lib/readline.c

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/* 
   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(const 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;

        /* Prompt might be NULL in non-interactive mode. */
        if (prompt) {
                x_fprintf(x_stdout, "%s", prompt);
                x_fflush(x_stdout);
        }

        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(const char *prompt, void (*callback)(void), 
                   char **(completion_fn)(const char *text, int start, int end))
{
        char *ret;
        BOOL interactive;

        interactive = isatty(x_fileno(x_stdin)) || getenv("CLI_FORCE_INTERACTIVE");
        if (!interactive) {
            return smb_readline_replacement(NULL, callback, completion_fn);
        }

#if HAVE_LIBREADLINE

        /* 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 HAVE_DECL_RL_EVENT_HOOK
        if (callback)
                rl_event_hook = (Function *)callback;
#endif
        ret = readline(prompt);
        if (ret && *ret)
                add_history(ret);

#else
        ret = smb_readline_replacement(prompt, callback, completion_fn);
#endif

        return ret;
}

/****************************************************************************
 * 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) && defined(HAVE_HISTORY_LIST)
        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;
}

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