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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [lseek.c] - Rev 596
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/* * lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: lseek.c,v 1.2 2001-09-27 12:01:15 chris Exp $ */ #include <stdio.h> #include "libio_.h" off_t lseek( int fd, off_t offset, int whence ) { rtems_libio_t *iop; rtems_libio_check_fd( fd ); iop = rtems_libio_iop( fd ); rtems_libio_check_is_open(iop); /* * Now process the lseek(). */ switch ( whence ) { case SEEK_SET: iop->offset = offset; break; case SEEK_CUR: iop->offset += offset; break; case SEEK_END: iop->offset = iop->size - offset; break; default: errno = EINVAL; return -1; } if ( !iop->handlers->lseek ) set_errno_and_return_minus_one( ENOTSUP ); return (*iop->handlers->lseek)( iop, offset, whence ); } /* * _lseek_r * * This is the Newlib dependent reentrant version of lseek(). */ #if defined(RTEMS_NEWLIB) #include <reent.h> off_t _lseek_r( struct _reent *ptr, int fd, off_t offset, int whence ) { return lseek( fd, offset, whence ); } #endif
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