gpxe/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 #include <stdint.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <readline/readline.h>
  23 #include <gpxe/command.h>
  24 #include <gpxe/shell.h>
  25
  26 /** @file
  27  *
  28  * Minimal command shell
  29  *
  30  */
  31
  32 static struct command commands[0]
  33         __table_start ( struct command, commands );
  34 static struct command commands_end[0]
  35         __table_end ( struct command, commands );
  36
  37 /** The shell prompt string */
  38 static const char shell_prompt[] = "gPXE> ";
  39
  40 /** Flag set in order to exit shell */
  41 static int exit_flag = 0;
  42
  43 /** "exit" command body */
  44 static int exit_exec ( int argc, char **argv __unused ) {
  45
  46         if ( argc == 1 ) {
  47                 exit_flag = 1;
  48         } else {
  49                 printf ( "Usage: exit\n"
  50                          "Exits the command shell\n" );
  51         }
  52
  53         return 0;
  54 }
  55
  56 /** "exit" command definition */
  57 struct command exit_command __command = {
  58         .name = "exit",
  59         .exec = exit_exec,
  60 };
  61
  62 /** "help" command body */
  63 static int help_exec ( int argc __unused, char **argv __unused ) {
  64         struct command *command;
  65         unsigned int hpos = 0;
  66
  67         printf ( "\nAvailable commands:\n\n" );
  68         for ( command = commands ; command < commands_end ; command++ ) {
  69                 hpos += printf ( "  %s", command->name );
  70                 if ( hpos > ( 16 * 4 ) ) {
  71                         printf ( "\n" );
  72                         hpos = 0;
  73                 } else {
  74                         while ( hpos % 16 ) {
  75                                 printf ( " " );
  76                                 hpos++;
  77                         }
  78                 }
  79         }
  80         printf ( "\n\nType \"<command> --help\" for further information\n\n" );
  81         return 0;
  82 }
  83
  84 /** "help" command definition */
  85 struct command help_command __command = {
  86         .name = "help",
  87         .exec = help_exec,
  88 };
  89
  90 /**
  91  * Start command shell
  92  *
  93  */
  94 void shell ( void ) {
  95         char *line;
  96
  97         exit_flag = 0;
  98         while ( ! exit_flag ) {
  99                 line = readline ( shell_prompt );
 100                 if ( line ) {
 101                         system ( line );
 102                         free ( line );
 103                 }
 104         }
 105 }