Annotation of prex-old/usr/lib/libc/stdio/fflush.c, Revision 1.1.1.1
1.1 nbrk 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: }
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