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.
15 static void uci_list_set_pos(struct uci_list *head, struct uci_list *ptr, int pos)
17 struct uci_list *new_head = head;
18 struct uci_element *p = NULL;
21 uci_foreach_element(head, p) {
26 uci_list_add(new_head, ptr);
29 static inline void uci_list_fixup(struct uci_list *ptr)
31 ptr->prev->next = ptr;
32 ptr->next->prev = ptr;
36 * uci_alloc_generic allocates a new uci_element with payload
37 * payload is appended to the struct to save memory and reduce fragmentation
39 __private struct uci_element *
40 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
42 struct uci_element *e;
46 ptr = uci_malloc(ctx, datalen);
47 e = (struct uci_element *) ptr;
50 UCI_TRAP_SAVE(ctx, error);
51 e->name = uci_strdup(ctx, name);
52 UCI_TRAP_RESTORE(ctx);
54 uci_list_init(&e->list);
59 UCI_THROW(ctx, ctx->err);
66 uci_free_element(struct uci_element *e)
70 if (!uci_list_empty(&e->list))
71 uci_list_del(&e->list);
75 static struct uci_option *
76 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
78 struct uci_package *p = s->package;
79 struct uci_context *ctx = p->ctx;
82 o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
83 o->type = UCI_TYPE_STRING;
84 o->v.string = uci_dataptr(o);
86 strcpy(o->v.string, value);
87 uci_list_add(&s->options, &o->e.list);
93 uci_free_option(struct uci_option *o)
95 struct uci_element *e, *tmp;
99 if ((o->v.string != uci_dataptr(o)) &&
100 (o->v.string != NULL))
104 uci_foreach_element_safe(&o->v.list, tmp, e) {
111 uci_free_element(&o->e);
114 static struct uci_option *
115 uci_alloc_list(struct uci_section *s, const char *name)
117 struct uci_package *p = s->package;
118 struct uci_context *ctx = p->ctx;
119 struct uci_option *o;
121 o = uci_alloc_element(ctx, option, name, 0);
122 o->type = UCI_TYPE_LIST;
124 uci_list_init(&o->v.list);
125 uci_list_add(&s->options, &o->e.list);
130 /* Based on an efficient hash function published by D. J. Bernstein */
131 static unsigned int djbhash(unsigned int hash, char *str)
133 int len = strlen(str);
140 for(i = 0; i < len; i++) {
141 hash = ((hash << 5) + hash) + str[i];
143 return (hash & 0x7FFFFFFF);
146 /* fix up an unnamed section, e.g. after adding options to it */
147 __private void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
149 unsigned int hash = ~0;
150 struct uci_element *e;
157 * Generate a name for unnamed sections. This is used as reference
158 * when locating or updating the section from apps/scripts.
159 * To make multiple concurrent versions somewhat safe for updating,
160 * the name is generated from a hash of its type and name/value
161 * pairs of its option, and it is prefixed by a counter value.
162 * If the order of the unnamed sections changes for some reason,
163 * updates to them will be rejected.
165 hash = djbhash(hash, s->type);
166 uci_foreach_element(&s->options, e) {
167 struct uci_option *o;
168 hash = djbhash(hash, e->name);
169 o = uci_to_option(e);
171 case UCI_TYPE_STRING:
172 hash = djbhash(hash, o->v.string);
178 sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
179 s->e.name = uci_strdup(ctx, buf);
182 static struct uci_section *
183 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
185 struct uci_context *ctx = p->ctx;
186 struct uci_section *s;
188 if (name && !name[0])
191 s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
192 uci_list_init(&s->options);
193 s->type = uci_dataptr(s);
195 strcpy(s->type, type);
200 uci_list_add(&p->sections, &s->e.list);
206 uci_free_section(struct uci_section *s)
208 struct uci_element *o, *tmp;
210 uci_foreach_element_safe(&s->options, tmp, o) {
211 uci_free_option(uci_to_option(o));
213 if ((s->type != uci_dataptr(s)) &&
216 uci_free_element(&s->e);
219 __plugin struct uci_package *
220 uci_alloc_package(struct uci_context *ctx, const char *name)
222 struct uci_package *p;
224 p = uci_alloc_element(ctx, package, name, 0);
226 uci_list_init(&p->sections);
227 uci_list_init(&p->delta);
228 uci_list_init(&p->saved_delta);
233 uci_free_package(struct uci_package **package)
235 struct uci_element *e, *tmp;
236 struct uci_package *p = *package;
243 uci_foreach_element_safe(&p->sections, tmp, e) {
244 uci_free_section(uci_to_section(e));
246 uci_foreach_element_safe(&p->delta, tmp, e) {
247 uci_free_delta(uci_to_delta(e));
249 uci_foreach_element_safe(&p->saved_delta, tmp, e) {
250 uci_free_delta(uci_to_delta(e));
252 uci_free_element(&p->e);
257 uci_free_any(struct uci_element **e)
260 case UCI_TYPE_SECTION:
261 uci_free_section(uci_to_section(*e));
263 case UCI_TYPE_OPTION:
264 uci_free_option(uci_to_option(*e));
272 __private struct uci_element *
273 uci_lookup_list(struct uci_list *list, const char *name)
275 struct uci_element *e;
277 uci_foreach_element(list, e) {
278 if (!strcmp(e->name, name))
284 static struct uci_element *
285 uci_lookup_ext_section(struct uci_context *ctx, struct uci_ptr *ptr)
287 char *idxstr, *t, *section, *name;
288 struct uci_element *e = NULL;
289 struct uci_section *s;
292 section = uci_strdup(ctx, ptr->section);
293 name = idxstr = section + 1;
295 if (section[0] != '@')
298 /* parse the section index part */
299 idxstr = strchr(idxstr, '[');
305 t = strchr(idxstr, ']');
313 idx = strtol(idxstr, &t, 10);
319 else if (!uci_validate_type(name))
322 /* if the given index is negative, it specifies the section number from
323 * the end of the list */
326 uci_foreach_element(&ptr->p->sections, e) {
327 s = uci_to_section(e);
328 if (name && (strcmp(s->type, name) != 0))
337 uci_foreach_element(&ptr->p->sections, e) {
338 s = uci_to_section(e);
339 if (name && (strcmp(s->type, name) != 0))
351 memset(ptr, 0, sizeof(struct uci_ptr));
352 UCI_THROW(ctx, UCI_ERR_INVAL);
356 ptr->section = e->name;
361 uci_lookup_next(struct uci_context *ctx, struct uci_element **e, struct uci_list *list, const char *name)
365 *e = uci_lookup_list(list, name);
367 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
373 uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended)
375 struct uci_element *e;
378 UCI_ASSERT(ctx, ptr != NULL);
381 UCI_INTERNAL(uci_parse_ptr, ctx, ptr, str);
383 ptr->flags |= UCI_LOOKUP_DONE;
385 /* look up the package first */
389 e = uci_lookup_list(&ctx->root, ptr->package);
392 UCI_INTERNAL(uci_load, ctx, ptr->package, &ptr->p);
395 ptr->last = &ptr->p->e;
397 ptr->p = uci_to_package(e);
401 if (!ptr->section && !ptr->s)
404 /* if the section name validates as a regular name, pass through
405 * to the regular uci_lookup function call */
408 } else if (ptr->flags & UCI_LOOKUP_EXTENDED) {
410 e = uci_lookup_ext_section(ctx, ptr);
412 UCI_THROW(ctx, UCI_ERR_INVAL);
414 e = uci_lookup_list(&ptr->p->sections, ptr->section);
421 ptr->s = uci_to_section(e);
424 e = uci_lookup_list(&ptr->s->options, ptr->option);
428 ptr->o = uci_to_option(e);
433 ptr->flags |= UCI_LOOKUP_COMPLETE;
438 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
442 __private struct uci_element *
443 uci_expand_ptr(struct uci_context *ctx, struct uci_ptr *ptr, bool complete)
445 UCI_ASSERT(ctx, ptr != NULL);
447 if (!(ptr->flags & UCI_LOOKUP_DONE))
448 UCI_INTERNAL(uci_lookup_ptr, ctx, ptr, NULL, 1);
449 if (complete && !(ptr->flags & UCI_LOOKUP_COMPLETE))
450 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
451 UCI_ASSERT(ctx, ptr->p != NULL);
453 /* fill in missing string info */
454 if (ptr->p && !ptr->package)
455 ptr->package = ptr->p->e.name;
456 if (ptr->s && !ptr->section)
457 ptr->section = ptr->s->e.name;
458 if (ptr->o && !ptr->option)
459 ptr->option = ptr->o->e.name;
471 static void uci_add_element_list(struct uci_context *ctx, struct uci_ptr *ptr, bool internal)
473 struct uci_element *e;
474 struct uci_package *p;
477 if (!internal && p->has_delta)
478 uci_add_delta(ctx, &p->delta, UCI_CMD_LIST_ADD, ptr->section, ptr->option, ptr->value);
480 e = uci_alloc_generic(ctx, UCI_TYPE_ITEM, ptr->value, sizeof(struct uci_option));
481 uci_list_add(&ptr->o->v.list, &e->list);
484 int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr)
486 /* NB: UCI_INTERNAL use means without delta tracking */
487 bool internal = ctx->internal;
488 struct uci_element *e;
489 struct uci_package *p;
494 e = uci_expand_ptr(ctx, ptr, true);
497 UCI_ASSERT(ctx, ptr->s);
498 UCI_ASSERT(ctx, ptr->value);
500 if (!internal && p->has_delta)
501 uci_add_delta(ctx, &p->delta, UCI_CMD_RENAME, ptr->section, ptr->option, ptr->value);
503 n = uci_strdup(ctx, ptr->value);
508 if (e->type == UCI_TYPE_SECTION)
509 uci_to_section(e)->anonymous = false;
514 int uci_reorder_section(struct uci_context *ctx, struct uci_section *s, int pos)
516 struct uci_package *p = s->package;
521 uci_list_set_pos(&s->package->sections, &s->e.list, pos);
522 if (!ctx->internal && p->has_delta) {
523 sprintf(order, "%d", pos);
524 uci_add_delta(ctx, &p->delta, UCI_CMD_REORDER, s->e.name, NULL, order);
530 int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res)
532 bool internal = ctx->internal;
533 struct uci_section *s;
536 UCI_ASSERT(ctx, p != NULL);
537 s = uci_alloc_section(p, type, NULL);
538 uci_fixup_section(ctx, s);
540 if (!internal && p->has_delta)
541 uci_add_delta(ctx, &p->delta, UCI_CMD_ADD, s->e.name, NULL, type);
546 int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr)
548 /* NB: pass on internal flag to uci_del_element */
549 bool internal = ctx->internal;
550 struct uci_package *p;
551 struct uci_element *e;
555 e = uci_expand_ptr(ctx, ptr, true);
558 UCI_ASSERT(ctx, ptr->s);
560 if (!internal && p->has_delta)
561 uci_add_delta(ctx, &p->delta, UCI_CMD_REMOVE, ptr->section, ptr->option, NULL);
567 else if (ptr->section)
573 int uci_add_list(struct uci_context *ctx, struct uci_ptr *ptr)
575 /* NB: UCI_INTERNAL use means without delta tracking */
576 bool internal = ctx->internal;
577 struct uci_option *prev = NULL;
578 const char *value2 = NULL;
582 uci_expand_ptr(ctx, ptr, false);
583 UCI_ASSERT(ctx, ptr->s);
584 UCI_ASSERT(ctx, ptr->value);
587 switch (ptr->o->type) {
588 case UCI_TYPE_STRING:
589 /* we already have a string value, convert that to a list */
592 ptr->value = ptr->o->v.string;
595 uci_add_element_list(ctx, ptr, internal);
598 UCI_THROW(ctx, UCI_ERR_INVAL);
603 ptr->o = uci_alloc_list(ptr->s, ptr->option);
605 uci_add_element_list(ctx, ptr, true);
606 uci_free_option(prev);
609 uci_add_element_list(ctx, ptr, internal);
614 int uci_set(struct uci_context *ctx, struct uci_ptr *ptr)
616 /* NB: UCI_INTERNAL use means without delta tracking */
617 bool internal = ctx->internal;
620 uci_expand_ptr(ctx, ptr, false);
621 UCI_ASSERT(ctx, ptr->value);
622 UCI_ASSERT(ctx, ptr->s || (!ptr->option && ptr->section));
623 if (!ptr->option && ptr->value[0]) {
624 UCI_ASSERT(ctx, uci_validate_type(ptr->value));
627 if (!ptr->o && ptr->s && ptr->option) {
628 struct uci_element *e;
629 e = uci_lookup_list(&ptr->s->options, ptr->option);
631 ptr->o = uci_to_option(e);
633 if (!ptr->value[0]) {
634 /* if setting a nonexistant option/section to a nonexistant value,
635 * exit without errors */
636 if (!(ptr->flags & UCI_LOOKUP_COMPLETE))
639 return uci_delete(ctx, ptr);
640 } else if (!ptr->o && ptr->option) { /* new option */
641 ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value);
642 ptr->last = &ptr->o->e;
643 } else if (!ptr->s && ptr->section) { /* new section */
644 ptr->s = uci_alloc_section(ptr->p, ptr->value, ptr->section);
645 ptr->last = &ptr->s->e;
646 } else if (ptr->o && ptr->option) { /* update option */
647 if ((ptr->o->type == UCI_TYPE_STRING) &&
648 !strcmp(ptr->o->v.string, ptr->value))
650 uci_free_option(ptr->o);
651 ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value);
652 ptr->last = &ptr->o->e;
653 } else if (ptr->s && ptr->section) { /* update section */
654 char *s = uci_strdup(ctx, ptr->value);
656 if (ptr->s->type == uci_dataptr(ptr->s)) {
658 ptr->last = uci_realloc(ctx, ptr->s, sizeof(struct uci_section));
659 ptr->s = uci_to_section(ptr->last);
660 uci_list_fixup(&ptr->s->e.list);
666 UCI_THROW(ctx, UCI_ERR_INVAL);
669 if (!internal && ptr->p->has_delta)
670 uci_add_delta(ctx, &ptr->p->delta, UCI_CMD_CHANGE, ptr->section, ptr->option, ptr->value);
675 int uci_unload(struct uci_context *ctx, struct uci_package *p)
678 UCI_ASSERT(ctx, p != NULL);
680 uci_free_package(&p);