summary refs log tree commit diff
path: root/Src/Modules/db_gdbm.c
blob: 9cc9648d1fc3d9036978015649ef4e4b817f3365 (plain) (blame)
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
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 * db_gdbm.c - bindings for gdbm
 *
 * This file is part of zsh, the Z shell.
 *
 * Copyright (c) 2008 Clint Adams
 * All rights reserved.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and to distribute modified versions of this software for any
 * purpose, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * In no event shall Clint Adams or the Zsh Development
 * Group be liable to any party for direct, indirect, special, incidental, or
 * consequential damages arising out of the use of this software and its
 * documentation, even if Peter Stephenson, Sven Wischnowsky and the Zsh
 * Development Group have been advised of the possibility of such damage.
 *
 * Clint Adams and the Zsh Development Group
 * specifically disclaim any warranties, including, but not limited to, the
 * implied warranties of merchantability and fitness for a particular purpose.
 * The software provided hereunder is on an "as is" basis, and Peter
 * Stephenson, Sven Wischnowsky and the Zsh Development Group have no
 * obligation to provide maintenance, support, updates, enhancements, or
 * modifications.
 *
 */

#include "db_gdbm.mdh"
#include "db_gdbm.pro"

/*
 * Make sure we have all the bits I'm using for memory mapping, otherwise
 * I don't know what I'm doing.
 */
#if defined(HAVE_GDBM_H) && defined(HAVE_GDBM_OPEN)

#include <gdbm.h>

static const struct gsu_scalar gdbm_gsu =
{ gdbmgetfn, gdbmsetfn, gdbmunsetfn };

static struct builtin bintab[] = {
    BUILTIN("ztie", 0, bin_ztie, 1, -1, 0, "d:f:", NULL),
    BUILTIN("zuntie", 0, bin_zuntie, 1, -1, 0, NULL, NULL),
};

GDBM_FILE dbf = NULL;
Param tied_param;

/**/
static int
bin_ztie(char *nam, char **args, Options ops, UNUSED(int func))
{
    char *resource_name, *pmname;

    if(!OPT_ISSET(ops,'d')) {
        zwarnnam(nam, "you must pass `-d db/gdbm' to ztie", NULL);
	return 1;
    }
    if(!OPT_ISSET(ops,'f')) {
        zwarnnam(nam, "you must pass `-f' with a filename to ztie", NULL);
	return 1;
    }

    /* Here should be a lookup of the backend type against
     * a registry.
     */

    if(dbf) {
        zwarnnam(nam, "something is already ztied and this implementation is flawed", NULL);
	return 1;
    }

    pmname = ztrdup(*args);

    resource_name = OPT_ARG(ops, 'f');

    if (!(tied_param = createspecialhash(pmname, &getgdbmnode, &scangdbmkeys, PM_SPECIAL | PM_HASHED))) {
        zwarnnam(nam, "cannot create the requested parameter name", NULL);
	return 1;
    }

    dbf = gdbm_open(resource_name, 0, GDBM_WRCREAT | GDBM_SYNC, 0666, 0);
    if(!dbf) {
        zwarnnam(nam, "error opening database file %s", resource_name);
	return 1;
    }

    return 0;
}

/**/
static int
bin_zuntie(char *nam, char **args, Options ops, UNUSED(int func))
{
    paramtab->removenode(paramtab, tied_param->node.nam);
    free(tied_param);
    tied_param = NULL;
    gdbm_close(dbf);
    dbf = NULL;

    return 0;
}

/**/
static char *
gdbmgetfn(Param pm)
{
    datum key, content;
    int ret;

    key.dptr = pm->node.nam;
    key.dsize = strlen(key.dptr) + 1;

    ret = gdbm_exists(dbf, key);
    if(ret) {
        content = gdbm_fetch(dbf, key);
    } else {
        content.dptr = dupstring("");
    }

    return content.dptr;
}

/**/
static void
gdbmsetfn(Param pm, char **val)
{
    datum key, content;
    int ret;

    key.dptr = pm->node.nam;
    key.dsize = strlen(key.dptr) + 1;
    content.dptr = val;
    content.dsize = strlen(content.dptr) + 1;

    ret = gdbm_store(dbf, key, content, GDBM_REPLACE);
}

/**/
static void
gdbmunsetfn(Param pm, int um)
{
    datum key;
    int ret;

    key.dptr = pm->node.nam;
    key.dsize = strlen(key.dptr) + 1;

    ret = gdbm_delete(dbf, key);
}

/**/
static HashNode
getgdbmnode(UNUSED(HashTable ht), const char *name)
{
    int len, ret;
    char *nameu;
    datum content, key;
    Param pm = NULL;

    nameu = dupstring(name);
    unmetafy(nameu, &len);
    key.dptr = nameu;

    pm = (Param) hcalloc(sizeof(struct param));
    pm->node.nam = nameu;
    pm->node.flags = PM_SCALAR;
    pm->gsu.s = &gdbm_gsu;

    return &pm->node;
}

/**/
static void
scangdbmkeys(UNUSED(HashTable ht), ScanFunc func, int flags)
{
    Param pm = NULL;
    datum key, content;

    pm = (Param) hcalloc(sizeof(struct param));

    pm->node.flags = PM_SCALAR;
    pm->gsu.s = &nullsetscalar_gsu;

    key = gdbm_firstkey(dbf);

    while(key.dptr) {
	content = gdbm_fetch(dbf, key);

	pm->node.nam = key.dptr;
	pm->u.str = content.dptr;
	pm->gsu.s = &nullsetscalar_gsu;

	func(&pm->node, flags);

        key = gdbm_nextkey(dbf, key);
    }

}

#else
# error no gdbm
#endif /* have gdbm */

static struct features module_features = {
    bintab, sizeof(bintab)/sizeof(*bintab),
    NULL, 0,
    NULL, 0,
    NULL, 0,
    0
};

/**/
int
setup_(UNUSED(Module m))
{
    return 0;
}

/**/
int
features_(Module m, char ***features)
{
    *features = featuresarray(m, &module_features);
    return 0;
}

/**/
int
enables_(Module m, int **enables)
{
    return handlefeatures(m, &module_features, enables);
}

/**/
int
boot_(UNUSED(Module m))
{
    return 0;
}

/**/
int
cleanup_(UNUSED(Module m))
{
    return setfeatureenables(m, &module_features, NULL);
}

/**/
int
finish_(UNUSED(Module m))
{
    return 0;
}