summaryrefslogtreecommitdiffstats
path: root/fs/reiserfs/mode_string.c
blob: bc565fbddd2bdfea718100915a18d8abde273b5c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/* vi: set sw=4 ts=4: */
/*
 * mode_string implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

/* Aug 13, 2003
 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
 */


#include <common.h>
#if (CONFIG_COMMANDS & CFG_CMD_REISER)
#include <linux/stat.h>

#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
#error permission bitflag value assumption(s) violated!
#endif

#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
 || ( S_IFIFO != 0010000 )
#warning mode type bitflag value assumption(s) violated! falling back to larger version

#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
#undef mode_t
#define mode_t unsigned short
#endif

static const mode_t mode_flags[] = {
	S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
	S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
	S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
};

/* The static const char arrays below are duplicated for the two cases
 * because moving them ahead of the mode_flags declaration cause a text
 * size increase with the gcc version I'm using. */

/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
 * and 'B' types don't appear to be available on linux.  So I removed them. */
static const char type_chars[16] = "?pc?d?b?-?l?s???";
/*                                  0123456789abcdef */
static const char mode_chars[7] = "rwxSTst";

const char *bb_mode_string(int mode)
{
	static char buf[12];
	char *p = buf;

	int i, j, k;

	*p = type_chars[ (mode >> 12) & 0xf ];
	i = 0;
	do {
		j = k = 0;
		do {
			*++p = '-';
			if (mode & mode_flags[i+j]) {
				*p = mode_chars[j];
				k = j;
			}
		} while (++j < 3);
		if (mode & mode_flags[i+j]) {
			*p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
		}
		i += 4;
	} while (i < 12);

	/* Note: We don't bother with nul termination because bss initialization
	 * should have taken care of that for us.  If the user scribbled in buf
	 * memory, they deserve whatever happens.  But we'll at least assert. */
	if (buf[10] != 0) return NULL;

	return buf;
}

#else

/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
 * and 'B' types don't appear to be available on linux.  So I removed them. */
static const char type_chars[16] = "?pc?d?b?-?l?s???";
/*                                  0123456789abcdef */
static const char mode_chars[7] = "rwxSTst";

const char *bb_mode_string(int mode)
{
	static char buf[12];
	char *p = buf;

	int i, j, k, m;

	*p = type_chars[ (mode >> 12) & 0xf ];
	i = 0;
	m = 0400;
	do {
		j = k = 0;
		do {
			*++p = '-';
			if (mode & m) {
				*p = mode_chars[j];
				k = j;
			}
			m >>= 1;
		} while (++j < 3);
		++i;
		if (mode & (010000 >> i)) {
			*p = mode_chars[3 + (k & 2) + (i == 3)];
		}
	} while (i < 3);

	/* Note: We don't bother with nul termination because bss initialization
	 * should have taken care of that for us.  If the user scribbled in buf
	 * memory, they deserve whatever happens.  But we'll at least assert. */
	if (buf[10] != 0) return NULL;

	return buf;
}

#endif

#endif /* CFG_CMD_REISER */
OpenPOWER on IntegriCloud