LXR uboot/fs/reiserfs/mode

   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#include <linux/stat.h>
  29
  30#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
  31 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
  32 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
  33 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
  34#error permission bitflag value assumption(s) violated!
  35#endif
  36
  37#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
  38 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
  39 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
  40 || ( S_IFIFO != 0010000 )
  41#warning mode type bitflag value assumption(s) violated! falling back to larger version
  42
  43#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
  44#undef mode_t
  45#define mode_t unsigned short
  46#endif
  47
  48static const mode_t mode_flags[] = {
  49        S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
  50        S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
  51        S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
  52};
  53
  54/* The static const char arrays below are duplicated for the two cases
  55 * because moving them ahead of the mode_flags declaration cause a text
  56 * size increase with the gcc version I'm using. */
  57
  58/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
  59 * and 'B' types don't appear to be available on linux.  So I removed them. */
  60static const char type_chars[16] = "?pc?d?b?-?l?s???";
  61/*                                  0123456789abcdef */
  62static const char mode_chars[7] = "rwxSTst";
  63
  64const char *bb_mode_string(int mode)
  65{
  66        static char buf[12];
  67        char *p = buf;
  68
  69        int i, j, k;
  70
  71        *p = type_chars[ (mode >> 12) & 0xf ];
  72        i = 0;
  73        do {
  74                j = k = 0;
  75                do {
  76                        *++p = '-';
  77                        if (mode & mode_flags[i+j]) {
  78                                *p = mode_chars[j];
  79                                k = j;
  80                        }
  81                } while (++j < 3);
  82                if (mode & mode_flags[i+j]) {
  83                        *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
  84                }
  85                i += 4;
  86        } while (i < 12);
  87
  88        /* Note: We don't bother with nul termination because bss initialization
  89         * should have taken care of that for us.  If the user scribbled in buf
  90         * memory, they deserve whatever happens.  But we'll at least assert. */
  91        if (buf[10] != 0) return NULL;
  92
  93        return buf;
  94}
  95
  96#else
  97
  98/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
  99 * and 'B' types don't appear to be available on linux.  So I removed them. */
 100static const char type_chars[16] = "?pc?d?b?-?l?s???";
 101/*                                  0123456789abcdef */
 102static const char mode_chars[7] = "rwxSTst";
 103
 104const char *bb_mode_string(int mode)
 105{
 106        static char buf[12];
 107        char *p = buf;
 108
 109        int i, j, k, m;
 110
 111        *p = type_chars[ (mode >> 12) & 0xf ];
 112        i = 0;
 113        m = 0400;
 114        do {
 115                j = k = 0;
 116                do {
 117                        *++p = '-';
 118                        if (mode & m) {
 119                                *p = mode_chars[j];
 120                                k = j;
 121                        }
 122                        m >>= 1;
 123                } while (++j < 3);
 124                ++i;
 125                if (mode & (010000 >> i)) {
 126                        *p = mode_chars[3 + (k & 2) + (i == 3)];
 127                }
 128        } while (i < 3);
 129
 130        /* Note: We don't bother with nul termination because bss initialization
 131         * should have taken care of that for us.  If the user scribbled in buf
 132         * memory, they deserve whatever happens.  But we'll at least assert. */
 133        if (buf[10] != 0) return NULL;
 134
 135        return buf;
 136}
 137
 138#endif
 139