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authorElena Zannoni <ezannoni@kwikemart.cygnus.com>2002-08-23 22:02:32 +0000
committerElena Zannoni <ezannoni@kwikemart.cygnus.com>2002-08-23 22:02:32 +0000
commit84041b4c47edb0461f3b82afb77ca2d81819ebfa (patch)
treeddbca1e6f70f9c4a4b6c3c923b16603a95946b22 /readline/misc.c
parentf9267e152c9c4e2b150366c590674180e66d45df (diff)
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import of readline-4.3
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+/* misc.c -- miscellaneous bindable readline functions. */
+
+/* Copyright (C) 1987-2002 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library, a library for
+ reading lines of text with interactive input and history editing.
+
+ The GNU Readline 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 GNU Readline 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. */
+#define READLINE_LIBRARY
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#if defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#else
+# include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+
+#if defined (HAVE_LOCALE_H)
+# include <locale.h>
+#endif
+
+#include <stdio.h>
+
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+#include "rlmbutil.h"
+
+/* Some standard library routines. */
+#include "readline.h"
+#include "history.h"
+
+#include "rlprivate.h"
+#include "rlshell.h"
+#include "xmalloc.h"
+
+static int rl_digit_loop PARAMS((void));
+static void _rl_history_set_point PARAMS((void));
+
+/* Forward declarations used in this file */
+void _rl_free_history_entry PARAMS((HIST_ENTRY *));
+
+/* If non-zero, rl_get_previous_history and rl_get_next_history attempt
+ to preserve the value of rl_point from line to line. */
+int _rl_history_preserve_point = 0;
+
+/* Saved target point for when _rl_history_preserve_point is set. Special
+ value of -1 means that point is at the end of the line. */
+int _rl_history_saved_point = -1;
+
+/* **************************************************************** */
+/* */
+/* Numeric Arguments */
+/* */
+/* **************************************************************** */
+
+/* Handle C-u style numeric args, as well as M--, and M-digits. */
+static int
+rl_digit_loop ()
+{
+ int key, c, sawminus, sawdigits;
+
+ rl_save_prompt ();
+
+ RL_SETSTATE(RL_STATE_NUMERICARG);
+ sawminus = sawdigits = 0;
+ while (1)
+ {
+ if (rl_numeric_arg > 1000000)
+ {
+ sawdigits = rl_explicit_arg = rl_numeric_arg = 0;
+ rl_ding ();
+ rl_restore_prompt ();
+ rl_clear_message ();
+ RL_UNSETSTATE(RL_STATE_NUMERICARG);
+ return 1;
+ }
+ rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);
+ RL_SETSTATE(RL_STATE_MOREINPUT);
+ key = c = rl_read_key ();
+ RL_UNSETSTATE(RL_STATE_MOREINPUT);
+
+ if (c < 0)
+ {
+ _rl_abort_internal ();
+ return -1;
+ }
+
+ /* If we see a key bound to `universal-argument' after seeing digits,
+ it ends the argument but is otherwise ignored. */
+ if (_rl_keymap[c].type == ISFUNC &&
+ _rl_keymap[c].function == rl_universal_argument)
+ {
+ if (sawdigits == 0)
+ {
+ rl_numeric_arg *= 4;
+ continue;
+ }
+ else
+ {
+ RL_SETSTATE(RL_STATE_MOREINPUT);
+ key = rl_read_key ();
+ RL_UNSETSTATE(RL_STATE_MOREINPUT);
+ rl_restore_prompt ();
+ rl_clear_message ();
+ RL_UNSETSTATE(RL_STATE_NUMERICARG);
+ return (_rl_dispatch (key, _rl_keymap));
+ }
+ }
+
+ c = UNMETA (c);
+
+ if (_rl_digit_p (c))
+ {
+ rl_numeric_arg = rl_explicit_arg ? (rl_numeric_arg * 10) + c - '0' : c - '0';
+ sawdigits = rl_explicit_arg = 1;
+ }
+ else if (c == '-' && rl_explicit_arg == 0)
+ {
+ rl_numeric_arg = sawminus = 1;
+ rl_arg_sign = -1;
+ }
+ else
+ {
+ /* Make M-- command equivalent to M--1 command. */
+ if (sawminus && rl_numeric_arg == 1 && rl_explicit_arg == 0)
+ rl_explicit_arg = 1;
+ rl_restore_prompt ();
+ rl_clear_message ();
+ RL_UNSETSTATE(RL_STATE_NUMERICARG);
+ return (_rl_dispatch (key, _rl_keymap));
+ }
+ }
+
+ /*NOTREACHED*/
+}
+
+/* Add the current digit to the argument in progress. */
+int
+rl_digit_argument (ignore, key)
+ int ignore, key;
+{
+ rl_execute_next (key);
+ return (rl_digit_loop ());
+}
+
+/* What to do when you abort reading an argument. */
+int
+rl_discard_argument ()
+{
+ rl_ding ();
+ rl_clear_message ();
+ _rl_init_argument ();
+ return 0;
+}
+
+/* Create a default argument. */
+int
+_rl_init_argument ()
+{
+ rl_numeric_arg = rl_arg_sign = 1;
+ rl_explicit_arg = 0;
+ return 0;
+}
+
+/* C-u, universal argument. Multiply the current argument by 4.
+ Read a key. If the key has nothing to do with arguments, then
+ dispatch on it. If the key is the abort character then abort. */
+int
+rl_universal_argument (count, key)
+ int count, key;
+{
+ rl_numeric_arg *= 4;
+ return (rl_digit_loop ());
+}
+
+/* **************************************************************** */
+/* */
+/* History Utilities */
+/* */
+/* **************************************************************** */
+
+/* We already have a history library, and that is what we use to control
+ the history features of readline. This is our local interface to
+ the history mechanism. */
+
+/* While we are editing the history, this is the saved
+ version of the original line. */
+HIST_ENTRY *_rl_saved_line_for_history = (HIST_ENTRY *)NULL;
+
+/* Set the history pointer back to the last entry in the history. */
+void
+_rl_start_using_history ()
+{
+ using_history ();
+ if (_rl_saved_line_for_history)
+ _rl_free_history_entry (_rl_saved_line_for_history);
+
+ _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
+}
+
+/* Free the contents (and containing structure) of a HIST_ENTRY. */
+void
+_rl_free_history_entry (entry)
+ HIST_ENTRY *entry;
+{
+ if (entry == 0)
+ return;
+ if (entry->line)
+ free (entry->line);
+ free (entry);
+}
+
+/* Perhaps put back the current line if it has changed. */
+int
+rl_maybe_replace_line ()
+{
+ HIST_ENTRY *temp;
+
+ temp = current_history ();
+ /* If the current line has changed, save the changes. */
+ if (temp && ((UNDO_LIST *)(temp->data) != rl_undo_list))
+ {
+ temp = replace_history_entry (where_history (), rl_line_buffer, (histdata_t)rl_undo_list);
+ free (temp->line);
+ free (temp);
+ }
+ return 0;
+}
+
+/* Restore the _rl_saved_line_for_history if there is one. */
+int
+rl_maybe_unsave_line ()
+{
+ if (_rl_saved_line_for_history)
+ {
+ rl_replace_line (_rl_saved_line_for_history->line, 0);
+ rl_undo_list = (UNDO_LIST *)_rl_saved_line_for_history->data;
+ _rl_free_history_entry (_rl_saved_line_for_history);
+ _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
+ rl_point = rl_end; /* rl_replace_line sets rl_end */
+ }
+ else
+ rl_ding ();
+ return 0;
+}
+
+/* Save the current line in _rl_saved_line_for_history. */
+int
+rl_maybe_save_line ()
+{
+ if (_rl_saved_line_for_history == 0)
+ {
+ _rl_saved_line_for_history = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
+ _rl_saved_line_for_history->line = savestring (rl_line_buffer);
+ _rl_saved_line_for_history->data = (char *)rl_undo_list;
+ }
+ return 0;
+}
+
+int
+_rl_free_saved_history_line ()
+{
+ if (_rl_saved_line_for_history)
+ {
+ _rl_free_history_entry (_rl_saved_line_for_history);
+ _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
+ }
+ return 0;
+}
+
+static void
+_rl_history_set_point ()
+{
+ rl_point = (_rl_history_preserve_point && _rl_history_saved_point != -1)
+ ? _rl_history_saved_point
+ : rl_end;
+ if (rl_point > rl_end)
+ rl_point = rl_end;
+
+#if defined (VI_MODE)
+ if (rl_editing_mode == vi_mode)
+ rl_point = 0;
+#endif /* VI_MODE */
+
+ if (rl_editing_mode == emacs_mode)
+ rl_mark = (rl_point == rl_end ? 0 : rl_end);
+}
+
+void
+rl_replace_from_history (entry, flags)
+ HIST_ENTRY *entry;
+ int flags; /* currently unused */
+{
+ rl_replace_line (entry->line, 0);
+ rl_undo_list = (UNDO_LIST *)entry->data;
+ rl_point = rl_end;
+ rl_mark = 0;
+
+#if defined (VI_MODE)
+ if (rl_editing_mode == vi_mode)
+ {
+ rl_point = 0;
+ rl_mark = rl_end;
+ }
+#endif
+}
+
+/* **************************************************************** */
+/* */
+/* History Commands */
+/* */
+/* **************************************************************** */
+
+/* Meta-< goes to the start of the history. */
+int
+rl_beginning_of_history (count, key)
+ int count, key;
+{
+ return (rl_get_previous_history (1 + where_history (), key));
+}
+
+/* Meta-> goes to the end of the history. (The current line). */
+int
+rl_end_of_history (count, key)
+ int count, key;
+{
+ rl_maybe_replace_line ();
+ using_history ();
+ rl_maybe_unsave_line ();
+ return 0;
+}
+
+/* Move down to the next history line. */
+int
+rl_get_next_history (count, key)
+ int count, key;
+{
+ HIST_ENTRY *temp;
+
+ if (count < 0)
+ return (rl_get_previous_history (-count, key));
+
+ if (count == 0)
+ return 0;
+
+ rl_maybe_replace_line ();
+
+ /* either not saved by rl_newline or at end of line, so set appropriately. */
+ if (_rl_history_saved_point == -1 && (rl_point || rl_end))
+ _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;
+
+ temp = (HIST_ENTRY *)NULL;
+ while (count)
+ {
+ temp = next_history ();
+ if (!temp)
+ break;
+ --count;
+ }
+
+ if (temp == 0)
+ rl_maybe_unsave_line ();
+ else
+ {
+ rl_replace_from_history (temp, 0);
+ _rl_history_set_point ();
+ }
+ return 0;
+}
+
+/* Get the previous item out of our interactive history, making it the current
+ line. If there is no previous history, just ding. */
+int
+rl_get_previous_history (count, key)
+ int count, key;
+{
+ HIST_ENTRY *old_temp, *temp;
+
+ if (count < 0)
+ return (rl_get_next_history (-count, key));
+
+ if (count == 0)
+ return 0;
+
+ /* either not saved by rl_newline or at end of line, so set appropriately. */
+ if (_rl_history_saved_point == -1 && (rl_point || rl_end))
+ _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;
+
+ /* If we don't have a line saved, then save this one. */
+ rl_maybe_save_line ();
+
+ /* If the current line has changed, save the changes. */
+ rl_maybe_replace_line ();
+
+ temp = old_temp = (HIST_ENTRY *)NULL;
+ while (count)
+ {
+ temp = previous_history ();
+ if (temp == 0)
+ break;
+
+ old_temp = temp;
+ --count;
+ }
+
+ /* If there was a large argument, and we moved back to the start of the
+ history, that is not an error. So use the last value found. */
+ if (!temp && old_temp)
+ temp = old_temp;
+
+ if (temp == 0)
+ rl_ding ();
+ else
+ {
+ rl_replace_from_history (temp, 0);
+ _rl_history_set_point ();
+ }
+ return 0;
+}
+
+/* **************************************************************** */
+/* */
+/* Editing Modes */
+/* */
+/* **************************************************************** */
+/* How to toggle back and forth between editing modes. */
+int
+rl_vi_editing_mode (count, key)
+ int count, key;
+{
+#if defined (VI_MODE)
+ _rl_set_insert_mode (RL_IM_INSERT, 1); /* vi mode ignores insert mode */
+ rl_editing_mode = vi_mode;
+ rl_vi_insertion_mode (1, key);
+#endif /* VI_MODE */
+
+ return 0;
+}
+
+int
+rl_emacs_editing_mode (count, key)
+ int count, key;
+{
+ rl_editing_mode = emacs_mode;
+ _rl_set_insert_mode (RL_IM_INSERT, 1); /* emacs mode default is insert mode */
+ _rl_keymap = emacs_standard_keymap;
+ return 0;
+}
+
+/* Function for the rest of the library to use to set insert/overwrite mode. */
+void
+_rl_set_insert_mode (im, force)
+ int im, force;
+{
+#ifdef CURSOR_MODE
+ _rl_set_cursor (im, force);
+#endif
+
+ rl_insert_mode = im;
+}
+
+/* Toggle overwrite mode. A positive explicit argument selects overwrite
+ mode. A negative or zero explicit argument selects insert mode. */
+int
+rl_overwrite_mode (count, key)
+ int count, key;
+{
+ if (rl_explicit_arg == 0)
+ _rl_set_insert_mode (rl_insert_mode ^ 1, 0);
+ else if (count > 0)
+ _rl_set_insert_mode (RL_IM_OVERWRITE, 0);
+ else
+ _rl_set_insert_mode (RL_IM_INSERT, 0);
+
+ return 0;
+}