blob: bc565fbddd2bdfea718100915a18d8abde273b5c [file] [log] [blame]
wdenk518e2e12004-03-25 14:59:05 +00001/* 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
50static 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. */
62static const char type_chars[16] = "?pc?d?b?-?l?s???";
63/* 0123456789abcdef */
64static const char mode_chars[7] = "rwxSTst";
65
66const 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. */
wdenk518e2e12004-03-25 14:59:05 +0000102static const char type_chars[16] = "?pc?d?b?-?l?s???";
103/* 0123456789abcdef */
104static const char mode_chars[7] = "rwxSTst";
105
106const 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 */