curpath.c

嵌入式系统中文件系统源代码

/*************************************************************
File Name: curpath.C
Last Modified Date: 2001/04/17
Programmer: MSC
Compiler:
Platform:
Usage:
	Current path API set.
**************************************************************/
#include <sys/syscall.h>

#include <stdio.h>
#include <string.h>

//#include "../rDebug/include/rdebug.h"
#include "../include/filesys.h"

#ifdef FS_CURRENT_DIRECTORY_ENABLED


// current pathname
static unsigned char *CurrentPath[DEVICE_NUM] = { NULL, NULL, NULL, NULL };


// FileSys.c
extern int CurrentDrive;

/* marked by chilong 01/15/2002
extern unsigned char *Pathname1;
   marked by chilong 01/15/2002 */

/**** added by chilong ****/
extern short FileSysDeviceTable[DEVICE_NUM];
/**** added by chilong ****/


/*************************************************************
Function: initCurrentPath
Description:
	Initialize the current path.
Return value:
	 0: init succeeded
	-1: init failed
**************************************************************/
int initCurrentPath(void)
{
  int i;
  unsigned char *pathBuf;

  pathBuf = (unsigned char *)ap_malloc(DEVICE_NUM * (MAX_PATHNAME_LEN + 2));
  if (pathBuf == NULL)
  {
	FileSys_Errno = ERROR_ALLOC_MEM;
	return -1;
  }

  for (i = 0; i < DEVICE_NUM; i++)
	CurrentPath[i] = (unsigned char *)((unsigned long)pathBuf + i * (MAX_PATHNAME_LEN + 2));
  
  // the current path after initialization is "\\"
  resetAllCurrentPath();
  return 0;
}



/*************************************************************
Function: resetAllCurrentPath
Description:
	Reset the current path.
Return value:
	 0: reset succeeded
	-1: reset failed
**************************************************************/
int resetAllCurrentPath(void)
{
  int i;

  for (i = 0; i < DEVICE_NUM; i++)
  {
	if (CurrentPath[i] == NULL)
		return -1;

	CurrentPath[i][0] = '\\';
	CurrentPath[i][1] = '\0';
  }

  return 0;
}



/*************************************************************
Function: resetCurrentPath
Description:
	Reset the specified current path.
Input:
	driveNO - the drive number (0 = A:, 1 = B:, ...)
Return value:
	 0: reset succeeded
	-1: reset failed
**************************************************************/
int resetCurrentPath(int driveNO)
{
  if (checkDrive(driveNO) == -1)
  {
	FileSys_Errno = ERROR_INVALID_DRIVE;
	return -1;
  }

  if (CurrentPath[driveNO] == NULL)
	return -1;

  CurrentPath[driveNO][0] = '\\';
  CurrentPath[driveNO][1] = '\0';

  return 0;
}



/*************************************************************
Function: getCompletePath
Description:
	Merge the given partial pathname with the current directory
	to give a complete pathname
Input:
	driveNO - the drive number (0 = A:, 1 = B:, ...)
	partialName - the given pathname
Output:
	completeName - the complete pathname
Return value:
	 0: merge succeeded
	-1: merge failed
**************************************************************/
int getCompletePath(int driveNO, unsigned char *partialName, unsigned char *completeName)
{
  int nameTail = 0;
  int i = 0;

  #ifdef FILESYS_DEBUG
	sprintf(FS_DebugString, "[getCompletePath] driveNO = %d, partialName = %s", driveNO, partialName);
	SprintStringLn(FS_DebugString);
	sprintf(FS_DebugString, "    currentPath = %s", CurrentPath[driveNO]);
	SprintStringLn(FS_DebugString);
  #endif

  if (checkDrive(driveNO) == -1)
  {
	FileSys_Errno = ERROR_INVALID_DRIVE;
	return -1;
  }

  if (partialName[0] == '\\' || partialName[0] == '/')
  {
	// the given pathname is a complete pathname
	do
	{
		completeName[nameTail] = partialName[nameTail];
		nameTail++;
		if (nameTail >= MAX_PATHNAME_LEN)
		{
			completeName[0] = '\0';
			FileSys_Errno = ERROR_PATHNAME_TOO_LONG;
			return -1;
		}
	} while (completeName[nameTail - 1] != '\0');

	return 0;
  }

  // copy the current directory name to the complete pathname
  while (CurrentPath[driveNO][nameTail] != '\0')
  {
	completeName[nameTail] = CurrentPath[driveNO][nameTail];
	nameTail++;

	if (nameTail >= MAX_PATHNAME_LEN)
	{
		// current directory name corrupted
		// reset current directory to "\"
		memoryZero((void *)CurrentPath[driveNO], MAX_PATHNAME_LEN);
		CurrentPath[driveNO][0] = '\\';
		CurrentPath[driveNO][1] = '\0';

		// the complete pathname is also "\"
		completeName[0] = '\0';

		FileSys_Errno = ERROR_CURRENT_DIRECTORY_BAD;

		return -1;
	}
  }

//  if (completeName[nameTail - 1] == '\\' || completeName[nameTail - 1] == '/')
  if (nameTail > 0 && completeName[nameTail - 1] == '\\' || completeName[nameTail - 1] == '/')
  {
	completeName[nameTail] = '\0';
  }
  else
  {
	completeName[nameTail++] = '\\';
	completeName[nameTail] = '\0';
  }

  while (partialName[i] != '\0')
  {
	if (partialName[i] == '.')
	{
		i++;

		if (partialName[i] == '.')
		{
			// name is ".."
			i++;

			if (partialName[i] == '\\' || partialName[i] == '/' || partialName[i] == '\0')
			{
				// name is "..\\" or "..\0"
				while (partialName[i] == '\\' || partialName[i] == '/')
					i++;

				// the complete directory name loops back one directory level
				if (nameTail > 1)
				{
					// go before the last '\\'
					nameTail -= 2;
				}
				else
				{
					// the complete directory is already "\\", can't go back
					completeName[0] = '\0';
					FileSys_Errno = ERROR_INVALID_PATHNAME;
					return -1;
				}

				/* marked by chilong 02/05/2002
				while (completeName[nameTail] != '\\' && completeName[nameTail] != '/' && nameTail > 0)
				{
					nameTail--;
				}
				   marked by chilong 02/05/2002 */

				/**** modified by chilong 02/05/2002 ****/
				while (1)
				{
				#ifdef CHINESE_CODE_USED
					if ( (completeName[nameTail] <= 0x80 && completeName[nameTail] == '\\') ||
						(completeName[nameTail] <= 0x80 && completeName[nameTail] == '/') || 
						nameTail <= 0)
						break;
				#else
					if (completeName[nameTail] == '\\' || completeName[nameTail] == '/' || nameTail <= 0)
						break;
				#endif
						
					nameTail--;
				}
				/**** modified by chilong 02/05/2002 ****/

				if (partialName[i] == '\0')
				{
//					completeName[nameTail] = '\0';
					/**** modified by chilong ****/
					if (nameTail != 0)
						completeName[nameTail] = '\0';
					else
						completeName[1] = '\0';
					/**** modified by chilong ****/
						
						
					return 0;
				}
				else
				{
					nameTail++;
					completeName[nameTail] = '\0';
				}
			}
			else
			{
				// name is not "..\\" or "..\0"
				completeName[0] = '\0';
				FileSys_Errno = ERROR_INVALID_PATHNAME;
				return -1;
			}
		}
		else if (partialName[i] == '\\' || partialName[i] == '/')
		{
			// name is ".\\"
			while (partialName[i] == '\\' || partialName[i] == '/')
				i++;
		}
		else
		{
			// partial directory name incorrect
			completeName[0] = '\0';
			FileSys_Errno = ERROR_INVALID_PATHNAME;
			return -1;
		}
	}
	else
	{
		// append a level of directory from given pathname to complete pathname
		while (partialName[i] != '\\' && partialName[i] != '/' && partialName[i] != '\0')
		{
			/* marked by chilong 02/05/2002 
			completeName[nameTail] = partialName[i];
			nameTail++;
			i++;
			   marked by chilong 02/05/2002 */
			   
			/**** modified by chilong 02/05/2002 ****/
		#ifdef CHINESE_CODE_USED
			if (partialName[i] > 0x80)
			{
				completeName[nameTail] = partialName[i];
				completeName[nameTail+1] = partialName[i+1];
				nameTail+=2;
				i+=2;
			}
			else
			{
				completeName[nameTail] = partialName[i];
				nameTail++;
				i++;
			}
		#else
			completeName[nameTail] = partialName[i];
			nameTail++;
			i++;
		#endif
			/**** modified by chilong 02/05/2002 ****/

			if (nameTail >= MAX_PATHNAME_LEN)
			{
				// pathname too long
				completeName[0] = '\0';
				FileSys_Errno = ERROR_PATHNAME_TOO_LONG;
				return -1;
			}
		}

		if (partialName[i] == '\0')
		{
			completeName[nameTail] = '\0';
			return 0;
		}
		else if (partialName[i] == '\\' || partialName[i] == '/')
		{
			completeName[nameTail] = '\\';
			nameTail++;
			i++;
		}
		else
		{
			completeName[0] = '\0';
			FileSys_Errno = ERROR_INVALID_PATHNAME;
			return -1;
		}
	}
  }

  completeName[nameTail] = '\0';

  return 0;
}



/*************************************************************
Function: checkPath
Description:
	check to see if the pathname is valid
Input:
	driveNO - the drive number (0 = A:, 1 = B:, ...)
	pathname - the complete pathname
Return value:
	 0: pathname valid
	-1: pathname invalid
**************************************************************/
int checkPath(int driveNO, unsigned char *pathname)
{
  struct _stat status;
  int origDrive;
//  int returnValue = 0;

  #ifdef FILESYS_DEBUG
	sprintf(FS_DebugString, "[checkPath] driveNO = %d, pathname = %s", driveNO, pathname);
	SprintStringLn(FS_DebugString);
  #endif

  if (FileSys_Running == 0)
  {
	FileSys_Errno = ERROR_FILE_SYSTEM_NOT_INIT;
	return -1;
  }

  if (checkDrive(driveNO) == -1)
  {
	FileSys_Errno = ERROR_INVALID_DRIVE;
	return -1;
  }

  origDrive = fs_getdrive();
  
  // we change drive here but if this functions fails,
  // we'll change CurrentDrive back to origDrive
  CurrentDrive = driveNO;

  #ifdef FILESYS_DEBUG
	sprintf(FS_DebugString, "    original driveNO = %d", origDrive - 1);
	SprintStringLn(FS_DebugString);
  #endif
/*
  if (origDrive != driveNO + 1)
  {
	if (chdrive(driveNO + 1) == -1)
		return -1;
  }
*/

  /* marked by chilong 01/15/2002 
  if (stat(pathname, &status) == -1)