forked from KolibriOS/kolibrios
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that the above copyright notice and this paragraph are
|
|
* duplicated in all such forms and that any documentation,
|
|
* advertising materials, and other materials related to such
|
|
* distribution and use acknowledge that the software was developed
|
|
* by the University of California, Berkeley. The name of the
|
|
* University may not be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
/* No user fns here. Pesch 15apr92. */
|
|
|
|
#include <_ansi.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include "local.h"
|
|
|
|
static int
|
|
_DEFUN(lflush, (fp),
|
|
FILE *fp)
|
|
{
|
|
if ((fp->_flags & (__SLBF | __SWR)) == (__SLBF | __SWR))
|
|
return fflush (fp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Refill a stdio buffer.
|
|
* Return EOF on eof or error, 0 otherwise.
|
|
*/
|
|
|
|
int
|
|
_DEFUN(__srefill_r, (ptr, fp),
|
|
struct _reent * ptr _AND
|
|
register FILE * fp)
|
|
{
|
|
/* make sure stdio is set up */
|
|
|
|
CHECK_INIT (ptr, fp);
|
|
|
|
ORIENT (fp, -1);
|
|
|
|
fp->_r = 0; /* largely a convenience for callers */
|
|
|
|
#ifndef __CYGWIN__
|
|
/* SysV does not make this test; take it out for compatibility */
|
|
if (fp->_flags & __SEOF)
|
|
return EOF;
|
|
#endif
|
|
|
|
/* if not already reading, have to be reading and writing */
|
|
if ((fp->_flags & __SRD) == 0)
|
|
{
|
|
if ((fp->_flags & __SRW) == 0)
|
|
{
|
|
ptr->_errno = EBADF;
|
|
fp->_flags |= __SERR;
|
|
return EOF;
|
|
}
|
|
/* switch to reading */
|
|
if (fp->_flags & __SWR)
|
|
{
|
|
if (_fflush_r (ptr, fp))
|
|
return EOF;
|
|
fp->_flags &= ~__SWR;
|
|
fp->_w = 0;
|
|
fp->_lbfsize = 0;
|
|
}
|
|
fp->_flags |= __SRD;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* We were reading. If there is an ungetc buffer,
|
|
* we must have been reading from that. Drop it,
|
|
* restoring the previous buffer (if any). If there
|
|
* is anything in that buffer, return.
|
|
*/
|
|
if (HASUB (fp))
|
|
{
|
|
FREEUB (ptr, fp);
|
|
if ((fp->_r = fp->_ur) != 0)
|
|
{
|
|
fp->_p = fp->_up;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (fp->_bf._base == NULL)
|
|
__smakebuf_r (ptr, fp);
|
|
|
|
/*
|
|
* Before reading from a line buffered or unbuffered file,
|
|
* flush all line buffered output files, per the ANSI C
|
|
* standard.
|
|
*/
|
|
if (fp->_flags & (__SLBF | __SNBF))
|
|
{
|
|
/* Ignore this file in _fwalk to avoid potential deadlock. */
|
|
short orig_flags = fp->_flags;
|
|
fp->_flags = 1;
|
|
_CAST_VOID _fwalk (_GLOBAL_REENT, lflush);
|
|
fp->_flags = orig_flags;
|
|
|
|
/* Now flush this file without locking it. */
|
|
if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
|
|
__sflush_r (ptr, fp);
|
|
}
|
|
|
|
fp->_p = fp->_bf._base;
|
|
fp->_r = fp->_read (ptr, fp->_cookie, (char *) fp->_p, fp->_bf._size);
|
|
#ifndef __CYGWIN__
|
|
if (fp->_r <= 0)
|
|
#else
|
|
if (fp->_r > 0)
|
|
fp->_flags &= ~__SEOF;
|
|
else
|
|
#endif
|
|
{
|
|
if (fp->_r == 0)
|
|
fp->_flags |= __SEOF;
|
|
else
|
|
{
|
|
fp->_r = 0;
|
|
fp->_flags |= __SERR;
|
|
}
|
|
return EOF;
|
|
}
|
|
return 0;
|
|
}
|