Subversion Repositories HelenOS

Rev

Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
4419 trochtova 1
/*
2
 * Copyright (c) 2008 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/** @addtogroup fs
30
 * @{
31
 */
32
 
33
/**
34
 * @file    fat_dentry.c
35
 * @brief   Functions that work with FAT directory entries.
36
 */
37
 
38
#include "fat_dentry.h"
39
#include <ctype.h>
40
#include <string.h>
41
 
42
static bool is_d_char(const char ch)
43
{
44
    if (isalnum(ch) || ch == '_')
45
        return true;
46
    else
47
        return false;
48
}
49
 
50
/** Compare path component with the name read from the dentry.
51
 *
52
 * This function compares the path component with the name read from the dentry.
53
 * The comparison is case insensitive and tolerates a mismatch on the trailing
54
 * dot character at the end of the name (i.e. when there is a dot, but no
55
 * extension).
56
 *
57
 * @param name      Node name read from the dentry.
58
 * @param component Path component.
59
 *
60
 * @return      Zero on match, non-zero otherwise.
61
 */
62
int fat_dentry_namecmp(char *name, const char *component)
63
{
64
    int rc;
65
    size_t size;
66
 
67
    if (!(rc = stricmp(name, component)))
68
        return rc;
69
    if (!str_chr(name, '.')) {
70
        /*
71
         * There is no '.' in the name, so we know that there is enough
72
         * space for appending an extra '.' to name.
73
         */
74
        size = str_size(name);
75
        name[size] = '.';
76
        name[size + 1] = '\0';
77
        rc = stricmp(name, component);
78
    }
79
    return rc;
80
}
81
 
82
bool fat_dentry_name_verify(const char *name)
83
{
84
    unsigned i, dot;
85
    bool dot_found = false;
86
 
87
 
88
    for (i = 0; name[i]; i++) {
89
        if (name[i] == '.') {
90
            if (dot_found) {
91
                return false;
92
            } else {
93
                dot_found = true;
94
                dot = i;
95
            }
96
        } else {
97
            if (!is_d_char(name[i]))
98
                return false;
99
        }
100
    }
101
 
102
    if (dot_found) {
103
        if (dot > FAT_NAME_LEN)
104
            return false;
105
        if (i - dot > FAT_EXT_LEN + 1)
106
            return false;
107
    } else {
108
        if (i > FAT_NAME_LEN)
109
            return false;
110
    }
111
 
112
    return true;
113
}
114
 
115
void fat_dentry_name_get(const fat_dentry_t *d, char *buf)
116
{
117
    int i;
118
 
119
    for (i = 0; i < FAT_NAME_LEN; i++) {
120
        if (d->name[i] == FAT_PAD)
121
            break;
122
        if (d->name[i] == FAT_DENTRY_E5_ESC)
123
            *buf++ = 0xe5;
124
        else
125
            *buf++ = d->name[i];
126
    }
127
    if (d->ext[0] != FAT_PAD)
128
        *buf++ = '.';
129
    for (i = 0; i < FAT_EXT_LEN; i++) {
130
        if (d->ext[i] == FAT_PAD) {
131
            *buf = '\0';
132
            return;
133
        }
134
        if (d->ext[i] == FAT_DENTRY_E5_ESC)
135
            *buf++ = 0xe5;
136
        else
137
            *buf++ = d->ext[i];
138
    }
139
    *buf = '\0';
140
}
141
 
142
void fat_dentry_name_set(fat_dentry_t *d, const char *name)
143
{
144
    int i;
145
    const char fake_ext[] = "   ";
146
 
147
 
148
    for (i = 0; i < FAT_NAME_LEN; i++) {
149
        switch ((uint8_t) *name) {
150
        case 0xe5:
151
            d->name[i] = FAT_DENTRY_E5_ESC;
152
            name++;
153
            break;
154
        case '\0':
155
        case '.':
156
            d->name[i] = FAT_PAD;
157
            break;
158
        default:
159
            d->name[i] = toupper(*name++);
160
            break;
161
        }
162
    }
163
    if (*name++ != '.')
164
        name = fake_ext;
165
    for (i = 0; i < FAT_EXT_LEN; i++) {
166
        switch ((uint8_t) *name) {
167
        case 0xe5:
168
            d->ext[i] = FAT_DENTRY_E5_ESC;
169
            name++;
170
            break;
171
        case '\0':
172
            d->ext[i] = FAT_PAD;
173
            break;
174
        default:
175
            d->ext[i] = toupper(*name++);
176
            break;
177
        }
178
    }
179
}
180
 
181
fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *d)
182
{
183
    if (d->attr & FAT_ATTR_VOLLABEL) {
184
        /* volume label entry */
185
        return FAT_DENTRY_SKIP;
186
    }
187
    if (d->name[0] == FAT_DENTRY_ERASED) {
188
        /* not-currently-used entry */
189
        return FAT_DENTRY_FREE;
190
    }
191
    if (d->name[0] == FAT_DENTRY_UNUSED) {
192
        /* never used entry */
193
        return FAT_DENTRY_LAST;
194
    }
195
    if (d->name[0] == FAT_DENTRY_DOT) {
196
        /*
197
         * Most likely '.' or '..'.
198
         * It cannot occur in a regular file name.
199
         */
200
        return FAT_DENTRY_SKIP;
201
    }
202
    return FAT_DENTRY_VALID;
203
}
204
 
205
/**
206
 * @}
207
 */