aboutsummaryrefslogtreecommitdiff
path: root/e2fsprogs/ext2fs/bitops.c
blob: 44c08ad9f3cd667fc84475aa3c2faf347d0d43d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
/*
 * bitops.c --- Bitmap frobbing code.  See bitops.h for the inlined
 *	routines.
 *
 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include <stdio.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include "ext2_fs.h"
#include "ext2fs.h"

#ifndef _EXT2_HAVE_ASM_BITOPS_

/*
 * For the benefit of those who are trying to port Linux to another
 * architecture, here are some C-language equivalents.  You should
 * recode these in the native assmebly language, if at all possible.
 *
 * C language equivalents written by Theodore Ts'o, 9/26/92.
 * Modified by Pete A. Zaitcev 7/14/95 to be portable to big endian
 * systems, as well as non-32 bit systems.
 */

int ext2fs_set_bit(unsigned int nr,void * addr)
{
	int		mask, retval;
	unsigned char	*ADDR = (unsigned char *) addr;

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);
	retval = mask & *ADDR;
	*ADDR |= mask;
	return retval;
}

int ext2fs_clear_bit(unsigned int nr, void * addr)
{
	int		mask, retval;
	unsigned char	*ADDR = (unsigned char *) addr;

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);
	retval = mask & *ADDR;
	*ADDR &= ~mask;
	return retval;
}

int ext2fs_test_bit(unsigned int nr, const void * addr)
{
	int			mask;
	const unsigned char	*ADDR = (const unsigned char *) addr;

	ADDR += nr >> 3;
	mask = 1 << (nr & 0x07);
	return (mask & *ADDR);
}

#endif	/* !_EXT2_HAVE_ASM_BITOPS_ */

void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
			const char *description)
{
#ifndef OMIT_COM_ERR
	if (description)
		bb_error_msg("#%lu for %s", arg, description);
	else
		bb_error_msg("#%lu", arg);
#endif
}

void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
			    int code, unsigned long arg)
{
#ifndef OMIT_COM_ERR
	if (bitmap->description)
		bb_error_msg("#%lu for %s", arg, bitmap->description);
	else
		bb_error_msg("#%lu", arg);
#endif
}