root / prex-0.9.0 / usr / lib / libc / stdio / fflush.c @ 03e9c04a
History | View | Annotate | Download (2.48 KB)
1 |
/*-
|
---|---|
2 |
* Copyright (c) 1990, 1993
|
3 |
* The Regents of the University of California. All rights reserved.
|
4 |
*
|
5 |
* This code is derived from software contributed to Berkeley by
|
6 |
* Chris Torek.
|
7 |
*
|
8 |
* Redistribution and use in source and binary forms, with or without
|
9 |
* modification, are permitted provided that the following conditions
|
10 |
* are met:
|
11 |
* 1. Redistributions of source code must retain the above copyright
|
12 |
* notice, this list of conditions and the following disclaimer.
|
13 |
* 2. Redistributions in binary form must reproduce the above copyright
|
14 |
* notice, this list of conditions and the following disclaimer in the
|
15 |
* documentation and/or other materials provided with the distribution.
|
16 |
* 3. Neither the name of the University nor the names of its contributors
|
17 |
* may be used to endorse or promote products derived from this software
|
18 |
* without specific prior written permission.
|
19 |
*
|
20 |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
21 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
22 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
23 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
24 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
25 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
26 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
27 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
28 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
29 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
30 |
* SUCH DAMAGE.
|
31 |
*/
|
32 |
|
33 |
#include <errno.h> |
34 |
#include <stdio.h> |
35 |
#include "local.h" |
36 |
|
37 |
/* Flush a single file, or (if fp is NULL) all files. */
|
38 |
int
|
39 |
fflush(fp) |
40 |
FILE *fp; |
41 |
{ |
42 |
|
43 |
if (fp == NULL) |
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(fp) |
54 |
FILE *fp; |
55 |
{ |
56 |
unsigned char *p; |
57 |
int n, t;
|
58 |
|
59 |
t = fp->_flags; |
60 |
if ((t & __SWR) == 0) |
61 |
return (0); |
62 |
|
63 |
if ((p = fp->_bf._base) == NULL) |
64 |
return (0); |
65 |
|
66 |
n = fp->_p - p; /* write this much */
|
67 |
|
68 |
/*
|
69 |
* Set these immediately to avoid problems with longjmp and to allow
|
70 |
* exchange buffering (via setvbuf) in user write function.
|
71 |
*/
|
72 |
fp->_p = p; |
73 |
fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
|
74 |
|
75 |
for (; n > 0; n -= t, p += t) { |
76 |
t = __swrite(fp, (char *)p, n);
|
77 |
if (t <= 0) { |
78 |
fp->_flags |= __SERR; |
79 |
return (EOF); |
80 |
} |
81 |
} |
82 |
return (0); |
83 |
} |