| 1 | /* $ZEL: sis1100_llseek_linux.c,v 1.2 2004/05/27 23:10:25 wuestner Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 2001-2004
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| 5 | * Peter Wuestner. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions, and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include "sis1100_sc.h"
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| 30 |
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| 31 | /* llseek is only needed for LINUX */
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| 32 |
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| 33 | /* SEEK_... normally defined in stdio.h, fcntl.h and unistd.h */
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| 34 | #define SEEK_SET 0
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| 35 | #define SEEK_CUR 1
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| 36 | #define SEEK_END 2
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| 37 |
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| 38 | loff_t sis1100_llseek(struct file* file, loff_t offset, int orig)
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| 39 | {
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| 40 | struct sis1100_softc* sc=SIS1100SC(file);
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| 41 | struct sis1100_fdata* fd=SIS1100FD(file);
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| 42 | loff_t old=file->f_pos;
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| 43 |
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| 44 | switch (orig) {
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| 45 | case SEEK_SET: file->f_pos=offset; break;
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| 46 | case SEEK_CUR: file->f_pos+=offset; break;
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| 47 | case SEEK_END:
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| 48 | if (fd->subdev==sis1100_subdev_ram) {
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| 49 | file->f_pos=sc->ram_size+offset;
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| 50 | } else
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| 51 | return -EINVAL;
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| 52 | break;
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| 53 | }
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| 54 | if ((file->f_pos<0) ||
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| 55 | (file->f_pos>
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| 56 | ((fd->subdev==sis1100_subdev_ram)?sc->ram_size:0xffffffffU))) {
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| 57 | file->f_pos=old;
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| 58 | return -EINVAL;
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| 59 | }
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| 60 | return file->f_pos;
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| 61 | }
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