sl@0: /*
sl@0: * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description:  Implementation of link/symlink.
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: // INCLUDE FILES
sl@0: 
sl@0: #include <sys/errno.h>
sl@0: #include <sys/types.h>
sl@0: #include <wchar.h>
sl@0: #include <string.h>
sl@0: #include <unistd.h>
sl@0: #include "lposix.h"
sl@0: #include <sys/stat.h>
sl@0: #include <sys/limits.h>
sl@0: #include "sysreent.h"
sl@0: #include <stdlib.h>
sl@0: #include "sysif.h"
sl@0: #include "systemspecialfilercg.h"
sl@0: #include "link.h"
sl@0: 
sl@0: // -----------------------------------------------------------------------------
sl@0: // Funcation name: link
sl@0: // Description: Provides link functionality.
sl@0: // Returns:  0    : On success
sl@0: //          -1    : On error
sl@0: // In case of error, errno value set
sl@0: // Remark: This is a simulated functionality and not supported by the platform     
sl@0: // -----------------------------------------------------------------------------
sl@0: //
sl@0: 
sl@0: extern "C" {
sl@0: 
sl@0: #define	MAXPATHLEN	260	/* E32STD.H: KMaxFullName + 4 to avoid data loss */
sl@0: 
sl@0: EXPORT_C int link(const char *oldpath, const char *newpath)
sl@0: 	{
sl@0:     wchar_t _oldwidename[MAXPATHLEN+1];
sl@0:     wchar_t _newwidename[MAXPATHLEN+1];
sl@0: 
sl@0: 	if ((size_t)-1 != mbstowcs(_oldwidename, oldpath, MAXPATHLEN) && \
sl@0: 	    (size_t)-1 != mbstowcs(_newwidename, newpath, MAXPATHLEN)) 
sl@0: 		{
sl@0: 	    return _link_r(&errno, _oldwidename, _newwidename);		
sl@0: 		}
sl@0: 	errno = EILSEQ;
sl@0: 	return -1;
sl@0: 	}
sl@0: 
sl@0: // -----------------------------------------------------------------------------
sl@0: // Funcation name: symlink
sl@0: // Description: Provides symlink functionality which is exactly similar to link
sl@0: // in our case.
sl@0: // Returns: ssize_t : On success
sl@0: //          -1      : On error
sl@0: // In case of error, errno value set
sl@0: //      
sl@0: // -----------------------------------------------------------------------------
sl@0: //
sl@0:     
sl@0: EXPORT_C int symlink(const char *oldpath, const char *newpath)
sl@0: 	{
sl@0:     wchar_t _oldwidename[MAXPATHLEN+1];
sl@0:     wchar_t _newwidename[MAXPATHLEN+1];
sl@0: 
sl@0: 	if ((size_t)-1 != mbstowcs(_oldwidename, oldpath, MAXPATHLEN) && \
sl@0: 	    (size_t)-1 != mbstowcs(_newwidename, newpath, MAXPATHLEN)) 
sl@0: 		{
sl@0: 	    return _link_r(&errno, _oldwidename, _newwidename);		
sl@0: 		}            
sl@0: 	errno = EILSEQ;
sl@0: 	return -1;	
sl@0: 	}
sl@0: 
sl@0: // -----------------------------------------------------------------------------
sl@0: // Funcation name: readlink
sl@0: // Description: Reads the link file.
sl@0: // Returns: ssize_t : On success
sl@0: //          -1      : On error
sl@0: // In case of error, errno value set
sl@0: //      
sl@0: // -----------------------------------------------------------------------------
sl@0: //
sl@0: 
sl@0: EXPORT_C ssize_t readlink(const char *path, char *buf, int bufsize)
sl@0: {
sl@0: 	TSpecialFileType fileType;
sl@0: 	struct SLinkInfo enBuf;
sl@0: 	int err = KErrNone;
sl@0: 	char name[MAXPATHLEN+1];
sl@0: 	
sl@0: 	wchar_t widename[MAXPATHLEN+1];
sl@0: 
sl@0: 	if(path)
sl@0: 		{	
sl@0: 		if ((size_t)-1 != mbstowcs(widename, path, MAXPATHLEN)) 
sl@0: 			{	
sl@0: 			/*Special file identification and read of IPC is utilized here*/
sl@0: 			if( (fileType = _SystemSpecialFileBasedFilePath(widename, err, Backend()->FileSession())) == EFileTypeSymLink)
sl@0: 				{
sl@0: 				if (err)
sl@0: 				    {
sl@0: 			    	return MapError(err, errno);
sl@0: 					}
sl@0: 				err = _ReadSysSplFile(widename, (char*)&enBuf, sizeof(struct SLinkInfo), errno, Backend()->FileSession());
sl@0: 				if (err == KErrNone)
sl@0: 					{
sl@0: 					if((0 < bufsize && bufsize <= SSIZE_MAX) && NULL != buf )	
sl@0: 						{
sl@0: 						if ((size_t)-1 != wcstombs(name, enBuf.iParentPath, sizeof(enBuf.iParentPath)))
sl@0: 							{
sl@0: 							strncpy(buf, name, bufsize);
sl@0: 							return (strlen(name) >= bufsize ? bufsize : strlen(buf));
sl@0: 							}
sl@0: 						}
sl@0: 					else
sl@0: 						{
sl@0: 						errno = EINVAL;
sl@0: 						return -1;	
sl@0: 						}
sl@0: 					}
sl@0: 				}
sl@0: 			else if(err || (EFileNotFound == fileType))
sl@0: 				{
sl@0: 				return MapError(err, errno);
sl@0: 				}				
sl@0: 			errno = EINVAL;
sl@0: 			return -1;		
sl@0: 			}
sl@0: 		return MapError(EILSEQ, errno);	
sl@0: 		}
sl@0: 	return MapError(EINVAL, errno);	
sl@0: 	}
sl@0: 
sl@0: // -----------------------------------------------------------------------------
sl@0: // Funcation name: unlink
sl@0: // Description: Provides unlink functionality.
sl@0: // Returns:  0    : On success
sl@0: //          -1    : On error
sl@0: // In case of error, errno value set
sl@0: //      
sl@0: // -----------------------------------------------------------------------------
sl@0: //
sl@0: 
sl@0: EXPORT_C int unlink(const char *pathname)
sl@0: {
sl@0: 	wchar_t _pathwidename[MAXPATHLEN+1];    
sl@0: 
sl@0: 	if ((size_t)-1 != mbstowcs(_pathwidename, pathname, MAXPATHLEN)) 
sl@0: 	{
sl@0: 	    return _unlink_r(&errno, _pathwidename);		
sl@0: 	}            
sl@0: 	errno  = EILSEQ;
sl@0: 	return -1;	      
sl@0: }
sl@0: 
sl@0: // -----------------------------------------------------------------------------
sl@0: // Funcation name: lstat, __xstat, __lxstat
sl@0: // Description: All these functions directly call stat by themself .
sl@0: // Returns:  0      : On success
sl@0: //          -1      : On error
sl@0: // In case of error, errno value set
sl@0: //      
sl@0: // -----------------------------------------------------------------------------
sl@0: //
sl@0: 
sl@0: EXPORT_C int lstat(const char *file_name, struct stat *buf)
sl@0: 	{
sl@0:     if(!buf)
sl@0:        {
sl@0:         errno = EFAULT ;
sl@0:         return -1 ; 
sl@0:        }
sl@0:     
sl@0:     wchar_t tmpbuf[MAXPATHLEN+1];   
sl@0:     if ((size_t)-1 != mbstowcs(tmpbuf, file_name, MAXPATHLEN))
sl@0:         {
sl@0:         return _lstat_r(&errno, tmpbuf, buf);
sl@0:         }
sl@0:     errno = EILSEQ;     
sl@0:     return -1;    
sl@0: 	}
sl@0: EXPORT_C int __xstat(int /*vers*/, const char *file, struct stat *buf)
sl@0: 	{
sl@0: 	return stat(file, buf);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int __lxstat (int /*version*/, const char *file, struct stat *buf)
sl@0: 	{
sl@0: 	return lstat(file, buf);
sl@0: 	}
sl@0: 
sl@0:     
sl@0: } // extern "C"
sl@0: 
sl@0: 
sl@0: //  End of File