source/lib/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 3 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, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22
  23 #ifdef HAVE_LIBREADLINE
  24 #  ifdef HAVE_READLINE_READLINE_H
  25 #    include <readline/readline.h>
  26 #    ifdef HAVE_READLINE_HISTORY_H
  27 #      include <readline/history.h>
  28 #    endif
  29 #  else
  30 #    ifdef HAVE_READLINE_H
  31 #      include <readline.h>
  32 #      ifdef HAVE_HISTORY_H
  33 #        include <history.h>
  34 #      endif
  35 #    else
  36 #      undef HAVE_LIBREADLINE
  37 #    endif
  38 #  endif
  39 #endif
  40
  41 #ifdef HAVE_NEW_LIBREADLINE
  42 #  define RL_COMPLETION_CAST (rl_completion_func_t *)
  43 #else
  44 /* This type is missing from libreadline<4.0  (approximately) */
  45 #  define RL_COMPLETION_CAST
  46 #endif /* HAVE_NEW_LIBREADLINE */
  47
  48 /****************************************************************************
  49  Display the prompt and wait for input. Call callback() regularly
  50 ****************************************************************************/
  51
  52 static char *smb_readline_replacement(const char *prompt, void (*callback)(void),
  53                                 char **(completion_fn)(const char *text, int start, int end))
  54 {
  55         fd_set fds;
  56         static pstring line;
  57         struct timeval timeout;
  58         int fd = x_fileno(x_stdin);
  59         char *ret;
  60
  61         /* Prompt might be NULL in non-interactive mode. */
  62         if (prompt) {
  63                 x_fprintf(x_stdout, "%s", prompt);
  64                 x_fflush(x_stdout);
  65         }
  66
  67         while (1) {
  68                 timeout.tv_sec = 5;
  69                 timeout.tv_usec = 0;
  70
  71                 FD_ZERO(&fds);
  72                 FD_SET(fd,&fds);
  73
  74                 if (sys_select_intr(fd+1,&fds,NULL,NULL,&timeout) == 1) {
  75                         ret = x_fgets(line, sizeof(line), x_stdin);
  76                         return ret;
  77                 }
  78                 if (callback)
  79                         callback();
  80         }
  81 }
  82
  83 /****************************************************************************
  84  Display the prompt and wait for input. Call callback() regularly.
  85 ****************************************************************************/
  86
  87 char *smb_readline(const char *prompt, void (*callback)(void),
  88                    char **(completion_fn)(const char *text, int start, int end))
  89 {
  90         char *ret;
  91         BOOL interactive;
  92
  93         interactive = isatty(x_fileno(x_stdin)) || getenv("CLI_FORCE_INTERACTIVE");
  94         if (!interactive) {
  95             return smb_readline_replacement(NULL, callback, completion_fn);
  96         }
  97
  98 #if HAVE_LIBREADLINE
  99
 100         /* Aargh!  Readline does bizzare things with the terminal width
 101         that mucks up expect(1).  Set CLI_NO_READLINE in the environment
 102         to force readline not to be used. */
 103
 104         if (getenv("CLI_NO_READLINE"))
 105                 return smb_readline_replacement(prompt, callback, completion_fn);
 106
 107         if (completion_fn) {
 108                 /* The callback prototype has changed slightly between
 109                 different versions of Readline, so the same function
 110                 works in all of them to date, but we get compiler
 111                 warnings in some.  */
 112                 rl_attempted_completion_function = RL_COMPLETION_CAST completion_fn;
 113         }
 114
 115 #if HAVE_DECL_RL_EVENT_HOOK
 116         if (callback)
 117                 rl_event_hook = (Function *)callback;
 118 #endif
 119         ret = readline(prompt);
 120         if (ret && *ret)
 121                 add_history(ret);
 122
 123 #else
 124         ret = smb_readline_replacement(prompt, callback, completion_fn);
 125 #endif
 126
 127         return ret;
 128 }
 129
 130 /****************************************************************************
 131  * return line buffer text
 132  ****************************************************************************/
 133 const char *smb_readline_get_line_buffer(void)
 134 {
 135 #if defined(HAVE_LIBREADLINE)
 136         return rl_line_buffer;
 137 #else
 138         return NULL;
 139 #endif
 140 }
 141
 142
 143 /****************************************************************************
 144  * set completion append character
 145  ***************************************************************************/
 146 void smb_readline_ca_char(char c)
 147 {
 148 #if defined(HAVE_LIBREADLINE)
 149         rl_completion_append_character = c;
 150 #endif
 151 }
 152
 153 /****************************************************************************
 154 history
 155 ****************************************************************************/
 156 int cmd_history(void)
 157 {
 158 #if defined(HAVE_LIBREADLINE) && defined(HAVE_HISTORY_LIST)
 159         HIST_ENTRY **hlist;
 160         int i;
 161
 162         hlist = history_list();
 163
 164         for (i = 0; hlist && hlist[i]; i++) {
 165                 DEBUG(0, ("%d: %s\n", i, hlist[i]->line));
 166         }
 167 #else
 168         DEBUG(0,("no history without readline support\n"));
 169 #endif
 170
 171         return 0;
 172 }
 173