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)
| 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)
|
44
45#include "namespace.h"
46#include <sys/types.h>
47#include <errno.h>
48#include <limits.h>
49#include <stdio.h>
50#include "un-namespace.h"
51#include "local.h"
52#include "libc_private.h"
53
54/*
55 * standard ftell function.
56 */
57long
58ftell(fp)
59 FILE *fp;
60{
61 off_t rv;
62
63 rv = ftello(fp);
64 if (rv > LONG_MAX) {
65 errno = EOVERFLOW;
66 return (-1);
67 }
68 return (rv);
69}
70
71/*
72 * ftello: return current offset.
73 */
74off_t
75ftello(fp)
76 FILE *fp;
77{
78 fpos_t rv;
79 int ret;
80
81 FLOCKFILE(fp);
82 ret = _ftello(fp, &rv);
83 FUNLOCKFILE(fp);
84 if (ret)
85 return (-1);
86 if (rv < 0) { /* Unspecified value because of ungetc() at 0 */
87 errno = ESPIPE;
88 return (-1);
89 }
90 return (rv);
91}
92
93int
94_ftello(fp, offset)
95 FILE *fp;
96 fpos_t *offset;
97{
98 fpos_t pos;
99 size_t n;
100
101 if (fp->_seek == NULL) {
102 errno = ESPIPE; /* historic practice */
103 return (1);
104 }
105
106 /*
107 * Find offset of underlying I/O object, then
108 * adjust for buffered bytes.
109 */
110 if (fp->_flags & __SOFF)
111 pos = fp->_offset;
112 else {
113 pos = _sseek(fp, (fpos_t)0, SEEK_CUR);
114 if (pos == -1)
115 return (1);
116 }
117 if (fp->_flags & __SRD) {
118 /*
119 * Reading. Any unread characters (including
120 * those from ungetc) cause the position to be
121 * smaller than that in the underlying object.
122 */
123 if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
124 fp->_flags |= __SERR;
125 errno = EIO;
126 return (1);
127 }
128 if (HASUB(fp))
129 pos -= fp->_r; /* Can be negative at this point. */
130 } else if ((fp->_flags & __SWR) && fp->_p != NULL) {
131 /*
132 * Writing. Any buffered characters cause the
133 * position to be greater than that in the
134 * underlying object.
135 */
136 n = fp->_p - fp->_bf._base;
137 if (pos > OFF_MAX - n) {
138 errno = EOVERFLOW;
139 return (1);
140 }
141 pos += n;
142 }
143 *offset = pos;
144 return (0);
145}
| 42
43#include "namespace.h"
44#include <sys/types.h>
45#include <errno.h>
46#include <limits.h>
47#include <stdio.h>
48#include "un-namespace.h"
49#include "local.h"
50#include "libc_private.h"
51
52/*
53 * standard ftell function.
54 */
55long
56ftell(fp)
57 FILE *fp;
58{
59 off_t rv;
60
61 rv = ftello(fp);
62 if (rv > LONG_MAX) {
63 errno = EOVERFLOW;
64 return (-1);
65 }
66 return (rv);
67}
68
69/*
70 * ftello: return current offset.
71 */
72off_t
73ftello(fp)
74 FILE *fp;
75{
76 fpos_t rv;
77 int ret;
78
79 FLOCKFILE(fp);
80 ret = _ftello(fp, &rv);
81 FUNLOCKFILE(fp);
82 if (ret)
83 return (-1);
84 if (rv < 0) { /* Unspecified value because of ungetc() at 0 */
85 errno = ESPIPE;
86 return (-1);
87 }
88 return (rv);
89}
90
91int
92_ftello(fp, offset)
93 FILE *fp;
94 fpos_t *offset;
95{
96 fpos_t pos;
97 size_t n;
98
99 if (fp->_seek == NULL) {
100 errno = ESPIPE; /* historic practice */
101 return (1);
102 }
103
104 /*
105 * Find offset of underlying I/O object, then
106 * adjust for buffered bytes.
107 */
108 if (fp->_flags & __SOFF)
109 pos = fp->_offset;
110 else {
111 pos = _sseek(fp, (fpos_t)0, SEEK_CUR);
112 if (pos == -1)
113 return (1);
114 }
115 if (fp->_flags & __SRD) {
116 /*
117 * Reading. Any unread characters (including
118 * those from ungetc) cause the position to be
119 * smaller than that in the underlying object.
120 */
121 if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
122 fp->_flags |= __SERR;
123 errno = EIO;
124 return (1);
125 }
126 if (HASUB(fp))
127 pos -= fp->_r; /* Can be negative at this point. */
128 } else if ((fp->_flags & __SWR) && fp->_p != NULL) {
129 /*
130 * Writing. Any buffered characters cause the
131 * position to be greater than that in the
132 * underlying object.
133 */
134 n = fp->_p - fp->_bf._base;
135 if (pos > OFF_MAX - n) {
136 errno = EOVERFLOW;
137 return (1);
138 }
139 pos += n;
140 }
141 *offset = pos;
142 return (0);
143}
|