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git01.mediatek.com / filogic / uboot / 52ab7ce5eaabf8c5e93799bd6a09ca8d015fcc26 / . / fs / reiserfs / mode_string.c
blob: ec18dc16e9071480f5a05d1322f34dedb85fc6a1 [file] [log] [blame]
wdenk4d01d9e2004-03-25 14:59:05 +0000[diff] [blame]1/*
2 * mode_string implementation for busybox
3 *
4 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
5 *
Wolfgang Denkd79de1d2013-07-08 09:37:19 +0200[diff] [blame]6 * SPDX-License-Identifier: GPL-2.0+
wdenk4d01d9e2004-03-25 14:59:05 +0000[diff] [blame]7 */
8
9/* Aug 13, 2003
10 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
11 */
12
13
14#include <common.h>
wdenk4d01d9e2004-03-25 14:59:05 +0000[diff] [blame]15#include <linux/stat.h>
16
17#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
18 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
19 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
20 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
21#error permission bitflag value assumption(s) violated!
22#endif
23
24#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
25 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
26 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
27 || ( S_IFIFO != 0010000 )
28#warning mode type bitflag value assumption(s) violated! falling back to larger version
29
30#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
31#undef mode_t
32#define mode_t unsigned short
33#endif
34
35static const mode_t mode_flags[] = {
36 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
37 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
38 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
39};
40
41/* The static const char arrays below are duplicated for the two cases
42 * because moving them ahead of the mode_flags declaration cause a text
43 * size increase with the gcc version I'm using. */
44
45/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
46 * and 'B' types don't appear to be available on linux. So I removed them. */
47static const char type_chars[16] = "?pc?d?b?-?l?s???";
48/* 0123456789abcdef */
49static const char mode_chars[7] = "rwxSTst";
50
51const char *bb_mode_string(int mode)
52{
53 static char buf[12];
54 char *p = buf;
55
56 int i, j, k;
57
58 *p = type_chars[ (mode >> 12) & 0xf ];
59 i = 0;
60 do {
61 j = k = 0;
62 do {
63 *++p = '-';
64 if (mode & mode_flags[i+j]) {
65 *p = mode_chars[j];
66 k = j;
67 }
68 } while (++j < 3);
69 if (mode & mode_flags[i+j]) {
70 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
71 }
72 i += 4;
73 } while (i < 12);
74
75 /* Note: We don't bother with nul termination because bss initialization
76 * should have taken care of that for us. If the user scribbled in buf
77 * memory, they deserve whatever happens. But we'll at least assert. */
78 if (buf[10] != 0) return NULL;
79
80 return buf;
81}
82
83#else
84
85/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
86 * and 'B' types don't appear to be available on linux. So I removed them. */
wdenk4d01d9e2004-03-25 14:59:05 +0000[diff] [blame]87static const char type_chars[16] = "?pc?d?b?-?l?s???";
88/* 0123456789abcdef */
89static const char mode_chars[7] = "rwxSTst";
90
91const char *bb_mode_string(int mode)
92{
93 static char buf[12];
94 char *p = buf;
95
96 int i, j, k, m;
97
98 *p = type_chars[ (mode >> 12) & 0xf ];
99 i = 0;
100 m = 0400;
101 do {
102 j = k = 0;
103 do {
104 *++p = '-';
105 if (mode & m) {
106 *p = mode_chars[j];
107 k = j;
108 }
109 m >>= 1;
110 } while (++j < 3);
111 ++i;
112 if (mode & (010000 >> i)) {
113 *p = mode_chars[3 + (k & 2) + (i == 3)];
114 }
115 } while (i < 3);
116
117 /* Note: We don't bother with nul termination because bss initialization
118 * should have taken care of that for us. If the user scribbled in buf
119 * memory, they deserve whatever happens. But we'll at least assert. */
120 if (buf[10] != 0) return NULL;
121
122 return buf;
123}
124
125#endif