isearch.c

在非GUI环境下

	 not subsequently execute the character as a command.  The default
	 value is "\033\012" (ESC and C-J). */
      if (strchr (isearch_terminators, c))
	{
	  /* 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 (c == ESC && _rl_input_available ())
	    rl_execute_next (ESC);
	  break;
	}

#define ENDSRCH_CHAR(c) \
  ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G')))

#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	{
	  if (c >= 0 && strlen (mb) == 1 && ENDSRCH_CHAR (c))
	    {
	      /* This sets rl_pending_input to c; it will be picked up the next
		 time rl_read_key is called. */
	      rl_execute_next (c);
	      break;
	    }
	}
      else
#endif
      if (c >= 0 && ENDSRCH_CHAR (c))
	{
	  /* This sets rl_pending_input to c; it will be picked up the next
	     time rl_read_key is called. */
	  rl_execute_next (c);
	  break;
	}

      switch (c)
	{
	case -1:
	  if (search_string_index == 0)
	    {
	      if (last_isearch_string)
		{
		  search_string_size = 64 + last_isearch_string_len;
		  search_string = (char *)xrealloc (search_string, search_string_size);
		  strcpy (search_string, last_isearch_string);
		  search_string_index = last_isearch_string_len;
		  rl_display_search (search_string, reverse, -1);
		  break;
		}
	      continue;
	    }
	  else if (reverse)
	    --line_index;
	  else if (line_index != sline_len)
	    ++line_index;
	  else
	    rl_ding ();
	  break;

	  /* switch directions */
	case -2:
	  direction = -direction;
	  reverse = direction < 0;
	  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 (search_string_index == 0)
	    rl_ding ();
	  else
	    search_string[--search_string_index] = '\0';

	  break;

	case -4:	/* C-G */
	  rl_replace_line (lines[orig_line], 0);
	  rl_point = orig_point;
	  rl_mark = orig_mark;
	  rl_restore_prompt();
	  rl_clear_message ();
	  if (allocated_line)
	    free (allocated_line);
	  free (lines);
	  RL_UNSETSTATE(RL_STATE_ISEARCH);
	  return 0;

	case -5:	/* C-W */
	  /* skip over portion of line we already matched */
	  wstart = rl_point + search_string_index;
	  if (wstart >= rl_end)
	    {
	      rl_ding ();
	      break;
	    }

	  /* if not in a word, move to one. */
	  if (rl_alphabetic(rl_line_buffer[wstart]) == 0)
	    {
	      rl_ding ();
	      break;
	    }
	  n = wstart;
	  while (n < rl_end && rl_alphabetic(rl_line_buffer[n]))
	    n++;
	  wlen = n - wstart + 1;
	  if (search_string_index + wlen + 1 >= search_string_size)
	    {
	      search_string_size += wlen + 1;
	      search_string = (char *)xrealloc (search_string, search_string_size);
	    }
	  for (; wstart < n; wstart++)
	    search_string[search_string_index++] = rl_line_buffer[wstart];
	  search_string[search_string_index] = '\0';
	  break;

	case -6:	/* C-Y */
	  /* skip over portion of line we already matched */
	  wstart = rl_point + search_string_index;
	  if (wstart >= rl_end)
	    {
	      rl_ding ();
	      break;
	    }
	  n = rl_end - wstart + 1;
	  if (search_string_index + n + 1 >= search_string_size)
	    {
	      search_string_size += n + 1;
	      search_string = (char *)xrealloc (search_string, search_string_size);
	    }
	  for (n = wstart; n < rl_end; n++)
	    search_string[search_string_index++] = rl_line_buffer[n];
	  search_string[search_string_index] = '\0';
	  break;

	default:
	  /* Add character to search string and continue search. */
	  if (search_string_index + 2 >= search_string_size)
	    {
	      search_string_size += 128;
	      search_string = (char *)xrealloc (search_string, search_string_size);
	    }
#if defined (HANDLE_MULTIBYTE)
	  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	    {
	      int j, l;
	      for (j = 0, l = strlen (mb); j < l; )
		search_string[search_string_index++] = mb[j++];
	    }
	  else
#endif
	    search_string[search_string_index++] = c;
	  search_string[search_string_index] = '\0';
	  break;
	}

      for (found = failed = 0;;)
	{
	  int limit = sline_len - search_string_index + 1;

	  /* Search the current line. */
	  while (reverse ? (line_index >= 0) : (line_index < limit))
	    {
	      if (STREQN (search_string, sline + line_index, search_string_index))
		{
		  found++;
		  break;
		}
	      else
		line_index += direction;
	    }
	  if (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. */
	      i += direction;

	      /* At limit for direction? */
	      if (reverse ? (i < 0) : (i == hlen))
		{
		  failed++;
		  break;
		}

	      /* We will need these later. */
	      sline = lines[i];
	      sline_len = strlen (sline);
	    }
	  while ((prev_line_found && STREQ (prev_line_found, lines[i])) ||
		 (search_string_index > sline_len));

	  if (failed)
	    break;

	  /* Now set up the line for searching... */
	  line_index = reverse ? sline_len - search_string_index : 0;
	}

      if (failed)
	{
	  /* We cannot find the search string.  Ding the bell. */
	  rl_ding ();
	  i = last_found_line;
	  continue; 		/* XXX - was break */
	}

      /* 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 (found)
	{
	  prev_line_found = lines[i];
	  rl_replace_line (lines[i], 0);
	  rl_point = line_index;
	  last_found_line = i;
	  rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i);
	}
    }

  /* 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. */

  /* First put back the original state. */
  strcpy (rl_line_buffer, lines[orig_line]);

  rl_restore_prompt ();

  /* Save the search string for possible later use. */
  FREE (last_isearch_string);
  last_isearch_string = search_string;
  last_isearch_string_len = search_string_index;

  if (last_found_line < orig_line)
    rl_get_previous_history (orig_line - last_found_line, 0);
  else
    rl_get_next_history (last_found_line - orig_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 (line_index < 0)
    {
      if (last_found_line == orig_line)
	line_index = orig_point;
      else
	line_index = strlen (rl_line_buffer);
      rl_mark = orig_mark;
    }

  rl_point = line_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 ();

  FREE (allocated_line);
  free (lines);

  RL_UNSETSTATE(RL_STATE_ISEARCH);

  return 0;
}