LXR busybox/e2fsprogs/old_e2fsprogs/ext2fs/bitops.c

   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