00001 /* 00002 * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved. 00003 * 00004 * Redistribution and use in source and binary forms, with or without 00005 * modification, are permitted provided that the following conditions 00006 * are met: 00007 * 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the copyright holders nor the names of 00014 * contributors may be used to endorse or promote products derived 00015 * from this software without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS 00018 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00019 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00020 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE 00021 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00022 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00023 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00024 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00025 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00026 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00027 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00028 * SUCH DAMAGE. 00029 * 00030 * For additional information see http://www.ethernut.de/ 00031 * 00032 */ 00033 00034 /* 00035 * $Log: tell.c,v $ 00036 * Revision 1.1 2005/08/05 11:17:53 olereinhardt 00037 * Added support for _seek, _tell, fseek, ftell functions 00038 * 00039 */ 00040 00041 #include "nut_io.h" 00042 00043 #include <sys/device.h> 00044 #include <fs/fs.h> 00045 #include <errno.h> 00050 00061 long _tell(int fd) 00062 { 00063 NUTFILE *fp = (NUTFILE *) ((uptr_t) fd); 00064 NUTDEVICE *dev = fp->nf_dev; 00065 IOCTL_ARG3 conf; 00066 00067 long offset = 0; 00068 int origin = SEEK_CUR; 00069 00070 conf.arg1 = (void*) fp; 00071 conf.arg2 = (void*) &offset; 00072 conf.arg3 = (void*) origin; 00073 00074 if (dev != 0) { 00075 if ((*dev->dev_ioctl) (dev, FS_FILE_SEEK, &conf)) { 00076 return offset; 00077 } else { 00078 errno = EINVAL; 00079 return -1; 00080 } 00081 } else { 00082 errno = EINVAL; 00083 return -1; 00084 } 00085 } 00086