source4/lib/cmdline/readline.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba readline wrapper implementation
   4    Copyright (C) Simo Sorce 2001
   5    Copyright (C) Andrew Tridgell 2001
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifdef HAVE_LIBREADLINE
  25 #  ifdef HAVE_READLINE_READLINE_H
  26 #    include <readline/readline.h>
  27 #    ifdef HAVE_READLINE_HISTORY_H
  28 #      include <readline/history.h>
  29 #    endif
  30 #  else
  31 #    ifdef HAVE_READLINE_H
  32 #      include <readline.h>
  33 #      ifdef HAVE_HISTORY_H
  34 #        include <history.h>
  35 #      endif
  36 #    else
  37 #      undef HAVE_LIBREADLINE
  38 #    endif
  39 #  endif
  40 #endif
  41
  42 #ifdef HAVE_NEW_LIBREADLINE
  43 #  define RL_COMPLETION_CAST (rl_completion_func_t *)
  44 #else
  45 /* This type is missing from libreadline<4.0  (approximately) */
  46 #  define RL_COMPLETION_CAST
  47 #endif /* HAVE_NEW_LIBREADLINE */
  48
  49 /****************************************************************************
  50  Display the prompt and wait for input. Call callback() regularly
  51 ****************************************************************************/
  52
  53 static char *smb_readline_replacement(const char *prompt, void (*callback)(void),
  54                                 char **(completion_fn)(const char *text, int start, int end))
  55 {
  56         fd_set fds;
  57         static pstring line;
  58         struct timeval timeout;
  59         int fd = x_fileno(x_stdin);
  60         char *ret;
  61
  62         do_debug("%s", prompt);
  63
  64         while (1) {
  65                 timeout.tv_sec = 5;
  66                 timeout.tv_usec = 0;
  67
  68                 FD_ZERO(&fds);
  69                 FD_SET(fd,&fds);
  70
  71                 if (sys_select_intr(fd+1,&fds,NULL,NULL,&timeout) == 1) {
  72                         ret = x_fgets(line, sizeof(line), x_stdin);
  73                         return ret;
  74                 }
  75                 if (callback)
  76                         callback();
  77         }
  78 }
  79
  80 /****************************************************************************
  81  Display the prompt and wait for input. Call callback() regularly.
  82 ****************************************************************************/
  83
  84 char *smb_readline(const char *prompt, void (*callback)(void),
  85                    char **(completion_fn)(const char *text, int start, int end))
  86 {
  87 #if HAVE_LIBREADLINE
  88         if (isatty(x_fileno(x_stdin))) {
  89                 char *ret;
  90
  91                 /* Aargh!  Readline does bizzare things with the terminal width
  92                 that mucks up expect(1).  Set CLI_NO_READLINE in the environment
  93                 to force readline not to be used. */
  94
  95                 if (getenv("CLI_NO_READLINE"))
  96                         return smb_readline_replacement(prompt, callback, completion_fn);
  97
  98                 if (completion_fn) {
  99                         /* The callback prototype has changed slightly between
 100                         different versions of Readline, so the same function
 101                         works in all of them to date, but we get compiler
 102                         warnings in some.  */
 103                         rl_attempted_completion_function = RL_COMPLETION_CAST completion_fn;
 104                 }
 105
 106                 if (callback)
 107                         rl_event_hook = (Function *)callback;
 108                 ret = readline(prompt);
 109                 if (ret && *ret)
 110                         add_history(ret);
 111                 return ret;
 112         } else
 113 #endif
 114         return smb_readline_replacement(prompt, callback, completion_fn);
 115 }
 116
 117 /****************************************************************************
 118  * return line buffer text
 119  ****************************************************************************/
 120 const char *smb_readline_get_line_buffer(void)
 121 {
 122 #if defined(HAVE_LIBREADLINE)
 123         return rl_line_buffer;
 124 #else
 125         return NULL;
 126 #endif
 127 }
 128
 129 /****************************************************************************
 130  * set completion append character
 131  ***************************************************************************/
 132 void smb_readline_ca_char(char c)
 133 {
 134 #if defined(HAVE_LIBREADLINE)
 135         rl_completion_append_character = c;
 136 #endif
 137 }
 138
 139
 140 /****************************************************************************
 141 history
 142 ****************************************************************************/
 143 int cmd_history(void)
 144 {
 145 #if defined(HAVE_LIBREADLINE)
 146         HIST_ENTRY **hlist;
 147         int i;
 148
 149         hlist = history_list();
 150
 151         for (i = 0; hlist && hlist[i]; i++) {
 152                 DEBUG(0, ("%d: %s\n", i, hlist[i]->line));
 153         }
 154 #else
 155         DEBUG(0,("no history without readline support\n"));
 156 #endif
 157
 158         return 0;
 159 }