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1 | /* |
1 | /* |
2 | * Copyright (c) 2002, Red Hat Inc. |
2 | * Copyright (c) 1990 The Regents of the University of California. |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms are permitted |
5 | * Redistribution and use in source and binary forms are permitted |
6 | * provided that the above copyright notice and this paragraph are |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, |
7 | * duplicated in all such forms and that any documentation, |
Line 13... | Line 13... | ||
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
16 | */ |
16 | */ |
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- | 17 | ||
- | 18 | /* |
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- | 19 | FUNCTION |
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- | 20 | < |
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- | 21 | ||
- | 22 | INDEX |
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- | 23 | ftell |
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- | 24 | INDEX |
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- | 25 | ftello |
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- | 26 | INDEX |
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- | 27 | _ftell_r |
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- | 28 | INDEX |
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- | 29 | _ftello_r |
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- | 30 | ||
- | 31 | ANSI_SYNOPSIS |
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- | 32 | #include |
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- | 33 | long ftell(FILE *<[fp]>); |
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- | 34 | off_t ftello(FILE *<[fp]>); |
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- | 35 | long _ftell_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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- | 36 | off_t _ftello_r(struct _reent *<[ptr]>, FILE *<[fp]>); |
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- | 37 | ||
- | 38 | TRAD_SYNOPSIS |
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- | 39 | #include |
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- | 40 | long ftell(<[fp]>) |
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- | 41 | FILE *<[fp]>; |
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- | 42 | ||
- | 43 | off_t ftello(<[fp]>) |
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- | 44 | FILE *<[fp]>; |
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- | 45 | ||
- | 46 | long _ftell_r(<[ptr]>, <[fp]>) |
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- | 47 | struct _reent *<[ptr]>; |
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- | 48 | FILE *<[fp]>; |
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- | 49 | ||
- | 50 | off_t _ftello_r(<[ptr]>, <[fp]>) |
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- | 51 | struct _reent *<[ptr]>; |
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- | 52 | FILE *<[fp]>; |
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- | 53 | ||
- | 54 | DESCRIPTION |
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- | 55 | Objects of type < |
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- | 56 | of the file your program has already read. Many of the < |
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- | 57 | depend on this position, and many change it as a side effect. |
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- | 58 | ||
- | 59 | The result of < |
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- | 60 | identified by <[fp]>. If you record this result, you can later |
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- | 61 | use it with < |
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- | 62 | position. The difference between < |
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- | 63 | < |
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- | 64 | ||
- | 65 | In the current implementation, < |
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- | 66 | count to represent the file position; this is the same number that |
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- | 67 | would be recorded by < |
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- | 68 | ||
- | 69 | RETURNS |
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- | 70 | < |
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- | 71 | this, they return <<-1L>>. Failure occurs on streams that do not support |
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- | 72 | positioning; the global < |
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- | 73 | value < |
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- | 74 | ||
- | 75 | PORTABILITY |
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- | 76 | < |
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- | 77 | result (when successful) is not specified beyond requiring that it be |
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- | 78 | acceptable as an argument to < |
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- | 79 | conforming C implementations may return a different result from |
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- | 80 | < |
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- | 81 | ||
- | 82 | < |
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- | 83 | ||
- | 84 | No supporting OS subroutines are required. |
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- | 85 | */ |
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- | 86 | ||
- | 87 | #if defined(LIBC_SCCS) && !defined(lint) |
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- | 88 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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- | 89 | #endif /* LIBC_SCCS and not lint */ |
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- | 90 | ||
- | 91 | /* |
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- | 92 | * ftello: return current offset. |
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- | 93 | */ |
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17 | 94 | ||
18 | #include <_ansi.h> |
95 | #include <_ansi.h> |
19 | #include |
96 | #include |
- | 97 | #include |
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- | 98 | #include |
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Line 20... | Line 99... | ||
20 | #include |
99 | #include "local.h" |
21 | 100 | ||
22 | _off_t |
101 | _off_t |
23 | _DEFUN(_ftello_r, (ptr, fp), |
102 | _DEFUN(_ftello_r, (ptr, fp), |
24 | struct _reent * ptr _AND |
103 | struct _reent * ptr _AND |
- | 104 | register FILE * fp) |
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- | 105 | { |
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- | 106 | _fpos_t pos; |
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- | 107 | ||
- | 108 | /* Ensure stdio is set up. */ |
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- | 109 | ||
- | 110 | CHECK_INIT (ptr, fp); |
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- | 111 | ||
- | 112 | _newlib_flockfile_start (fp); |
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- | 113 | ||
- | 114 | if (fp->_seek == NULL) |
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- | 115 | { |
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- | 116 | ptr->_errno = ESPIPE; |
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- | 117 | _newlib_flockfile_exit (fp); |
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- | 118 | return -1L; |
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- | 119 | } |
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25 | register FILE * fp) |
120 | |
- | 121 | /* Find offset of underlying I/O object, then adjust for buffered |
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- | 122 | bytes. Flush a write stream, since the offset may be altered if |
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- | 123 | the stream is appending. Do not flush a read stream, since we |
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26 | { |
124 | must not lose the ungetc buffer. */ |
- | 125 | if (fp->_flags & __SWR) |
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- | 126 | _fflush_r (ptr, fp); |
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- | 127 | if (fp->_flags & __SOFF) |
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- | 128 | pos = fp->_offset; |
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- | 129 | else |
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- | 130 | { |
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- | 131 | pos = fp->_seek (ptr, fp->_cookie, (_fpos_t) 0, SEEK_CUR); |
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- | 132 | if (pos == -1L) |
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- | 133 | { |
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- | 134 | _newlib_flockfile_exit (fp); |
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- | 135 | return pos; |
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- | 136 | } |
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- | 137 | } |
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- | 138 | if (fp->_flags & __SRD) |
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- | 139 | { |
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- | 140 | /* |
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- | 141 | * Reading. Any unread characters (including |
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- | 142 | * those from ungetc) cause the position to be |
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- | 143 | * smaller than that in the underlying object. |
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- | 144 | */ |
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- | 145 | pos -= fp->_r; |
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- | 146 | if (HASUB (fp)) |
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- | 147 | pos -= fp->_ur; |
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- | 148 | } |
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- | 149 | else if ((fp->_flags & __SWR) && fp->_p != NULL) |
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- | 150 | { |
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- | 151 | /* |
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- | 152 | * Writing. Any buffered characters cause the |
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- | 153 | * position to be greater than that in the |
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- | 154 | * underlying object. |
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- | 155 | */ |
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- | 156 | pos += fp->_p - fp->_bf._base; |
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- | 157 | } |
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- | 158 | ||
27 | /* for now we simply cast since off_t should be long */ |
159 | _newlib_flockfile_end (fp); |
Line 28... | Line 160... | ||
28 | return (_off_t)_ftell_r (ptr, fp); |
160 | return pos; |
Line 29... | Line 161... | ||
29 | } |
161 | } |
30 | 162 | ||
31 | #ifndef _REENT_ONLY |
163 | #ifndef _REENT_ONLY |
32 | 164 | ||
33 | _off_t |
165 | _off_t |
34 | _DEFUN(ftello, (fp), |
166 | _DEFUN(ftello, (fp), |
Line 35... | Line 167... | ||
35 | register FILE * fp) |
167 | register FILE * fp) |