nsh_fscmds.c

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

/****************************************************************************
 * examples/nsh/nsh_fscmds.c
 *
 *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <[e-mail]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

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

#include <nuttx/config.h>
#include <sys/types.h>

#if CONFIG_NFILE_DESCRIPTORS > 0
# include <sys/stat.h>
# include <fcntl.h>
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
# ifdef CONFIG_FS_FAT /* Need at least one filesytem in configuration */
#   include <sys/mount.h>
# endif
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#include <libgen.h>
#include <errno.h>

#include "nsh.h"

/****************************************************************************
 * Definitions
 ****************************************************************************/

#define LSFLAGS_SIZE          1
#define LSFLAGS_LONG          2
#define LSFLAGS_RECURSIVE     4

/* The size of the I/O buffer may be specified in the
 * configs/<board-name>defconfig file -- provided that it is at least as
 * large as PATH_MAX.
 */

#if CONFIG_NFILE_DESCRIPTORS > 0
#  ifdef CONFIG_NSH_IOBUFFERSIZE
#    if CONFIG_NSH_IOBUFFERSIZE > (PATH_MAX + 1)
#      define IOBUFFERSIZE CONFIG_NSH_IOBUFFERSIZE
#    else
#      define IOBUFFERSIZE (PATH_MAX + 1)
#    endif
#  else
#    define IOBUFFERSIZE      1024
#  endif
# else
#    define IOBUFFERSIZE (PATH_MAX + 1)
#endif

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

typedef int (*direntry_handler_t)(FAR void *, const char *, struct dirent *, void *);

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

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

static char g_iobuffer[IOBUFFERSIZE];

/****************************************************************************
 * Public Data
 ****************************************************************************/

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

/****************************************************************************
 * Name: trim_dir
 ****************************************************************************/

static void trim_dir(char *arg)
{
 /* Skip any trailing '/' characters (unless it is also the leading '/') */

 int len = strlen(arg) - 1;
 while (len > 0 && arg[len] == '/')
   {
      arg[len] = '\0';
      len--;
   }
}

/****************************************************************************
 * Name: getdirpath
 ****************************************************************************/

static char *getdirpath(const char *path, const char *file)
{
  /* Handle the case where all that is left is '/' */

  if (strcmp(path, "/") == 0)
    {
      sprintf(g_iobuffer, "/%s", file);
    }
  else
    {
      sprintf(g_iobuffer, "%s/%s", path, file);
    }

  g_iobuffer[PATH_MAX] = '\0';
  return strdup(g_iobuffer);
}

/****************************************************************************
 * Name: foreach_direntry
 ****************************************************************************/

#if CONFIG_NFILE_DESCRIPTORS > 0
static int foreach_direntry(FAR void *handle, const char *cmd, const char *dirpath,
                            direntry_handler_t handler, void *pvarg)
{
  DIR *dirp;
  int ret = OK;

  /* Trim trailing '/' from directory names */

#ifdef CONFIG_FULL_PATH
  trim_dir(arg);
#endif

  /* Open the directory */

  dirp = opendir(dirpath);

  if (!dirp)
    {
      /* Failed to open the directory */

      nsh_output(handle, g_fmtnosuch, cmd, "directory", dirpath);
      return ERROR;
    }

  /* Read each directory entry */

  for (;;)
    {
      struct dirent *entryp = readdir(dirp);
      if (!entryp)
        {
          /* Finished with this directory */

          break;
        }

      /* Call the handler with this directory entry */

      if (handler(handle, dirpath, entryp, pvarg) <  0)
        {
          /* The handler reported a problem */

          ret = ERROR;
          break;
        }
    }

  closedir(dirp);
  return ret;
}
#endif

/****************************************************************************
 * Name: ls_handler
 ****************************************************************************/

#if CONFIG_NFILE_DESCRIPTORS > 0
static int ls_handler(FAR void *handle, const char *dirpath, struct dirent *entryp, void *pvarg)
{
  unsigned int lsflags = (unsigned int)pvarg;
  int ret;

  /* Check if any options will require that we stat the file */

  if ((lsflags & (LSFLAGS_SIZE|LSFLAGS_LONG)) != 0)
    {
      struct stat buf;
      char *fullpath = getdirpath(dirpath, entryp->d_name);

      /* Yes, stat the file */

      ret = stat(fullpath, &buf);
      free(fullpath);
      if (ret != 0)
        {
          nsh_output(handle, g_fmtcmdfailed, "ls", "stat", NSH_ERRNO);
          return OK;
        }

      if ((lsflags & LSFLAGS_LONG) != 0)
        {
          char details[] = "----------";
          if (S_ISDIR(buf.st_mode))
            {
              details[0]='d';
            }
          else if (S_ISCHR(buf.st_mode))
            {
              details[0]='c';
            }
          else if (S_ISBLK(buf.st_mode))
            {
              details[0]='b';
            }

          if ((buf.st_mode & S_IRUSR) != 0)
            {
              details[1]='r';
            }

          if ((buf.st_mode & S_IWUSR) != 0)
            {
              details[2]='w';
            }

          if ((buf.st_mode & S_IXUSR) != 0)
            {
              details[3]='x';
            }

          if ((buf.st_mode & S_IRGRP) != 0)
            {
              details[4]='r';
            }

          if ((buf.st_mode & S_IWGRP) != 0)
            {
              details[5]='w';
            }

          if ((buf.st_mode & S_IXGRP) != 0)
            {
              details[6]='x';
            }

          if ((buf.st_mode & S_IROTH) != 0)
            {
              details[7]='r';
            }

          if ((buf.st_mode & S_IWOTH) != 0)
            {
              details[8]='w';
            }

          if ((buf.st_mode & S_IXOTH) != 0)
            {
              details[9]='x';
            }

          nsh_output(handle, " %s", details);
        }

      if ((lsflags & LSFLAGS_SIZE) != 0)
        {
          nsh_output(handle, "%8d", buf.st_size);
        }
    }

  /* then provide the filename that is common to normal and verbose output */

#ifdef CONFIG_FULL_PATH
  nsh_output(handle, " %s/%s", arg, entryp->d_name);
#else
  nsh_output(handle, " %s", entryp->d_name);
#endif

  if (DIRENT_ISDIRECTORY(entryp->d_type))
    {
      nsh_output(handle, "/\n");
    }
  else
    {
      nsh_output(handle, "\n");
    }
  return OK;
}
#endif

/****************************************************************************
 * Name: ls_recursive
 ****************************************************************************/

#if CONFIG_NFILE_DESCRIPTORS > 0
static int ls_recursive(FAR void *handle, const char *dirpath, struct dirent *entryp, void *pvarg)
{
  /* Is this entry a directory? */

  if (DIRENT_ISDIRECTORY(entryp->d_type))
    {
      /* Yes.. */

      char *newpath;
      newpath = getdirpath(dirpath, entryp->d_name);

      /* List the directory contents */

      nsh_output(handle, "%s:\n", newpath);
      foreach_direntry(handle, "ls", newpath, ls_handler, pvarg);

      /* Then recurse to list each directory within the directory */

      foreach_direntry(handle, "ls", newpath, ls_recursive, pvarg);
      free(newpath);
    }
  return OK;
}
#endif

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

/****************************************************************************
 * Name: cmd_cat
 ****************************************************************************/

#if CONFIG_NFILE_DESCRIPTORS > 0
void cmd_cat(FAR void *handle, int argc, char **argv)
{
  char buffer[1024];

  /* Open the file for reading */