1 /* vi: set sw=4 ts=4: */
3 * bitops.c --- Bitmap frobbing code. See bitops.h for the inlined
6 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
9 * This file may be redistributed under the terms of the GNU Public
16 #include <sys/types.h>
22 #ifndef _EXT2_HAVE_ASM_BITOPS_
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.
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.
34 int ext2fs_set_bit(unsigned int nr,void * addr)
37 unsigned char *ADDR = (unsigned char *) addr;
40 mask = 1 << (nr & 0x07);
41 retval = mask & *ADDR;
46 int ext2fs_clear_bit(unsigned int nr, void * addr)
49 unsigned char *ADDR = (unsigned char *) addr;
52 mask = 1 << (nr & 0x07);
53 retval = mask & *ADDR;
58 int ext2fs_test_bit(unsigned int nr, const void * addr)
61 const unsigned char *ADDR = (const unsigned char *) addr;
64 mask = 1 << (nr & 0x07);
65 return (mask & *ADDR);
68 #endif /* !_EXT2_HAVE_ASM_BITOPS_ */
70 void ext2fs_warn_bitmap(errcode_t errcode, unsigned long arg,
71 const char *description)
75 bb_error_msg("#%lu for %s", arg, description);
77 bb_error_msg("#%lu", arg);
81 void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
82 int code, unsigned long arg)
85 if (bitmap->description)
86 bb_error_msg("#%lu for %s", arg, bitmap->description);
88 bb_error_msg("#%lu", arg);