2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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
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 General Public License for more details.
17 /* initialize a list head/item */
18 static inline void uci_list_init(struct uci_list *ptr)
24 /* inserts a new list entry after a given entry */
25 static inline void uci_list_insert(struct uci_list *list, struct uci_list *ptr)
27 list->next->prev = ptr;
29 ptr->next = list->next;
33 /* inserts a new list entry at the tail of the list */
34 static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
36 /* NB: head->prev points at the tail */
37 uci_list_insert(head->prev, ptr);
40 static inline void uci_list_del(struct uci_list *ptr)
42 struct uci_list *next, *prev;
54 * uci_alloc_generic allocates a new uci_element with payload
55 * payload is appended to the struct to save memory and reduce fragmentation
57 static struct uci_element *
58 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
60 struct uci_element *e;
63 ptr = uci_malloc(ctx, size + strlen(name) + 1);
64 e = (struct uci_element *) ptr;
66 e->name = (char *) ptr + size;
67 strcpy(e->name, name);
68 uci_list_init(&e->list);
74 uci_free_element(struct uci_element *e)
76 if (!uci_list_empty(&e->list))
77 uci_list_del(&e->list);
81 static struct uci_option *
82 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
84 struct uci_package *p = s->package;
85 struct uci_context *ctx = p->ctx;
88 o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
89 o->value = uci_dataptr(o);
91 strcpy(o->value, value);
92 uci_list_add(&s->options, &o->e.list);
98 uci_free_option(struct uci_option *o)
100 uci_free_element(&o->e);
103 static struct uci_section *
104 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
106 struct uci_context *ctx = p->ctx;
107 struct uci_section *s;
110 if (!name || !name[0]) {
111 snprintf(buf, 16, "cfg%d", p->n_section);
115 s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
116 s->type = uci_dataptr(s);
118 strcpy(s->type, type);
119 uci_list_init(&s->options);
120 uci_list_add(&p->sections, &s->e.list);
126 uci_free_section(struct uci_section *s)
128 struct uci_element *o, *tmp;
130 uci_foreach_element_safe(&s->options, tmp, o) {
131 uci_free_option(uci_to_option(o));
133 uci_free_element(&s->e);
136 static struct uci_package *
137 uci_alloc_package(struct uci_context *ctx, const char *name)
139 struct uci_package *p;
141 p = uci_alloc_element(ctx, package, name, 0);
143 uci_list_init(&p->sections);
144 uci_list_init(&p->history);
149 uci_free_package(struct uci_package *p)
151 struct uci_element *e, *tmp;
158 uci_foreach_element_safe(&p->sections, tmp, e) {
159 uci_free_section(uci_to_section(e));
161 uci_free_element(&p->e);
164 /* record a change that was done to a package */
166 uci_add_history(struct uci_context *ctx, struct uci_package *p, int cmd, char *section, char *option, char *value)
168 struct uci_history *h = (struct uci_history *) uci_malloc(ctx, sizeof(struct uci_history));
170 uci_list_init(&h->list);
172 h->section = section;
175 uci_list_add(&p->history, &h->list);
179 static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, const char *name)
181 struct uci_element *e;
183 uci_foreach_element(list, e) {
184 if (!strcmp(e->name, name))
187 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
190 int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *p, char *section, char *option)
192 struct uci_element *e;
193 struct uci_section *s;
194 struct uci_option *o;
197 UCI_ASSERT(ctx, res != NULL);
198 UCI_ASSERT(ctx, p != NULL);
200 e = uci_lookup_list(ctx, &p->sections, section);
204 s = uci_to_section(e);
205 e = uci_lookup_list(ctx, &s->options, option);
212 int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value)
216 struct uci_list *list;
217 struct uci_element *e;
220 UCI_ASSERT(ctx, value != NULL);
221 UCI_ASSERT(ctx, element != NULL);
222 UCI_ASSERT(ctx, *element != NULL);
224 /* what the 'value' of an element means depends on the type
225 * for a section, the 'value' means its type
226 * for an option, the 'value' means its value string
227 * when changing the value, shrink the element to its actual size
228 * (it may have been allocated with a bigger size, to include
230 * then duplicate the string passed on the command line and
231 * insert it into the structure.
236 case UCI_TYPE_SECTION:
237 size = sizeof(struct uci_section);
239 case UCI_TYPE_OPTION:
240 size = sizeof(struct uci_option);
243 UCI_THROW(ctx, UCI_ERR_INVAL);
247 uci_list_del(&e->list);
248 e = uci_realloc(ctx, e, size);
249 str = uci_strdup(ctx, value);
250 uci_list_insert(list, &e->list);
254 case UCI_TYPE_SECTION:
255 uci_to_section(e)->type = value;
257 case UCI_TYPE_OPTION:
258 uci_to_option(e)->value = value;
267 int uci_set(struct uci_context *ctx, char *package, char *section, char *option, char *value)
269 struct uci_element *e;
270 struct uci_package *p = NULL;
271 struct uci_section *s = NULL;
272 struct uci_option *o = NULL;
273 struct uci_history *h;
276 UCI_ASSERT(ctx, package != NULL);
277 UCI_ASSERT(ctx, section != NULL);
280 * look up the package, section and option (if set)
281 * if the section/option is to be modified and it is not found
282 * create a new element in the appropriate list
284 UCI_TRAP_SAVE(ctx, notfound);
285 e = uci_lookup_list(ctx, &ctx->root, package);
289 p = uci_to_package(e);
290 e = uci_lookup_list(ctx, &p->sections, section);
293 s = uci_to_section(e);
296 e = uci_lookup_list(ctx, &s->options, option);
299 o = uci_to_option(e);
301 UCI_TRAP_RESTORE(ctx);
304 * no unknown element was supplied, assume that we can just update
312 uci_add_history(ctx, p, UCI_CMD_CHANGE, section, option, value);
313 return uci_set_element_value(ctx, &e, value);
317 * the entry that we need to update was not found,
318 * check if the search failed prematurely.
319 * this can happen if the package was not found, or if
320 * an option was supplied, but the section wasn't found
322 if (!p || (!s && option))
323 UCI_THROW(ctx, ctx->errno);
325 /* now add the missing entry */
326 uci_add_history(ctx, p, UCI_CMD_ADD, section, option, value);
328 uci_alloc_option(s, option, value);
330 uci_alloc_section(p, section, value);
335 int uci_unload(struct uci_context *ctx, struct uci_package *p)
337 struct uci_element *e;
340 UCI_ASSERT(ctx, p != NULL);