readline.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
   Unix SMB/CIFS implementation.
   Samba readline wrapper implementation
   Copyright (C) Simo Sorce 2001
   Copyright (C) Andrew Tridgell 2001
   
   This program 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 of the License, or
   (at your option) any later version.
   
   This program 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.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

#ifdef HAVE_LIBREADLINE
#  ifdef HAVE_READLINE_READLINE_H
#    include <readline/readline.h>
#    ifdef HAVE_READLINE_HISTORY_H
#      include <readline/history.h>
#    endif
#  else
#    ifdef HAVE_READLINE_H
#      include <readline.h>
#      ifdef HAVE_HISTORY_H
#        include <history.h>
#      endif
#    else
#      undef HAVE_LIBREADLINE
#    endif
#  endif
#endif

#ifdef HAVE_NEW_LIBREADLINE
#  define RL_COMPLETION_CAST (rl_completion_func_t *)
#else
/* This type is missing from libreadline<4.0  (approximately) */
#  define RL_COMPLETION_CAST
#endif /* HAVE_NEW_LIBREADLINE */

/****************************************************************************
 Display the prompt and wait for input. Call callback() regularly
****************************************************************************/

static char *smb_readline_replacement(char *prompt, void (*callback)(void), 
				char **(completion_fn)(const char *text, int start, int end))
{
	fd_set fds;
	static pstring line;
	struct timeval timeout;
	int fd = x_fileno(x_stdin);
	char *ret;

	x_fprintf(dbf, "%s", prompt);
	x_fflush(dbf);

	while (1) {
		timeout.tv_sec = 5;
		timeout.tv_usec = 0;

		FD_ZERO(&fds);
		FD_SET(fd,&fds);
	
		if (sys_select_intr(fd+1,&fds,NULL,NULL,&timeout) == 1) {
			ret = x_fgets(line, sizeof(line), x_stdin);
			return ret;
		}
		if (callback)
			callback();
	}
}

/****************************************************************************
 Display the prompt and wait for input. Call callback() regularly.
****************************************************************************/

char *smb_readline(char *prompt, void (*callback)(void), 
		   char **(completion_fn)(const char *text, int start, int end))
{
#if HAVE_LIBREADLINE
	if (isatty(x_fileno(x_stdin))) {
		char *ret;

		/* Aargh!  Readline does bizzare things with the terminal width
		that mucks up expect(1).  Set CLI_NO_READLINE in the environment
		to force readline not to be used. */

		if (getenv("CLI_NO_READLINE"))
			return smb_readline_replacement(prompt, callback, completion_fn);

		if (completion_fn) {
			/* The callback prototype has changed slightly between
			different versions of Readline, so the same function
			works in all of them to date, but we get compiler
			warnings in some.  */
			rl_attempted_completion_function = RL_COMPLETION_CAST completion_fn;
		}

		if (callback)
			rl_event_hook = (Function *)callback;
		ret = readline(prompt);
		if (ret && *ret)
			add_history(ret);
		return ret;
	} else
#endif
	return smb_readline_replacement(prompt, callback, completion_fn);
}

/****************************************************************************
 * return line buffer text
 ****************************************************************************/
const char *smb_readline_get_line_buffer(void)
{
#if defined(HAVE_LIBREADLINE)
	return rl_line_buffer;
#else
	return NULL;
#endif
}


/****************************************************************************
 * set completion append character
 ***************************************************************************/
void smb_readline_ca_char(char c)
{
#if defined(HAVE_LIBREADLINE)
	rl_completion_append_character = c;
#endif
}

/****************************************************************************
history
****************************************************************************/
int cmd_history(void)
{
#if defined(HAVE_LIBREADLINE)
	HIST_ENTRY **hlist;
	int i;

	hlist = history_list();
	
	for (i = 0; hlist && hlist[i]; i++) {
		DEBUG(0, ("%d: %s\n", i, hlist[i]->line));
	}
#else
	DEBUG(0,("no history without readline support\n"));
#endif

	return 0;
}