fs/reiserfs/mode_string.c

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