| 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; |
| } |