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https://github.com/adtools/clib2.git
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90a192134e
of records or the size of each record is zero, both now call clearerr() to avoid giving the caller the wrong impression that an EOF or error occured. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14927 87f5fb63-7c3d-0410-a384-fd976d0f7a62
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
/*
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* $Id: stdio_fread.c,v 1.6 2005-04-24 19:38:59 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _STDIO_HEADERS_H
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#include "stdio_headers.h"
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#endif /* _STDIO_HEADERS_H */
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/****************************************************************************/
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size_t
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fread(void *ptr,size_t element_size,size_t count,FILE *stream)
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{
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struct iob * file = (struct iob *)stream;
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size_t result = 0;
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ENTER();
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SHOWPOINTER(ptr);
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SHOWVALUE(element_size);
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SHOWVALUE(count);
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SHOWPOINTER(stream);
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assert( ptr != NULL && stream != NULL );
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assert( (int)element_size >= 0 && (int)count >= 0 );
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if(__check_abort_enabled)
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__check_abort();
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flockfile(stream);
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(ptr == NULL || stream == NULL)
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{
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SHOWMSG("invalid parameters");
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__set_errno(EFAULT);
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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assert( __is_valid_iob(file) );
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assert( FLAG_IS_SET(file->iob_Flags,IOBF_IN_USE) );
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assert( file->iob_BufferSize > 0 );
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if(FLAG_IS_CLEAR(file->iob_Flags,IOBF_IN_USE))
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{
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SHOWMSG("this file is not even in use");
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SET_FLAG(file->iob_Flags,IOBF_ERROR);
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__set_errno(EBADF);
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goto out;
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}
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if(FLAG_IS_CLEAR(file->iob_Flags,IOBF_READ))
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{
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SHOWMSG("this file is not read-enabled");
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SET_FLAG(file->iob_Flags,IOBF_ERROR);
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__set_errno(EBADF);
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goto out;
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}
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if(element_size > 0 && count > 0)
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{
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size_t total_bytes_read = 0;
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size_t total_size;
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unsigned char * data = ptr;
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int c;
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if(__fgetc_check((FILE *)file) < 0)
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goto out;
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total_size = element_size * count;
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SHOWVALUE(total_size);
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while(total_size-- > 0)
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{
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c = __getc(file);
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if(c == EOF)
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break;
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(*data++) = c;
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total_bytes_read++;
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}
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SHOWVALUE(total_bytes_read);
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result = total_bytes_read / element_size;
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}
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else
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{
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SHOWVALUE(element_size);
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SHOWVALUE(count);
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SHOWMSG("either element size or count is zero");
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/* Don't let this appear like an EOF or error. */
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clearerr((FILE *)file);
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}
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D(("total number of elements read = %ld",result));
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out:
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funlockfile(stream);
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RETURN(result);
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return(result);
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}
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