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ftell.c (268992) ftell.c (268997)
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

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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)ftell.c 8.2 (Berkeley) 5/4/95";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
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

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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)ftell.c 8.2 (Berkeley) 5/4/95";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/lib/libc/stdio/ftell.c 268992 2014-07-22 20:13:46Z ache $");
37__FBSDID("$FreeBSD: head/lib/libc/stdio/ftell.c 268997 2014-07-22 22:49:37Z ache $");
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <errno.h>
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <errno.h>
42#include <fcntl.h>
42#include <limits.h>
43#include <stdio.h>
44#include "un-namespace.h"
45#include "local.h"
46#include "libc_private.h"
47
48/*
49 * standard ftell function.

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82 return (rv);
83}
84
85int
86_ftello(FILE *fp, fpos_t *offset)
87{
88 fpos_t pos;
89 size_t n;
43#include <limits.h>
44#include <stdio.h>
45#include "un-namespace.h"
46#include "local.h"
47#include "libc_private.h"
48
49/*
50 * standard ftell function.

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83 return (rv);
84}
85
86int
87_ftello(FILE *fp, fpos_t *offset)
88{
89 fpos_t pos;
90 size_t n;
91 int dflags;
90
91 if (fp->_seek == NULL) {
92 errno = ESPIPE; /* historic practice */
93 return (1);
94 }
95
96 /*
97 * Find offset of underlying I/O object, then

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113 if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
114 fp->_flags |= __SERR;
115 errno = EIO;
116 return (1);
117 }
118 if (HASUB(fp))
119 pos -= fp->_r; /* Can be negative at this point. */
120 } else if ((fp->_flags & __SWR) && fp->_p != NULL) {
92
93 if (fp->_seek == NULL) {
94 errno = ESPIPE; /* historic practice */
95 return (1);
96 }
97
98 /*
99 * Find offset of underlying I/O object, then

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115 if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
116 fp->_flags |= __SERR;
117 errno = EIO;
118 return (1);
119 }
120 if (HASUB(fp))
121 pos -= fp->_r; /* Can be negative at this point. */
122 } else if ((fp->_flags & __SWR) && fp->_p != NULL) {
123 dflags = 0;
124 if (fp->_flags & __SAPP)
125 dflags = O_APPEND;
126 else if (fp->_file != -1 &&
127 (dflags = _fcntl(fp->_file, F_GETFL)) < 0)
128 return (1);
129 if ((dflags & O_APPEND) &&
130 (pos = _sseek(fp, (fpos_t)0, SEEK_END)) == -1) {
131 if ((fp->_flags & __SOPT) || __sflush(fp) ||
132 (pos = _sseek(fp, (fpos_t)0, SEEK_CUR)) == -1)
133 return (1);
134 else {
135 *offset = pos;
136 return (0);
137 }
138 }
121 /*
122 * Writing. Any buffered characters cause the
123 * position to be greater than that in the
124 * underlying object.
125 */
126 n = fp->_p - fp->_bf._base;
127 if (pos > OFF_MAX - n) {
128 errno = EOVERFLOW;
129 return (1);
130 }
131 pos += n;
132 }
133 *offset = pos;
134 return (0);
135}
139 /*
140 * Writing. Any buffered characters cause the
141 * position to be greater than that in the
142 * underlying object.
143 */
144 n = fp->_p - fp->_bf._base;
145 if (pos > OFF_MAX - n) {
146 errno = EOVERFLOW;
147 return (1);
148 }
149 pos += n;
150 }
151 *offset = pos;
152 return (0);
153}