1 |
|
|
/* $OpenBSD: fflush.c,v 1.9 2015/08/31 02:53:57 guenther Exp $ */ |
2 |
|
|
/*- |
3 |
|
|
* Copyright (c) 1990, 1993 |
4 |
|
|
* The Regents of the University of California. All rights reserved. |
5 |
|
|
* |
6 |
|
|
* This code is derived from software contributed to Berkeley by |
7 |
|
|
* Chris Torek. |
8 |
|
|
* |
9 |
|
|
* Redistribution and use in source and binary forms, with or without |
10 |
|
|
* modification, are permitted provided that the following conditions |
11 |
|
|
* are met: |
12 |
|
|
* 1. Redistributions of source code must retain the above copyright |
13 |
|
|
* notice, this list of conditions and the following disclaimer. |
14 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
15 |
|
|
* notice, this list of conditions and the following disclaimer in the |
16 |
|
|
* documentation and/or other materials provided with the distribution. |
17 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
18 |
|
|
* may be used to endorse or promote products derived from this software |
19 |
|
|
* without specific prior written permission. |
20 |
|
|
* |
21 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
22 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
23 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
24 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
25 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
26 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
27 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
28 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
29 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
30 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
31 |
|
|
* SUCH DAMAGE. |
32 |
|
|
*/ |
33 |
|
|
|
34 |
|
|
#include <errno.h> |
35 |
|
|
#include <stdio.h> |
36 |
|
|
#include "local.h" |
37 |
|
|
|
38 |
|
|
/* Flush a single file, or (if fp is NULL) all files. */ |
39 |
|
|
int |
40 |
|
|
fflush(FILE *fp) |
41 |
|
|
{ |
42 |
|
|
int r; |
43 |
|
|
|
44 |
✗✓ |
12 |
if (fp == NULL) |
45 |
|
|
return (_fwalk(__sflush_locked)); |
46 |
✗✓ |
6 |
FLOCKFILE(fp); |
47 |
✗✓ |
6 |
if ((fp->_flags & (__SWR | __SRW)) == 0) { |
48 |
|
|
errno = EBADF; |
49 |
|
|
r = EOF; |
50 |
|
|
} else |
51 |
|
6 |
r = __sflush(fp); |
52 |
✗✓ |
6 |
FUNLOCKFILE(fp); |
53 |
|
6 |
return (r); |
54 |
|
6 |
} |
55 |
|
|
DEF_STRONG(fflush); |
56 |
|
|
|
57 |
|
|
int |
58 |
|
|
__sflush(FILE *fp) |
59 |
|
|
{ |
60 |
|
|
unsigned char *p; |
61 |
|
|
int n, t; |
62 |
|
|
|
63 |
|
2058 |
t = fp->_flags; |
64 |
✓✓ |
1029 |
if ((t & __SWR) == 0) |
65 |
|
964 |
return (0); |
66 |
|
|
|
67 |
✗✓ |
65 |
if ((p = fp->_bf._base) == NULL) |
68 |
|
|
return (0); |
69 |
|
|
|
70 |
|
65 |
n = fp->_p - p; /* write this much */ |
71 |
|
|
|
72 |
|
|
/* |
73 |
|
|
* Set these immediately to avoid problems with longjmp and to allow |
74 |
|
|
* exchange buffering (via setvbuf) in user write function. |
75 |
|
|
*/ |
76 |
|
65 |
fp->_p = p; |
77 |
✓✓ |
187 |
fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; |
78 |
|
|
|
79 |
✓✓ |
260 |
for (; n > 0; n -= t, p += t) { |
80 |
|
65 |
t = (*fp->_write)(fp->_cookie, (char *)p, n); |
81 |
✗✓ |
65 |
if (t <= 0) { |
82 |
|
|
fp->_flags |= __SERR; |
83 |
|
|
return (EOF); |
84 |
|
|
} |
85 |
|
|
} |
86 |
|
65 |
return (0); |
87 |
|
1029 |
} |
88 |
|
|
|
89 |
|
|
int |
90 |
|
|
__sflush_locked(FILE *fp) |
91 |
|
|
{ |
92 |
|
|
int r; |
93 |
|
|
|
94 |
|
|
FLOCKFILE(fp); |
95 |
|
|
r = __sflush(fp); |
96 |
|
|
FUNLOCKFILE(fp); |
97 |
|
|
return (r); |
98 |
|
|
} |