Symaptic: os/ossrv/genericopenlibs/openenvcore/libc/src/ftruncate.cpp@260cb5ec6c19

     1 // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // Name        : ftruncate.cpp

    15 // Part of     : LIBC

    16 // Contains the source for fchdir

    17 // Version     : 1.0

    18 //

    23 #include <unistd.h>

    24 #include <sys/types.h>

    25 #include <sys/stat.h>

    26 #include <errno.h>

    27 #include <fcntl.h>

    28 #include "reent.h"

    29 #include "sysif.h"

    31 extern "C" {

    33 /*

    34 The reentrant version for ftruncate function.

    35 */

    36 int _truncate_r(struct _reent *r, int fd, off_t len)

    37 	{

    38 	struct stat st;

    40 	if(fstat(fd,&st) != 0)

    41 		{

    42 		r->_errno  = EINVAL; 	//KErrArgument

    43 		return -1;

    44 		}

    45 	else

    46 		{

    47 		if (!(S_ISREG(st.st_mode)))

    48 			{

    49 			r->_errno = EBADF;	//KErrBadHandle

    50 			return -1;

    51 			}

    52 		}

    54   	return Backend()->Truncate( fd, len, r->_errno);

    55 	}

    57 /*

    58 Truncates the given file (using file descriptor) to the length specified.

    59 Calls the reentrant version.

    60 The ftruncate() function shall cause the size of the file to be truncated

    61 to length arument. If the size of the file previously exceeded length, the

    62 extra data shall no longer be available to reads on the file. If the file

    63 previously was smaller than this size, ftruncate() shall either increase

    64 the size of the file or fail. Upon successful completion, ftruncate() shall

    65 return 0; otherwise, -1 shall be returned and errno set to indicate the error.

    66 */

    67 EXPORT_C int ftruncate(int filedesc, off_t length)

    68 	{

    69 	return _truncate_r(_REENT, filedesc, length);

    70 	}

    72 /*

    73 Truncates the given file (using file name) to the length specified.

    74 Calls the reentrant version.

    75 The truncate() function shall cause the size of the file to be truncated

    76 to length arument. If the size of the file previously exceeded length, the

    77 extra data shall no longer be available to reads on the file. If the file

    78 previously was smaller than this size, truncate() shall either increase

    79 the size of the file or fail. Upon successful completion, truncate() shall

    80 return 0; otherwise, -1 shall be returned and errno set to indicate the error.

    81 */

    82 EXPORT_C int truncate(const char *file , off_t length)

    83 	{

    84 	int fd = 0;

    85 	int retval = 0;

    86 	int errVal = 0;

    88 	  if((fd = open(file , O_WRONLY)) < 0)

    89 	  	{

    90 	  	 return -1;

    91 	  	}

    92 	  retval =  ftruncate(fd , length);

    93 	  if(retval < 0)

    94 	  	{

    95 	  	errVal = errno; //Store the error value

    96 	  	close(fd) ;

    97 	  	errno = errVal;

    98 	  	return retval;

    99 	  	}

   101 	 close(fd);

   102 	 return retval;

   103 	}

   105 } //extern "C"

author	sl
	Tue, 10 Jun 2014 14:32:02 +0200
changeset 1	260cb5ec6c19
permissions	-rw-r--r--