0,0 → 1,138 |
/* |
* 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; |
} |