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 */
exit_exec(int argc,char ** argv __unused)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 */
help_exec(int argc __unused,char ** argv __unused)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 */
shell(void)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 }
103