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:
sl@0: // Name        : ftruncate.cpp
sl@0: // Part of     : LIBC
sl@0: // Contains the source for fchdir
sl@0: // Version     : 1.0
sl@0: //
sl@0: 
sl@0: 
sl@0:  
sl@0: 
sl@0: #include <unistd.h>
sl@0: #include <sys/types.h>
sl@0: #include <sys/stat.h>
sl@0: #include <errno.h> 
sl@0: #include <fcntl.h> 
sl@0: #include "reent.h"
sl@0: #include "sysif.h"
sl@0: 
sl@0: extern "C" {
sl@0: 
sl@0: /*
sl@0: The reentrant version for ftruncate function.
sl@0: */
sl@0: int _truncate_r(struct _reent *r, int fd, off_t len)
sl@0: 	{
sl@0: 	struct stat st;
sl@0: 	
sl@0: 	if(fstat(fd,&st) != 0)
sl@0: 		{
sl@0: 		r->_errno  = EINVAL; 	//KErrArgument
sl@0: 		return -1;
sl@0: 		}
sl@0: 	else 
sl@0: 		{
sl@0: 		if (!(S_ISREG(st.st_mode)))
sl@0: 			{
sl@0: 			r->_errno = EBADF;	//KErrBadHandle
sl@0: 			return -1;
sl@0: 			}
sl@0: 		}
sl@0: 	
sl@0:   	return Backend()->Truncate( fd, len, r->_errno);
sl@0: 	}
sl@0: 
sl@0: /*
sl@0: Truncates the given file (using file descriptor) to the length specified.
sl@0: Calls the reentrant version.
sl@0: The ftruncate() function shall cause the size of the file to be truncated
sl@0: to length arument. If the size of the file previously exceeded length, the
sl@0: extra data shall no longer be available to reads on the file. If the file
sl@0: previously was smaller than this size, ftruncate() shall either increase 
sl@0: the size of the file or fail. Upon successful completion, ftruncate() shall
sl@0: return 0; otherwise, -1 shall be returned and errno set to indicate the error.
sl@0: */
sl@0: EXPORT_C int ftruncate(int filedesc, off_t length)
sl@0: 	{
sl@0: 	return _truncate_r(_REENT, filedesc, length);
sl@0: 	}
sl@0: 
sl@0: /*
sl@0: Truncates the given file (using file name) to the length specified.
sl@0: Calls the reentrant version.
sl@0: The truncate() function shall cause the size of the file to be truncated
sl@0: to length arument. If the size of the file previously exceeded length, the
sl@0: extra data shall no longer be available to reads on the file. If the file
sl@0: previously was smaller than this size, truncate() shall either increase 
sl@0: the size of the file or fail. Upon successful completion, truncate() shall
sl@0: return 0; otherwise, -1 shall be returned and errno set to indicate the error.
sl@0: */
sl@0: EXPORT_C int truncate(const char *file , off_t length) 
sl@0: 	{
sl@0: 	int fd = 0;
sl@0: 	int retval = 0;
sl@0: 	int errVal = 0;
sl@0: 	 
sl@0: 	  if((fd = open(file , O_WRONLY)) < 0) 
sl@0: 	  	{
sl@0: 	  	 return -1;
sl@0: 	  	}
sl@0: 	  retval =  ftruncate(fd , length);
sl@0: 	  if(retval < 0) 
sl@0: 	  	{
sl@0: 	  	errVal = errno; //Store the error value 
sl@0: 	  	close(fd) ;
sl@0: 	  	errno = errVal;
sl@0: 	  	return retval;
sl@0: 	  	}
sl@0: 	  	
sl@0: 	 close(fd);
sl@0: 	 return retval;
sl@0: 	}
sl@0: 
sl@0: } //extern "C"