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 34int 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 46int 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 58int 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 70void 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 81void 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