source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/bitops.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.9 KB
Line 
1/*
2 * bitops.c --- Bitmap frobbing code.  See bitops.h for the inlined
3 *  routines.
4 *
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 */
12
13#include <stdio.h>
14#if HAVE_SYS_TYPES_H
15#include <sys/types.h>
16#endif
17
18#include "ext2_fs.h"
19#include "ext2fs.h"
20
21#ifndef _EXT2_HAVE_ASM_BITOPS_
22
23/*
24 * For the benefit of those who are trying to port Linux to another
25 * architecture, here are some C-language equivalents.  You should
26 * recode these in the native assmebly language, if at all possible.
27 *
28 * C language equivalents written by Theodore Ts'o, 9/26/92.
29 * Modified by Pete A. Zaitcev 7/14/95 to be portable to big endian
30 * systems, as well as non-32 bit systems.
31 */
32
33int ext2fs_set_bit(unsigned int nr,void * addr)
34{
35    int     mask, retval;
36    unsigned char   *ADDR = (unsigned char *) addr;
37
38    ADDR += nr >> 3;
39    mask = 1 << (nr & 0x07);
40    retval = mask & *ADDR;
41    *ADDR |= mask;
42    return retval;
43}
44
45int ext2fs_clear_bit(unsigned int nr, void * addr)
46{
47    int     mask, retval;
48    unsigned char   *ADDR = (unsigned char *) addr;
49
50    ADDR += nr >> 3;
51    mask = 1 << (nr & 0x07);
52    retval = mask & *ADDR;
53    *ADDR &= ~mask;
54    return retval;
55}
56
57int ext2fs_test_bit(unsigned int nr, const void * addr)
58{
59    int         mask;
60    const unsigned char *ADDR = (const unsigned char *) addr;
61
62    ADDR += nr >> 3;
63    mask = 1 << (nr & 0x07);
64    return (mask & *ADDR);
65}
66
67#endif  /* !_EXT2_HAVE_ASM_BITOPS_ */
68
69void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
70            const char *description)
71{
72#ifndef OMIT_COM_ERR
73    if (description)
74        bb_error_msg("#%lu for %s", arg, description);
75    else
76        bb_error_msg("#%lu", arg);
77#endif
78}
79
80void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
81                int code, unsigned long arg)
82{
83#ifndef OMIT_COM_ERR
84    if (bitmap->description)
85        bb_error_msg("#%lu for %s", arg, bitmap->description);
86    else
87        bb_error_msg("#%lu", arg);
88#endif
89}
90
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