1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * mode_string implementation for busybox
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /* Aug 13, 2003
10*4882a593Smuzhiyun * Fix a bug reported by junkio@cox.net involving the mode_chars index.
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <common.h>
15*4882a593Smuzhiyun #include <linux/stat.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
18*4882a593Smuzhiyun || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
19*4882a593Smuzhiyun || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
20*4882a593Smuzhiyun || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
21*4882a593Smuzhiyun #error permission bitflag value assumption(s) violated!
22*4882a593Smuzhiyun #endif
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
25*4882a593Smuzhiyun || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
26*4882a593Smuzhiyun || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
27*4882a593Smuzhiyun || ( S_IFIFO != 0010000 )
28*4882a593Smuzhiyun #warning mode type bitflag value assumption(s) violated! falling back to larger version
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
31*4882a593Smuzhiyun #undef mode_t
32*4882a593Smuzhiyun #define mode_t unsigned short
33*4882a593Smuzhiyun #endif
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun static const mode_t mode_flags[] = {
36*4882a593Smuzhiyun S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
37*4882a593Smuzhiyun S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
38*4882a593Smuzhiyun S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
39*4882a593Smuzhiyun };
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /* The static const char arrays below are duplicated for the two cases
42*4882a593Smuzhiyun * because moving them ahead of the mode_flags declaration cause a text
43*4882a593Smuzhiyun * size increase with the gcc version I'm using. */
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
46*4882a593Smuzhiyun * and 'B' types don't appear to be available on linux. So I removed them. */
47*4882a593Smuzhiyun static const char type_chars[16] = "?pc?d?b?-?l?s???";
48*4882a593Smuzhiyun /* 0123456789abcdef */
49*4882a593Smuzhiyun static const char mode_chars[7] = "rwxSTst";
50*4882a593Smuzhiyun
bb_mode_string(int mode)51*4882a593Smuzhiyun const char *bb_mode_string(int mode)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun static char buf[12];
54*4882a593Smuzhiyun char *p = buf;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun int i, j, k;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun *p = type_chars[ (mode >> 12) & 0xf ];
59*4882a593Smuzhiyun i = 0;
60*4882a593Smuzhiyun do {
61*4882a593Smuzhiyun j = k = 0;
62*4882a593Smuzhiyun do {
63*4882a593Smuzhiyun *++p = '-';
64*4882a593Smuzhiyun if (mode & mode_flags[i+j]) {
65*4882a593Smuzhiyun *p = mode_chars[j];
66*4882a593Smuzhiyun k = j;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun } while (++j < 3);
69*4882a593Smuzhiyun if (mode & mode_flags[i+j]) {
70*4882a593Smuzhiyun *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun i += 4;
73*4882a593Smuzhiyun } while (i < 12);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun /* Note: We don't bother with nul termination because bss initialization
76*4882a593Smuzhiyun * should have taken care of that for us. If the user scribbled in buf
77*4882a593Smuzhiyun * memory, they deserve whatever happens. But we'll at least assert. */
78*4882a593Smuzhiyun if (buf[10] != 0) return NULL;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun return buf;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun #else
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
86*4882a593Smuzhiyun * and 'B' types don't appear to be available on linux. So I removed them. */
87*4882a593Smuzhiyun static const char type_chars[16] = "?pc?d?b?-?l?s???";
88*4882a593Smuzhiyun /* 0123456789abcdef */
89*4882a593Smuzhiyun static const char mode_chars[7] = "rwxSTst";
90*4882a593Smuzhiyun
bb_mode_string(int mode)91*4882a593Smuzhiyun const char *bb_mode_string(int mode)
92*4882a593Smuzhiyun {
93*4882a593Smuzhiyun static char buf[12];
94*4882a593Smuzhiyun char *p = buf;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun int i, j, k, m;
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun *p = type_chars[ (mode >> 12) & 0xf ];
99*4882a593Smuzhiyun i = 0;
100*4882a593Smuzhiyun m = 0400;
101*4882a593Smuzhiyun do {
102*4882a593Smuzhiyun j = k = 0;
103*4882a593Smuzhiyun do {
104*4882a593Smuzhiyun *++p = '-';
105*4882a593Smuzhiyun if (mode & m) {
106*4882a593Smuzhiyun *p = mode_chars[j];
107*4882a593Smuzhiyun k = j;
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun m >>= 1;
110*4882a593Smuzhiyun } while (++j < 3);
111*4882a593Smuzhiyun ++i;
112*4882a593Smuzhiyun if (mode & (010000 >> i)) {
113*4882a593Smuzhiyun *p = mode_chars[3 + (k & 2) + (i == 3)];
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun } while (i < 3);
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun /* Note: We don't bother with nul termination because bss initialization
118*4882a593Smuzhiyun * should have taken care of that for us. If the user scribbled in buf
119*4882a593Smuzhiyun * memory, they deserve whatever happens. But we'll at least assert. */
120*4882a593Smuzhiyun if (buf[10] != 0) return NULL;
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun return buf;
123*4882a593Smuzhiyun }
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun #endif
126