source: branches/2.2.2/mindi-busybox/libbb/mode_string.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 3.4 KB
Line 
1/* 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 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 *
9 */
10
11/* Aug 13, 2003
12 * Fix a bug reported by junkio@cox.net involving the mode_chars index.
13 */
14
15
16#include <assert.h>
17#include <sys/stat.h>
18
19#include "libbb.h"
20
21#if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
22 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
23 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
24 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
25#error permission bitflag value assumption(s) violated!
26#endif
27
28#if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
29 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
30 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
31 || ( S_IFIFO != 0010000 )
32#warning mode type bitflag value assumption(s) violated! falling back to larger version
33
34#if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
35#undef mode_t
36#define mode_t unsigned short
37#endif
38
39static const mode_t mode_flags[] = {
40    S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
41    S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
42    S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
43};
44
45/* The static const char arrays below are duplicated for the two cases
46 * because moving them ahead of the mode_flags declaration cause a text
47 * size increase with the gcc version I'm using. */
48
49/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
50 * and 'B' types don't appear to be available on linux.  So I removed them. */
51static const char type_chars[16] = "?pc?d?b?-?l?s???";
52/*                                  0123456789abcdef */
53static const char mode_chars[7] = "rwxSTst";
54
55const char *bb_mode_string(int mode)
56{
57    static char buf[12];
58    char *p = buf;
59
60    int i, j, k;
61
62    *p = type_chars[ (mode >> 12) & 0xf ];
63    i = 0;
64    do {
65        j = k = 0;
66        do {
67            *++p = '-';
68            if (mode & mode_flags[i+j]) {
69                *p = mode_chars[j];
70                k = j;
71            }
72        } while (++j < 3);
73        if (mode & mode_flags[i+j]) {
74            *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
75        }
76        i += 4;
77    } while (i < 12);
78
79    /* Note: We don't bother with nul termination because bss initialization
80     * should have taken care of that for us.  If the user scribbled in buf
81     * memory, they deserve whatever happens.  But we'll at least assert. */
82    assert(buf[10] == 0);
83
84    return buf;
85}
86
87#else
88
89/* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
90 * and 'B' types don't appear to be available on linux.  So I removed them. */
91static const char type_chars[16] = "?pc?d?b?-?l?s???";
92/*                                  0123456789abcdef */
93static const char mode_chars[7] = "rwxSTst";
94
95const char *bb_mode_string(int mode)
96{
97    static char buf[12];
98    char *p = buf;
99
100    int i, j, k, m;
101
102    *p = type_chars[ (mode >> 12) & 0xf ];
103    i = 0;
104    m = 0400;
105    do {
106        j = k = 0;
107        do {
108            *++p = '-';
109            if (mode & m) {
110                *p = mode_chars[j];
111                k = j;
112            }
113            m >>= 1;
114        } while (++j < 3);
115        ++i;
116        if (mode & (010000 >> i)) {
117            *p = mode_chars[3 + (k & 2) + (i == 3)];
118        }
119    } while (i < 3);
120
121    /* Note: We don't bother with nul termination because bss initialization
122     * should have taken care of that for us.  If the user scribbled in buf
123     * memory, they deserve whatever happens.  But we'll at least assert. */
124    assert(buf[10] == 0);
125
126    return buf;
127}
128
129#endif
Note: See TracBrowser for help on using the repository browser.