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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
40#endif
41static const char rcsid[] =
| 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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
40#endif
41static const char rcsid[] =
|
43#endif /* LIBC_SCCS and not lint */
44
45#include "namespace.h"
46#include <errno.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include "un-namespace.h"
50
51#include "libc_private.h"
52#include "local.h"
53
54static int lflush __P((FILE *));
55
56static int
57lflush(FILE *fp)
58{
59 int ret = 0;
60
61 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {
62 FLOCKFILE(fp);
63 ret = __sflush(fp);
64 FUNLOCKFILE(fp);
65 }
66 return (ret);
67}
68
69/*
70 * Refill a stdio buffer.
71 * Return EOF on eof or error, 0 otherwise.
72 */
73int
74__srefill(FILE *fp)
75{
76 /* make sure stdio is set up */
77 if (!__sdidinit)
78 __sinit();
79
80 fp->_r = 0; /* largely a convenience for callers */
81
82 /* SysV does not make this test; take it out for compatibility */
83 if (fp->_flags & __SEOF)
84 return (EOF);
85
86 /* if not already reading, have to be reading and writing */
87 if ((fp->_flags & __SRD) == 0) {
88 if ((fp->_flags & __SRW) == 0) {
89 errno = EBADF;
90 fp->_flags |= __SERR;
91 return (EOF);
92 }
93 /* switch to reading */
94 if (fp->_flags & __SWR) {
95 if (__sflush(fp))
96 return (EOF);
97 fp->_flags &= ~__SWR;
98 fp->_w = 0;
99 fp->_lbfsize = 0;
100 }
101 fp->_flags |= __SRD;
102 } else {
103 /*
104 * We were reading. If there is an ungetc buffer,
105 * we must have been reading from that. Drop it,
106 * restoring the previous buffer (if any). If there
107 * is anything in that buffer, return.
108 */
109 if (HASUB(fp)) {
110 FREEUB(fp);
111 if ((fp->_r = fp->_ur) != 0) {
| 43#endif /* LIBC_SCCS and not lint */
44
45#include "namespace.h"
46#include <errno.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include "un-namespace.h"
50
51#include "libc_private.h"
52#include "local.h"
53
54static int lflush __P((FILE *));
55
56static int
57lflush(FILE *fp)
58{
59 int ret = 0;
60
61 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {
62 FLOCKFILE(fp);
63 ret = __sflush(fp);
64 FUNLOCKFILE(fp);
65 }
66 return (ret);
67}
68
69/*
70 * Refill a stdio buffer.
71 * Return EOF on eof or error, 0 otherwise.
72 */
73int
74__srefill(FILE *fp)
75{
76 /* make sure stdio is set up */
77 if (!__sdidinit)
78 __sinit();
79
80 fp->_r = 0; /* largely a convenience for callers */
81
82 /* SysV does not make this test; take it out for compatibility */
83 if (fp->_flags & __SEOF)
84 return (EOF);
85
86 /* if not already reading, have to be reading and writing */
87 if ((fp->_flags & __SRD) == 0) {
88 if ((fp->_flags & __SRW) == 0) {
89 errno = EBADF;
90 fp->_flags |= __SERR;
91 return (EOF);
92 }
93 /* switch to reading */
94 if (fp->_flags & __SWR) {
95 if (__sflush(fp))
96 return (EOF);
97 fp->_flags &= ~__SWR;
98 fp->_w = 0;
99 fp->_lbfsize = 0;
100 }
101 fp->_flags |= __SRD;
102 } else {
103 /*
104 * We were reading. If there is an ungetc buffer,
105 * we must have been reading from that. Drop it,
106 * restoring the previous buffer (if any). If there
107 * is anything in that buffer, return.
108 */
109 if (HASUB(fp)) {
110 FREEUB(fp);
111 if ((fp->_r = fp->_ur) != 0) {
|
113 return (0);
114 }
115 }
116 }
117
118 if (fp->_bf._base == NULL)
119 __smakebuf(fp);
120
121 /*
122 * Before reading from a line buffered or unbuffered file,
123 * flush all line buffered output files, per the ANSI C
124 * standard.
125 */
126 if (fp->_flags & (__SLBF|__SNBF)) {
127 /* Ignore this file in _fwalk to avoid potential deadlock. */
128 fp->_flags |= __SIGN;
129 (void) _fwalk(lflush);
130 fp->_flags &= ~__SIGN;
131
132 /* Now flush this file without locking it. */
133 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
134 __sflush(fp);
135 }
136 fp->_p = fp->_bf._base;
137 fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
138 fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
139 if (fp->_r <= 0) {
140 if (fp->_r == 0)
141 fp->_flags |= __SEOF;
142 else {
143 fp->_r = 0;
144 fp->_flags |= __SERR;
145 }
146 return (EOF);
147 }
148 return (0);
149}
| 113 return (0);
114 }
115 }
116 }
117
118 if (fp->_bf._base == NULL)
119 __smakebuf(fp);
120
121 /*
122 * Before reading from a line buffered or unbuffered file,
123 * flush all line buffered output files, per the ANSI C
124 * standard.
125 */
126 if (fp->_flags & (__SLBF|__SNBF)) {
127 /* Ignore this file in _fwalk to avoid potential deadlock. */
128 fp->_flags |= __SIGN;
129 (void) _fwalk(lflush);
130 fp->_flags &= ~__SIGN;
131
132 /* Now flush this file without locking it. */
133 if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
134 __sflush(fp);
135 }
136 fp->_p = fp->_bf._base;
137 fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
138 fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
139 if (fp->_r <= 0) {
140 if (fp->_r == 0)
141 fp->_flags |= __SEOF;
142 else {
143 fp->_r = 0;
144 fp->_flags |= __SERR;
145 }
146 return (EOF);
147 }
148 return (0);
149}
|