bitops.c revision 21c84b71e205b5ab13f14343da5645dcc985856d 
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#include <sys/types.h>
15
16#include <linux/ext2_fs.h>
17
18#include "ext2fs.h"
19
20#ifndef _EXT2_HAVE_ASM_BITOPS_
21
22/*
23 * For the benefit of those who are trying to port Linux to another
24 * architecture, here are some C-language equivalents.  You should
25 * recode these in the native assmebly language, if at all possible.
26 *
27 * C language equivalents written by Theodore Ts'o, 9/26/92.
28 * Modified by Pete A. Zaitcev 7/14/95 to be portable to big endian
29 * systems, as well as non-32 bit systems.
30 */
31
32int ext2fs_set_bit(int nr,void * addr)
33{
34	int		mask, retval;
35	unsigned char	*ADDR = (unsigned char *) addr;
36
37	ADDR += nr >> 3;
38	mask = 1 << (nr & 0x07);
39	retval = (mask & *ADDR) != 0;
40	*ADDR |= mask;
41	return retval;
42}
43
44int ext2fs_clear_bit(int nr, void * addr)
45{
46	int		mask, retval;
47	unsigned char	*ADDR = (unsigned char *) addr;
48
49	ADDR += nr >> 3;
50	mask = 1 << (nr & 0x07);
51	retval = (mask & *ADDR) != 0;
52	*ADDR &= ~mask;
53	return retval;
54}
55
56int ext2fs_test_bit(int nr, const void * addr)
57{
58	int			mask;
59	const unsigned char	*ADDR = (const unsigned char *) addr;
60
61	ADDR += nr >> 3;
62	mask = 1 << (nr & 0x07);
63	return ((mask & *ADDR) != 0);
64}
65
66#endif	/* !_EXT2_HAVE_ASM_BITOPS_ */
67
68void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
69			const char *description)
70{
71	if (description)
72		com_err(0, errcode, "#%u for %s", arg, description);
73	else
74		com_err(0, errcode, "#%u", arg);
75}
76
77void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
78			    int code, unsigned long arg)
79{
80	if (bitmap->description)
81		com_err(0, bitmap->base_error_code+code,
82			"#%u for %s", arg, bitmap->description);
83	else
84		com_err(0, bitmap->base_error_code + code, "#%u", arg);
85}
86
87