delta: fix adding new savedir.
[project/uci.git] / blob.c
1 /*
2 * blob.c - uci <-> blobmsg conversion layer
3 * Copyright (C) 2012-2013 Felix Fietkau <nbd@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU Lesser General Public License for more details.
13 */
14 #include <string.h>
15 #include <stdlib.h>
16 #include <stdio.h>
17
18 #include <libubox/blobmsg.h>
19 #include "uci.h"
20 #include "uci_blob.h"
21
22 static bool
23 uci_attr_to_blob(struct blob_buf *b, const char *str,
24 const char *name, enum blobmsg_type type)
25 {
26 char *err;
27 int intval;
28 long long llval;
29
30 switch (type) {
31 case BLOBMSG_TYPE_STRING:
32 blobmsg_add_string(b, name, str);
33 break;
34 case BLOBMSG_TYPE_BOOL:
35 if (!strcmp(str, "true") || !strcmp(str, "1"))
36 intval = 1;
37 else if (!strcmp(str, "false") || !strcmp(str, "0"))
38 intval = 0;
39 else
40 return false;
41
42 blobmsg_add_u8(b, name, intval);
43 break;
44 case BLOBMSG_TYPE_INT32:
45 intval = strtol(str, &err, 0);
46 if (*err)
47 return false;
48
49 blobmsg_add_u32(b, name, intval);
50 break;
51 case BLOBMSG_TYPE_INT64:
52 llval = strtoll(str, &err, 0);
53 if (*err)
54 return false;
55
56 blobmsg_add_u64(b, name, llval);
57 break;
58 default:
59 return false;
60 }
61 return true;
62 }
63
64 static void
65 uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
66 enum blobmsg_type type)
67 {
68 struct uci_element *e;
69 char *str, *next, *word;
70
71 if (o->type == UCI_TYPE_LIST) {
72 uci_foreach_element(&o->v.list, e) {
73 uci_attr_to_blob(b, e->name, NULL, type);
74 }
75 return;
76 }
77
78 str = strdup(o->v.string);
79 next = str;
80
81 while ((word = strsep(&next, " \t")) != NULL) {
82 if (!*word)
83 continue;
84
85 uci_attr_to_blob(b, word, NULL, type);
86 }
87
88 free(str);
89 }
90
91 static int
92 __uci_element_to_blob(struct blob_buf *b, struct uci_element *e,
93 const struct uci_blob_param_list *p)
94 {
95 const struct blobmsg_policy *attr = NULL;
96 struct uci_option *o = uci_to_option(e);
97 unsigned int types = 0;
98 void *array;
99 int i, ret = 0;
100
101 for (i = 0; i < p->n_params; i++) {
102 attr = &p->params[i];
103
104 if (strcmp(attr->name, e->name) != 0)
105 continue;
106
107 if (attr->type > BLOBMSG_TYPE_LAST)
108 continue;
109
110 if (types & (1 << attr->type))
111 continue;
112
113 types |= 1 << attr->type;
114
115 if (attr->type == BLOBMSG_TYPE_ARRAY) {
116 int element_type = 0;
117
118 if (p->info)
119 element_type = p->info[i].type;
120
121 if (!element_type)
122 element_type = BLOBMSG_TYPE_STRING;
123
124 array = blobmsg_open_array(b, attr->name);
125 uci_array_to_blob(b, o, element_type);
126 blobmsg_close_array(b, array);
127 ret++;
128 continue;
129 }
130
131 if (o->type == UCI_TYPE_LIST)
132 continue;
133
134 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
135 }
136 return ret;
137 }
138
139 static int
140 __uci_to_blob(struct blob_buf *b, struct uci_section *s,
141 const struct uci_blob_param_list *p)
142 {
143 struct uci_element *e;
144 int ret = 0;
145
146 uci_foreach_element(&s->options, e)
147 ret += __uci_element_to_blob(b, e, p);
148
149 return ret;
150 }
151
152 int
153 uci_to_blob(struct blob_buf *b, struct uci_section *s,
154 const struct uci_blob_param_list *p)
155 {
156 int ret = 0;
157 int i;
158
159 ret += __uci_to_blob(b, s, p);
160 for (i = 0; i < p->n_next; i++)
161 ret += uci_to_blob(b, s, p->next[i]);
162
163 return ret;
164 }
165
166 bool
167 uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
168 const struct uci_blob_param_list *config, unsigned long *diff)
169 {
170 bool ret = false;
171 int i;
172
173 for (i = 0; i < config->n_params; i++) {
174 if (!tb1[i] && !tb2[i])
175 continue;
176
177 if (!!tb1[i] != !!tb2[i])
178 goto mark;
179
180 if (blob_len(tb1[i]) != blob_len(tb2[i]))
181 goto mark;
182
183 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
184 goto mark;
185
186 continue;
187
188 mark:
189 ret = true;
190 if (diff)
191 bitfield_set(diff, i);
192 else
193 return ret;
194 }
195
196 return ret;
197 }
198
199
200 static bool
201 __uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
202 const struct uci_blob_param_list *config)
203 {
204 struct blob_attr **tb1, **tb2;
205
206 if (!!c1 ^ !!c2)
207 return false;
208
209 if (!c1 && !c2)
210 return true;
211
212 tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
213 blobmsg_parse(config->params, config->n_params, tb1,
214 blob_data(c1), blob_len(c1));
215
216 tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
217 blobmsg_parse(config->params, config->n_params, tb2,
218 blob_data(c2), blob_len(c2));
219
220 return !uci_blob_diff(tb1, tb2, config, NULL);
221 }
222
223 bool
224 uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
225 const struct uci_blob_param_list *config)
226 {
227 int i;
228
229 if (!__uci_blob_check_equal(c1, c2, config))
230 return false;
231
232 for (i = 0; i < config->n_next; i++) {
233 if (!__uci_blob_check_equal(c1, c2, config->next[i]))
234 return false;
235 }
236
237 return true;
238 }