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/* _PDCLIB_prepread( struct _PDCLIB_file_t * )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#include <stdio.h>
#ifndef REGTEST
#include "pdclib/_PDCLIB_glue.h"
int _PDCLIB_prepread( struct _PDCLIB_file_t * stream )
{
if ( ( stream->bufidx > stream->bufend ) ||
( stream->status & ( _PDCLIB_FWRITE | _PDCLIB_FAPPEND | _PDCLIB_ERRORFLAG | _PDCLIB_WIDESTREAM | _PDCLIB_EOFFLAG ) ) ||
! ( stream->status & ( _PDCLIB_FREAD | _PDCLIB_FRW ) ) )
{
/* Function called on illegal (e.g. output) stream.
See comments on implementation-defined errno values in
<_PDCLIB_config.h>.
*/
_PDCLIB_errno = _PDCLIB_ERROR;
stream->status |= _PDCLIB_ERRORFLAG;
return EOF;
}
stream->status |= _PDCLIB_FREAD | _PDCLIB_BYTESTREAM;
if ( ( stream->bufidx == stream->bufend ) && ( stream->ungetidx == 0 ) )
{
return _PDCLIB_fillbuffer( stream );
}
else
{
return 0;
}
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
/* Testing covered by ftell.c */
return TEST_RESULTS;
}
#endif
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