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wdenk518e2e12004-03-25 14:59:05 +00001/*
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>
wdenk518e2e12004-03-25 14:59:05 +000028#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
48static 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. */
60static const char type_chars[16] = "?pc?d?b?-?l?s???";
61/* 0123456789abcdef */
62static const char mode_chars[7] = "rwxSTst";
63
64const 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. */
wdenk518e2e12004-03-25 14:59:05 +0000100static const char type_chars[16] = "?pc?d?b?-?l?s???";
101/* 0123456789abcdef */
102static const char mode_chars[7] = "rwxSTst";
103
104const 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