isearch.c

在非GUI环境下

/* **************************************************************** */
/*								    */
/*			I-Search and Searching			    */
/*								    */
/* **************************************************************** */

/* Copyright (C) 1987-2002 Free Software Foundation, Inc.

   This file contains the Readline Library (the Library), a set of
   routines for providing Emacs style line input to programs that ask
   for it.

   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. */
#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;

/* Variables imported from other files in the readline library. */
extern HIST_ENTRY *_rl_saved_line_for_history;

/* Forward declarations */
static int rl_search_history PARAMS((int, int));

/* Last line found by the current incremental search, so we don't `find'
   identical lines many times in a row. */
static char *prev_line_found;

/* Last search string and its length. */
static char *last_isearch_string;
static int last_isearch_string_len;

static char *default_isearch_terminators = "\033\012";

/* 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 1 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, reverse_p, where)
     char *search_string;
     int reverse_p, where;
{
  char *message;
  int msglen, searchlen;

  searchlen = (search_string && *search_string) ? strlen (search_string) : 0;

  message = (char *)xmalloc (searchlen + 33);
  msglen = 0;

#if defined (NOTDEF)
  if (where != -1)
    {
      sprintf (message, "[%d]", where + history_base);
      msglen = strlen (message);
    }
#endif /* NOTDEF */

  message[msglen++] = '(';

  if (reverse_p)
    {
      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);
  free (message);
  (*rl_redisplay_function) ();
}

/* 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;
{
  /* The string that the user types in to search for. */
  char *search_string;

  /* The current length of SEARCH_STRING. */
  int search_string_index;

  /* The amount of space that SEARCH_STRING has allocated to it. */
  int search_string_size;

  /* The list of lines to search through. */
  char **lines, *allocated_line;

  /* The length of LINES. */
  int hlen;

  /* Where we get LINES from. */
  HIST_ENTRY **hlist;

  register int i;
  int orig_point, orig_mark, orig_line, last_found_line;
  int c, found, failed, sline_len;
  int n, wstart, wlen;
#if defined (HANDLE_MULTIBYTE)
  char mb[MB_LEN_MAX];
#endif

  /* The line currently being searched. */
  char *sline;

  /* Offset in that line. */
  int line_index;

  /* Non-zero if we are doing a reverse search. */
  int reverse;

  /* The list of characters which terminate the search, but are not
     subsequently executed.  If the variable isearch-terminators has
     been set, we use that value, otherwise we use ESC and C-J. */
  char *isearch_terminators;

  RL_SETSTATE(RL_STATE_ISEARCH);
  orig_point = rl_point;
  orig_mark = rl_mark;
  last_found_line = orig_line = where_history ();
  reverse = direction < 0;
  hlist = history_list ();
  allocated_line = (char *)NULL;

  isearch_terminators = _rl_isearch_terminators ? _rl_isearch_terminators
						: default_isearch_terminators;

  /* Create an arrary of pointers to the lines that we want to search. */
  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. */
  lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *));
  for (i = 0; i < hlen; i++)
    lines[i] = hlist[i]->line;

  if (_rl_saved_line_for_history)
    lines[i] = _rl_saved_line_for_history->line;
  else
    {
      /* Keep track of this so we can free it. */
      allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));
      strcpy (allocated_line, &rl_line_buffer[0]);
      lines[i] = allocated_line;
    }

  hlen++;

  /* The line where we start the search. */
  i = orig_line;

  rl_save_prompt ();

  /* Initialize search parameters. */
  search_string = (char *)xmalloc (search_string_size = 128);
  *search_string = '\0';
  search_string_index = 0;
  prev_line_found = (char *)0;		/* XXX */

  /* Normalize DIRECTION into 1 or -1. */
  direction = (direction >= 0) ? 1 : -1;

  rl_display_search (search_string, reverse, -1);

  sline = rl_line_buffer;
  sline_len = strlen (sline);
  line_index = rl_point;

  found = failed = 0;
  for (;;)
    {
      rl_command_func_t *f = (rl_command_func_t *)NULL;

      /* Read a key and decide how to proceed. */
      RL_SETSTATE(RL_STATE_MOREINPUT);
      c = rl_read_key ();
      RL_UNSETSTATE(RL_STATE_MOREINPUT);

#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	c = _rl_read_mbstring (c, mb, MB_LEN_MAX);
#endif

      /* Translate the keys we do something with to opcodes. */
      if (c >= 0 && _rl_keymap[c].type == ISFUNC)
	{
	  f = _rl_keymap[c].function;

	  if (f == rl_reverse_search_history)
	    c = reverse ? -1 : -2;
	  else if (f == rl_forward_search_history)
	    c =  !reverse ? -1 : -2;
	  else if (f == rl_rubout)
	    c = -3;
	  else if (c == CTRL ('G'))
	    c = -4;
	  else if (c == CTRL ('W'))	/* XXX */
	    c = -5;
	  else if (c == CTRL ('Y'))	/* XXX */
	    c = -6;
	}

      /* The characters in isearch_terminators (set from the user-settable
	 variable isearch-terminators) are used to terminate the search but