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