fs/reiserfs/mode_string.c

   1 /*
   2  * mode_string implementation for busybox
   3  *
   4  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  */
  21
  22 /* Aug 13, 2003
  23  * Fix a bug reported by junkio@cox.net involving the mode_chars index.
  24  */
  25
  26
  27 #include <common.h>
  28 #if defined(CONFIG_CMD_REISER)
  29 #include <linux/stat.h>
  30
  31 #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
  32  || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
  33  || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
  34  || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
  35 #error permission bitflag value assumption(s) violated!
  36 #endif
  37
  38 #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
  39  || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
  40  || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
  41  || ( S_IFIFO != 0010000 )
  42 #warning mode type bitflag value assumption(s) violated! falling back to larger version
  43
  44 #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
  45 #undef mode_t
  46 #define mode_t unsigned short
  47 #endif
  48
  49 static const mode_t mode_flags[] = {
  50         S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
  51         S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
  52         S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
  53 };
  54
  55 /* The static const char arrays below are duplicated for the two cases
  56  * because moving them ahead of the mode_flags declaration cause a text
  57  * size increase with the gcc version I'm using. */
  58
  59 /* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
  60  * and 'B' types don't appear to be available on linux.  So I removed them. */
  61 static const char type_chars[16] = "?pc?d?b?-?l?s???";
  62 /*                                  0123456789abcdef */
  63 static const char mode_chars[7] = "rwxSTst";
  64
  65 const char *bb_mode_string(int mode)
  66 {
  67         static char buf[12];
  68         char *p = buf;
  69
  70         int i, j, k;
  71
  72         *p = type_chars[ (mode >> 12) & 0xf ];
  73         i = 0;
  74         do {
  75                 j = k = 0;
  76                 do {
  77                         *++p = '-';
  78                         if (mode & mode_flags[i+j]) {
  79                                 *p = mode_chars[j];
  80                                 k = j;
  81                         }
  82                 } while (++j < 3);
  83                 if (mode & mode_flags[i+j]) {
  84                         *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
  85                 }
  86                 i += 4;
  87         } while (i < 12);
  88
  89         /* Note: We don't bother with nul termination because bss initialization
  90          * should have taken care of that for us.  If the user scribbled in buf
  91          * memory, they deserve whatever happens.  But we'll at least assert. */
  92         if (buf[10] != 0) return NULL;
  93
  94         return buf;
  95 }
  96
  97 #else
  98
  99 /* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
 100  * and 'B' types don't appear to be available on linux.  So I removed them. */
 101 static const char type_chars[16] = "?pc?d?b?-?l?s???";
 102 /*                                  0123456789abcdef */
 103 static const char mode_chars[7] = "rwxSTst";
 104
 105 const char *bb_mode_string(int mode)
 106 {
 107         static char buf[12];
 108         char *p = buf;
 109
 110         int i, j, k, m;
 111
 112         *p = type_chars[ (mode >> 12) & 0xf ];
 113         i = 0;
 114         m = 0400;
 115         do {
 116                 j = k = 0;
 117                 do {
 118                         *++p = '-';
 119                         if (mode & m) {
 120                                 *p = mode_chars[j];
 121                                 k = j;
 122                         }
 123                         m >>= 1;
 124                 } while (++j < 3);
 125                 ++i;
 126                 if (mode & (010000 >> i)) {
 127                         *p = mode_chars[3 + (k & 2) + (i == 3)];
 128                 }
 129         } while (i < 3);
 130
 131         /* Note: We don't bother with nul termination because bss initialization
 132          * should have taken care of that for us.  If the user scribbled in buf
 133          * memory, they deserve whatever happens.  But we'll at least assert. */
 134         if (buf[10] != 0) return NULL;
 135
 136         return buf;
 137 }
 138
 139 #endif
 140
 141 #endif