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    Contents of /trunk/mkinitrd-magellan/busybox/libbb/mode_string.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 3430 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    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 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 /* Aug 13, 2003
    11 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
    12 */
    13
    14
    15 #include <assert.h>
    16 #include <sys/stat.h>
    17
    18 #include "libbb.h"
    19
    20 #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
    21 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
    22 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
    23 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
    24 #error permission bitflag value assumption(s) violated!
    25 #endif
    26
    27 #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
    28 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
    29 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
    30 || ( S_IFIFO != 0010000 )
    31 #warning mode type bitflag value assumption(s) violated! falling back to larger version
    32
    33 #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
    34 #undef mode_t
    35 #define mode_t unsigned short
    36 #endif
    37
    38 static const mode_t mode_flags[] = {
    39 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
    40 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
    41 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
    42 };
    43
    44 /* The static const char arrays below are duplicated for the two cases
    45 * because moving them ahead of the mode_flags declaration cause a text
    46 * size increase with the gcc version I'm using. */
    47
    48 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
    49 * and 'B' types don't appear to be available on linux. So I removed them. */
    50 static const char type_chars[16] = "?pc?d?b?-?l?s???";
    51 /* 0123456789abcdef */
    52 static const char mode_chars[7] = "rwxSTst";
    53
    54 const char *bb_mode_string(int mode)
    55 {
    56 static char buf[12];
    57 char *p = buf;
    58
    59 int i, j, k;
    60
    61 *p = type_chars[ (mode >> 12) & 0xf ];
    62 i = 0;
    63 do {
    64 j = k = 0;
    65 do {
    66 *++p = '-';
    67 if (mode & mode_flags[i+j]) {
    68 *p = mode_chars[j];
    69 k = j;
    70 }
    71 } while (++j < 3);
    72 if (mode & mode_flags[i+j]) {
    73 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
    74 }
    75 i += 4;
    76 } while (i < 12);
    77
    78 /* Note: We don't bother with nul termination because bss initialization
    79 * should have taken care of that for us. If the user scribbled in buf
    80 * memory, they deserve whatever happens. But we'll at least assert. */
    81 assert(buf[10] == 0);
    82
    83 return buf;
    84 }
    85
    86 #else
    87
    88 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
    89 * and 'B' types don't appear to be available on linux. So I removed them. */
    90 static const char type_chars[16] = "?pc?d?b?-?l?s???";
    91 /* 0123456789abcdef */
    92 static const char mode_chars[7] = "rwxSTst";
    93
    94 const char *bb_mode_string(int mode)
    95 {
    96 static char buf[12];
    97 char *p = buf;
    98
    99 int i, j, k, m;
    100
    101 *p = type_chars[ (mode >> 12) & 0xf ];
    102 i = 0;
    103 m = 0400;
    104 do {
    105 j = k = 0;
    106 do {
    107 *++p = '-';
    108 if (mode & m) {
    109 *p = mode_chars[j];
    110 k = j;
    111 }
    112 m >>= 1;
    113 } while (++j < 3);
    114 ++i;
    115 if (mode & (010000 >> i)) {
    116 *p = mode_chars[3 + (k & 2) + (i == 3)];
    117 }
    118 } while (i < 3);
    119
    120 /* Note: We don't bother with nul termination because bss initialization
    121 * should have taken care of that for us. If the user scribbled in buf
    122 * memory, they deserve whatever happens. But we'll at least assert. */
    123 assert(buf[10] == 0);
    124
    125 return buf;
    126 }
    127
    128 #endif