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
ext2fs_set_bit(unsigned int nr,void * addr)33 int 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
ext2fs_clear_bit(unsigned int nr,void * addr)45 int 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
ext2fs_test_bit(unsigned int nr,const void * addr)57 int 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
ext2fs_warn_bitmap(errcode_t errcode,unsigned long arg,const char * description)69 void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
70 const char *description)
71 {
72 #ifndef OMIT_COM_ERR
73 if (description)
74 com_err(0, errcode, "#%lu for %s", arg, description);
75 else
76 com_err(0, errcode, "#%lu", arg);
77 #endif
78 }
79
ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,int code,unsigned long arg)80 void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
81 int code, unsigned long arg)
82 {
83 #ifndef OMIT_COM_ERR
84 if (bitmap->description)
85 com_err(0, bitmap->base_error_code+code,
86 "#%lu for %s", arg, bitmap->description);
87 else
88 com_err(0, bitmap->base_error_code + code, "#%lu", arg);
89 #endif
90 }
91
92