cmd/help.c

   1 /*
   2  * Copyright 2000-2009
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10
  11 static int do_help(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  12 {
  13 #ifdef CONFIG_CMDLINE
  14         cmd_tbl_t *start = ll_entry_start(cmd_tbl_t, cmd);
  15         const int len = ll_entry_count(cmd_tbl_t, cmd);
  16         return _do_help(start, len, cmdtp, flag, argc, argv);
  17 #else
  18         return 0;
  19 #endif
  20 }
  21
  22 U_BOOT_CMD(
  23         help,   CONFIG_SYS_MAXARGS,     1,      do_help,
  24         "print command description/usage",
  25         "\n"
  26         "       - print brief description of all commands\n"
  27         "help command ...\n"
  28         "       - print detailed usage of 'command'"
  29 );
  30
  31 /* This does not use the U_BOOT_CMD macro as ? can't be used in symbol names */
  32 ll_entry_declare(cmd_tbl_t, question_mark, cmd) = {
  33         "?",    CONFIG_SYS_MAXARGS,     1,      do_help,
  34         "alias for 'help'",
  35 #ifdef  CONFIG_SYS_LONGHELP
  36         ""
  37 #endif /* CONFIG_SYS_LONGHELP */
  38 };