forked from Imagelibrary/rtems
9c3fa30a11
* libc/libio.h (rtems_filesystem_file_handlers_r, rtems_filesystem_operations_table): Added _h to all structure fields to indicate they are "handlers". * libc/libio_.h, libc/chdir.c, libc/chmod.c, libc/chown.c, libc/close.c, libc/eval.c, libc/fchdir.c, libc/fchmod.c, libc/fcntl.c, libc/fdatasync.c, libc/fstat.c, libc/fsync.c, libc/ftruncate.c, libc/getdents.c, libc/imfs_eval.c, libc/imfs_unlink.c, libc/ioctl.c, libc/ioman.c, libc/link.c, libc/lseek.c, libc/mknod.c, libc/mount.c, libc/open.c, libc/read.c, libc/readlink.c, libc/rmdir.c, libc/stat.c, libc/symlink.c, libc/unlink.c, libc/unmount.c, libc/utime.c, libc/write.c: Modified to reflect above name change.
79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
/*
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* lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id$
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*/
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#include <stdio.h>
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#include "libio_.h"
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off_t lseek(
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int fd,
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off_t offset,
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int whence
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)
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{
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rtems_libio_t *iop;
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rtems_libio_check_fd( fd );
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iop = rtems_libio_iop( fd );
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rtems_libio_check_is_open(iop);
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/*
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* Now process the lseek().
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*/
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switch ( whence ) {
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case SEEK_SET:
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iop->offset = offset;
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break;
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case SEEK_CUR:
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iop->offset += offset;
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break;
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case SEEK_END:
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iop->offset = iop->size - offset;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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if ( !iop->handlers->lseek_h )
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set_errno_and_return_minus_one( ENOTSUP );
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return (*iop->handlers->lseek_h)( iop, offset, whence );
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}
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/*
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* _lseek_r
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*
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* This is the Newlib dependent reentrant version of lseek().
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*/
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#if defined(RTEMS_NEWLIB)
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#include <reent.h>
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off_t _lseek_r(
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struct _reent *ptr,
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int fd,
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off_t offset,
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int whence
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)
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{
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return lseek( fd, offset, whence );
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}
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#endif
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