shell.c

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/*
 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <readline/readline.h>
#include <ipxe/command.h>
#include <ipxe/parseopt.h>
#include <ipxe/shell.h>
#include <config/branding.h>

/** @file
 *
 * Minimal command shell
 *
 */

/** The shell prompt string */
static const char shell_prompt[] = PRODUCT_SHORT_NAME "> ";

/**
 * "help" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Return status code
 */
static int help_exec ( int argc __unused, char **argv __unused ) {
        struct command *command;
        unsigned int hpos = 0;

        printf ( "\nAvailable commands:\n\n" );
        for_each_table_entry ( command, COMMANDS ) {
                hpos += printf ( "  %s", command->name );
                if ( hpos > ( 16 * 4 ) ) {
                        printf ( "\n" );
                        hpos = 0;
                } else {
                        while ( hpos % 16 ) {
                                printf ( " " );
                                hpos++;
                        }
                }
        }
        printf ( "\n\nType \"<command> --help\" for further information\n\n" );
        return 0;
}

/** "help" command */
struct command help_command __command = {
        .name = "help",
        .exec = help_exec,
};

/**
 * Start command shell
 *
 */
int shell ( void ) {
        struct readline_history history;
        char *line;
        int rc = 0;

        /* Initialise shell history */
        memset ( &history, 0, sizeof ( history ) );

        /* Read and execute commands */
        do {
                readline_history ( shell_prompt, NULL, &history, 0, &line );
                if ( line ) {
                        rc = system ( line );
                        free ( line );
                }
        } while ( ! shell_stopped ( SHELL_STOP_COMMAND_SEQUENCE ) );

        /* Discard shell history */
        history_free ( &history );

        return rc;
}

/** "shell" options */
struct shell_options {};

/** "shell" option list */
static struct option_descriptor shell_opts[] = {};

/** "shell" command descriptor */
static struct command_descriptor shell_cmd =
        COMMAND_DESC ( struct shell_options, shell_opts, 0, 0, NULL );

/**
 * "shell" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Return status code
 */
static int shell_exec ( int argc, char **argv ) {
        struct shell_options opts;
        int rc;

        /* Parse options */
        if ( ( rc = parse_options ( argc, argv, &shell_cmd, &opts ) ) != 0 )
                return rc;

        /* Start shell */
        if ( ( rc = shell() ) != 0 )
                return rc;

        return 0;
}

/** "shell" command */
struct command shell_command __command = {
        .name = "shell",
        .exec = shell_exec,
};