u-boot/common/cmd_help.c

/*
 * Copyright 2000-2009
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 (at your option) 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>

static int do_help(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	cmd_tbl_t *start = ll_entry_start(cmd_tbl_t, cmd);
	const int len = ll_entry_count(cmd_tbl_t, cmd);
	return _do_help(start, len, cmdtp, flag, argc, argv);
}

U_BOOT_CMD(
	help,	CONFIG_SYS_MAXARGS,	1,	do_help,
	"print command description/usage",
	"\n"
	"	- print brief description of all commands\n"
	"help command ...\n"
	"	- print detailed usage of 'command'"
);

/* This does not use the U_BOOT_CMD macro as ? can't be used in symbol names */
ll_entry_declare(cmd_tbl_t, question_mark, cmd) = {
	"?",	CONFIG_SYS_MAXARGS,	1,	do_help,
	"alias for 'help'",
#ifdef  CONFIG_SYS_LONGHELP
	""
#endif /* CONFIG_SYS_LONGHELP */
};