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518e2e1a WD |
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> | |
518e2e1a WD |
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 | ||
48 | static 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. */ | |
60 | static const char type_chars[16] = "?pc?d?b?-?l?s???"; | |
61 | /* 0123456789abcdef */ | |
62 | static const char mode_chars[7] = "rwxSTst"; | |
63 | ||
64 | const 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. */ | |
518e2e1a WD |
100 | static const char type_chars[16] = "?pc?d?b?-?l?s???"; |
101 | /* 0123456789abcdef */ | |
102 | static const char mode_chars[7] = "rwxSTst"; | |
103 | ||
104 | const 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 |