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] ALIGN1 = "?pc?d?b?-?l?s???";
|
---|
51 | /* 0123456789abcdef */
|
---|
52 | static const char mode_chars[7] ALIGN1 = "rwxSTst";
|
---|
53 |
|
---|
54 | const char *bb_mode_string(mode_t 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(mode_t 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
|
---|