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518e2e1a WD |
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 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | /* Aug 13, 2003 | |
24 | * Fix a bug reported by junkio@cox.net involving the mode_chars index. | |
25 | */ | |
26 | ||
27 | ||
28 | #include <common.h> | |
29 | #if (CONFIG_COMMANDS & CFG_CMD_REISER) | |
30 | #include <linux/stat.h> | |
31 | ||
32 | #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \ | |
33 | || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \ | |
34 | || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \ | |
35 | || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 ) | |
36 | #error permission bitflag value assumption(s) violated! | |
37 | #endif | |
38 | ||
39 | #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \ | |
40 | || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \ | |
41 | || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \ | |
42 | || ( S_IFIFO != 0010000 ) | |
43 | #warning mode type bitflag value assumption(s) violated! falling back to larger version | |
44 | ||
45 | #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777 | |
46 | #undef mode_t | |
47 | #define mode_t unsigned short | |
48 | #endif | |
49 | ||
50 | static const mode_t mode_flags[] = { | |
51 | S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID, | |
52 | S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID, | |
53 | S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX | |
54 | }; | |
55 | ||
56 | /* The static const char arrays below are duplicated for the two cases | |
57 | * because moving them ahead of the mode_flags declaration cause a text | |
58 | * size increase with the gcc version I'm using. */ | |
59 | ||
60 | /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', | |
61 | * and 'B' types don't appear to be available on linux. So I removed them. */ | |
62 | static const char type_chars[16] = "?pc?d?b?-?l?s???"; | |
63 | /* 0123456789abcdef */ | |
64 | static const char mode_chars[7] = "rwxSTst"; | |
65 | ||
66 | const char *bb_mode_string(int mode) | |
67 | { | |
68 | static char buf[12]; | |
69 | char *p = buf; | |
70 | ||
71 | int i, j, k; | |
72 | ||
73 | *p = type_chars[ (mode >> 12) & 0xf ]; | |
74 | i = 0; | |
75 | do { | |
76 | j = k = 0; | |
77 | do { | |
78 | *++p = '-'; | |
79 | if (mode & mode_flags[i+j]) { | |
80 | *p = mode_chars[j]; | |
81 | k = j; | |
82 | } | |
83 | } while (++j < 3); | |
84 | if (mode & mode_flags[i+j]) { | |
85 | *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)]; | |
86 | } | |
87 | i += 4; | |
88 | } while (i < 12); | |
89 | ||
90 | /* Note: We don't bother with nul termination because bss initialization | |
91 | * should have taken care of that for us. If the user scribbled in buf | |
92 | * memory, they deserve whatever happens. But we'll at least assert. */ | |
93 | if (buf[10] != 0) return NULL; | |
94 | ||
95 | return buf; | |
96 | } | |
97 | ||
98 | #else | |
99 | ||
100 | /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', | |
101 | * and 'B' types don't appear to be available on linux. So I removed them. */ | |
518e2e1a WD |
102 | static const char type_chars[16] = "?pc?d?b?-?l?s???"; |
103 | /* 0123456789abcdef */ | |
104 | static const char mode_chars[7] = "rwxSTst"; | |
105 | ||
106 | const char *bb_mode_string(int mode) | |
107 | { | |
108 | static char buf[12]; | |
109 | char *p = buf; | |
110 | ||
111 | int i, j, k, m; | |
112 | ||
113 | *p = type_chars[ (mode >> 12) & 0xf ]; | |
114 | i = 0; | |
115 | m = 0400; | |
116 | do { | |
117 | j = k = 0; | |
118 | do { | |
119 | *++p = '-'; | |
120 | if (mode & m) { | |
121 | *p = mode_chars[j]; | |
122 | k = j; | |
123 | } | |
124 | m >>= 1; | |
125 | } while (++j < 3); | |
126 | ++i; | |
127 | if (mode & (010000 >> i)) { | |
128 | *p = mode_chars[3 + (k & 2) + (i == 3)]; | |
129 | } | |
130 | } while (i < 3); | |
131 | ||
132 | /* Note: We don't bother with nul termination because bss initialization | |
133 | * should have taken care of that for us. If the user scribbled in buf | |
134 | * memory, they deserve whatever happens. But we'll at least assert. */ | |
135 | if (buf[10] != 0) return NULL; | |
136 | ||
137 | return buf; | |
138 | } | |
139 | ||
140 | #endif | |
141 | ||
142 | #endif /* CFG_CMD_REISER */ |