.  The
+   elements are numbered from 0. */
+extern HIST_ENTRY *remove_history __P((int));
+
+/* Make the history entry at WHICH have LINE and DATA.  This returns
+   the old entry so you can dispose of the data.  In the case of an
+   invalid WHICH, a NULL pointer is returned. */
+extern HIST_ENTRY *replace_history_entry __P((int, const char *, histdata_t));
+
+/* Clear the history list and start over. */
+extern void clear_history __P((void));
+
+/* Stifle the history list, remembering only MAX number of entries. */
+extern void stifle_history __P((int));
+
+/* Stop stifling the history.  This returns the previous amount the
+   history was stifled by.  The value is positive if the history was
+   stifled, negative if it wasn't. */
+extern int unstifle_history __P((void));
+
+/* Return 1 if the history is stifled, 0 if it is not. */
+extern int history_is_stifled __P((void));
+
+/* Information about the history list. */
+
+/* Return a NULL terminated array of HIST_ENTRY which is the current input
+   history.  Element 0 of this list is the beginning of time.  If there
+   is no history, return NULL. */
+extern HIST_ENTRY **history_list __P((void));
+
+/* Returns the number which says what history element we are now
+   looking at.  */
+extern int where_history __P((void));
+  
+/* Return the history entry at the current position, as determined by
+   history_offset.  If there is no entry there, return a NULL pointer. */
+extern HIST_ENTRY *current_history __P((void));
+
+/* Return the history entry which is logically at OFFSET in the history
+   array.  OFFSET is relative to history_base. */
+extern HIST_ENTRY *history_get __P((int));
+
+/* Return the number of bytes that the primary history entries are using.
+   This just adds up the lengths of the_history->lines. */
+extern int history_total_bytes __P((void));
+
+/* Moving around the history list. */
+
+/* Set the position in the history list to POS. */
+extern int history_set_pos __P((int));
+
+/* Back up history_offset to the previous history entry, and return
+   a pointer to that entry.  If there is no previous entry, return
+   a NULL pointer. */
+extern HIST_ENTRY *previous_history __P((void));
+
+/* Move history_offset forward to the next item in the input_history,
+   and return the a pointer to that entry.  If there is no next entry,
+   return a NULL pointer. */
+extern HIST_ENTRY *next_history __P((void));
+
+/* Searching the history list. */
+
+/* Search the history for STRING, starting at history_offset.
+   If DIRECTION < 0, then the search is through previous entries,
+   else through subsequent.  If the string is found, then
+   current_history () is the history entry, and the value of this function
+   is the offset in the line of that history entry that the string was
+   found in.  Otherwise, nothing is changed, and a -1 is returned. */
+extern int history_search __P((const char *, int));
+
+/* Search the history for STRING, starting at history_offset.
+   The search is anchored: matching lines must begin with string.
+   DIRECTION is as in history_search(). */
+extern int history_search_prefix __P((const char *, int));
+
+/* Search for STRING in the history list, starting at POS, an
+   absolute index into the list.  DIR, if negative, says to search
+   backwards from POS, else forwards.
+   Returns the absolute index of the history element where STRING
+   was found, or -1 otherwise. */
+extern int history_search_pos __P((const char *, int, int));
+
+/* Managing the history file. */
+
+/* Add the contents of FILENAME to the history list, a line at a time.
+   If FILENAME is NULL, then read from ~/.history.  Returns 0 if
+   successful, or errno if not. */
+extern int read_history __P((const char *));
+
+/* Read a range of lines from FILENAME, adding them to the history list.
+   Start reading at the FROM'th line and end at the TO'th.  If FROM
+   is zero, start at the beginning.  If TO is less than FROM, read
+   until the end of the file.  If FILENAME is NULL, then read from
+   ~/.history.  Returns 0 if successful, or errno if not. */
+extern int read_history_range __P((const char *, int, int));
+
+/* Write the current history to FILENAME.  If FILENAME is NULL,
+   then write the history list to ~/.history.  Values returned
+   are as in read_history ().  */
+extern int write_history __P((const char *));
+
+/* Append NELEMENT entries to FILENAME.  The entries appended are from
+   the end of the list minus NELEMENTs up to the end of the list. */
+extern int append_history __P((int, const char *));
+
+/* Truncate the history file, leaving only the last NLINES lines. */
+extern int history_truncate_file __P((const char *, int));
+
+/* History expansion. */
+
+/* Expand the string STRING, placing the result into OUTPUT, a pointer
+   to a string.  Returns:
+
+   0) If no expansions took place (or, if the only change in
+      the text was the de-slashifying of the history expansion
+      character)
+   1) If expansions did take place
+  -1) If there was an error in expansion.
+   2) If the returned line should just be printed.
+
+  If an error ocurred in expansion, then OUTPUT contains a descriptive
+  error message. */
+extern int history_expand __P((char *, char **));
+
+/* Extract a string segment consisting of the FIRST through LAST
+   arguments present in STRING.  Arguments are broken up as in
+   the shell. */
+extern char *history_arg_extract __P((int, int, const char *));
+
+/* Return the text of the history event beginning at the current
+   offset into STRING.  Pass STRING with *INDEX equal to the
+   history_expansion_char that begins this specification.
+   DELIMITING_QUOTE is a character that is allowed to end the string
+   specification for what to search for in addition to the normal
+   characters `:', ` ', `\t', `\n', and sometimes `?'. */
+extern char *get_history_event __P((const char *, int *, int));
+
+/* Return an array of tokens, much as the shell might.  The tokens are
+   parsed out of STRING. */
+extern char **history_tokenize __P((const char *));
+
+/* Exported history variables. */
+extern int history_base;
+extern int history_length;
+extern int history_max_entries;
+extern char history_expansion_char;
+extern char history_subst_char;
+extern char *history_word_delimiters;
+extern char history_comment_char;
+extern char *history_no_expand_chars;
+extern char *history_search_delimiter_chars;
+extern int history_quotes_inhibit_expansion;
+
+/* Backwards compatibility */
+extern int max_input_history;
+
+/* If set, this function is called to decide whether or not a particular
+   history expansion should be treated as a special case for the calling
+   application and not expanded. */
+extern rl_linebuf_func_t *history_inhibit_expansion_function;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_HISTORY_H_ */