src/hci/shell.c

   1 /*
   2  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <readline/readline.h>
  25 #include <gpxe/command.h>
  26 #include <gpxe/shell.h>
  27
  28 /** @file
  29  *
  30  * Minimal command shell
  31  *
  32  */
  33
  34 /** The shell prompt string */
  35 static const char shell_prompt[] = "gPXE> ";
  36
  37 /** Flag set in order to exit shell */
  38 static int exit_flag = 0;
  39
  40 /** "exit" command body */
  41 static int exit_exec ( int argc, char **argv __unused ) {
  42
  43         if ( argc == 1 ) {
  44                 exit_flag = 1;
  45         } else {
  46                 printf ( "Usage: exit\n"
  47                          "Exits the command shell\n" );
  48         }
  49
  50         return 0;
  51 }
  52
  53 /** "exit" command definition */
  54 struct command exit_command __command = {
  55         .name = "exit",
  56         .exec = exit_exec,
  57 };
  58
  59 /** "help" command body */
  60 static int help_exec ( int argc __unused, char **argv __unused ) {
  61         struct command *command;
  62         unsigned int hpos = 0;
  63
  64         printf ( "\nAvailable commands:\n\n" );
  65         for_each_table_entry ( command, COMMANDS ) {
  66                 hpos += printf ( "  %s", command->name );
  67                 if ( hpos > ( 16 * 4 ) ) {
  68                         printf ( "\n" );
  69                         hpos = 0;
  70                 } else {
  71                         while ( hpos % 16 ) {
  72                                 printf ( " " );
  73                                 hpos++;
  74                         }
  75                 }
  76         }
  77         printf ( "\n\nType \"<command> --help\" for further information\n\n" );
  78         return 0;
  79 }
  80
  81 /** "help" command definition */
  82 struct command help_command __command = {
  83         .name = "help",
  84         .exec = help_exec,
  85 };
  86
  87 /**
  88  * Start command shell
  89  *
  90  */
  91 void shell ( void ) {
  92         char *line;
  93
  94         exit_flag = 0;
  95         while ( ! exit_flag ) {
  96                 line = readline ( shell_prompt );
  97                 if ( line ) {
  98                         system ( line );
  99                         free ( line );
 100                 }
 101         }
 102 }