5836a818ec
This reverts commitb558ff043d
. This reverts commit4a11f20659
. The initial import commit failed to retain local changes made to readline's configure.in (and the commit message erroneously stated that there were no local changes that needed to be reapplied). Also the import caused a couple of build errors and a scattering of testsuite regressions throughout many arches. It's probably better to start over with this import, hopefully more carefully next time.
520 lines
12 KiB
C
520 lines
12 KiB
C
/* history.c -- standalone history library */
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/* Copyright (C) 1989-2009 Free Software Foundation, Inc.
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This file contains the GNU History Library (History), a set of
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routines for managing the text of previously typed lines.
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History is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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History is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with History. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* The goal is to make the implementation transparent, so that you
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don't have to know what data types are used, just what functions
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you can call. I think I have done that. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <stdio.h>
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (HAVE_UNISTD_H)
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# ifdef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#include "history.h"
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#include "histlib.h"
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#include "xmalloc.h"
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/* The number of slots to increase the_history by. */
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#define DEFAULT_HISTORY_GROW_SIZE 50
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static char *hist_inittime PARAMS((void));
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/* **************************************************************** */
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/* */
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/* History Functions */
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/* */
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/* **************************************************************** */
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/* An array of HIST_ENTRY. This is where we store the history. */
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static HIST_ENTRY **the_history = (HIST_ENTRY **)NULL;
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/* Non-zero means that we have enforced a limit on the amount of
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history that we save. */
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static int history_stifled;
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/* The current number of slots allocated to the input_history. */
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static int history_size;
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/* If HISTORY_STIFLED is non-zero, then this is the maximum number of
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entries to remember. */
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int history_max_entries;
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int max_input_history; /* backwards compatibility */
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/* The current location of the interactive history pointer. Just makes
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life easier for outside callers. */
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int history_offset;
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/* The number of strings currently stored in the history list. */
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int history_length;
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/* The logical `base' of the history array. It defaults to 1. */
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int history_base = 1;
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/* Return the current HISTORY_STATE of the history. */
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HISTORY_STATE *
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history_get_history_state ()
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{
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HISTORY_STATE *state;
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state = (HISTORY_STATE *)xmalloc (sizeof (HISTORY_STATE));
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state->entries = the_history;
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state->offset = history_offset;
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state->length = history_length;
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state->size = history_size;
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state->flags = 0;
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if (history_stifled)
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state->flags |= HS_STIFLED;
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return (state);
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}
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/* Set the state of the current history array to STATE. */
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void
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history_set_history_state (state)
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HISTORY_STATE *state;
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{
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the_history = state->entries;
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history_offset = state->offset;
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history_length = state->length;
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history_size = state->size;
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if (state->flags & HS_STIFLED)
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history_stifled = 1;
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}
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/* Begin a session in which the history functions might be used. This
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initializes interactive variables. */
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void
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using_history ()
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{
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history_offset = history_length;
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}
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/* Return the number of bytes that the primary history entries are using.
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This just adds up the lengths of the_history->lines and the associated
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timestamps. */
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int
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history_total_bytes ()
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{
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register int i, result;
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for (i = result = 0; the_history && the_history[i]; i++)
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result += HISTENT_BYTES (the_history[i]);
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return (result);
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}
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/* Returns the magic number which says what history element we are
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looking at now. In this implementation, it returns history_offset. */
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int
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where_history ()
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{
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return (history_offset);
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}
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/* Make the current history item be the one at POS, an absolute index.
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Returns zero if POS is out of range, else non-zero. */
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int
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history_set_pos (pos)
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int pos;
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{
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if (pos > history_length || pos < 0 || !the_history)
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return (0);
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history_offset = pos;
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return (1);
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}
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/* Return the current history array. The caller has to be careful, since this
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is the actual array of data, and could be bashed or made corrupt easily.
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The array is terminated with a NULL pointer. */
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HIST_ENTRY **
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history_list ()
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{
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return (the_history);
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}
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/* Return the history entry at the current position, as determined by
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history_offset. If there is no entry there, return a NULL pointer. */
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HIST_ENTRY *
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current_history ()
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{
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return ((history_offset == history_length) || the_history == 0)
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? (HIST_ENTRY *)NULL
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: the_history[history_offset];
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}
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/* Back up history_offset to the previous history entry, and return
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a pointer to that entry. If there is no previous entry then return
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a NULL pointer. */
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HIST_ENTRY *
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previous_history ()
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{
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return history_offset ? the_history[--history_offset] : (HIST_ENTRY *)NULL;
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}
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/* Move history_offset forward to the next history entry, and return
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a pointer to that entry. If there is no next entry then return a
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NULL pointer. */
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HIST_ENTRY *
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next_history ()
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{
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return (history_offset == history_length) ? (HIST_ENTRY *)NULL : the_history[++history_offset];
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}
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/* Return the history entry which is logically at OFFSET in the history array.
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OFFSET is relative to history_base. */
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HIST_ENTRY *
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history_get (offset)
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int offset;
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{
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int local_index;
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local_index = offset - history_base;
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return (local_index >= history_length || local_index < 0 || the_history == 0)
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? (HIST_ENTRY *)NULL
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: the_history[local_index];
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}
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HIST_ENTRY *
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alloc_history_entry (string, ts)
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char *string;
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char *ts;
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{
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HIST_ENTRY *temp;
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temp = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
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temp->line = string ? savestring (string) : string;
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temp->data = (char *)NULL;
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temp->timestamp = ts;
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return temp;
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}
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time_t
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history_get_time (hist)
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HIST_ENTRY *hist;
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{
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char *ts;
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time_t t;
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if (hist == 0 || hist->timestamp == 0)
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return 0;
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ts = hist->timestamp;
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if (ts[0] != history_comment_char)
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return 0;
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t = (time_t) atol (ts + 1); /* XXX - should use strtol() here */
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return t;
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}
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static char *
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hist_inittime ()
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{
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time_t t;
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char ts[64], *ret;
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t = (time_t) time ((time_t *)0);
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#if defined (HAVE_VSNPRINTF) /* assume snprintf if vsnprintf exists */
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snprintf (ts, sizeof (ts) - 1, "X%lu", (unsigned long) t);
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#else
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sprintf (ts, "X%lu", (unsigned long) t);
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#endif
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ret = savestring (ts);
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ret[0] = history_comment_char;
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return ret;
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}
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/* Place STRING at the end of the history list. The data field
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is set to NULL. */
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void
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add_history (string)
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const char *string;
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{
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HIST_ENTRY *temp;
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if (history_stifled && (history_length == history_max_entries))
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{
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register int i;
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/* If the history is stifled, and history_length is zero,
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and it equals history_max_entries, we don't save items. */
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if (history_length == 0)
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return;
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/* If there is something in the slot, then remove it. */
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if (the_history[0])
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(void) free_history_entry (the_history[0]);
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/* Copy the rest of the entries, moving down one slot. */
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for (i = 0; i < history_length; i++)
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the_history[i] = the_history[i + 1];
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history_base++;
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}
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else
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{
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if (history_size == 0)
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{
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history_size = DEFAULT_HISTORY_GROW_SIZE;
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the_history = (HIST_ENTRY **)xmalloc (history_size * sizeof (HIST_ENTRY *));
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history_length = 1;
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}
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else
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{
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if (history_length == (history_size - 1))
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{
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history_size += DEFAULT_HISTORY_GROW_SIZE;
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the_history = (HIST_ENTRY **)
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xrealloc (the_history, history_size * sizeof (HIST_ENTRY *));
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}
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history_length++;
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}
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}
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temp = alloc_history_entry (string, hist_inittime ());
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the_history[history_length] = (HIST_ENTRY *)NULL;
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the_history[history_length - 1] = temp;
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}
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/* Change the time stamp of the most recent history entry to STRING. */
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void
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add_history_time (string)
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const char *string;
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{
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HIST_ENTRY *hs;
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if (string == 0)
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return;
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hs = the_history[history_length - 1];
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FREE (hs->timestamp);
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hs->timestamp = savestring (string);
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}
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/* Free HIST and return the data so the calling application can free it
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if necessary and desired. */
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histdata_t
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free_history_entry (hist)
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HIST_ENTRY *hist;
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{
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histdata_t x;
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if (hist == 0)
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return ((histdata_t) 0);
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FREE (hist->line);
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FREE (hist->timestamp);
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x = hist->data;
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xfree (hist);
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return (x);
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}
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HIST_ENTRY *
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copy_history_entry (hist)
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HIST_ENTRY *hist;
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{
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HIST_ENTRY *ret;
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char *ts;
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if (hist == 0)
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return hist;
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ret = alloc_history_entry (hist->line, (char *)NULL);
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ts = hist->timestamp ? savestring (hist->timestamp) : hist->timestamp;
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ret->timestamp = ts;
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ret->data = hist->data;
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return ret;
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}
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/* Make the history entry at WHICH have LINE and DATA. This returns
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the old entry so you can dispose of the data. In the case of an
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invalid WHICH, a NULL pointer is returned. */
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HIST_ENTRY *
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replace_history_entry (which, line, data)
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int which;
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const char *line;
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histdata_t data;
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{
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HIST_ENTRY *temp, *old_value;
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if (which < 0 || which >= history_length)
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return ((HIST_ENTRY *)NULL);
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temp = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
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old_value = the_history[which];
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temp->line = savestring (line);
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temp->data = data;
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temp->timestamp = savestring (old_value->timestamp);
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the_history[which] = temp;
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return (old_value);
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}
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/* Replace the DATA in the specified history entries, replacing OLD with
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NEW. WHICH says which one(s) to replace: WHICH == -1 means to replace
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all of the history entries where entry->data == OLD; WHICH == -2 means
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to replace the `newest' history entry where entry->data == OLD; and
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WHICH >= 0 means to replace that particular history entry's data, as
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long as it matches OLD. */
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void
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replace_history_data (which,old, new)
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int which;
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histdata_t *old, *new;
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{
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HIST_ENTRY *entry;
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register int i, last;
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if (which < -2 || which >= history_length || history_length == 0 || the_history == 0)
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return;
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if (which >= 0)
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{
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entry = the_history[which];
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if (entry && entry->data == old)
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entry->data = new;
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return;
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}
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last = -1;
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for (i = 0; i < history_length; i++)
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{
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entry = the_history[i];
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if (entry == 0)
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continue;
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if (entry->data == old)
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{
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last = i;
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if (which == -1)
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entry->data = new;
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}
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}
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if (which == -2 && last >= 0)
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{
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entry = the_history[last];
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entry->data = new; /* XXX - we don't check entry->old */
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}
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}
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/* Remove history element WHICH from the history. The removed
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element is returned to you so you can free the line, data,
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and containing structure. */
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HIST_ENTRY *
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remove_history (which)
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int which;
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{
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HIST_ENTRY *return_value;
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register int i;
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if (which < 0 || which >= history_length || history_length == 0 || the_history == 0)
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return ((HIST_ENTRY *)NULL);
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return_value = the_history[which];
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for (i = which; i < history_length; i++)
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the_history[i] = the_history[i + 1];
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history_length--;
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return (return_value);
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}
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/* Stifle the history list, remembering only MAX number of lines. */
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void
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stifle_history (max)
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int max;
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{
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register int i, j;
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if (max < 0)
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max = 0;
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if (history_length > max)
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{
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/* This loses because we cannot free the data. */
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for (i = 0, j = history_length - max; i < j; i++)
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free_history_entry (the_history[i]);
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history_base = i;
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for (j = 0, i = history_length - max; j < max; i++, j++)
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the_history[j] = the_history[i];
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the_history[j] = (HIST_ENTRY *)NULL;
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history_length = j;
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}
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history_stifled = 1;
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max_input_history = history_max_entries = max;
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}
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/* Stop stifling the history. This returns the previous maximum
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number of history entries. The value is positive if the history
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was stifled, negative if it wasn't. */
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int
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unstifle_history ()
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{
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if (history_stifled)
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{
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history_stifled = 0;
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return (history_max_entries);
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}
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else
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return (-history_max_entries);
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}
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int
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history_is_stifled ()
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{
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return (history_stifled);
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}
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void
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clear_history ()
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{
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register int i;
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/* This loses because we cannot free the data. */
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for (i = 0; i < history_length; i++)
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{
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free_history_entry (the_history[i]);
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the_history[i] = (HIST_ENTRY *)NULL;
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}
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history_offset = history_length = 0;
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}
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