blob: 3d08394d8ff841f5fcb584ca09e92aed8ac84e2a
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * bitops.c --- Bitmap frobbing code. See bitops.h for the inlined |
4 | * routines. |
5 | * |
6 | * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. |
7 | * |
8 | * %Begin-Header% |
9 | * This file may be redistributed under the terms of the GNU Public |
10 | * License. |
11 | * %End-Header% |
12 | */ |
13 | |
14 | #include <stdio.h> |
15 | #if HAVE_SYS_TYPES_H |
16 | #include <sys/types.h> |
17 | #endif |
18 | |
19 | #include "ext2_fs.h" |
20 | #include "ext2fs.h" |
21 | |
22 | #ifndef _EXT2_HAVE_ASM_BITOPS_ |
23 | |
24 | /* |
25 | * For the benefit of those who are trying to port Linux to another |
26 | * architecture, here are some C-language equivalents. You should |
27 | * recode these in the native assmebly language, if at all possible. |
28 | * |
29 | * C language equivalents written by Theodore Ts'o, 9/26/92. |
30 | * Modified by Pete A. Zaitcev 7/14/95 to be portable to big endian |
31 | * systems, as well as non-32 bit systems. |
32 | */ |
33 | |
34 | int ext2fs_set_bit(unsigned int nr,void * addr) |
35 | { |
36 | int mask, retval; |
37 | unsigned char *ADDR = (unsigned char *) addr; |
38 | |
39 | ADDR += nr >> 3; |
40 | mask = 1 << (nr & 0x07); |
41 | retval = mask & *ADDR; |
42 | *ADDR |= mask; |
43 | return retval; |
44 | } |
45 | |
46 | int ext2fs_clear_bit(unsigned int nr, void * addr) |
47 | { |
48 | int mask, retval; |
49 | unsigned char *ADDR = (unsigned char *) addr; |
50 | |
51 | ADDR += nr >> 3; |
52 | mask = 1 << (nr & 0x07); |
53 | retval = mask & *ADDR; |
54 | *ADDR &= ~mask; |
55 | return retval; |
56 | } |
57 | |
58 | int ext2fs_test_bit(unsigned int nr, const void * addr) |
59 | { |
60 | int mask; |
61 | const unsigned char *ADDR = (const unsigned char *) addr; |
62 | |
63 | ADDR += nr >> 3; |
64 | mask = 1 << (nr & 0x07); |
65 | return (mask & *ADDR); |
66 | } |
67 | |
68 | #endif /* !_EXT2_HAVE_ASM_BITOPS_ */ |
69 | |
70 | void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg, |
71 | const char *description) |
72 | { |
73 | #ifndef OMIT_COM_ERR |
74 | if (description) |
75 | bb_error_msg("#%lu for %s", arg, description); |
76 | else |
77 | bb_error_msg("#%lu", arg); |
78 | #endif |
79 | } |
80 | |
81 | void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap, |
82 | int code, unsigned long arg) |
83 | { |
84 | #ifndef OMIT_COM_ERR |
85 | if (bitmap->description) |
86 | bb_error_msg("#%lu for %s", arg, bitmap->description); |
87 | else |
88 | bb_error_msg("#%lu", arg); |
89 | #endif |
90 | } |
91 |