summaryrefslogtreecommitdiffstats
path: root/avahi-utils/stdb.c
blob: a4203647aca107a8bb80cde358d5fee8ed8e5f67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/* $Id$ */

/***
  This file is part of avahi.
 
  avahi is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.
 
  avahi is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#include <config.h>
#ifdef HAVE_GDBM
#include <gdbm.h>
#endif
#ifdef HAVE_DBM
#include <ndbm.h>
#include <fcntl.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <stdio.h>

#include <avahi-common/malloc.h>

#include "stdb.h"

#ifdef HAVE_GDBM
static GDBM_FILE gdbm_file = NULL;
#endif
#ifdef HAVE_DBM
static DBM *dbm_file = NULL;
#endif
static char *buffer = NULL;
static char *enum_key = NULL;

static int init(void) {

#ifdef HAVE_GDBM
    if (gdbm_file)
        return 0;

    if (!(gdbm_file = gdbm_open((char*) DATABASE_FILE, 0, GDBM_READER, 0, NULL)))
        return -1;
#endif
#ifdef HAVE_DBM
    if (dbm_file)
        return 0;

    if (!(dbm_file = dbm_open((char*) DATABASE_FILE, O_RDONLY, 0)))
        return -1;
#endif

    return 0;
}

const char* stdb_lookup(const char *name) {
    datum key, data;
    const char *loc;

    if (init() < 0)
        goto fail;

    data.dptr = NULL;
    data.dsize = 0;
    
    if ((loc = setlocale(LC_MESSAGES, NULL))) {
        char k[256];
        
        snprintf(k, sizeof(k), "%s[%s]", name, loc);
        key.dptr = k;
        key.dsize = strlen(k);
#ifdef HAVE_GDBM
        data = gdbm_fetch(gdbm_file, key);
#endif
#ifdef HAVE_DBM
        data = dbm_fetch(dbm_file, key);
#endif

        if (!data.dptr) {
            char l[32], *e;
            snprintf(l, sizeof(l), "%s", loc);
            
            if ((e = strchr(l, '@'))) {
                *e = 0;
                snprintf(k, sizeof(k), "%s[%s]", name, l);
                key.dptr = k;
                key.dsize = strlen(k);
#ifdef HAVE_GDBM
                data = gdbm_fetch(gdbm_file, key);
#endif
#ifdef HAVE_DBM
                data = dbm_fetch(dbm_file, key);
#endif
            }

            if (!data.dptr) {
                if ((e = strchr(l, '_'))) {
                    *e = 0;
                    snprintf(k, sizeof(k), "%s[%s]", name, l);
                    key.dptr = k;
                    key.dsize = strlen(k);
#ifdef HAVE_GDBM
                    data = gdbm_fetch(gdbm_file, key);
#endif
#ifdef HAVE_DBM
                    data = dbm_fetch(dbm_file, key);
#endif
                }
            }
        }
    }

    if (!data.dptr) {
        key.dptr = (char*) name;
        key.dsize = strlen(name);
#ifdef HAVE_GDBM
        data = gdbm_fetch(gdbm_file, key);
#endif
#ifdef HAVE_DBM
        data = dbm_fetch(dbm_file, key);
#endif
    }

    if (!data.dptr)
        goto fail;

    avahi_free(buffer);
    buffer = avahi_strndup(data.dptr, data.dsize);
    free(data.dptr);
    
    return buffer;
    
fail:

    return name;
}

void stdb_shutdown(void) {
#ifdef HAVE_GDBM
    if (gdbm_file)
        gdbm_close(gdbm_file);

    gdbm_file = NULL;
#endif
#ifdef HAVE_DBM
    if (dbm_file)
        dbm_close(dbm_file);

    dbm_file = NULL;
#endif

    avahi_free(buffer);
    avahi_free(enum_key);

    buffer = enum_key = NULL;
}

char *stdb_getent(void) {
    datum key;
    
    if (init() < 0)
        return NULL;

    for (;;) {
    
        if (!enum_key) {
#ifdef HAVE_GDBM
            key = gdbm_firstkey(gdbm_file);
#endif
#ifdef HAVE_DBM
            key = dbm_firstkey(dbm_file);
#endif
        } else {
            key.dptr = enum_key;
            key.dsize = strlen(enum_key);
            
#ifdef HAVE_GDBM
            key = gdbm_nextkey(gdbm_file, key);
#endif
#ifdef HAVE_DBM
            key = dbm_nextkey(dbm_file, key);
#endif
        }

        avahi_free(enum_key);
        enum_key = NULL;
        
        if (!key.dptr)
            return NULL;
    
        enum_key = avahi_strndup(key.dptr, key.dsize);
        free(key.dptr);

        if (!strchr(enum_key, '['))
            return enum_key;
    }
}

void stdb_setent(void) {
    avahi_free(enum_key);
    enum_key = NULL;
}