diff options
Diffstat (limited to 'sys/boot/libsa/lseek.c')
| -rw-r--r-- | sys/boot/libsa/lseek.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/sys/boot/libsa/lseek.c b/sys/boot/libsa/lseek.c deleted file mode 100644 index df2591acd76d..000000000000 --- a/sys/boot/libsa/lseek.c +++ /dev/null @@ -1,141 +0,0 @@ -/* $NetBSD: lseek.c,v 1.4 1997/01/22 00:38:10 cgd Exp $ */ - -/*- - * Copyright (c) 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * The Mach Operating System project at Carnegie-Mellon University. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)lseek.c 8.1 (Berkeley) 6/11/93 - * - * - * Copyright (c) 1989, 1990, 1991 Carnegie Mellon University - * All Rights Reserved. - * - * Author: Alessandro Forin - * - * Permission to use, copy, modify and distribute this software and its - * documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR - * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to - * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 - * - * any improvements or extensions that they make and grant Carnegie the - * rights to redistribute these changes. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include "stand.h" - -off_t -lseek(int fd, off_t offset, int where) -{ - off_t bufpos, filepos, target; - struct open_file *f = &files[fd]; - - if ((unsigned)fd >= SOPEN_MAX || f->f_flags == 0) { - errno = EBADF; - return (-1); - } - - if (f->f_flags & F_RAW) { - /* - * On RAW devices, update internal offset. - */ - switch (where) { - case SEEK_SET: - f->f_offset = offset; - break; - case SEEK_CUR: - f->f_offset += offset; - break; - default: - errno = EOFFSET; - return (-1); - } - return (f->f_offset); - } - - /* - * If there is some unconsumed data in the readahead buffer and it - * contains the desired offset, simply adjust the buffer offset and - * length. We don't bother with SEEK_END here, since the code to - * handle it would fail in the same cases where the non-readahead - * code fails (namely, for streams which cannot seek backward and whose - * size isn't known in advance). - */ - if (f->f_ralen != 0 && where != SEEK_END) { - if ((filepos = (f->f_ops->fo_seek)(f, (off_t)0, SEEK_CUR)) == -1) - return (-1); - bufpos = filepos - f->f_ralen; - switch (where) { - case SEEK_SET: - target = offset; - break; - case SEEK_CUR: - target = bufpos + offset; - break; - default: - errno = EINVAL; - return (-1); - } - if (bufpos <= target && target < filepos) { - f->f_raoffset += target - bufpos; - f->f_ralen -= target - bufpos; - return (target); - } - } - - /* - * If this is a relative seek, we need to correct the offset for - * bytes that we have already read but the caller doesn't know - * about. - */ - if (where == SEEK_CUR) - offset -= f->f_ralen; - - /* - * Invalidate the readahead buffer. - */ - f->f_ralen = 0; - - return (f->f_ops->fo_seek)(f, offset, where); -} |