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      1 /*
      2  * Copyright (C) 2006 Michael Brown <mbrown (at) 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 }
    103