list.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 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 General Public License for more details.
  13  */
  14
  15 /* initialize a list head/item */
  16 static inline void uci_list_init(struct uci_list *ptr)
  17 {
  18         ptr->prev = ptr;
  19         ptr->next = ptr;
  20 }
  21
  22 /* inserts a new list entry after a given entry */
  23 static inline void uci_list_insert(struct uci_list *list, struct uci_list *ptr)
  24 {
  25         list->next->prev = ptr;
  26         ptr->prev = list;
  27         ptr->next = list->next;
  28         list->next = ptr;
  29 }
  30
  31 /* inserts a new list entry at the tail of the list */
  32 static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
  33 {
  34         /* NB: head->prev points at the tail */
  35         uci_list_insert(head->prev, ptr);
  36 }
  37
  38 static inline void uci_list_del(struct uci_list *ptr)
  39 {
  40         struct uci_list *next, *prev;
  41
  42         next = ptr->next;
  43         prev = ptr->prev;
  44
  45         prev->next = next;
  46         next->prev = prev;
  47
  48         uci_list_init(ptr);
  49 }
  50
  51 /*
  52  * uci_alloc_generic allocates a new uci_element with payload
  53  * payload is appended to the struct to save memory and reduce fragmentation
  54  */
  55 static struct uci_element *
  56 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
  57 {
  58         struct uci_element *e;
  59         int datalen = size;
  60         void *ptr;
  61
  62         ptr = uci_malloc(ctx, datalen);
  63         e = (struct uci_element *) ptr;
  64         e->type = type;
  65         if (name) {
  66                 UCI_TRAP_SAVE(ctx, error);
  67                 e->name = uci_strdup(ctx, name);
  68                 UCI_TRAP_RESTORE(ctx);
  69         }
  70         uci_list_init(&e->list);
  71         goto done;
  72
  73 error:
  74         free(ptr);
  75         UCI_THROW(ctx, ctx->err);
  76
  77 done:
  78         return e;
  79 }
  80
  81 static void
  82 uci_free_element(struct uci_element *e)
  83 {
  84         if (e->name)
  85                 free(e->name);
  86         if (!uci_list_empty(&e->list))
  87                 uci_list_del(&e->list);
  88         free(e);
  89 }
  90
  91 static struct uci_option *
  92 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
  93 {
  94         struct uci_package *p = s->package;
  95         struct uci_context *ctx = p->ctx;
  96         struct uci_option *o;
  97
  98         o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
  99         o->type = UCI_TYPE_STRING;
 100         o->v.string = uci_dataptr(o);
 101         o->section = s;
 102         strcpy(o->v.string, value);
 103         uci_list_add(&s->options, &o->e.list);
 104
 105         return o;
 106 }
 107
 108 static inline void
 109 uci_free_option(struct uci_option *o)
 110 {
 111         struct uci_element *e, *tmp;
 112
 113         switch(o->type) {
 114         case UCI_TYPE_STRING:
 115                 if ((o->v.string != uci_dataptr(o)) &&
 116                         (o->v.string != NULL))
 117                         free(o->v.string);
 118                 break;
 119         case UCI_TYPE_LIST:
 120                 uci_foreach_element_safe(&o->v.list, tmp, e) {
 121                         uci_free_element(e);
 122                 }
 123                 break;
 124         default:
 125                 break;
 126         }
 127         uci_free_element(&o->e);
 128 }
 129
 130 static struct uci_option *
 131 uci_alloc_list(struct uci_section *s, const char *name)
 132 {
 133         struct uci_package *p = s->package;
 134         struct uci_context *ctx = p->ctx;
 135         struct uci_option *o;
 136
 137         o = uci_alloc_element(ctx, option, name, 0);
 138         o->type = UCI_TYPE_LIST;
 139         o->section = s;
 140         uci_list_init(&o->v.list);
 141         uci_list_add(&s->options, &o->e.list);
 142
 143         return o;
 144 }
 145
 146 /* fix up an unnamed section, e.g. after adding options to it */
 147 static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
 148 {
 149         unsigned int hash = ~0;
 150         struct uci_element *e;
 151         char buf[16];
 152
 153         if (!s || s->e.name)
 154                 return;
 155
 156         /*
 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.
 164          */
 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);
 170                 switch(o->type) {
 171                 case UCI_TYPE_STRING:
 172                         hash = djbhash(hash, o->v.string);
 173                         break;
 174                 default:
 175                         break;
 176                 }
 177         }
 178         sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
 179         s->e.name = uci_strdup(ctx, buf);
 180 }
 181
 182 static struct uci_section *
 183 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
 184 {
 185         struct uci_context *ctx = p->ctx;
 186         struct uci_section *s;
 187
 188         if (name && !name[0])
 189                 name = NULL;
 190
 191         s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
 192         uci_list_init(&s->options);
 193         s->type = uci_dataptr(s);
 194         s->package = p;
 195         strcpy(s->type, type);
 196         if (name == NULL)
 197                 s->anonymous = true;
 198         p->n_section++;
 199
 200         uci_list_add(&p->sections, &s->e.list);
 201
 202         return s;
 203 }
 204
 205 static void
 206 uci_free_section(struct uci_section *s)
 207 {
 208         struct uci_element *o, *tmp;
 209
 210         uci_foreach_element_safe(&s->options, tmp, o) {
 211                 uci_free_option(uci_to_option(o));
 212         }
 213         if ((s->type != uci_dataptr(s)) &&
 214                 (s->type != NULL))
 215                 free(s->type);
 216         uci_free_element(&s->e);
 217 }
 218
 219 __plugin struct uci_package *
 220 uci_alloc_package(struct uci_context *ctx, const char *name)
 221 {
 222         struct uci_package *p;
 223
 224         p = uci_alloc_element(ctx, package, name, 0);
 225         p->ctx = ctx;
 226         uci_list_init(&p->sections);
 227         uci_list_init(&p->history);
 228         uci_list_init(&p->saved_history);
 229         return p;
 230 }
 231
 232 static void
 233 uci_free_package(struct uci_package **package)
 234 {
 235         struct uci_element *e, *tmp;
 236         struct uci_package *p = *package;
 237
 238         if(!p)
 239                 return;
 240
 241         if (p->path)
 242                 free(p->path);
 243         uci_foreach_element_safe(&p->sections, tmp, e) {
 244                 uci_free_section(uci_to_section(e));
 245         }
 246         uci_foreach_element_safe(&p->history, tmp, e) {
 247                 uci_free_history(uci_to_history(e));
 248         }
 249         uci_foreach_element_safe(&p->saved_history, tmp, e) {
 250                 uci_free_history(uci_to_history(e));
 251         }
 252         uci_free_element(&p->e);
 253         *package = NULL;
 254 }
 255
 256 static struct uci_element *uci_lookup_list(struct uci_list *list, const char *name)
 257 {
 258         struct uci_element *e;
 259
 260         uci_foreach_element(list, e) {
 261                 if (!strcmp(e->name, name))
 262                         return e;
 263         }
 264         return NULL;
 265 }
 266
 267 int uci_lookup_ext(struct uci_context *ctx, struct uci_element **res, char *ptr)
 268 {
 269         struct uci_package *p = NULL;
 270         struct uci_element *e;
 271         struct uci_section *s;
 272         char *package = NULL;
 273         char *section = NULL;
 274         char *option = NULL;
 275         char *idxstr, *t;
 276         int idx, c;
 277
 278         UCI_HANDLE_ERR(ctx);
 279         UCI_ASSERT(ctx, res != NULL);
 280         UCI_ASSERT(ctx, ptr != NULL);
 281
 282         UCI_INTERNAL(uci_parse_tuple, ctx, ptr, &package, &section, &option, NULL);
 283
 284         /* look up the package first */
 285         e = uci_lookup_list(&ctx->root, package);
 286         if (!e) {
 287                 UCI_INTERNAL(uci_load, ctx, package, &p);
 288                 if (!p)
 289                         goto notfound;
 290                 e = &p->e;
 291         } else {
 292                 p = uci_to_package(e);
 293         }
 294
 295         if (!section)
 296                 goto done;
 297
 298         /* if the section name validates as a regular name, pass through
 299          * to the regular uci_lookup function call */
 300         if (!*section || uci_validate_name(section)) {
 301                 UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
 302                 goto done;
 303         }
 304
 305         /* name did not validate, that means we have an extended lookup call
 306          * parse it here. for now only the section index syntax is supported */
 307         if (section[0] != '@')
 308                 goto error;
 309
 310         section++;
 311
 312         /* parse the section index part */
 313         idxstr = strchr(section, '[');
 314         if (!idxstr)
 315                 goto error;
 316         *idxstr = 0;
 317         idxstr++;
 318
 319         t = strchr(idxstr, ']');
 320         if (!t)
 321                 goto error;
 322         if (t[1] != 0)
 323                 goto error;
 324         *t = 0;
 325
 326         t = NULL;
 327         idx = strtol(idxstr, &t, 10);
 328         if (t && *t)
 329                 goto error;
 330
 331         if (!*section)
 332                 section = NULL;
 333         if (section && !uci_validate_str(section, false))
 334                 goto error;
 335
 336         /* if the given index is negative, it specifies the section number from
 337          * the end of the list */
 338         if (idx < 0) {
 339                 c = 0;
 340                 uci_foreach_element(&p->sections, e) {
 341                         s = uci_to_section(e);
 342                         if (section && (strcmp(s->type, section) != 0))
 343                                 continue;
 344
 345                         c++;
 346                 }
 347                 idx += c;
 348         }
 349
 350         c = 0;
 351         uci_foreach_element(&p->sections, e) {
 352                 s = uci_to_section(e);
 353                 if (section && (strcmp(s->type, section) != 0))
 354                         continue;
 355
 356                 if (idx == c)
 357                         goto found;
 358                 c++;
 359         }
 360         goto notfound;
 361
 362 found:
 363         if (option)
 364                 e = uci_lookup_list(&s->options, option);
 365 done:
 366         *res = e;
 367         return 0;
 368
 369 notfound:
 370         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 371 error:
 372         UCI_THROW(ctx, UCI_ERR_INVAL);
 373         return 0;
 374 }
 375
 376 int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *p, const char *section, const char *option)
 377 {
 378         struct uci_element *e;
 379         struct uci_section *s;
 380
 381         UCI_HANDLE_ERR(ctx);
 382         UCI_ASSERT(ctx, res != NULL);
 383         UCI_ASSERT(ctx, p != NULL);
 384         UCI_ASSERT(ctx, section && uci_validate_name(section));
 385         if (option)
 386                 UCI_ASSERT(ctx, uci_validate_name(option));
 387
 388         e = uci_lookup_list(&p->sections, section);
 389         if (!e)
 390                 goto notfound;
 391
 392         if (option) {
 393                 s = uci_to_section(e);
 394                 e = uci_lookup_list(&s->options, option);
 395                 if (!e)
 396                         goto notfound;
 397         }
 398
 399         *res = e;
 400         return 0;
 401
 402 notfound:
 403         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 404         return 0;
 405 }
 406
 407 int uci_del_element(struct uci_context *ctx, struct uci_element *e)
 408 {
 409         /* NB: UCI_INTERNAL use means without history tracking */
 410         bool internal = ctx->internal;
 411         struct uci_package *p = NULL;
 412         struct uci_section *s = NULL;
 413         struct uci_option *o = NULL;
 414         struct uci_element *i, *tmp;
 415         char *option = NULL;
 416
 417         UCI_HANDLE_ERR(ctx);
 418         UCI_ASSERT(ctx, e != NULL);
 419
 420         switch(e->type) {
 421         case UCI_TYPE_SECTION:
 422                 s = uci_to_section(e);
 423                 uci_foreach_element_safe(&s->options, tmp, i) {
 424                         uci_del_element(ctx, i);
 425                 }
 426                 break;
 427         case UCI_TYPE_OPTION:
 428                 o = uci_to_option(e);
 429                 s = o->section;
 430                 p = s->package;
 431                 option = e->name;
 432                 break;
 433         default:
 434                 UCI_THROW(ctx, UCI_ERR_INVAL);
 435                 break;
 436         }
 437
 438         p = s->package;
 439         if (!internal && p->has_history)
 440                 uci_add_history(ctx, &p->history, UCI_CMD_REMOVE, s->e.name, option, NULL);
 441
 442         switch(e->type) {
 443         case UCI_TYPE_SECTION:
 444                 uci_free_section(s);
 445                 break;
 446         case UCI_TYPE_OPTION:
 447                 uci_free_option(o);
 448                 break;
 449         default:
 450                 break;
 451         }
 452
 453         return 0;
 454 }
 455
 456 int uci_add_element_list(struct uci_context *ctx, struct uci_option *o, const char *value)
 457 {
 458         struct uci_element *e;
 459         struct uci_package *p;
 460         struct uci_section *s;
 461         bool internal = ctx->internal;
 462
 463         UCI_HANDLE_ERR(ctx);
 464         UCI_ASSERT(ctx, (o != NULL) && (o->type == UCI_TYPE_LIST) && uci_validate_text(value));
 465
 466         s = o->section;
 467         p = s->package;
 468
 469         if (!internal && p->has_history)
 470                 uci_add_history(ctx, &p->history, UCI_CMD_LIST_ADD, s->e.name, o->e.name, value);
 471
 472         e = uci_alloc_generic(ctx, UCI_TYPE_ITEM, value, sizeof(struct uci_option));
 473         uci_list_add(&o->v.list, &e->list);
 474
 475         return 0;
 476 }
 477
 478 int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, const char *value)
 479 {
 480         /* NB: UCI_INTERNAL use means without history tracking */
 481         bool internal = ctx->internal;
 482         struct uci_list *list;
 483         struct uci_element *e;
 484         struct uci_package *p;
 485         struct uci_section *s;
 486         struct uci_option *o;
 487         char *section;
 488         char *option;
 489         char *str;
 490         int size = 0;
 491
 492         UCI_HANDLE_ERR(ctx);
 493         UCI_ASSERT(ctx, (element != NULL) && (*element != NULL));
 494
 495         /* what the 'value' of an element means depends on the type
 496          * for a section, the 'value' means its type
 497          * for an option, the 'value' means its value string
 498          * when changing the value, shrink the element to its actual size
 499          * (it may have been allocated with a bigger size, to include
 500          *  its buffer)
 501          * then duplicate the string passed on the command line and
 502          * insert it into the structure.
 503          */
 504         e = *element;
 505         list = e->list.prev;
 506
 507         switch(e->type) {
 508         case UCI_TYPE_SECTION:
 509                 UCI_ASSERT(ctx, uci_validate_str(value, false));
 510                 size = sizeof(struct uci_section);
 511                 s = uci_to_section(e);
 512                 section = e->name;
 513                 option = NULL;
 514                 /* matches the currently set value */
 515                 if (!strcmp(value, s->type))
 516                         return 0;
 517                 break;
 518
 519         case UCI_TYPE_OPTION:
 520                 UCI_ASSERT(ctx, value != NULL);
 521                 o = uci_to_option(e);
 522                 s = o->section;
 523                 section = s->e.name;
 524                 option = o->e.name;
 525                 switch(o->type) {
 526                 case UCI_TYPE_STRING:
 527                         size = sizeof(struct uci_option);
 528                         /* matches the currently set value */
 529                         if (!strcmp(value, o->v.string))
 530                                 return 0;
 531                         break;
 532                 default:
 533                         /* default action for non-string datatypes is to delete
 534                          * the existing entry, then re-create it as a string */
 535                         break;
 536                 }
 537                 break;
 538
 539         default:
 540                 UCI_THROW(ctx, UCI_ERR_INVAL);
 541                 return 0;
 542         }
 543         p = s->package;
 544         if (!internal && p->has_history)
 545                 uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
 546
 547         if ((e->type == UCI_TYPE_OPTION) && (size == 0)) {
 548                 o = uci_alloc_option(s, option, value);
 549                 UCI_INTERNAL(uci_del_element, ctx, e);
 550                 *element = &o->e;
 551                 goto done;
 552         }
 553
 554         uci_list_del(&e->list);
 555         e = uci_realloc(ctx, e, size);
 556         str = uci_strdup(ctx, value);
 557         uci_list_insert(list, &e->list);
 558         *element = e;
 559
 560         switch(e->type) {
 561         case UCI_TYPE_SECTION:
 562                 uci_to_section(e)->type = str;
 563                 break;
 564         case UCI_TYPE_OPTION:
 565                 uci_to_option(e)->v.string = str;
 566                 break;
 567         default:
 568                 break;
 569         }
 570
 571 done:
 572         return 0;
 573 }
 574
 575 int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *name)
 576 {
 577         /* NB: UCI_INTERNAL use means without history tracking */
 578         bool internal = ctx->internal;
 579         struct uci_element *e;
 580
 581         UCI_HANDLE_ERR(ctx);
 582
 583         /* NB: p, section, option validated by uci_lookup */
 584         UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
 585
 586         if (!internal && p->has_history)
 587                 uci_add_history(ctx, &p->history, UCI_CMD_RENAME, section, option, name);
 588
 589         name = uci_strdup(ctx, name);
 590         if (e->name)
 591                 free(e->name);
 592         e->name = name;
 593
 594         return 0;
 595 }
 596
 597 int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res)
 598 {
 599         bool internal = ctx->internal;
 600         struct uci_section *s;
 601
 602         UCI_HANDLE_ERR(ctx);
 603         UCI_ASSERT(ctx, p != NULL);
 604         s = uci_alloc_section(p, type, NULL);
 605         uci_fixup_section(ctx, s);
 606         *res = s;
 607         if (!internal && p->has_history)
 608                 uci_add_history(ctx, &p->history, UCI_CMD_ADD, s->e.name, NULL, type);
 609
 610         return 0;
 611 }
 612
 613 int uci_delete(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option)
 614 {
 615         /* NB: pass on internal flag to uci_del_element */
 616         bool internal = ctx->internal;
 617         struct uci_element *e;
 618
 619         UCI_HANDLE_ERR(ctx);
 620
 621         /* NB: p, section, option validated by uci_lookup */
 622         UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
 623
 624         ctx->internal = internal;
 625         return uci_del_element(ctx, e);
 626 }
 627
 628 int uci_add_list(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_option **result)
 629 {
 630         /* NB: UCI_INTERNAL use means without history tracking */
 631         bool internal = ctx->internal;
 632         struct uci_element *e;
 633         struct uci_section *s;
 634         struct uci_option *o;
 635         struct uci_option *prev = NULL;
 636         const char *value2 = NULL;
 637
 638         UCI_HANDLE_ERR(ctx);
 639         UCI_ASSERT(ctx, p && section && option && value && uci_validate_text(value));
 640
 641         /* look up the section first */
 642         UCI_INTERNAL(uci_lookup, ctx, &e, p, section, NULL);
 643         s = uci_to_section(e);
 644
 645         e = uci_lookup_list(&s->options, option);
 646         if (e) {
 647                 o = uci_to_option(e);
 648                 switch (o->type) {
 649                 case UCI_TYPE_STRING:
 650                         /* we already have a string value, let's convert that to a list */
 651                         prev = o;
 652                         value2 = value;
 653                         value = o->v.string;
 654                         break;
 655                 case UCI_TYPE_LIST:
 656                         if (result)
 657                                 *result = o;
 658
 659                         ctx->internal = internal;
 660                         return uci_add_element_list(ctx, o, value);
 661                 default:
 662                         UCI_THROW(ctx, UCI_ERR_INVAL);
 663                         break;
 664                 }
 665         }
 666
 667         o = uci_alloc_list(s, option);
 668         if (result)
 669                 *result = o;
 670         if (prev) {
 671                 UCI_INTERNAL(uci_add_element_list, ctx, o, value);
 672                 uci_free_option(prev);
 673                 value = value2;
 674         }
 675
 676         ctx->internal = internal;
 677         return uci_add_element_list(ctx, o, value);
 678 }
 679
 680 int uci_set(struct uci_context *ctx, struct uci_package *p, const char *section, const char *option, const char *value, struct uci_element **result)
 681 {
 682         /* NB: UCI_INTERNAL use means without history tracking */
 683         bool internal = ctx->internal;
 684         struct uci_element *e = NULL;
 685         struct uci_section *s = NULL;
 686         struct uci_option *o = NULL;
 687
 688         UCI_HANDLE_ERR(ctx);
 689         UCI_ASSERT(ctx, p != NULL);
 690         UCI_ASSERT(ctx, uci_validate_name(section));
 691         if (option) {
 692                 UCI_ASSERT(ctx, uci_validate_name(option));
 693                 UCI_ASSERT(ctx, value != NULL);
 694         } else {
 695                 UCI_ASSERT(ctx, uci_validate_str(value, false));
 696         }
 697
 698         /*
 699          * look up the package, section and option (if set)
 700          * if the section/option is to be modified and it is not found
 701          * create a new element in the appropriate list
 702          */
 703         e = uci_lookup_list(&p->sections, section);
 704         if (!e)
 705                 goto notfound;
 706
 707         s = uci_to_section(e);
 708         if (ctx->pctx && ctx->pctx->merge)
 709                 ctx->pctx->section = s;
 710
 711         if (option) {
 712                 e = uci_lookup_list(&s->options, option);
 713                 if (!e)
 714                         goto notfound;
 715                 o = uci_to_option(e);
 716         }
 717
 718         /*
 719          * no unknown element was supplied, assume that we can just update
 720          * an existing entry
 721          */
 722         if (o)
 723                 e = &o->e;
 724         else
 725                 e = &s->e;
 726         if (result)
 727                 *result = e;
 728         else
 729                 result = &e;
 730
 731         ctx->internal = internal;
 732         return uci_set_element_value(ctx, result, value);
 733
 734 notfound:
 735         /*
 736          * the entry that we need to update was not found,
 737          * check if the search failed prematurely.
 738          * this can happen if the package was not found, or if
 739          * an option was supplied, but the section wasn't found
 740          */
 741         if (!p || (!s && option))
 742                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 743
 744         /* now add the missing entry */
 745         if (!internal && p->has_history)
 746                 uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
 747         if (s) {
 748                 o = uci_alloc_option(s, option, value);
 749                 if (result)
 750                         *result = &o->e;
 751         } else {
 752                 s = uci_alloc_section(p, value, section);
 753                 if (result)
 754                         *result = &s->e;
 755                 if (ctx->pctx && ctx->pctx->merge)
 756                         ctx->pctx->section = s;
 757         }
 758
 759         return 0;
 760 }
 761
 762 int uci_unload(struct uci_context *ctx, struct uci_package *p)
 763 {
 764         UCI_HANDLE_ERR(ctx);
 765         UCI_ASSERT(ctx, p != NULL);
 766
 767         uci_free_package(&p);
 768         return 0;
 769 }
 770