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1 | /* $OpenBSD: fflush.c,v 1.7 2009/10/22 01:23:16 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 ust_safe_fflush(LFILE *fp) | |
40 | { | |
41 | ||
42 | if (fp == NULL) | |
43 | return 0; | |
44 | // return (_fwalk(__sflush)); | |
45 | if ((fp->_flags & (__SWR | __SRW)) == 0) { | |
46 | errno = EBADF; | |
47 | return (EOF); | |
48 | } | |
49 | return (__sflush(fp)); | |
50 | } | |
51 | ||
52 | int | |
53 | __sflush(LFILE *fp) | |
54 | { | |
55 | unsigned char *p; | |
56 | int n, t; | |
57 | ||
58 | t = fp->_flags; | |
59 | if ((t & __SWR) == 0) | |
60 | return (0); | |
61 | ||
62 | if ((p = fp->_bf._base) == NULL) | |
63 | return (0); | |
64 | ||
65 | n = fp->_p - p; /* write this much */ | |
66 | ||
67 | /* | |
68 | * Set these immediately to avoid problems with longjmp and to allow | |
69 | * exchange buffering (via setvbuf) in user write function. | |
70 | */ | |
71 | fp->_p = p; | |
72 | fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; | |
73 | ||
74 | for (; n > 0; n -= t, p += t) { | |
75 | t = (*fp->_write)(fp->_cookie, (char *)p, n); | |
76 | if (t <= 0) { | |
77 | fp->_flags |= __SERR; | |
78 | return (EOF); | |
79 | } | |
80 | } | |
81 | return (0); | |
82 | } |