release/src/router/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
  34 int 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
  46 int 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
  58 int 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
  70 void ext2fs_warn_bitmap(errcode_t errcode EXT2FS_ATTR((unused)),
  71                         unsigned long arg,
  72                         const char *description)
  73 {
  74 #ifndef OMIT_COM_ERR
  75         if (description)
  76                 bb_error_msg("#%lu for %s", arg, description);
  77         else
  78                 bb_error_msg("#%lu", arg);
  79 #endif
  80 }
  81
  82 void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
  83                             int code EXT2FS_ATTR((unused)), unsigned long arg)
  84 {
  85 #ifndef OMIT_COM_ERR
  86         if (bitmap->description)
  87                 bb_error_msg("#%lu for %s", arg, bitmap->description);
  88         else
  89                 bb_error_msg("#%lu", arg);
  90 #endif
  91 }