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101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/*
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* $Id: wce_rewind.c,v 1.2 2006/04/09 16:48:18 mloskot Exp $
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*
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* Defines rewind() function.
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*
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* Created by Mateusz Loskot (mateusz@loskot.net)
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*
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* Copyright (c) 2006 Taxus SI Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
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* THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* MIT License:
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* http://opensource.org/licenses/mit-license.php
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*
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* Contact:
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* Taxus SI Ltd.
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* http://www.taxussi.com.pl
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*
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*/
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#include <windows.h>
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#include <assert.h>
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/*******************************************************************************
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* wceex_rewind - Reset the file position indicator in a stream
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*
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* Description:
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*
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* The call rewind(stream) shall be equivalent to:
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* (void) fseek(stream, 0L, SEEK_SET)
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*
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* Internally, rewind() function uses SetFilePointer call from
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* Windows CE API.
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*
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* Windows CE specific:
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* On Windows CE HANDLE type is defined as typedef void *HANDLE
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* and FILE type is declared as typedef void FILE.
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*
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* Return:
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*
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* No return value.
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*
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* Reference:
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*
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* IEEE 1003.1, 2004 Edition
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*
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*******************************************************************************/
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void wceex_rewind(FILE * fp)
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{
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int ret;
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/* TODO - mloskot: WARNING!
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* fseek() does not clear error and end-of-file indicators for the stream
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* So, that's why dirty asserts are used to get informed about potential problems.
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*/
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ret = fseek(fp, 0L, SEEK_SET);
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assert(0 == ret);
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assert(0 == ferror(fp));
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assert(!feof(fp));
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/*
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// XXX - mloskot:
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// FILE* to HANDLE conversion needs hacks like _get_osfhandle()
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// which are not available on Windows CE.
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// Simple cast does not work.
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//
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// TODO: Does anyone know how to convert FILE* to HANDLE?
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DWORD dwError;
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HANDLE hFile;
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hFile = (void*)fp;
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if (0xFFFFFFFF == SetFilePointer(hFile, 0, NULL, FILE_BEGIN))
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{
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dwError = GetLastError();
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assert(NO_ERROR == dwError);
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}
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*/
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}
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