LXR uboot/fs/reiserfs/mode

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * mode_string implementation for busybox
   4 *
   5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6 */
   7
   8/* Aug 13, 2003
   9 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
  10 */
  11
  12
  13#include <common.h>
  14#include <linux/stat.h>
  15
  16#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
  17 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
  18 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
  19 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
  20#error permission bitflag value assumption(s) violated!
  21#endif
  22
  23#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
  24 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
  25 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
  26 || ( S_IFIFO != 0010000 )
  27#warning mode type bitflag value assumption(s) violated! falling back to larger version
  28
  29#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
  30#undef mode_t
  31#define mode_t unsigned short
  32#endif
  33
  34static const mode_t mode_flags[] = {
  35        S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
  36        S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
  37        S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
  38};
  39
  40/* The static const char arrays below are duplicated for the two cases
  41 * because moving them ahead of the mode_flags declaration cause a text
  42 * size increase with the gcc version I'm using. */
  43
  44/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
  45 * and 'B' types don't appear to be available on linux.  So I removed them. */
  46static const char type_chars[16] = "?pc?d?b?-?l?s???";
  47/*                                  0123456789abcdef */
  48static const char mode_chars[7] = "rwxSTst";
  49
  50const char *bb_mode_string(int mode)
  51{
  52        static char buf[12];
  53        char *p = buf;
  54
  55        int i, j, k;
  56
  57        *p = type_chars[ (mode >> 12) & 0xf ];
  58        i = 0;
  59        do {
  60                j = k = 0;
  61                do {
  62                        *++p = '-';
  63                        if (mode & mode_flags[i+j]) {
  64                                *p = mode_chars[j];
  65                                k = j;
  66                        }
  67                } while (++j < 3);
  68                if (mode & mode_flags[i+j]) {
  69                        *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
  70                }
  71                i += 4;
  72        } while (i < 12);
  73
  74        /* Note: We don't bother with nul termination because bss initialization
  75         * should have taken care of that for us.  If the user scribbled in buf
  76         * memory, they deserve whatever happens.  But we'll at least assert. */
  77        if (buf[10] != 0) return NULL;
  78
  79        return buf;
  80}
  81
  82#else
  83
  84/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
  85 * and 'B' types don't appear to be available on linux.  So I removed them. */
  86static const char type_chars[16] = "?pc?d?b?-?l?s???";
  87/*                                  0123456789abcdef */
  88static const char mode_chars[7] = "rwxSTst";
  89
  90const char *bb_mode_string(int mode)
  91{
  92        static char buf[12];
  93        char *p = buf;
  94
  95        int i, j, k, m;
  96
  97        *p = type_chars[ (mode >> 12) & 0xf ];
  98        i = 0;
  99        m = 0400;
 100        do {
 101                j = k = 0;
 102                do {
 103                        *++p = '-';
 104                        if (mode & m) {
 105                                *p = mode_chars[j];
 106                                k = j;
 107                        }
 108                        m >>= 1;
 109                } while (++j < 3);
 110                ++i;
 111                if (mode & (010000 >> i)) {
 112                        *p = mode_chars[3 + (k & 2) + (i == 3)];
 113                }
 114        } while (i < 3);
 115
 116        /* Note: We don't bother with nul termination because bss initialization
 117         * should have taken care of that for us.  If the user scribbled in buf
 118         * memory, they deserve whatever happens.  But we'll at least assert. */
 119        if (buf[10] != 0) return NULL;
 120
 121        return buf;
 122}
 123
 124#endif
 125