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Eric Andersenaad1a882001-03-16 22:47:14 +00001/* vi: set sw=4 ts=4: */
2/*
Manuel Novoa III cad53642003-03-19 09:13:01 +00003 * mode_string implementation for busybox
Eric Andersenaad1a882001-03-16 22:47:14 +00004 *
Manuel Novoa III cad53642003-03-19 09:13:01 +00005 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
Eric Andersenaad1a882001-03-16 22:47:14 +00006 *
Bernhard Reutner-Fischer421d9e52006-04-03 16:39:31 +00007 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersenaad1a882001-03-16 22:47:14 +00008 */
9
Manuel Novoa III 062913f2003-08-14 02:28:49 +000010/* Aug 13, 2003
11 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
12 */
13
14
Manuel Novoa III cad53642003-03-19 09:13:01 +000015#include <assert.h>
16#include <sys/stat.h>
Eric Andersenaad1a882001-03-16 22:47:14 +000017
Bernhard Reutner-Fischer421d9e52006-04-03 16:39:31 +000018#include "libbb.h"
19
Manuel Novoa III cad53642003-03-19 09:13:01 +000020#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
21 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
22 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
23 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
24#error permission bitflag value assumption(s) violated!
25#endif
Eric Andersenaad1a882001-03-16 22:47:14 +000026
Manuel Novoa III cad53642003-03-19 09:13:01 +000027#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
28 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
29 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
30 || ( S_IFIFO != 0010000 )
31#warning mode type bitflag value assumption(s) violated! falling back to larger version
Eric Andersenaad1a882001-03-16 22:47:14 +000032
Manuel Novoa III cad53642003-03-19 09:13:01 +000033#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
34#undef mode_t
35#define mode_t unsigned short
36#endif
Eric Andersenaad1a882001-03-16 22:47:14 +000037
Manuel Novoa III cad53642003-03-19 09:13:01 +000038static const mode_t mode_flags[] = {
39 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
40 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
41 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
Eric Andersenaad1a882001-03-16 22:47:14 +000042};
43
Manuel Novoa III cad53642003-03-19 09:13:01 +000044/* The static const char arrays below are duplicated for the two cases
45 * because moving them ahead of the mode_flags declaration cause a text
46 * size increase with the gcc version I'm using. */
Eric Andersenaad1a882001-03-16 22:47:14 +000047
Manuel Novoa III cad53642003-03-19 09:13:01 +000048/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
49 * and 'B' types don't appear to be available on linux. So I removed them. */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000050static const char type_chars[16] ALIGN1 = "?pc?d?b?-?l?s???";
Manuel Novoa III cad53642003-03-19 09:13:01 +000051/* 0123456789abcdef */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000052static const char mode_chars[7] ALIGN1 = "rwxSTst";
Eric Andersenaad1a882001-03-16 22:47:14 +000053
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000054const char* FAST_FUNC bb_mode_string(mode_t mode)
Eric Andersenaad1a882001-03-16 22:47:14 +000055{
56 static char buf[12];
Manuel Novoa III cad53642003-03-19 09:13:01 +000057 char *p = buf;
Eric Andersenaad1a882001-03-16 22:47:14 +000058
Manuel Novoa III cad53642003-03-19 09:13:01 +000059 int i, j, k;
Eric Andersenaad1a882001-03-16 22:47:14 +000060
Manuel Novoa III cad53642003-03-19 09:13:01 +000061 *p = type_chars[ (mode >> 12) & 0xf ];
62 i = 0;
63 do {
64 j = k = 0;
65 do {
66 *++p = '-';
67 if (mode & mode_flags[i+j]) {
68 *p = mode_chars[j];
69 k = j;
70 }
71 } while (++j < 3);
72 if (mode & mode_flags[i+j]) {
73 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
74 }
75 i += 4;
76 } while (i < 12);
77
78 /* Note: We don't bother with nul termination because bss initialization
79 * should have taken care of that for us. If the user scribbled in buf
80 * memory, they deserve whatever happens. But we'll at least assert. */
81 assert(buf[10] == 0);
82
Eric Andersenaad1a882001-03-16 22:47:14 +000083 return buf;
84}
85
Manuel Novoa III cad53642003-03-19 09:13:01 +000086#else
87
88/* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C',
89 * and 'B' types don't appear to be available on linux. So I removed them. */
90static const char type_chars[16] = "?pc?d?b?-?l?s???";
91/* 0123456789abcdef */
92static const char mode_chars[7] = "rwxSTst";
93
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +000094const char* FAST_FUNC bb_mode_string(mode_t mode)
Manuel Novoa III cad53642003-03-19 09:13:01 +000095{
96 static char buf[12];
97 char *p = buf;
98
99 int i, j, k, m;
100
101 *p = type_chars[ (mode >> 12) & 0xf ];
102 i = 0;
103 m = 0400;
104 do {
105 j = k = 0;
106 do {
107 *++p = '-';
108 if (mode & m) {
109 *p = mode_chars[j];
110 k = j;
111 }
112 m >>= 1;
113 } while (++j < 3);
114 ++i;
115 if (mode & (010000 >> i)) {
Manuel Novoa III 062913f2003-08-14 02:28:49 +0000116 *p = mode_chars[3 + (k & 2) + (i == 3)];
Manuel Novoa III cad53642003-03-19 09:13:01 +0000117 }
118 } while (i < 3);
119
120 /* Note: We don't bother with nul termination because bss initialization
121 * should have taken care of that for us. If the user scribbled in buf
122 * memory, they deserve whatever happens. But we'll at least assert. */
123 assert(buf[10] == 0);
124
125 return buf;
126}
127
128#endif