vshfilelist.c

上一个上传的有问题,这个是好的。visopsys包括系统内核和GUI的全部SOURCE code ,还包括一些基本的docs文档。里面src子目录对应所有SOURCE code.对于想研究操作系统的朋

// 
//  Visopsys
//  Copyright (C) 1998-2007 J. Andrew McLaughlin
//  
//  This library is free software; you can redistribute it and/or modify it
//  under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation; either version 2.1 of the License, or (at
//  your option) any later version.
//
//  This library 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 Lesser
//  General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with this library; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//  vshFileList.c
//

// This contains some useful functions written for the shell

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/vsh.h>
#include <sys/api.h>


_X_ int vshFileList(const char *itemName)
{
  // Desc: Print a listing of a file or directory named 'itemName'.  'itemName' must be an absolute pathname, beginning with '/'.

  int status = 0;
  char lineBuffer[256];
  int numberFiles = 0;
  file theFile;
  unsigned bytesFree = 0;

  // Make sure file name isn't NULL
  if (itemName == NULL)
    return (errno = ERR_NULLPARAMETER);
  
  // Initialize the file structure
  bzero(&theFile, sizeof(file));

  // Call the "find file" routine to see if the file exists
  status = fileFind(itemName, &theFile);
  if (status < 0)
    return (errno = status);
    
  // Get the bytes free for the filesystem
  bytesFree = filesystemGetFree(theFile.filesystem);

  // We do things differently depending upon whether the target is a 
  // file or a directory

  if (theFile.type == fileT)
    {
      // This means the itemName is a single file.  We just output
      // the appropriate information for that file
      bzero(lineBuffer, 256);
      strcpy(lineBuffer, theFile.name);

      if (strlen(theFile.name) < 24)
	memset((lineBuffer + strlen(lineBuffer)), ' ',
	       (26 - (int) strlen(theFile.name)));
      else
	strcat(lineBuffer, "  ");

      // The date and time
      vshPrintDate((lineBuffer + strlen(lineBuffer)), theFile.modifiedDate);
      strcat(lineBuffer, " ");
      vshPrintTime((lineBuffer + strlen(lineBuffer)), theFile.modifiedTime);
      strcat(lineBuffer, "    ");

      // The file size
      printf("%s%u\n", lineBuffer, theFile.size);
    }

  else
    {
      printf("\n  Directory of %s\n", (char *) itemName);

      // Get the first file
      status = fileFirst(itemName, &theFile);
      if ((status != ERR_NOSUCHFILE) && (status < 0))
	return (errno = status);

      else if (status >= 0) while (1)
	{
	  bzero(lineBuffer, 256);
	  strcpy(lineBuffer, theFile.name);

	  if (theFile.type == dirT)
	    strcat(lineBuffer, "/");
	  else 
	    strcat(lineBuffer, " ");

	  if (strlen(theFile.name) < 23)
	    memset((lineBuffer + strlen(lineBuffer)), ' ',
		   (25 - (int) strlen(theFile.name)));
	  else
	    strcat(lineBuffer, "  ");

	  // The date and time
	  vshPrintDate((lineBuffer + strlen(lineBuffer)),
		       theFile.modifiedDate);
	  strcat(lineBuffer, " ");
	  vshPrintTime((lineBuffer + strlen(lineBuffer)),
		       theFile.modifiedTime);
	  strcat(lineBuffer, "    ");

	  // The file size
	  printf("%s%u\n", lineBuffer, theFile.size);

	  numberFiles += 1;

	  status = fileNext(itemName, &theFile);
	  if (status < 0)
	    break;
	}
      
      printf("  ");

      if (numberFiles == 0)
	printf("No");
      else
	printf("%u", numberFiles);
      printf(" file");
      if ((numberFiles == 0) || (numberFiles > 1))
	putchar('s');

      printf("\n  %u bytes free\n\n", bytesFree);
    }

  return (status = 0);
}