2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 4. 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.
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
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include "namespace.h"
43 #include "un-namespace.h"
45 #include "libc_private.h"
48 static int lflush(FILE *);
55 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {
64 * Refill a stdio buffer.
65 * Return EOF on eof or error, 0 otherwise.
71 /* make sure stdio is set up */
77 fp->_r = 0; /* largely a convenience for callers */
79 /* SysV does not make this test; take it out for compatibility */
80 if (fp->_flags & __SEOF)
83 /* if not already reading, have to be reading and writing */
84 if ((fp->_flags & __SRD) == 0) {
85 if ((fp->_flags & __SRW) == 0) {
90 /* switch to reading */
91 if (fp->_flags & __SWR) {
101 * We were reading. If there is an ungetc buffer,
102 * we must have been reading from that. Drop it,
103 * restoring the previous buffer (if any). If there
104 * is anything in that buffer, return.
108 if ((fp->_r = fp->_ur) != 0) {
115 if (fp->_bf._base == NULL)
119 * Before reading from a line buffered or unbuffered file,
120 * flush all line buffered output files, per the ANSI C
123 if (fp->_flags & (__SLBF|__SNBF)) {
124 /* Ignore this file in _fwalk to avoid potential deadlock. */
125 fp->_flags |= __SIGN;
126 (void) _fwalk(lflush);
127 fp->_flags &= ~__SIGN;
129 /* Now flush this file without locking it. */
130 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
133 fp->_p = fp->_bf._base;
134 fp->_r = _sread(fp, (char *)fp->_p, fp->_bf._size);
135 fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
138 fp->_flags |= __SEOF;
141 fp->_flags |= __SERR;