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// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Name : ftruncate.cpp
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// Part of : LIBC
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// Contains the source for fchdir
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// Version : 1.0
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//
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "reent.h"
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#include "sysif.h"
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extern "C" {
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/*
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The reentrant version for ftruncate function.
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*/
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int _truncate_r(struct _reent *r, int fd, off_t len)
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{
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struct stat st;
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if(fstat(fd,&st) != 0)
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{
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r->_errno = EINVAL; //KErrArgument
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return -1;
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}
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else
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{
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if (!(S_ISREG(st.st_mode)))
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{
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r->_errno = EBADF; //KErrBadHandle
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return -1;
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}
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}
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return Backend()->Truncate( fd, len, r->_errno);
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}
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/*
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Truncates the given file (using file descriptor) to the length specified.
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Calls the reentrant version.
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The ftruncate() function shall cause the size of the file to be truncated
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to length arument. If the size of the file previously exceeded length, the
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extra data shall no longer be available to reads on the file. If the file
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previously was smaller than this size, ftruncate() shall either increase
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the size of the file or fail. Upon successful completion, ftruncate() shall
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return 0; otherwise, -1 shall be returned and errno set to indicate the error.
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*/
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EXPORT_C int ftruncate(int filedesc, off_t length)
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{
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return _truncate_r(_REENT, filedesc, length);
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}
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/*
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Truncates the given file (using file name) to the length specified.
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Calls the reentrant version.
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The truncate() function shall cause the size of the file to be truncated
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to length arument. If the size of the file previously exceeded length, the
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extra data shall no longer be available to reads on the file. If the file
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previously was smaller than this size, truncate() shall either increase
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the size of the file or fail. Upon successful completion, truncate() shall
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return 0; otherwise, -1 shall be returned and errno set to indicate the error.
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*/
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EXPORT_C int truncate(const char *file , off_t length)
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{
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int fd = 0;
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int retval = 0;
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int errVal = 0;
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if((fd = open(file , O_WRONLY)) < 0)
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{
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return -1;
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}
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retval = ftruncate(fd , length);
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if(retval < 0)
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{
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errVal = errno; //Store the error value
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close(fd) ;
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errno = errVal;
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return retval;
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}
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close(fd);
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return retval;
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}
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} //extern "C"
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