/****************************************************************************
 * apps/nshlib/nsh_command.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <string.h>
#include <assert.h>

#ifdef CONFIG_NSH_BUILTIN_APPS
#  include <nuttx/lib/builtin.h>
#endif

#if defined(CONFIG_SYSTEM_READLINE) && defined(CONFIG_READLINE_HAVE_EXTMATCH)
#  include "system/readline.h"
#endif

#include "nsh.h"
#include "nsh_console.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Help command summary layout */

#define HELP_LINELEN  80
#define NUM_CMDS      ((sizeof(g_cmdmap)/sizeof(struct cmdmap_s)) - 1)

/****************************************************************************
 * Private Types
 ****************************************************************************/

struct cmdmap_s
{
  FAR const char *cmd;    /* Name of the command */
  nsh_cmd_t   handler;    /* Function that handles the command */
  uint8_t     minargs;    /* Minimum number of arguments (including command) */
  uint8_t     maxargs;    /* Maximum number of arguments (including command) */
  FAR const char *usage;  /* Usage instructions for 'help' command */
};

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static int  cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
#endif

#ifndef CONFIG_NSH_DISABLESCRIPT
static int  cmd_true(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
static int  cmd_false(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
#endif

#ifndef CONFIG_NSH_DISABLE_EXIT
static int  cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
#endif

static int  cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc,
                             char **argv);

/****************************************************************************
 * Private Data
 ****************************************************************************/

static const struct cmdmap_s g_cmdmap[] =
{
#if defined(CONFIG_FILE_STREAM) && !defined(CONFIG_NSH_DISABLESCRIPT)
# ifndef CONFIG_NSH_DISABLE_SOURCE
  { ".",        cmd_source,   2, 2, "<script-path>" },
# endif
#endif

#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)
  { "[",        cmd_lbracket, 4, CONFIG_NSH_MAXARGUMENTS, "<expression> ]" },
#endif

#ifndef CONFIG_NSH_DISABLE_HELP
  { "?",        cmd_help,     1, 1, NULL },
#endif

#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE) && !defined(CONFIG_NSH_DISABLE_ADDROUTE)
  { "addroute", cmd_addroute, 3, 4, "<target> [<netmask>] <router>" },
#endif

#if defined(CONFIG_NET) && defined(CONFIG_NET_ARP) && !defined(CONFIG_NSH_DISABLE_ARP)
#ifdef CONFIG_NETLINK_ROUTE
  { "arp",      cmd_arp,      2, 4,
    "[-t|-a <ipaddr>|-d <ipaddr>|-s <ipaddr> <hwaddr>]" },
#else
  { "arp",      cmd_arp,      3, 4,
    "[-a <ipaddr>|-d <ipaddr>|-s <ipaddr> <hwaddr>]" },
#endif
#endif

#if defined(CONFIG_NETUTILS_CODECS) && defined(CONFIG_CODECS_BASE64)
#  ifndef CONFIG_NSH_DISABLE_BASE64DEC
  { "base64dec", cmd_base64decode, 2, 4, "[-w] [-f] <string or filepath>" },
#  endif
#  ifndef CONFIG_NSH_DISABLE_BASE64ENC
  { "base64enc", cmd_base64encode, 2, 4, "[-w] [-f] <string or filepath>" },
#  endif
#endif

#ifndef CONFIG_NSH_DISABLE_BASENAME
  { "basename",  cmd_basename, 2, 3, "<path> [<suffix>]" },
#endif

#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
  { "break",     cmd_break,   1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_CAT
  { "cat",      cmd_cat,      2, CONFIG_NSH_MAXARGUMENTS,
    "<path> [<path> [<path> ...]]" },
#endif

#ifndef CONFIG_DISABLE_ENVIRON
# ifndef CONFIG_NSH_DISABLE_CD
  { "cd",       cmd_cd,       1, 2, "[<dir-path>|-|~|..]" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_CP
  { "cp",       cmd_cp,       3, 3, "<source-path> <dest-path>" },
#endif

#ifndef CONFIG_NSH_DISABLE_CMP
  { "cmp",      cmd_cmp,      3, 3, "<path1> <path2>" },
#endif

#ifndef CONFIG_NSH_DISABLE_DIRNAME
  { "dirname",  cmd_dirname,  2, 2, "<path>" },
#endif

#ifndef CONFIG_NSH_DISABLE_DATE
  { "date",     cmd_date,     1, 3, "[-s \"MMM DD HH:MM:SS YYYY\"]" },
#endif

#ifndef CONFIG_NSH_DISABLE_DD
  { "dd",       cmd_dd,       3, 6,
    "if=<infile> of=<outfile> [bs=<sectsize>] [count=<sectors>] "
    "[skip=<sectors>]" },
# endif

#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE) && !defined(CONFIG_NSH_DISABLE_DELROUTE)
  { "delroute", cmd_delroute, 2, 3, "<target> [<netmask>]" },
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && !defined(CONFIG_NSH_DISABLE_DF)
#ifdef NSH_HAVE_CATFILE
#if defined(HAVE_DF_HUMANREADBLE) && defined(HAVE_DF_BLOCKOUTPUT)
  { "df",       cmd_df,       1, 2, "[-h]" },
#else
  { "df",       cmd_df,       1, 1, NULL },
#endif
#endif
#endif

#if defined(CONFIG_RAMLOG_SYSLOG) && !defined(CONFIG_NSH_DISABLE_DMESG)
  { "dmesg",    cmd_dmesg,    1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_ECHO
# ifndef CONFIG_DISABLE_ENVIRON
  { "echo",     cmd_echo,     1, CONFIG_NSH_MAXARGUMENTS,
    "[-n] [<string|$name> [<string|$name>...]]" },
# else
  { "echo",     cmd_echo,     1, CONFIG_NSH_MAXARGUMENTS,
    "[-n] [<string> [<string>...]]" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_ENV
  { "env",      cmd_env,      1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_EXEC
  { "exec",     cmd_exec,     2, 3, "<hex-address>" },
#endif

#ifndef CONFIG_NSH_DISABLE_EXIT
  { "exit",     cmd_exit,     1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_EXPORT
  { "export",   cmd_export,   2, 3, "[<name> [<value>]]" },
#endif

#ifndef CONFIG_NSH_DISABLESCRIPT
  { "false",    cmd_false,    1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_FREE
  { "free",     cmd_free,     1, 1, NULL },
#endif

#ifdef CONFIG_NET_UDP
# ifndef CONFIG_NSH_DISABLE_GET
  { "get",      cmd_get,      4, 7,
    "[-b|-n] [-f <local-path>] -h <ip-address> <remote-path>" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_HELP
# ifdef CONFIG_NSH_HELP_TERSE
  { "help",     cmd_help,     1, 2, "[<cmd>]" },
#else
  { "help",     cmd_help,     1, 3, "[-v] [<cmd>]" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_HEXDUMP
#ifndef CONFIG_NSH_CMDOPT_HEXDUMP
  { "hexdump",  cmd_hexdump,  2, 2, "<file or device>" },
#else
  { "hexdump",  cmd_hexdump,  2, 4,
    "<file or device> [skip=<bytes>] [count=<bytes>]" },
#endif
#endif

#ifdef CONFIG_NET
# ifndef CONFIG_NSH_DISABLE_IFCONFIG
  { "ifconfig", cmd_ifconfig, 1, 11,
    "[interface [<ip-address>|dhcp]] [dr|gw|gateway <dr-address>] "
    "[netmask <net-mask>] [dns <dns-address>] [hw <hw-mac>]" },
# endif
# ifndef CONFIG_NSH_DISABLE_IFUPDOWN
  { "ifdown",   cmd_ifdown,   2, 2, "<interface>" },
  { "ifup",     cmd_ifup,     2, 2, "<interface>" },
# endif
#endif

#if defined(CONFIG_MODULE) && !defined(CONFIG_NSH_DISABLE_MODCMDS)
  { "insmod",   cmd_insmod,   3, 3, "<file-path> <module-name>" },
#endif

#ifdef HAVE_IRQINFO
  { "irqinfo",  cmd_irqinfo,  1, 1, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_KILL
  { "kill",     cmd_kill,     3, 3, "-<signal> <pid>" },
#endif

#ifndef CONFIG_DISABLE_MOUNTPOINT
# if defined(CONFIG_DEV_LOOP) && !defined(CONFIG_NSH_DISABLE_LOSETUP)
  { "losetup",   cmd_losetup, 3, 6,
    "[-d <dev-path>] | [[-o <offset>] [-r] <dev-path> <file-path>]" },
# endif
#endif

#ifndef CONFIG_DISABLE_MOUNTPOINT
# if defined(CONFIG_SMART_DEV_LOOP) && !defined(CONFIG_NSH_DISABLE_LOSMART)
  { "losmart",   cmd_losmart, 2, 11,
    "[-d <dev-path>] | [[-m <minor>] [-o <offset>] [-e <erase-size>] "
    "[-s <sect-size>] [-r] <file-path>]" },
# endif
#endif

#if !defined(CONFIG_NSH_DISABLE_LN) && defined(CONFIG_PSEUDOFS_SOFTLINKS)
  { "ln",       cmd_ln,       3, 4, "[-s] <target> <link>" },
#endif

#ifndef CONFIG_NSH_DISABLE_LS
  { "ls",       cmd_ls,       1, 5, "[-lRs] <dir-path>" },
#endif

#if defined(CONFIG_MODULE) && !defined(CONFIG_NSH_DISABLE_MODCMDS)
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
  { "lsmod",    cmd_lsmod,    1, 1,  NULL },
#endif
#endif

#ifndef CONFIG_NSH_DISABLE_MB
  { "mb",       cmd_mb,       2, 3,
    "<hex-address>[=<hex-value>] [<hex-byte-count>]" },
#endif

#if defined(CONFIG_NETUTILS_CODECS) && defined(CONFIG_CODECS_HASH_MD5)
#  ifndef CONFIG_NSH_DISABLE_MD5
  { "md5",      cmd_md5,      2, 3, "[-f] <string or filepath>" },
#  endif
#endif

#ifdef NSH_HAVE_DIROPTS
# ifndef CONFIG_NSH_DISABLE_MKDIR
  { "mkdir",    cmd_mkdir,    2, 2, "<path>" },
# endif
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FSUTILS_MKFATFS)
# ifndef CONFIG_NSH_DISABLE_MKFATFS
  { "mkfatfs",  cmd_mkfatfs,  2, 6,
    "[-F <fatsize>] [-r <rootdirentries>] <block-driver>" },
# endif
#endif

#ifndef CONFIG_DISABLE_MOUNTPOINT
# if defined(CONFIG_PIPES) && CONFIG_DEV_FIFO_SIZE > 0 && \
    !defined(CONFIG_NSH_DISABLE_MKFIFO)
  { "mkfifo",   cmd_mkfifo,   2, 2, "<path>" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_MKRD
  { "mkrd",     cmd_mkrd,     2, 6,
    "[-m <minor>] [-s <sector-size>] <nsectors>" },
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_SMARTFS) && \
    defined(CONFIG_FSUTILS_MKSMARTFS)
# ifndef CONFIG_NSH_DISABLE_MKSMARTFS
#  ifdef CONFIG_SMARTFS_MULTI_ROOT_DIRS
  { "mksmartfs",  cmd_mksmartfs,  2, 6,
    "[-s <sector-size>] [-f] <path> [<num-root-directories>]" },
#  else
  { "mksmartfs",  cmd_mksmartfs,  2, 5, "[-s <sector-size>] [-f] <path>" },
#  endif
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_MH
  { "mh",       cmd_mh,       2, 3,
    "<hex-address>[=<hex-value>] [<hex-byte-count>]" },
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT)
#ifndef CONFIG_NSH_DISABLE_MOUNT
#if defined(NSH_HAVE_CATFILE) && defined(HAVE_MOUNT_LIST)
  { "mount",    cmd_mount,    1, 7,
    "[-t <fstype> [-o <options>] [<block-device>] <mount-point>]" },
#else
  { "mount",    cmd_mount,    4, 7,
    "-t <fstype> [-o <options>] [<block-device>] <mount-point>" },
#endif
#endif
#endif

#ifdef NSH_HAVE_DIROPTS
#  ifndef CONFIG_NSH_DISABLE_MV
  { "mv",       cmd_mv,       3, 3, "<old-path> <new-path>" },
#  endif
#endif

#ifndef CONFIG_NSH_DISABLE_MW
  { "mw",       cmd_mw,       2, 3,
    "<hex-address>[=<hex-value>] [<hex-byte-count>]" },
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_NET) && \
    defined(CONFIG_NFS)
#  ifndef CONFIG_NSH_DISABLE_NFSMOUNT
  { "nfsmount", cmd_nfsmount, 4, 5,
    "<server-address> <mount-point> <remote-path> [udp]" },
#  endif
#endif

#if defined(CONFIG_LIBC_NETDB) && !defined(CONFIG_NSH_DISABLE_NSLOOKUP)
  { "nslookup", cmd_nslookup, 2, 2, "<host-name>" },
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && \
     defined(CONFIG_NSH_LOGIN_PASSWD) && \
    !defined(CONFIG_FSUTILS_PASSWD_READONLY)
#  ifndef CONFIG_NSH_DISABLE_PASSWD
  { "passwd",   cmd_passwd,   3, 3, "<username> <password>" },
#  endif
#endif

#if defined(CONFIG_PM) && !defined(CONFIG_NSH_DISABLE_PMCONFIG)
  { "pmconfig", cmd_pmconfig,  1, 3,
    "[stay|relax] [normal|idle|standby|sleep]" },
#endif

#if defined(CONFIG_BOARDCTL_POWEROFF) && !defined(CONFIG_NSH_DISABLE_POWEROFF)
  { "poweroff", cmd_poweroff,  1, 2, NULL },
#endif

#ifndef CONFIG_NSH_DISABLE_PRINTF
# ifndef CONFIG_DISABLE_ENVIRON
  { "printf",   cmd_printf,   1, CONFIG_NSH_MAXARGUMENTS,
    "[\\xNN] [\\n\\r\\t] [<string|$name> [<string|$name>...]]" },
# else
  { "printf",   cmd_printf,   1, CONFIG_NSH_MAXARGUMENTS,
    "[\\xNN] [\\n\\r\\t] [<string> [<string>...]]" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_PS
  { "ps",       cmd_ps,       1, 1, NULL },
#endif

#ifdef CONFIG_NET_UDP
# ifndef CONFIG_NSH_DISABLE_PUT
  { "put",      cmd_put,      4, 7,
    "[-b|-n] [-f <remote-path>] -h <ip-address> <local-path>" },
# endif
#endif

#ifndef CONFIG_DISABLE_ENVIRON
# ifndef CONFIG_NSH_DISABLE_PWD
  { "pwd",      cmd_pwd,      1, 1, NULL },
# endif
#endif

#if !defined(CONFIG_NSH_DISABLE_READLINK) && defined(CONFIG_PSEUDOFS_SOFTLINKS)
  { "readlink", cmd_readlink, 2, 2, "<link>" },
#endif

#if defined(CONFIG_BOARDCTL_RESET) && !defined(CONFIG_NSH_DISABLE_REBOOT)
  { "reboot",   cmd_reboot,   1, 2, NULL },
#endif

#ifdef NSH_HAVE_DIROPTS
# ifndef CONFIG_NSH_DISABLE_RM
  { "rm",       cmd_rm,       2, 2, "<file-path>" },
# endif
#endif

#ifdef NSH_HAVE_DIROPTS
# ifndef CONFIG_NSH_DISABLE_RMDIR
  { "rmdir",    cmd_rmdir,    2, 2, "<dir-path>" },
# endif
#endif

#if defined(CONFIG_MODULE) && !defined(CONFIG_NSH_DISABLE_MODCMDS)
  { "rmmod",    cmd_rmmod,    2, 2, "<module-name>" },
#endif

#ifndef CONFIG_NSH_DISABLE_ROUTE
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
  { "route",    cmd_route,    2, 2, "ipv4|ipv6" },
#elif defined(CONFIG_NET_IPv4)
  { "route",    cmd_route,    1, 2, "[ipv4]" },
#elif defined(CONFIG_NET_IPv6)
  { "route",    cmd_route,    1, 2, "[ipv6]" },
#endif
#endif

#if defined(CONFIG_RPTUN) && !defined(CONFIG_NSH_DISABLE_RPTUN)
  { "rptun",    cmd_rptun,    3, 3, "start|stop <dev-path>" },
#endif

#ifndef CONFIG_NSH_DISABLE_SET
#ifdef CONFIG_NSH_VARS
#  if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      1, 4, "[{+|-}{e|x|xe|ex}] [<name> <value>]" },
#  elif !defined(CONFIG_DISABLE_ENVIRON) && defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      1, 3, "[<name> <value>]" },
#  elif defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      1, 2, "[{+|-}{e|x|xe|ex}]" },
#  endif
#else
#  if !defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      2, 4, "[{+|-}{e|x|xe|ex}] [<name> <value>]" },
#  elif !defined(CONFIG_DISABLE_ENVIRON) && defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      3, 3, "<name> <value>" },
#  elif defined(CONFIG_DISABLE_ENVIRON) && !defined(CONFIG_NSH_DISABLESCRIPT)
  { "set",      cmd_set,      2, 2, "{+|-}{e|x|xe|ex}" },
#  endif
#endif
#endif /* CONFIG_NSH_DISABLE_SET */

#ifndef CONFIG_NSH_DISABLE_SHUTDOWN
#if defined(CONFIG_BOARDCTL_POWEROFF) && defined(CONFIG_BOARDCTL_RESET)
  { "shutdown", cmd_shutdown, 1, 2, "[--reboot]" },
#elif defined(CONFIG_BOARDCTL_POWEROFF)
  { "shutdown", cmd_shutdown, 1, 1, NULL },
#elif defined(CONFIG_BOARDCTL_RESET)
  { "shutdown", cmd_shutdown, 2, 2, "--reboot" },
#endif
#endif

#ifndef CONFIG_NSH_DISABLE_SLEEP
  { "sleep",    cmd_sleep,    2, 2, "<sec>" },
#endif

#if defined(CONFIG_FILE_STREAM) && !defined(CONFIG_NSH_DISABLESCRIPT)
# ifndef CONFIG_NSH_DISABLE_SOURCE
  { "source",   cmd_source,   2, 2, "<script-path>" },
# endif
#endif

#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)
  { "test",     cmd_test,     3, CONFIG_NSH_MAXARGUMENTS, "<expression>" },
#endif

#if defined(CONFIG_NSH_TELNET) && !defined(CONFIG_NSH_DISABLE_TELNETD)
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
  {"telnetd",   cmd_telnetd,  2, 2, "[ipv4|ipv6]" },
#else
  {"telnetd",   cmd_telnetd,  1, 1, NULL },
#endif
#endif

#ifndef CONFIG_NSH_DISABLE_TIME
  { "time",     cmd_time,     2, 2, "\"<command>\"" },
#endif

#ifndef CONFIG_NSH_DISABLESCRIPT
  { "true",     cmd_true,     1, 1, NULL },
#endif

#ifndef CONFIG_DISABLE_MOUNTPOINT
# ifndef CONFIG_NSH_DISABLE_TRUNCATE
  { "truncate", cmd_truncate, 4, 4, "-s <length> <file-path>" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_UNAME
#ifdef CONFIG_NET
  { "uname",    cmd_uname,    1, 7, "[-a | -imnoprsv]" },
#else
  { "uname",    cmd_uname,    1, 7, "[-a | -imoprsv]" },
#endif
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT)
# ifndef CONFIG_NSH_DISABLE_UMOUNT
  { "umount",   cmd_umount,   2, 2, "<dir-path>" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_UNSET
  { "unset",    cmd_unset,    2, 2, "<name>" },
#endif

#if defined(CONFIG_NETUTILS_CODECS) && defined(CONFIG_CODECS_URLCODE)
#  ifndef CONFIG_NSH_DISABLE_URLDECODE
  { "urldecode", cmd_urldecode, 2, 3, "[-f] <string or filepath>" },
#  endif
#  ifndef CONFIG_NSH_DISABLE_URLENCODE
  { "urlencode", cmd_urlencode, 2, 3, "[-f] <string or filepath>" },
#  endif
#endif

#if !defined(CONFIG_DISABLE_MOUNTPOINT) && \
     defined(CONFIG_NSH_LOGIN_PASSWD) && \
    !defined(CONFIG_FSUTILS_PASSWD_READONLY)
#  ifndef CONFIG_NSH_DISABLE_USERADD
  { "useradd",   cmd_useradd, 3, 3, "<username> <password>" },
#  endif
#  ifndef CONFIG_NSH_DISABLE_USERDEL
  { "userdel",   cmd_userdel, 2, 2, "<username>" },
#  endif
#endif

#ifndef CONFIG_NSH_DISABLE_USLEEP
  { "usleep",   cmd_usleep,   2, 2, "<usec>" },
#endif

#ifdef CONFIG_NET_TCP
# ifndef CONFIG_NSH_DISABLE_WGET
  { "wget",     cmd_wget,     2, 4, "[-o <local-path>] <url>" },
# endif
#endif

#ifndef CONFIG_NSH_DISABLE_XD
  { "xd",       cmd_xd,       3, 3, "<hex-address> <byte-count>" },
#endif
  { NULL,       NULL,         1, 1, NULL }
};

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: help_cmdlist
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static inline void help_cmdlist(FAR struct nsh_vtbl_s *vtbl)
{
  unsigned int colwidth;
  unsigned int cmdwidth;
  unsigned int cmdsperline;
  unsigned int ncmdrows;
  unsigned int i;
  unsigned int j;
  unsigned int k;

  /* Pick an optimal column width */

  for (k = 0, colwidth = 0; k < NUM_CMDS; k++)
    {
      cmdwidth = strlen(g_cmdmap[k].cmd);
      if (cmdwidth > colwidth)
        {
          colwidth = cmdwidth;
        }
    }

  colwidth += 2;

  /* Determine the number of commands to put on one line */

  if (colwidth > HELP_LINELEN)
    {
      cmdsperline = 1;
    }
  else
    {
      cmdsperline = HELP_LINELEN / colwidth;
    }

  /* Determine the total number of lines to output */

  ncmdrows = (NUM_CMDS + (cmdsperline - 1)) / cmdsperline;

  /* Print the command name in 'ncmdrows' rows with 'cmdsperline' commands
   * on each line.
   */

  for (i = 0; i < ncmdrows; i++)
    {
      nsh_output(vtbl, "  ");
      for (j = 0, k = i;
           j < cmdsperline && k < NUM_CMDS;
           j++, k += ncmdrows)
        {
          nsh_output(vtbl, "%s", g_cmdmap[k].cmd);

          for (cmdwidth = strlen(g_cmdmap[k].cmd);
               cmdwidth < colwidth;
               cmdwidth++)
            {
              nsh_output(vtbl, " ");
            }
        }

      nsh_output(vtbl, "\n");
    }
}
#endif

/****************************************************************************
 * Name: help_usage
 ****************************************************************************/

#if !defined(CONFIG_NSH_DISABLE_HELP) && !defined(CONFIG_NSH_HELP_TERSE)
static inline void help_usage(FAR struct nsh_vtbl_s *vtbl)
{
  nsh_output(vtbl, "NSH command forms:\n");
#ifndef CONFIG_NSH_DISABLEBG
  nsh_output(vtbl, "  [nice [-d <niceness>>]] <cmd> "
                   "[> <file>|>> <file>] [&]\n\n");
#else
  nsh_output(vtbl, "  <cmd> [> <file>|>> <file>]\n\n");
#endif
#ifndef CONFIG_NSH_DISABLESCRIPT
#ifndef CONFIG_NSH_DISABLE_ITEF
  nsh_output(vtbl, "OR\n");
  nsh_output(vtbl, "  if <cmd>\n");
  nsh_output(vtbl, "  then\n");
  nsh_output(vtbl, "    [sequence of <cmd>]\n");
  nsh_output(vtbl, "  else\n");
  nsh_output(vtbl, "    [sequence of <cmd>]\n");
  nsh_output(vtbl, "  fi\n\n");
#endif
#ifndef CONFIG_NSH_DISABLE_LOOPS
  nsh_output(vtbl, "OR\n");
  nsh_output(vtbl, "  while <cmd>\n");
  nsh_output(vtbl, "  do\n");
  nsh_output(vtbl, "    [sequence of <cmd>]\n");
  nsh_output(vtbl, "  done\n\n");
  nsh_output(vtbl, "OR\n");
  nsh_output(vtbl, "  until <cmd>\n");
  nsh_output(vtbl, "  do\n");
  nsh_output(vtbl, "    [sequence of <cmd>]\n");
  nsh_output(vtbl, "  done\n\n");
#endif
#endif
}
#endif

/****************************************************************************
 * Name: help_showcmd
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static void help_showcmd(FAR struct nsh_vtbl_s *vtbl,
                         FAR const struct cmdmap_s *cmdmap)
{
  if (cmdmap->usage)
    {
      nsh_output(vtbl, "  %s %s\n", cmdmap->cmd, cmdmap->usage);
    }
  else
    {
      nsh_output(vtbl, "  %s\n", cmdmap->cmd);
    }
}
#endif

/****************************************************************************
 * Name: help_cmd
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static int help_cmd(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd)
{
  FAR const struct cmdmap_s *cmdmap;

  /* Find the command in the command table */

  for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
    {
      /* Is this the one we are looking for? */

      if (strcmp(cmdmap->cmd, cmd) == 0)
        {
          /* Yes... show it */

          nsh_output(vtbl, "%s usage:", cmd);
          help_showcmd(vtbl, cmdmap);
          return OK;
        }
    }

  nsh_error(vtbl, g_fmtcmdnotfound, cmd);
  return ERROR;
}
#endif

/****************************************************************************
 * Name: help_allcmds
 ****************************************************************************/

#if !defined(CONFIG_NSH_DISABLE_HELP) && !defined(CONFIG_NSH_HELP_TERSE)
static inline void help_allcmds(FAR struct nsh_vtbl_s *vtbl)
{
  FAR const struct cmdmap_s *cmdmap;

  /* Show all of the commands in the command table */

  for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
    {
      help_showcmd(vtbl, cmdmap);
    }
}
#endif

/****************************************************************************
 * Name: help_builtins
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static inline void help_builtins(FAR struct nsh_vtbl_s *vtbl)
{
#ifdef CONFIG_NSH_BUILTIN_APPS
  FAR const struct builtin_s *builtin;
  unsigned int builtins_per_line;
  unsigned int num_builtin_rows;
  unsigned int builtin_width;
  unsigned int num_builtins;
  unsigned int column_width;
  unsigned int i;
  unsigned int j;
  unsigned int k;

  /* Count the number of built-in commands and get the optimal column width */

  num_builtins = 0;
  column_width = 0;

  for (i = 0; (builtin = builtin_for_index(i)) != NULL; i++)
    {
      if (builtin->main == NULL)
        {
          continue;
        }

      num_builtins++;

      builtin_width = strlen(builtin->name);
      if (builtin_width > column_width)
        {
          column_width = builtin_width;
        }
    }

  /* Skip the printing if no available built-in commands */

  if (num_builtins == 0)
    {
      return;
    }

  column_width += 2;

  /* Determine the number of commands to put on one line */

  if (column_width > HELP_LINELEN)
    {
      builtins_per_line = 1;
    }
  else
    {
      builtins_per_line = HELP_LINELEN / column_width;
    }

  /* Determine the total number of lines to output */

  num_builtin_rows = ((num_builtins + (builtins_per_line - 1)) /
                      builtins_per_line);

  /* List the set of available built-in commands */

  nsh_output(vtbl, "\nBuiltin Apps:\n");
  for (i = 0; i < num_builtin_rows; i++)
    {
      nsh_output(vtbl, "  ");
      for (j = 0, k = i;
           j < builtins_per_line &&
           (builtin = builtin_for_index(k));
           j++, k += num_builtin_rows)
        {
          if (builtin->main == NULL)
            {
              continue;
            }

          nsh_output(vtbl, "%s", builtin->name);

          for (builtin_width = strlen(builtin->name);
               builtin_width < column_width;
               builtin_width++)
            {
              nsh_output(vtbl, " ");
            }
        }

      nsh_output(vtbl, "\n");
    }
#endif
}
#endif

/****************************************************************************
 * Name: cmd_help
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_HELP
static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
  FAR const char *cmd = NULL;
#ifndef CONFIG_NSH_HELP_TERSE
  bool verbose = false;
  int i;
#endif

  /* The command may be followed by a verbose option */

#ifndef CONFIG_NSH_HELP_TERSE
  i = 1;
  if (argc > i)
    {
      if (strcmp(argv[i], "-v") == 0)
        {
          verbose = true;
          i++;
        }
    }

  /* The command line may end with a command name */

  if (argc > i)
    {
      cmd = argv[i];
    }

  /* Show the generic usage if verbose is requested */

  if (verbose)
    {
      help_usage(vtbl);
    }
#else
  if (argc > 1)
    {
      cmd = argv[1];
    }
#endif

  /* Are we showing help on a single command? */

  if (cmd)
    {
      /* Yes.. show the single command */

      help_cmd(vtbl, cmd);
    }
  else
    {
      /* In verbose mode, show detailed help for all commands */

#ifndef CONFIG_NSH_HELP_TERSE
      if (verbose)
        {
          nsh_output(vtbl, "Where <cmd> is one of:\n");
          help_allcmds(vtbl);
        }

      /* Otherwise, just show the list of command names */

      else
#endif
        {
          help_cmd(vtbl, "help");
          nsh_output(vtbl, "\n");
          help_cmdlist(vtbl);
        }

      /* And show the list of built-in applications */

      help_builtins(vtbl);
    }

  return OK;
}
#endif

/****************************************************************************
 * Name: cmd_unrecognized
 ****************************************************************************/

static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc,
                            char **argv)
{
  nsh_error(vtbl, g_fmtcmdnotfound, argv[0]);
  return ERROR;
}

/****************************************************************************
 * Name: cmd_true
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLESCRIPT
static int cmd_true(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
  return OK;
}

#endif

/****************************************************************************
 * Name: cmd_false
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLESCRIPT
static int cmd_false(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
  return ERROR;
}
#endif

/****************************************************************************
 * Name: cmd_exit
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_EXIT
static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
  nsh_exit(vtbl, 0);
  return OK;
}
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nsh_command
 *
 * Description:
 *   Execute the command in argv[0]
 *
 * Returned Value:
 *   -1 (ERROR) if the command was unsuccessful
 *    0 (OK)     if the command was successful
 *
 ****************************************************************************/

int nsh_command(FAR struct nsh_vtbl_s *vtbl, int argc, char *argv[])
{
  const struct cmdmap_s *cmdmap;
  const char            *cmd;
  nsh_cmd_t              handler = cmd_unrecognized;
  int                    ret;

  /* The form of argv is:
   *
   * argv[0]:      The command name.  This is argv[0] when the arguments
   *               are, finally, received by the command vtblr
   * argv[1]:      The beginning of argument (up to CONFIG_NSH_MAXARGUMENTS)
   * argv[argc]:   NULL terminating pointer
   */

  cmd = argv[0];

  /* See if the command is one that we understand */

  for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
    {
      if (strcmp(cmdmap->cmd, cmd) == 0)
        {
          /* Check if a valid number of arguments was provided.  We
           * do this simple, imperfect checking here so that it does
           * not have to be performed in each command.
           */

          if (argc < cmdmap->minargs)
            {
              /* Fewer than the minimum number were provided */

              nsh_error(vtbl, g_fmtargrequired, cmd);
              return ERROR;
            }
          else if (argc > cmdmap->maxargs)
            {
              /* More than the maximum number were provided */

              nsh_error(vtbl, g_fmttoomanyargs, cmd);
              return ERROR;
            }
          else
            {
              /* A valid number of arguments were provided (this does
               * not mean they are right).
               */

              handler = cmdmap->handler;
              break;
            }
        }
    }

  ret = handler(vtbl, argc, argv);
  return ret;
}

/****************************************************************************
 * Name: nsh_extmatch_count
 *
 * Description:
 *   This support function is used to provide support for realine tab-
 *   completion logic  nsh_extmatch_count() counts the number of matching
 *   nsh command names
 *
 * Input Parameters:
 *   name    - A point to the name containing the name to be matched.
 *   matches - A table is size CONFIG_READLINE_MAX_EXTCMDS that can
 *             be used to remember matching name indices.
 *   namelen - The length of the name to match
 *
 * Returned Values:
 *   The number commands that match to the first namelen characters.
 *
 ****************************************************************************/

#if defined(CONFIG_NSH_READLINE) && defined(CONFIG_READLINE_TABCOMPLETION) && \
    defined(CONFIG_READLINE_HAVE_EXTMATCH)
int nsh_extmatch_count(FAR char *name, FAR int *matches, int namelen)
{
  int nr_matches = 0;
  int i;

  for (i = 0; i < NUM_CMDS; i++)
    {
      if (strncmp(name, g_cmdmap[i].cmd, namelen) == 0)
        {
          matches[nr_matches] = i;
          nr_matches++;

          if (nr_matches >= CONFIG_READLINE_MAX_EXTCMDS)
            {
              break;
            }
        }
    }

  return nr_matches;
}
#endif

/****************************************************************************
 * Name: nsh_extmatch_getname
 *
 * Description:
 *   This support function is used to provide support for realine tab-
 *   completion logic  nsh_extmatch_getname() will return the full command
 *   string from an index that was previously saved by nsh_exmatch_count().
 *
 * Input Parameters:
 *   index - The index of the command name to be returned.
 *
 * Returned Values:
 *   The numb
 *
 ****************************************************************************/

#if defined(CONFIG_NSH_READLINE) && defined(CONFIG_READLINE_TABCOMPLETION) && \
    defined(CONFIG_READLINE_HAVE_EXTMATCH)
FAR const char *nsh_extmatch_getname(int index)
{
  DEBUGASSERT(index > 0 && index <= NUM_CMDS);
  return  g_cmdmap[index].cmd;
}
#endif