/****************************************************************************
 * apps/nshlib/nsh_syscmds.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 <nuttx/power/pm.h>
#include <nuttx/rptun/rptun.h>
#include <nuttx/streams.h>
#include <sys/boardctl.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

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

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

#ifdef CONFIG_ARCH_BOARD_CUSTOM
#  ifndef CONFIG_ARCH_BOARD_CUSTOM_NAME
#    define BOARD_NAME g_unknown
#  else
#    define BOARD_NAME CONFIG_ARCH_BOARD_CUSTOM_NAME
#  endif
#else
#  ifndef CONFIG_ARCH_BOARD
#    define BOARD_NAME g_unknown
#  else
#    define BOARD_NAME CONFIG_ARCH_BOARD
#  endif
#endif

#define UNAME_KERNEL   (1 << 0)
#define UNAME_NODE     (1 << 1)
#define UNAME_RELEASE  (1 << 2)
#define UNAME_VERSION  (1 << 3)
#define UNAME_MACHINE  (1 << 4)
#define UNAME_PLATFORM (1 << 5)
#define UNAME_UNKNOWN  (1 << 6)

#ifdef CONFIG_NET
#  define UNAME_ALL    (UNAME_KERNEL | UNAME_NODE | UNAME_RELEASE | \
                        UNAME_VERSION | UNAME_MACHINE | UNAME_PLATFORM)
#else
#  define UNAME_ALL    (UNAME_KERNEL | UNAME_RELEASE | UNAME_VERSION | \
                        UNAME_MACHINE | UNAME_PLATFORM)
#endif

#ifndef CONFIG_NSH_PROC_MOUNTPOINT
#  define CONFIG_NSH_PROC_MOUNTPOINT "/proc"
#endif

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

#ifndef CONFIG_NSH_DISABLE_UNAME
static const char g_unknown[] = "unknown";
#endif

#if defined(CONFIG_BOARDCTL_RESET_CAUSE) && !defined(CONFIG_NSH_DISABLE_RESET_CAUSE)

/* Keep update with nuttx kernel definition */

static FAR const char *const g_resetcause[] =
{
  "none",
  "power_on",
  "rtc_watchdog",
  "brown_out",
  "core_soft_reset",
  "core_deep_sleep",
  "core_main_watchdog",
  "core_rtc_watchdog",
  "cpu_main_watchdog",
  "cpu_soft_reset",
  "cpu_rtc_watchdog",
  "pin",
  "lowpower",
  "unkown"
};
#endif

#if (defined(CONFIG_BOARDCTL_RESET) && !defined(CONFIG_NSH_DISABLE_REBOOT)) || \
    (defined(CONFIG_BOARDCTL_RESET_CAUSE) && !defined(CONFIG_NSH_DISABLE_RESET_CAUSE))
static FAR const char * const g_resetflag[] =
{
  "reboot",
  "assert",
  "panic",
  "bootloader",
  "recovery",
  "factory",
  NULL
};
#endif

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

#if defined(CONFIG_RPMSG) && !defined(CONFIG_NSH_DISABLE_RPMSG)
typedef CODE int (*cmd_rpmsg_cb_t)(FAR int *cmd, FAR unsigned long * val,
                                   FAR char **argv);
#endif

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

/****************************************************************************
 * Name: cmd_shutdown
 ****************************************************************************/

#if (defined(CONFIG_BOARDCTL_POWEROFF) || defined(CONFIG_BOARDCTL_RESET)) && \
    !defined(CONFIG_NSH_DISABLE_SHUTDOWN)

int cmd_shutdown(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
#if defined(CONFIG_BOARDCTL_POWEROFF) && defined(CONFIG_BOARDCTL_RESET)
  /* If both shutdown and reset are supported, then a single option may
   * be provided to select the reset behavior (--reboot).  We know here
   * that argc is either 1 or 2.
   */

  if (argc == 2)
    {
      /* Verify that the single argument is --reboot */

      if (strcmp(argv[1], "--reboot") != 0)
        {
          nsh_error(vtbl, g_fmtarginvalid, argv[0]);
          return ERROR;
        }

      /* Invoke the BOARDIOC_RESET board control to reset the board.  If
       * the board_reset() function returns, then it was not possible to
       * reset the board due to some constraints.
       */

      boardctl(BOARDIOC_RESET, 0);
    }
  else
    {
      /* Invoke the BOARDIOC_POWEROFF board control to shutdown the board.
       * If the board_power_off function returns, then it was not possible
       * to power-off the* board due to some constraints.
       */

      boardctl(BOARDIOC_POWEROFF, 0);
    }

#elif defined(CONFIG_BOARDCTL_RESET)
  /* Only reset behavior is supported and we already know that exactly one
   * argument has been provided.
   */

  /* Verify that the single argument is --reboot */

  if (strcmp(argv[1], "--reboot") != 0)
    {
      nsh_error(vtbl, g_fmtarginvalid, argv[0]);
      return ERROR;
    }

  /* Invoke the BOARDIOC_RESET board control to reset the board.  If
   * the board_reset() function returns, then it was not possible to
   * reset the board due to some constraints.
   */

  boardctl(BOARDIOC_RESET, 0);

#else
  /* Only the reset behavior is supported and we already know that there is
   * no argument to the command.
   */

  /* Invoke the BOARDIOC_POWEROFF board control to shutdown the board.  If
   * the board_power_off function returns, then it was not possible to power-
   * off the board due to some constraints.
   */

  boardctl(BOARDIOC_POWEROFF, 0);
#endif

  /* boardctl() will not return in any case.  It if does, it means that
   * there was a problem with the shutdown/reset operation.
   */

  nsh_error(vtbl, g_fmtcmdfailed, argv[0], "boardctl", NSH_ERRNO);
  return ERROR;
}
#endif /* CONFIG_BOARDCTL_POWEROFF && !CONFIG_NSH_DISABLE_SHUTDOWN */

/****************************************************************************
 * Name: cmd_pmconfig
 ****************************************************************************/

#if defined(CONFIG_PM) && !defined(CONFIG_NSH_DISABLE_PMCONFIG)
static int cmd_pmconfig_recursive(FAR struct nsh_vtbl_s *vtbl,
                                  FAR const char *dirpath,
                                  FAR struct dirent *entryp,
                                  FAR void *pvarg)
{
  FAR char *path;
  int ret = ERROR;

  if (DIRENT_ISDIRECTORY(entryp->d_type))
    {
      return 0;
    }

  path = nsh_getdirpath(vtbl, dirpath, entryp->d_name);
  if (path)
    {
      nsh_output(vtbl, "\n%s:\n", path);
      ret = nsh_catfile(vtbl, pvarg, path);
      free(path);
    }

  return ret;
}

int cmd_pmconfig(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  struct boardioc_pm_ctrl_s ctrl =
  {
  };

  if (argc <= 2)
    {
      int next_state;
      int last_state;

      if (argc == 2)
        {
          ctrl.domain = atoi(argv[1]);
          if (ctrl.domain < 0 || ctrl.domain >= CONFIG_PM_NDOMAINS)
            {
              nsh_error(vtbl, g_fmtargrange, argv[1]);
              return ERROR;
            }
        }

      ctrl.action = BOARDIOC_PM_QUERYSTATE;
      boardctl(BOARDIOC_PM_CONTROL, (uintptr_t)&ctrl);
      last_state = ctrl.state;

      ctrl.action = BOARDIOC_PM_CHECKSTATE;
      boardctl(BOARDIOC_PM_CONTROL, (uintptr_t)&ctrl);
      next_state = ctrl.state;

      nsh_output(vtbl, "Last state %d, Next state %d\n",
                 last_state, next_state);

      return nsh_foreach_direntry(vtbl, argv[0],
                                  CONFIG_NSH_PROC_MOUNTPOINT "/pm",
                                  cmd_pmconfig_recursive, argv[0]);
    }
  else if (argc <= 4)
    {
      if (argc == 4)
        {
          ctrl.domain = atoi(argv[3]);
          if (ctrl.domain < 0 || ctrl.domain >= CONFIG_PM_NDOMAINS)
            {
              nsh_error(vtbl, g_fmtargrange, argv[3]);
              return ERROR;
            }
        }

      if (strcmp(argv[1], "stay") == 0)
        {
          ctrl.action = BOARDIOC_PM_STAY;
        }
      else if (strcmp(argv[1], "relax") == 0)
        {
          ctrl.action = BOARDIOC_PM_RELAX;
        }
      else
        {
          nsh_output(vtbl, g_fmtarginvalid, argv[1]);
          return ERROR;
        }

      if (strcmp(argv[2], "normal") == 0)
        {
          ctrl.state = PM_NORMAL;
        }
      else if (strcmp(argv[2], "idle") == 0)
        {
          ctrl.state = PM_IDLE;
        }
      else if (strcmp(argv[2], "standby") == 0)
        {
          ctrl.state = PM_STANDBY;
        }
      else if (strcmp(argv[2], "sleep") == 0)
        {
          ctrl.state = PM_SLEEP;
        }
      else
        {
          nsh_output(vtbl, g_fmtarginvalid, argv[2]);
          return ERROR;
        }

      boardctl(BOARDIOC_PM_CONTROL, (uintptr_t)&ctrl);
    }
  else
    {
      nsh_error(vtbl, g_fmttoomanyargs, argv[0]);
      return ERROR;
    }

  return 0;
}
#endif

/****************************************************************************
 * Name: cmd_poweroff
 ****************************************************************************/

#if defined(CONFIG_BOARDCTL_POWEROFF) && !defined(CONFIG_NSH_DISABLE_POWEROFF)
int cmd_poweroff(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  /* Invoke the BOARDIOC_POWEROFF board control to shutdown the board.  If
   * the board_power_off function returns, then it was not possible to power-
   * off the board due to some constraints.
   */

  if (argc > 1)
    {
      boardctl(BOARDIOC_POWEROFF, atoi(argv[1]));
    }
  else
    {
      boardctl(BOARDIOC_POWEROFF, 0);
    }

  /* boardctl() will not return in any case.  It if does, it means that
   * there was a problem with the shutdown operation.
   */

  nsh_error(vtbl, g_fmtcmdfailed, argv[0], "boardctl", NSH_ERRNO);
  return ERROR;
}
#endif

/****************************************************************************
 * Name: cmd_switchboot
 ****************************************************************************/

#if defined(CONFIG_BOARDCTL_SWITCH_BOOT) && !defined(CONFIG_NSH_DISABLE_SWITCHBOOT)
int cmd_switchboot(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  if (argc != 2)
    {
      nsh_output(vtbl, g_fmtarginvalid, argv[0]);
      return ERROR;
    }

  boardctl(BOARDIOC_SWITCH_BOOT, (uintptr_t)argv[1]);
  return 0;
}
#endif

/****************************************************************************
 * Name: cmd_boot
 ****************************************************************************/

#if defined(CONFIG_BOARDCTL_BOOT_IMAGE) && !defined(CONFIG_NSH_DISABLE_BOOT)
int cmd_boot(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  struct boardioc_boot_info_s info;

  memset(&info, 0, sizeof(info));

  /* Invoke the BOARDIOC_BOOT_IMAGE board control to reset the board.  If
   * the board_boot_image() function returns, then it was not possible to
   * boot the image due to some constraints.
   */

  switch (argc)
    {
      default:
        info.header_size = strtoul(argv[2], NULL, 0);

        /* Go through */

      case 1:
        info.path = argv[1];

        /* Go through */

      case 0:

        /* Nothing to do */

        break;
    }

  boardctl(BOARDIOC_BOOT_IMAGE, (uintptr_t)&info);

  /* boardctl() will not return in this case.  It if does, it means that
   * there was a problem with the boot operation.
   */

  nsh_error(vtbl, g_fmtcmdfailed, argv[0], "boardctl", NSH_ERRNO);
  return ERROR;
}
#endif

/****************************************************************************
 * Name: cmd_reboot
 ****************************************************************************/

#if defined(CONFIG_BOARDCTL_RESET) && !defined(CONFIG_NSH_DISABLE_REBOOT)
int cmd_reboot(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  /* Invoke the BOARDIOC_RESET board control to reset the board.  If
   * the board_reset() function returns, then it was not possible to
   * reset the board due to some constraints.
   */

  if (argc > 1)
    {
      int i = 0;

      while (g_resetflag[i] != NULL)
        {
          if (strcmp(g_resetflag[i], argv[1]) == 0)
            {
              break;
            }

          i++;
        }

      if (g_resetflag[i])
        {
          boardctl(BOARDIOC_RESET, i);
        }
      else
        {
          boardctl(BOARDIOC_RESET, atoi(argv[1]));
        }
    }
  else
    {
      boardctl(BOARDIOC_RESET, 0);
    }

  /* boardctl() will not return in this case.  It if does, it means that
   * there was a problem with the reset operation.
   */

  nsh_error(vtbl, g_fmtcmdfailed, argv[0], "boardctl", NSH_ERRNO);
  return ERROR;
}
#endif

#if defined(CONFIG_BOARDCTL_RESET_CAUSE) && !defined(CONFIG_NSH_DISABLE_RESET_CAUSE)
int cmd_reset_cause(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  UNUSED(argc);

  int ret;
  struct boardioc_reset_cause_s cause;

  memset(&cause, 0, sizeof(cause));
  ret = boardctl(BOARDIOC_RESET_CAUSE, (uintptr_t)&cause);
  if (ret < 0)
    {
      nsh_error(vtbl, g_fmtcmdfailed, argv[0], "boardctl", NSH_ERRNO);
      return ERROR;
    }

  if (cause.cause != BOARDIOC_RESETCAUSE_CPU_SOFT)
    {
      nsh_output(vtbl, "%s(%lu)\n",
             g_resetcause[cause.cause], cause.flag);
    }
  else
    {
      nsh_output(vtbl, "%s(%s)\n",
             g_resetcause[cause.cause], g_resetflag[cause.flag]);
    }

  return OK;
}
#endif

/****************************************************************************
 * Name: cmd_irq_affinity
 ****************************************************************************/

#if defined(CONFIG_BOARDCTL_IRQ_AFFINITY) && !defined(CONFIG_NSH_DISABLE_IRQ_AFFINITY)
int cmd_irq_affinity(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  unsigned int affinity[2];

  if (argc == 3)
    {
      affinity[0] = strtoul(argv[1], NULL, 0);
      affinity[1] = strtoul(argv[2], NULL, 0);

      if (affinity[1] == 0)
        {
          affinity[1] = 0x1;
        }

      return boardctl(BOARDIOC_IRQ_AFFINITY, (uintptr_t)affinity);
    }

  return ERROR;
}
#endif

/****************************************************************************
 * Name: cmd_rpmsg
 ****************************************************************************/

#if defined(CONFIG_RPMSG) && !defined(CONFIG_NSH_DISABLE_RPMSG)
static int cmd_rpmsg_once(FAR struct nsh_vtbl_s *vtbl,
                          FAR const char *path, FAR char **argv,
                          cmd_rpmsg_cb_t rpmsg_cb)
{
#ifdef CONFIG_RPMSG_PING
  struct rpmsg_ping_s ping;
#endif
  unsigned long val = 0;
  int cmd;
  int fd;

  if (strcmp(argv[1], "panic") == 0)
    {
      cmd = RPMSGIOC_PANIC;
    }
  else if (strcmp(argv[1], "dump") == 0)
    {
      cmd = RPMSGIOC_DUMP;
    }
#ifdef CONFIG_RPMSG_PING
  else if (strcmp(argv[1], "ping") == 0)
    {
      if (argv[3] == 0 || argv[4] == 0 ||
          argv[5] == 0 || argv[6] == 0)
        {
          nsh_error(vtbl, g_fmtargrequired, argv[0]);
          return ERROR;
        }

      ping.times = atoi(argv[3]);
      ping.len   = atoi(argv[4]);
      ping.ack   = atoi(argv[5]);
      ping.sleep = atoi(argv[6]);

      cmd = RPMSGIOC_PING;
      val = (unsigned long)&ping;
    }
#endif
  else if (rpmsg_cb && rpmsg_cb(&cmd, &val, argv) == OK)
    {
      /* Nothing */
    }
  else
    {
      nsh_output(vtbl, g_fmtarginvalid, argv[1]);
      return ERROR;
    }

  fd = open(path, 0);
  if (fd < 0)
    {
      nsh_output(vtbl, g_fmtarginvalid, path);
      return ERROR;
    }

  cmd = ioctl(fd, cmd, val);

  close(fd);

  return cmd;
}

static int cmd_rpmsg_recursive(FAR struct nsh_vtbl_s *vtbl,
                               FAR const char *dirpath,
                               FAR struct dirent *entryp,
                               FAR void *pvarg)
{
  FAR char *path;
  int ret = ERROR;

  if (DIRENT_ISDIRECTORY(entryp->d_type))
    {
      return 0;
    }

  path = nsh_getdirpath(vtbl, dirpath, entryp->d_name);
  if (path)
    {
      ret = cmd_rpmsg_once(vtbl, path, pvarg, NULL);
      free(path);
    }

  return ret;
}

static int cmd_rpmsg_help(FAR struct nsh_vtbl_s *vtbl, int argc,
                          FAR char **argv)
{
  nsh_output(vtbl, "%s <panic|dump> <path>\n", argv[0]);
#ifdef CONFIG_RPMSG_PING
  nsh_output(vtbl, "%s ping <path> <times> <length> <ack> "
             "<period(ms)>\n\n", argv[0]);
  nsh_output(vtbl, "<times>      Number of ping operations.\n");
  nsh_output(vtbl, "<length>     The length of each ping packet.\n");
  nsh_output(vtbl, "<ack>        Whether the peer acknowlege or "
             "check data.\n");
  nsh_output(vtbl, "             0 - No acknowledge and check.\n");
  nsh_output(vtbl, "             1 - Acknowledge, no data check.\n");
  nsh_output(vtbl, "             2 - Acknowledge and data check.\n");
  nsh_output(vtbl, "<sleep(ms)>  Sleep interval between two operations.\n");
#endif
  nsh_output(vtbl, "<path>       Rpmsg device path.\n\n");
  return OK;
}

int cmd_rpmsg(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  if (argc >= 2 && strcmp(argv[1], "-h") == 0)
    {
      nsh_output(vtbl, "usage:\n\n");
      return cmd_rpmsg_help(vtbl, argc, argv);
    }

  if (argc < 3)
    {
      nsh_output(vtbl, g_fmtargrequired, argv[0]);
      return ERROR;
    }

  if (strcmp(argv[2], "all") == 0)
    {
      return nsh_foreach_direntry(vtbl, "rpmsg", "/dev/rpmsg",
                                  cmd_rpmsg_recursive, argv);
    }

  return cmd_rpmsg_once(vtbl, argv[2], argv, NULL);
}
#endif

/****************************************************************************
 * Name: cmd_rptun
 ****************************************************************************/

#if defined(CONFIG_RPTUN) && !defined(CONFIG_NSH_DISABLE_RPTUN)
static int cmd_rptun_cb(FAR int *cmd, FAR unsigned long *val,
                        FAR char **argv)
{
  if (strcmp(argv[1], "start") == 0)
    {
      *cmd = RPTUNIOC_START;
    }
  else if (strcmp(argv[1], "stop") == 0)
    {
      *cmd = RPTUNIOC_STOP;
    }
  else if (strcmp(argv[1], "reset") == 0)
    {
      *val = atoi(argv[3]);
      *cmd = RPTUNIOC_RESET;
    }
  else
    {
      return ERROR;
    }

  return OK;
}

static int cmd_rptun_recursive(FAR struct nsh_vtbl_s *vtbl,
                               FAR const char *dirpath,
                               FAR struct dirent *entryp,
                               FAR void *pvarg)
{
  FAR char *path;
  int ret = ERROR;

  if (DIRENT_ISDIRECTORY(entryp->d_type))
    {
      return 0;
    }

  path = nsh_getdirpath(vtbl, dirpath, entryp->d_name);
  if (path)
    {
      ret = cmd_rpmsg_once(vtbl, path, pvarg, cmd_rptun_cb);
      free(path);
    }

  return ret;
}

int cmd_rptun(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  if (argc >= 2 && strcmp(argv[1], "-h") == 0)
    {
      nsh_output(vtbl, "usage:\n\n");
      nsh_output(vtbl, "rptun <start|stop> <path>\n");
      nsh_output(vtbl, "rptun <reset> <path> <resetvalue>\n");
      return cmd_rpmsg_help(vtbl, argc, argv);
    }

  if (argc < 3)
    {
      nsh_output(vtbl, g_fmtargrequired, argv[0]);
      return ERROR;
    }

  if (strcmp(argv[2], "all") == 0)
    {
      return nsh_foreach_direntry(vtbl, "rptun", "/dev/rptun",
                                  cmd_rptun_recursive, argv);
    }

  return cmd_rpmsg_once(vtbl, argv[2], argv, cmd_rptun_cb);
}
#endif

/****************************************************************************
 * Name: cmd_uname
 ****************************************************************************/

#ifndef CONFIG_NSH_DISABLE_UNAME
int cmd_uname(FAR struct nsh_vtbl_s *vtbl, int argc, FAR char **argv)
{
  FAR const char *str;
  struct lib_memoutstream_s stream;
  struct utsname info;
  struct utsname output;
  unsigned int set;
  int option;
  bool badarg;
  bool first;
  int ret;
  int i;

  /* Get the uname options */

  set    = 0;
  badarg = false;

  while ((option = getopt(argc, argv, "asonrvmpi")) != ERROR)
    {
      switch (option)
        {
          case 'a':
            set = UNAME_ALL;
            break;

          case 'o':
          case 's':
            set |= UNAME_KERNEL;
            break;

#ifdef CONFIG_NET
          case 'n':
            set |= UNAME_NODE;
            break;
#endif

          case 'r':
            set |= UNAME_RELEASE;
            break;

          case 'v':
            set |= UNAME_VERSION;
            break;

          case 'm':
            set |= UNAME_MACHINE;
            break;

          case 'p':
            if (set != UNAME_ALL)
              {
                set |= UNAME_UNKNOWN;
              }
            break;

          case 'i':
            set |= UNAME_PLATFORM;
            break;

          case '?':
          default:
            nsh_error(vtbl, g_fmtarginvalid, argv[0]);
            badarg = true;
            break;
        }
    }

  /* If a bad argument was encountered, then return without processing the
   * command
   */

  if (badarg)
    {
      return ERROR;
    }

  /* If nothing is provided on the command line, the default is -s */

  if (set == 0)
    {
      set = UNAME_KERNEL;
    }

  /* Get uname data */

  ret = uname(&info);
  if (ret < 0)
    {
      nsh_error(vtbl, g_fmtcmdfailed, argv[0], "uname", NSH_ERRNO);
      return ERROR;
    }

  /* Process each option */

  first = true;
  lib_memoutstream(&stream, (FAR char *)&output, sizeof(output));
  for (i = 0; set != 0; i++)
    {
      unsigned int mask = (1 << i);
      if ((set & mask) != 0)
        {
          set &= ~mask;
          switch (i)
            {
              case 0: /* print the kernel/operating system name */
                str = info.sysname;
                break;

#ifdef CONFIG_NET
              case 1: /* Print noname */
                str = info.nodename;
                break;
#endif
              case 2: /* Print the kernel release */
                str = info.release;
                break;

              case 3: /* Print the kernel version */
                str = info.version;
                break;

              case 4: /* Print the machine hardware name */
                str = info.machine;
                break;

              case 5: /* Print the machine platform name */
                str = BOARD_NAME;
                break;

              case 6: /* Print "unknown" */
                str = g_unknown;
                break;

              default:
                nsh_error(vtbl, g_fmtarginvalid, argv[0]);
                return ERROR;
            }

          if (!first)
            {
              lib_stream_putc(&stream, ' ');
            }

          lib_stream_puts(&stream, str, strlen(str));
          first = false;
        }
    }

  lib_stream_putc(&stream, '\n');
  nsh_write(vtbl, stream.buffer, stream.common.nput);
  return OK;
}
#endif