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: fread.c,v $ 00036 * Revision 1.2 2004/04/15 10:23:24 haraldkipp 00037 * Distinguish between read error and end of file 00038 * 00039 * Revision 1.1.1.1 2003/05/09 14:40:27 haraldkipp 00040 * Initial using 3.2.1 00041 * 00042 * Revision 1.1 2003/02/04 17:49:05 harald 00043 * *** empty log message *** 00044 * 00045 */ 00046 00047 00048 #include "nut_io.h" 00049 00050 #include <io.h> 00051 00056 00071 size_t fread(void *buffer, size_t size, size_t count, FILE * stream) 00072 { 00073 size_t rc; 00074 size_t nu = 0; 00075 00076 if (size > 1) 00077 count *= size; 00078 if (stream->iob_flags & _IOUNG) { 00079 stream->iob_flags &= ~_IOUNG; 00080 *((char *) buffer) = (char) stream->iob_unget; 00081 buffer = ((char *) buffer) + 1; 00082 count--; 00083 nu++; 00084 } 00085 rc = (size_t) _read(stream->iob_fd, buffer, count); 00086 if (rc == 0) { 00087 stream->iob_flags |= _IOEOF; 00088 } 00089 else if(rc == (size_t)-1) { 00090 stream->iob_flags |= _IOERR; 00091 rc = 0; 00092 } 00093 rc += nu; 00094 if (size > 1) { 00095 rc /= size; 00096 } 00097 return rc; 00098 } 00099