library/stdio_fgetc.c
/*
* $Id: stdio_fgetc.c,v 1.8 2006-01-08 12:04:24 obarthel Exp $
*
* :ts=4
*
* Portable ISO 'C' (1994) runtime library for the Amiga computer
* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Neither the name of Olaf Barthel nor the names of contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _STDLIB_NULL_POINTER_CHECK_H
#include "stdlib_null_pointer_check.h"
#endif /* _STDLIB_NULL_POINTER_CHECK_H */
/****************************************************************************/
#ifndef _STDIO_HEADERS_H
#include "stdio_headers.h"
#endif /* _STDIO_HEADERS_H */
/****************************************************************************/
int
__fgetc(FILE *stream)
{
struct iob * file = (struct iob *)stream;
int result = EOF;
assert( stream != NULL );
assert( __is_valid_iob(file) );
assert( FLAG_IS_SET(file->iob_Flags,IOBF_IN_USE) );
assert( file->iob_BufferSize > 0 );
if(__iob_read_buffer_is_empty(file))
{
if(__check_abort_enabled)
__check_abort();
if(__fill_iob_read_buffer(file) < 0)
goto out;
if(__iob_read_buffer_is_empty(file))
{
SET_FLAG(file->iob_Flags,IOBF_EOF_REACHED);
goto out;
}
}
result = file->iob_Buffer[file->iob_BufferPosition++];
out:
return(result);
}
/****************************************************************************/
int
__fgetc_check(FILE * stream)
{
struct iob * file = (struct iob *)stream;
int result = EOF;
assert( stream != NULL );
#if defined(CHECK_FOR_NULL_POINTERS)
{
if(stream == NULL)
{
__set_errno(EFAULT);
goto out;
}
}
#endif /* CHECK_FOR_NULL_POINTERS */
assert( FLAG_IS_SET(file->iob_Flags,IOBF_IN_USE) );
assert( file->iob_BufferSize > 0 );
if(FLAG_IS_CLEAR(file->iob_Flags,IOBF_IN_USE))
{
SHOWMSG("this file is not even in use");
SET_FLAG(file->iob_Flags,IOBF_ERROR);
__set_errno(EBADF);
goto out;
}
if(FLAG_IS_CLEAR(file->iob_Flags,IOBF_READ))
{
SET_FLAG(file->iob_Flags,IOBF_ERROR);
__set_errno(EBADF);
goto out;
}
if(__iob_write_buffer_is_valid(file) && __flush_iob_write_buffer(file) < 0)
goto out;
result = OK;
out:
return(result);
}
/****************************************************************************/
int
fgetc(FILE *stream)
{
int result = EOF;
assert( stream != NULL );
if(__check_abort_enabled)
__check_abort();
flockfile(stream);
#if defined(CHECK_FOR_NULL_POINTERS)
{
if(stream == NULL)
{
__set_errno(EFAULT);
goto out;
}
}
#endif /* CHECK_FOR_NULL_POINTERS */
if(__fgetc_check(stream) < 0)
goto out;
result = __getc(stream);
out:
funlockfile(stream);
return(result);
}