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Annotation of sys/lib/libsa/lseek.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: lseek.c,v 1.7 2003/08/11 06:23:09 deraadt Exp $       */
                      2: /*     $NetBSD: lseek.c,v 1.3 1996/06/21 20:09:03 pk Exp $     */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * The Mach Operating System project at Carnegie-Mellon University.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  *     @(#)lseek.c     8.1 (Berkeley) 6/11/93
                     36:  *
                     37:  *
                     38:  * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University
                     39:  * All Rights Reserved.
                     40:  *
                     41:  * Author: Alessandro Forin
                     42:  *
                     43:  * Permission to use, copy, modify and distribute this software and its
                     44:  * documentation is hereby granted, provided that both the copyright
                     45:  * notice and this permission notice appear in all copies of the
                     46:  * software, derivative works or modified versions, and any portions
                     47:  * thereof, and that both notices appear in supporting documentation.
                     48:  *
                     49:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     50:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     51:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     52:  *
                     53:  * Carnegie Mellon requests users of this software to return to
                     54:  *
                     55:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     56:  *  School of Computer Science
                     57:  *  Carnegie Mellon University
                     58:  *  Pittsburgh PA 15213-3890
                     59:  *
                     60:  * any improvements or extensions that they make and grant Carnegie the
                     61:  * rights to redistribute these changes.
                     62:  */
                     63:
                     64: #include "stand.h"
                     65:
                     66: off_t
                     67: #ifndef __INTERNAL_LIBSA_CREAD
                     68: lseek(int fd, off_t offset, int where)
                     69: #else
                     70: olseek(int fd, off_t offset, int where)
                     71: #endif
                     72: {
                     73:        struct open_file *f = &files[fd];
                     74:
                     75:        if ((unsigned)fd >= SOPEN_MAX || f->f_flags == 0) {
                     76:                errno = EBADF;
                     77:                return (-1);
                     78:        }
                     79:
                     80:        if (f->f_flags & F_RAW) {
                     81:                /*
                     82:                 * On RAW devices, update internal offset.
                     83:                 */
                     84:                switch (where) {
                     85:                case SEEK_SET:
                     86:                        f->f_offset = offset;
                     87:                        break;
                     88:                case SEEK_CUR:
                     89:                        f->f_offset += offset;
                     90:                        break;
                     91:                case SEEK_END:
                     92:                default:
                     93:                        errno = EOFFSET;
                     94:                        return (-1);
                     95:                }
                     96:                return (f->f_offset);
                     97:        }
                     98:
                     99:        return (f->f_ops->seek)(f, offset, where);
                    100: }