WebSVN – Kolibri OS – Diff – /contrib/sdk/sources/newlib/libc/stdio/fseek.c


/*
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
 
/*
FUNCTION
<>, <>---set file position
 
INDEX
	fseek
INDEX
	fseeko
INDEX
	_fseek_r
INDEX
	_fseeko_r
 
ANSI_SYNOPSIS
	#include 
	int fseek(FILE *<[fp]>, long <[offset]>, int <[whence]>);
	int fseeko(FILE *<[fp]>, off_t <[offset]>, int <[whence]>);
	int _fseek_r(struct _reent *<[ptr]>, FILE *<[fp]>,
	             long <[offset]>, int <[whence]>);
	int _fseeko_r(struct _reent *<[ptr]>, FILE *<[fp]>,
	             off_t <[offset]>, int <[whence]>);
 
TRAD_SYNOPSIS
	#include 
	int fseek(<[fp]>, <[offset]>, <[whence]>);
	FILE *<[fp]>;
	long <[offset]>;
	int <[whence]>;
 
	int fseeko(<[fp]>, <[offset]>, <[whence]>);
	FILE *<[fp]>;
	off_t <[offset]>;
	int <[whence]>;
 
	int _fseek_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>);
	struct _reent *<[ptr]>;
	FILE *<[fp]>;
	long <[offset]>;
	int <[whence]>;
 
	int _fseeko_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>);
	struct _reent *<[ptr]>;
	FILE *<[fp]>;
	off_t <[offset]>;
	int <[whence]>;
 
DESCRIPTION
Objects of type <> can have a ``position'' that records how much
of the file your program has already read.  Many of the <> functions
depend on this position, and many change it as a side effect.
 
You can use <>/<> to set the position for the file identified by
<[fp]>.  The value of <[offset]> determines the new position, in one
of three ways selected by the value of <[whence]> (defined as macros
in `<>'):
 
<>---<[offset]> is the absolute file position (an offset
from the beginning of the file) desired.  <[offset]> must be positive.
 
<>---<[offset]> is relative to the current file position.
<[offset]> can meaningfully be either positive or negative.
 
<>---<[offset]> is relative to the current end of file.
<[offset]> can meaningfully be either positive (to increase the size
of the file) or negative.
 
See <>/<> to determine the current file position.
 
RETURNS
<>/<> return <<0>> when successful.  On failure, the
result is <>.  The reason for failure is indicated in <>:
either <> (the stream identified by <[fp]> doesn't support
repositioning) or <> (invalid file position).
 
PORTABILITY
ANSI C requires <>.
 
<> is defined by the Single Unix specification.
 
Supporting OS subroutines required: <>, <>, <>,
<>, <>, <>, <>.
*/
 
#include <_ansi.h>
#include 
#include 
#include 
#include "local.h"
 
int
_DEFUN(_fseek_r, (ptr, fp, offset, whence),
       struct _reent *ptr _AND
       register FILE *fp  _AND
       long offset        _AND
       int whence)
{
  return _fseeko_r (ptr, fp, offset, whence);
}
 
#ifndef _REENT_ONLY
 
int
_DEFUN(fseek, (fp, offset, whence),
       register FILE *fp _AND
       long offset       _AND
       int whence)
{
  return _fseek_r (_REENT, fp, offset, whence);
}
 
#endif /* !_REENT_ONLY */

Rev 4921	Rev 6099
1	/*	1	/*
2	* Copyright (c) 1990 The Regents of the University of California.	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,
8	* advertising materials, and other materials related to such	8	* advertising materials, and other materials related to such
9	* distribution and use acknowledge that the software was developed	9	* distribution and use acknowledge that the software was developed
10	* by the University of California, Berkeley. The name of the	10	* by the University of California, Berkeley. The name of the
11	* University may not be used to endorse or promote products derived	11	* University may not be used to endorse or promote products derived
12	* from this software without specific prior written permission.	12	* from this software without specific prior written permission.
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	*/
17		17
18	/*	18	/*
19	FUNCTION	19	FUNCTION
20	<>, <>---set file position	20	<>, <>---set file position
21		21
22	INDEX	22	INDEX
23	fseek	23	fseek
24	INDEX	24	INDEX
25	fseeko	25	fseeko
26	INDEX	26	INDEX
27	_fseek_r	27	_fseek_r
28	INDEX	28	INDEX
29	_fseeko_r	29	_fseeko_r
30		30
31	ANSI_SYNOPSIS	31	ANSI_SYNOPSIS
32	#include	32	#include
33	int fseek(FILE *<[fp]>, long <[offset]>, int <[whence]>)	33	int fseek(FILE *<[fp]>, long <[offset]>, int <[whence]>);
34	int fseeko(FILE *<[fp]>, off_t <[offset]>, int <[whence]>)	34	int fseeko(FILE *<[fp]>, off_t <[offset]>, int <[whence]>);
35	int _fseek_r(struct _reent <[ptr]>, FILE <[fp]>,	35	int _fseek_r(struct _reent <[ptr]>, FILE <[fp]>,
36	long <[offset]>, int <[whence]>)	36	long <[offset]>, int <[whence]>);
37	int _fseeko_r(struct _reent <[ptr]>, FILE <[fp]>,	37	int _fseeko_r(struct _reent <[ptr]>, FILE <[fp]>,
38	off_t <[offset]>, int <[whence]>)	38	off_t <[offset]>, int <[whence]>);
39		39
40	TRAD_SYNOPSIS	40	TRAD_SYNOPSIS
41	#include	41	#include
42	int fseek(<[fp]>, <[offset]>, <[whence]>)	42	int fseek(<[fp]>, <[offset]>, <[whence]>);
43	FILE *<[fp]>;	43	FILE *<[fp]>;
44	long <[offset]>;	44	long <[offset]>;
45	int <[whence]>;	45	int <[whence]>;
46		46
47	int fseeko(<[fp]>, <[offset]>, <[whence]>)	47	int fseeko(<[fp]>, <[offset]>, <[whence]>);
48	FILE *<[fp]>;	48	FILE *<[fp]>;
49	off_t <[offset]>;	49	off_t <[offset]>;
50	int <[whence]>;	50	int <[whence]>;
51		51
52	int _fseek_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>)	52	int _fseek_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>);
53	struct _reent *<[ptr]>;	53	struct _reent *<[ptr]>;
54	FILE *<[fp]>;	54	FILE *<[fp]>;
55	long <[offset]>;	55	long <[offset]>;
56	int <[whence]>;	56	int <[whence]>;
57		57
58	int _fseeko_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>)	58	int _fseeko_r(<[ptr]>, <[fp]>, <[offset]>, <[whence]>);
59	struct _reent *<[ptr]>;	59	struct _reent *<[ptr]>;
60	FILE *<[fp]>;	60	FILE *<[fp]>;
61	off_t <[offset]>;	61	off_t <[offset]>;
62	int <[whence]>;	62	int <[whence]>;
63		63
64	DESCRIPTION	64	DESCRIPTION
65	Objects of type <> can have a ``position'' that records how much	65	Objects of type <> can have a ``position'' that records how much
66	of the file your program has already read. Many of the <> functions	66	of the file your program has already read. Many of the <> functions
67	depend on this position, and many change it as a side effect.	67	depend on this position, and many change it as a side effect.
68		68
69	You can use <>/<> to set the position for the file identified by	69	You can use <>/<> to set the position for the file identified by
70	<[fp]>. The value of <[offset]> determines the new position, in one	70	<[fp]>. The value of <[offset]> determines the new position, in one
71	of three ways selected by the value of <[whence]> (defined as macros	71	of three ways selected by the value of <[whence]> (defined as macros
72	in `<>'):	72	in `<>'):
73		73
74	<>---<[offset]> is the absolute file position (an offset	74	<>---<[offset]> is the absolute file position (an offset
75	from the beginning of the file) desired. <[offset]> must be positive.	75	from the beginning of the file) desired. <[offset]> must be positive.
76		76
77	<>---<[offset]> is relative to the current file position.	77	<>---<[offset]> is relative to the current file position.
78	<[offset]> can meaningfully be either positive or negative.	78	<[offset]> can meaningfully be either positive or negative.
79		79
80	<>---<[offset]> is relative to the current end of file.	80	<>---<[offset]> is relative to the current end of file.
81	<[offset]> can meaningfully be either positive (to increase the size	81	<[offset]> can meaningfully be either positive (to increase the size
82	of the file) or negative.	82	of the file) or negative.
83		83
84	See <>/<> to determine the current file position.	84	See <>/<> to determine the current file position.
85		85
86	RETURNS	86	RETURNS
87	<>/<> return <<0>> when successful. On failure, the	87	<>/<> return <<0>> when successful. On failure, the
88	result is <>. The reason for failure is indicated in <>:	88	result is <>. The reason for failure is indicated in <>:
89	either <> (the stream identified by <[fp]> doesn't support	89	either <> (the stream identified by <[fp]> doesn't support
90	repositioning) or <> (invalid file position).	90	repositioning) or <> (invalid file position).
91		91
92	PORTABILITY	92	PORTABILITY
93	ANSI C requires <>.	93	ANSI C requires <>.
94		94
95	<> is defined by the Single Unix specification.	95	<> is defined by the Single Unix specification.
96		96
97	Supporting OS subroutines required: <>, <>, <>,	97	Supporting OS subroutines required: <>, <>, <>,
98	<>, <>, <>, <>.	98	<>, <>, <>, <>.
99	*/	99	*/
100		100
101	#include <_ansi.h>	101	#include <_ansi.h>
102	#include	102	#include
103	#include	103	#include
104	#include	104	#include
105	#include "local.h"	105	#include "local.h"
106		106
107	int	107	int
108	_DEFUN(_fseek_r, (ptr, fp, offset, whence),	108	_DEFUN(_fseek_r, (ptr, fp, offset, whence),
109	struct _reent *ptr _AND	109	struct _reent *ptr _AND
110	register FILE *fp _AND	110	register FILE *fp _AND
111	long offset _AND	111	long offset _AND
112	int whence)	112	int whence)
113	{	113	{
114	return _fseeko_r (ptr, fp, offset, whence);	114	return _fseeko_r (ptr, fp, offset, whence);
115	}	115	}
116		116
117	#ifndef _REENT_ONLY	117	#ifndef _REENT_ONLY
118		118
119	int	119	int
120	_DEFUN(fseek, (fp, offset, whence),	120	_DEFUN(fseek, (fp, offset, whence),
121	register FILE *fp _AND	121	register FILE *fp _AND
122	long offset _AND	122	long offset _AND
123	int whence)	123	int whence)
124	{	124	{
125	return _fseek_r (_REENT, fp, offset, whence);	125	return _fseek_r (_REENT, fp, offset, whence);
126	}	126	}
127		127
128	#endif /* !_REENT_ONLY */	128	#endif /* !_REENT_ONLY */

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(root)/contrib/sdk/sources/newlib/libc/stdio/fseek.c – Rev 4921 → 6099