source: rtems/c/src/lib/libc/lseek.c @ 08311cc3

4.104.114.84.95
Last change on this file since 08311cc3 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 17, 1999 at 5:51:34 PM

Updated copyright notice.

  • Property mode set to 100644
File size: 1.3 KB
Line 
1/*
2 *  lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset
3 *
4 *  COPYRIGHT (c) 1989-1999.
5 *  On-Line Applications Research Corporation (OAR).
6 *
7 *  The license and distribution terms for this file may be
8 *  found in the file LICENSE in this distribution or at
9 *  http://www.OARcorp.com/rtems/license.html.
10 *
11 *  $Id$
12 */
13
14#include <stdio.h>
15
16#include "libio_.h"
17
18off_t lseek(
19  int     fd,
20  off_t   offset,
21  int     whence
22)
23{
24  rtems_libio_t *iop;
25
26  rtems_libio_check_fd( fd );
27  iop = rtems_libio_iop( fd );
28  rtems_libio_check_is_open(iop);
29
30  /*
31   *  Now process the lseek().
32   */
33
34  switch ( whence ) {
35    case SEEK_SET:
36      iop->offset = offset;
37      break;
38
39    case SEEK_CUR:
40      iop->offset += offset;
41      break;
42
43    case SEEK_END:
44      iop->offset = iop->size - offset;
45      break;
46
47    default:
48      errno = EINVAL;
49      return -1;
50  }
51
52  if ( !iop->handlers->lseek )
53    set_errno_and_return_minus_one( ENOTSUP );
54
55  return (*iop->handlers->lseek)( iop, offset, whence );
56}
57
58/*
59 *  _lseek_r
60 *
61 *  This is the Newlib dependent reentrant version of lseek().
62 */
63
64#if defined(RTEMS_NEWLIB)
65
66#include <reent.h>
67
68off_t _lseek_r( 
69  struct _reent *ptr,
70  int            fd,
71  off_t          offset,
72  int            whence
73)
74{
75  return lseek( fd, offset, whence );
76}
77#endif
78
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