| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * mode_string implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | /* Aug 13, 2003
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| 11 | * Fix a bug reported by junkio@cox.net involving the mode_chars index.
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| 12 | */
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| 13 |
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| 14 |
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| 15 | #include <assert.h>
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| 16 | #include <sys/stat.h>
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| 17 |
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| 18 | #include "libbb.h"
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| 19 |
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| 20 | #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
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| 21 | || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
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| 22 | || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
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| 23 | || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
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| 24 | #error permission bitflag value assumption(s) violated!
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| 25 | #endif
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| 26 |
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| 27 | #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
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| 28 | || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
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| 29 | || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
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| 30 | || ( S_IFIFO != 0010000 )
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| 31 | #warning mode type bitflag value assumption(s) violated! falling back to larger version
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| 32 |
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| 33 | #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
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| 34 | #undef mode_t
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| 35 | #define mode_t unsigned short
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| 36 | #endif
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| 37 |
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| 38 | static const mode_t mode_flags[] = {
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| 39 | S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
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| 40 | S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
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| 41 | S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
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| 42 | };
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| 43 |
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| 44 | /* The static const char arrays below are duplicated for the two cases
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| 45 | * because moving them ahead of the mode_flags declaration cause a text
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| 46 | * size increase with the gcc version I'm using. */
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| 47 |
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| 48 | /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
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| 49 | * and 'B' types don't appear to be available on linux. So I removed them. */
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| 50 | static const char type_chars[16] ALIGN1 = "?pc?d?b?-?l?s???";
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| 51 | /***************************************** 0123456789abcdef */
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| 52 | static const char mode_chars[7] ALIGN1 = "rwxSTst";
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| 53 |
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| 54 | const char* FAST_FUNC bb_mode_string(mode_t mode)
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| 55 | {
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| 56 | static char buf[12];
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| 57 | char *p = buf;
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| 58 |
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| 59 | int i, j, k;
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| 60 |
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| 61 | *p = type_chars[ (mode >> 12) & 0xf ];
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| 62 | i = 0;
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| 63 | do {
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| 64 | j = k = 0;
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| 65 | do {
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| 66 | *++p = '-';
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| 67 | if (mode & mode_flags[i+j]) {
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| 68 | *p = mode_chars[j];
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| 69 | k = j;
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| 70 | }
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| 71 | } while (++j < 3);
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| 72 | if (mode & mode_flags[i+j]) {
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| 73 | *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
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| 74 | }
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| 75 | i += 4;
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| 76 | } while (i < 12);
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| 77 |
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| 78 | /* Note: We don't bother with nul termination because bss initialization
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| 79 | * should have taken care of that for us. If the user scribbled in buf
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| 80 | * memory, they deserve whatever happens. But we'll at least assert. */
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| 81 | assert(buf[10] == 0);
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| 82 |
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| 83 | return buf;
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| 84 | }
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| 85 |
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| 86 | #else
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| 87 |
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| 88 | /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
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| 89 | * and 'B' types don't appear to be available on linux. So I removed them. */
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| 90 | static const char type_chars[16] = "?pc?d?b?-?l?s???";
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| 91 | /********************************** 0123456789abcdef */
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| 92 | static const char mode_chars[7] = "rwxSTst";
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| 93 |
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| 94 | const char* FAST_FUNC bb_mode_string(mode_t mode)
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| 95 | {
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| 96 | static char buf[12];
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| 97 | char *p = buf;
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| 98 |
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| 99 | int i, j, k, m;
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| 100 |
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| 101 | *p = type_chars[ (mode >> 12) & 0xf ];
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| 102 | i = 0;
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| 103 | m = 0400;
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| 104 | do {
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| 105 | j = k = 0;
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| 106 | do {
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| 107 | *++p = '-';
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| 108 | if (mode & m) {
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| 109 | *p = mode_chars[j];
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| 110 | k = j;
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| 111 | }
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| 112 | m >>= 1;
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| 113 | } while (++j < 3);
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| 114 | ++i;
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| 115 | if (mode & (010000 >> i)) {
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| 116 | *p = mode_chars[3 + (k & 2) + (i == 3)];
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| 117 | }
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| 118 | } while (i < 3);
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| 119 |
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| 120 | /* Note: We don't bother with nul termination because bss initialization
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| 121 | * should have taken care of that for us. If the user scribbled in buf
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| 122 | * memory, they deserve whatever happens. But we'll at least assert. */
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| 123 | assert(buf[10] == 0);
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| 124 |
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| 125 | return buf;
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| 126 | }
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| 127 |
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| 128 | #endif
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