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 Lesser General Public License for more details.
  13  */
  14
  15 static void uci_list_set_pos(struct uci_list *head, struct uci_list *ptr, int pos)
  16 {
  17         struct uci_list *new_head = head;
  18         struct uci_element *p = NULL;
  19
  20         uci_list_del(ptr);
  21         uci_foreach_element(head, p) {
  22                 if (pos-- <= 0)
  23                         break;
  24                 new_head = &p->list;
  25         }
  26
  27         uci_list_add(new_head->next, ptr);
  28 }
  29
  30 static inline void uci_list_fixup(struct uci_list *ptr)
  31 {
  32         ptr->prev->next = ptr;
  33         ptr->next->prev = ptr;
  34 }
  35
  36 /*
  37  * uci_alloc_generic allocates a new uci_element with payload
  38  * payload is appended to the struct to save memory and reduce fragmentation
  39  */
  40 __private struct uci_element *
  41 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
  42 {
  43         struct uci_element *e;
  44         int datalen = size;
  45         void *ptr;
  46
  47         ptr = uci_malloc(ctx, datalen);
  48         e = (struct uci_element *) ptr;
  49         e->type = type;
  50         if (name) {
  51                 UCI_TRAP_SAVE(ctx, error);
  52                 e->name = uci_strdup(ctx, name);
  53                 UCI_TRAP_RESTORE(ctx);
  54         }
  55         uci_list_init(&e->list);
  56         goto done;
  57
  58 error:
  59         free(ptr);
  60         UCI_THROW(ctx, ctx->err);
  61
  62 done:
  63         return e;
  64 }
  65
  66 __private void
  67 uci_free_element(struct uci_element *e)
  68 {
  69         if (e->name)
  70                 free(e->name);
  71         if (!uci_list_empty(&e->list))
  72                 uci_list_del(&e->list);
  73         free(e);
  74 }
  75
  76 static struct uci_option *
  77 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
  78 {
  79         struct uci_package *p = s->package;
  80         struct uci_context *ctx = p->ctx;
  81         struct uci_option *o;
  82
  83         o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
  84         o->type = UCI_TYPE_STRING;
  85         o->v.string = uci_dataptr(o);
  86         o->section = s;
  87         strcpy(o->v.string, value);
  88         uci_list_add(&s->options, &o->e.list);
  89
  90         return o;
  91 }
  92
  93 static inline void
  94 uci_free_option(struct uci_option *o)
  95 {
  96         struct uci_element *e, *tmp;
  97
  98         switch(o->type) {
  99         case UCI_TYPE_STRING:
 100                 if ((o->v.string != uci_dataptr(o)) &&
 101                         (o->v.string != NULL))
 102                         free(o->v.string);
 103                 break;
 104         case UCI_TYPE_LIST:
 105                 uci_foreach_element_safe(&o->v.list, tmp, e) {
 106                         uci_free_element(e);
 107                 }
 108                 break;
 109         default:
 110                 break;
 111         }
 112         uci_free_element(&o->e);
 113 }
 114
 115 static struct uci_option *
 116 uci_alloc_list(struct uci_section *s, const char *name)
 117 {
 118         struct uci_package *p = s->package;
 119         struct uci_context *ctx = p->ctx;
 120         struct uci_option *o;
 121
 122         o = uci_alloc_element(ctx, option, name, 0);
 123         o->type = UCI_TYPE_LIST;
 124         o->section = s;
 125         uci_list_init(&o->v.list);
 126         uci_list_add(&s->options, &o->e.list);
 127
 128         return o;
 129 }
 130
 131 /* Based on an efficient hash function published by D. J. Bernstein */
 132 static unsigned int djbhash(unsigned int hash, char *str)
 133 {
 134         int len = strlen(str);
 135         int i;
 136
 137         /* initial value */
 138         if (hash == ~0)
 139                 hash = 5381;
 140
 141         for(i = 0; i < len; i++) {
 142                 hash = ((hash << 5) + hash) + str[i];
 143         }
 144         return (hash & 0x7FFFFFFF);
 145 }
 146
 147 /* fix up an unnamed section, e.g. after adding options to it */
 148 __private void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
 149 {
 150         unsigned int hash = ~0;
 151         struct uci_element *e;
 152         char buf[16];
 153
 154         if (!s || s->e.name)
 155                 return;
 156
 157         /*
 158          * Generate a name for unnamed sections. This is used as reference
 159          * when locating or updating the section from apps/scripts.
 160          * To make multiple concurrent versions somewhat safe for updating,
 161          * the name is generated from a hash of its type and name/value
 162          * pairs of its option, and it is prefixed by a counter value.
 163          * If the order of the unnamed sections changes for some reason,
 164          * updates to them will be rejected.
 165          */
 166         hash = djbhash(hash, s->type);
 167         uci_foreach_element(&s->options, e) {
 168                 struct uci_option *o;
 169                 hash = djbhash(hash, e->name);
 170                 o = uci_to_option(e);
 171                 switch(o->type) {
 172                 case UCI_TYPE_STRING:
 173                         hash = djbhash(hash, o->v.string);
 174                         break;
 175                 default:
 176                         break;
 177                 }
 178         }
 179         sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
 180         s->e.name = uci_strdup(ctx, buf);
 181 }
 182
 183 static struct uci_section *
 184 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
 185 {
 186         struct uci_context *ctx = p->ctx;
 187         struct uci_section *s;
 188
 189         if (name && !name[0])
 190                 name = NULL;
 191
 192         s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
 193         uci_list_init(&s->options);
 194         s->type = uci_dataptr(s);
 195         s->package = p;
 196         strcpy(s->type, type);
 197         if (name == NULL)
 198                 s->anonymous = true;
 199         p->n_section++;
 200
 201         uci_list_add(&p->sections, &s->e.list);
 202
 203         return s;
 204 }
 205
 206 static void
 207 uci_free_section(struct uci_section *s)
 208 {
 209         struct uci_element *o, *tmp;
 210
 211         uci_foreach_element_safe(&s->options, tmp, o) {
 212                 uci_free_option(uci_to_option(o));
 213         }
 214         if ((s->type != uci_dataptr(s)) &&
 215                 (s->type != NULL))
 216                 free(s->type);
 217         uci_free_element(&s->e);
 218 }
 219
 220 __private struct uci_package *
 221 uci_alloc_package(struct uci_context *ctx, const char *name)
 222 {
 223         struct uci_package *p;
 224
 225         p = uci_alloc_element(ctx, package, name, 0);
 226         p->ctx = ctx;
 227         uci_list_init(&p->sections);
 228         uci_list_init(&p->delta);
 229         uci_list_init(&p->saved_delta);
 230         return p;
 231 }
 232
 233 __private void
 234 uci_free_package(struct uci_package **package)
 235 {
 236         struct uci_element *e, *tmp;
 237         struct uci_package *p = *package;
 238
 239         if(!p)
 240                 return;
 241
 242         if (p->path)
 243                 free(p->path);
 244         uci_foreach_element_safe(&p->sections, tmp, e) {
 245                 uci_free_section(uci_to_section(e));
 246         }
 247         uci_foreach_element_safe(&p->delta, tmp, e) {
 248                 uci_free_delta(uci_to_delta(e));
 249         }
 250         uci_foreach_element_safe(&p->saved_delta, tmp, e) {
 251                 uci_free_delta(uci_to_delta(e));
 252         }
 253         uci_free_element(&p->e);
 254         *package = NULL;
 255 }
 256
 257 static void
 258 uci_free_any(struct uci_element **e)
 259 {
 260         switch((*e)->type) {
 261         case UCI_TYPE_SECTION:
 262                 uci_free_section(uci_to_section(*e));
 263                 break;
 264         case UCI_TYPE_OPTION:
 265                 uci_free_option(uci_to_option(*e));
 266                 break;
 267         default:
 268                 break;
 269         }
 270         *e = NULL;
 271 }
 272
 273 __private struct uci_element *
 274 uci_lookup_list(struct uci_list *list, const char *name)
 275 {
 276         struct uci_element *e;
 277
 278         uci_foreach_element(list, e) {
 279                 if (!strcmp(e->name, name))
 280                         return e;
 281         }
 282         return NULL;
 283 }
 284
 285 static struct uci_element *
 286 uci_lookup_ext_section(struct uci_context *ctx, struct uci_ptr *ptr)
 287 {
 288         char *idxstr, *t, *section, *name;
 289         struct uci_element *e = NULL;
 290         struct uci_section *s;
 291         int idx, c;
 292
 293         section = uci_strdup(ctx, ptr->section);
 294         name = idxstr = section + 1;
 295
 296         if (section[0] != '@')
 297                 goto error;
 298
 299         /* parse the section index part */
 300         idxstr = strchr(idxstr, '[');
 301         if (!idxstr)
 302                 goto error;
 303         *idxstr = 0;
 304         idxstr++;
 305
 306         t = strchr(idxstr, ']');
 307         if (!t)
 308                 goto error;
 309         if (t[1] != 0)
 310                 goto error;
 311         *t = 0;
 312
 313         t = NULL;
 314         idx = strtol(idxstr, &t, 10);
 315         if (t && *t)
 316                 goto error;
 317
 318         if (!*name)
 319                 name = NULL;
 320         else if (!uci_validate_type(name))
 321                 goto error;
 322
 323         /* if the given index is negative, it specifies the section number from
 324          * the end of the list */
 325         if (idx < 0) {
 326                 c = 0;
 327                 uci_foreach_element(&ptr->p->sections, e) {
 328                         s = uci_to_section(e);
 329                         if (name && (strcmp(s->type, name) != 0))
 330                                 continue;
 331
 332                         c++;
 333                 }
 334                 idx += c;
 335         }
 336
 337         c = 0;
 338         uci_foreach_element(&ptr->p->sections, e) {
 339                 s = uci_to_section(e);
 340                 if (name && (strcmp(s->type, name) != 0))
 341                         continue;
 342
 343                 if (idx == c)
 344                         goto done;
 345                 c++;
 346         }
 347         e = NULL;
 348         goto done;
 349
 350 error:
 351         e = NULL;
 352         memset(ptr, 0, sizeof(struct uci_ptr));
 353         UCI_THROW(ctx, UCI_ERR_INVAL);
 354 done:
 355         free(section);
 356         if (e)
 357                 ptr->section = e->name;
 358         return e;
 359 }
 360
 361 int
 362 uci_lookup_next(struct uci_context *ctx, struct uci_element **e, struct uci_list *list, const char *name)
 363 {
 364         UCI_HANDLE_ERR(ctx);
 365
 366         *e = uci_lookup_list(list, name);
 367         if (!*e)
 368                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 369
 370         return 0;
 371 }
 372
 373 int
 374 uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended)
 375 {
 376         struct uci_element *e;
 377
 378         UCI_HANDLE_ERR(ctx);
 379         UCI_ASSERT(ctx, ptr != NULL);
 380
 381         if (str)
 382                 UCI_INTERNAL(uci_parse_ptr, ctx, ptr, str);
 383
 384         ptr->flags |= UCI_LOOKUP_DONE;
 385
 386         /* look up the package first */
 387         if (ptr->p)
 388                 e = &ptr->p->e;
 389         else
 390                 e = uci_lookup_list(&ctx->root, ptr->package);
 391
 392         if (!e) {
 393                 UCI_INTERNAL(uci_load, ctx, ptr->package, &ptr->p);
 394                 if (!ptr->p)
 395                         goto notfound;
 396                 ptr->last = &ptr->p->e;
 397         } else {
 398                 ptr->p = uci_to_package(e);
 399                 ptr->last = e;
 400         }
 401
 402         if (!ptr->section && !ptr->s)
 403                 goto complete;
 404
 405         /* if the section name validates as a regular name, pass through
 406          * to the regular uci_lookup function call */
 407         if (ptr->s) {
 408                 e = &ptr->s->e;
 409         } else if (ptr->flags & UCI_LOOKUP_EXTENDED) {
 410                 if (extended)
 411                         e = uci_lookup_ext_section(ctx, ptr);
 412                 else
 413                         UCI_THROW(ctx, UCI_ERR_INVAL);
 414         } else {
 415                 e = uci_lookup_list(&ptr->p->sections, ptr->section);
 416         }
 417
 418         if (!e)
 419                 goto abort;
 420
 421         ptr->last = e;
 422         ptr->s = uci_to_section(e);
 423
 424         if (ptr->option) {
 425                 e = uci_lookup_list(&ptr->s->options, ptr->option);
 426                 if (!e)
 427                         goto abort;
 428
 429                 ptr->o = uci_to_option(e);
 430                 ptr->last = e;
 431         }
 432
 433 complete:
 434         ptr->flags |= UCI_LOOKUP_COMPLETE;
 435 abort:
 436         return 0;
 437
 438 notfound:
 439         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 440         return 0;
 441 }
 442
 443 __private struct uci_element *
 444 uci_expand_ptr(struct uci_context *ctx, struct uci_ptr *ptr, bool complete)
 445 {
 446         UCI_ASSERT(ctx, ptr != NULL);
 447
 448         if (!(ptr->flags & UCI_LOOKUP_DONE))
 449                 UCI_INTERNAL(uci_lookup_ptr, ctx, ptr, NULL, 1);
 450         if (complete && !(ptr->flags & UCI_LOOKUP_COMPLETE))
 451                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 452         UCI_ASSERT(ctx, ptr->p != NULL);
 453
 454         /* fill in missing string info */
 455         if (ptr->p && !ptr->package)
 456                 ptr->package = ptr->p->e.name;
 457         if (ptr->s && !ptr->section)
 458                 ptr->section = ptr->s->e.name;
 459         if (ptr->o && !ptr->option)
 460                 ptr->option = ptr->o->e.name;
 461
 462         if (ptr->o)
 463                 return &ptr->o->e;
 464         if (ptr->s)
 465                 return &ptr->s->e;
 466         if (ptr->p)
 467                 return &ptr->p->e;
 468         else
 469                 return NULL;
 470 }
 471
 472 static void uci_add_element_list(struct uci_context *ctx, struct uci_ptr *ptr, bool internal)
 473 {
 474         struct uci_element *e;
 475         struct uci_package *p;
 476
 477         p = ptr->p;
 478         if (!internal && p->has_delta)
 479                 uci_add_delta(ctx, &p->delta, UCI_CMD_LIST_ADD, ptr->section, ptr->option, ptr->value);
 480
 481         e = uci_alloc_generic(ctx, UCI_TYPE_ITEM, ptr->value, sizeof(struct uci_option));
 482         uci_list_add(&ptr->o->v.list, &e->list);
 483 }
 484
 485 int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr)
 486 {
 487         /* NB: UCI_INTERNAL use means without delta tracking */
 488         bool internal = ctx && ctx->internal;
 489         struct uci_element *e;
 490         struct uci_package *p;
 491         char *n;
 492
 493         UCI_HANDLE_ERR(ctx);
 494
 495         e = uci_expand_ptr(ctx, ptr, true);
 496         p = ptr->p;
 497
 498         UCI_ASSERT(ctx, ptr->s);
 499         UCI_ASSERT(ctx, ptr->value);
 500
 501         if (!internal && p->has_delta)
 502                 uci_add_delta(ctx, &p->delta, UCI_CMD_RENAME, ptr->section, ptr->option, ptr->value);
 503
 504         n = uci_strdup(ctx, ptr->value);
 505         if (e->name)
 506                 free(e->name);
 507         e->name = n;
 508
 509         if (e->type == UCI_TYPE_SECTION)
 510                 uci_to_section(e)->anonymous = false;
 511
 512         return 0;
 513 }
 514
 515 int uci_reorder_section(struct uci_context *ctx, struct uci_section *s, int pos)
 516 {
 517         struct uci_package *p = s->package;
 518         char order[32];
 519
 520         UCI_HANDLE_ERR(ctx);
 521
 522         uci_list_set_pos(&s->package->sections, &s->e.list, pos);
 523         if (!ctx->internal && p->has_delta) {
 524                 sprintf(order, "%d", pos);
 525                 uci_add_delta(ctx, &p->delta, UCI_CMD_REORDER, s->e.name, NULL, order);
 526         }
 527
 528         return 0;
 529 }
 530
 531 int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res)
 532 {
 533         bool internal = ctx && ctx->internal;
 534         struct uci_section *s;
 535
 536         UCI_HANDLE_ERR(ctx);
 537         UCI_ASSERT(ctx, p != NULL);
 538         s = uci_alloc_section(p, type, NULL);
 539         uci_fixup_section(ctx, s);
 540         *res = s;
 541         if (!internal && p->has_delta)
 542                 uci_add_delta(ctx, &p->delta, UCI_CMD_ADD, s->e.name, NULL, type);
 543
 544         return 0;
 545 }
 546
 547 int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr)
 548 {
 549         /* NB: pass on internal flag to uci_del_element */
 550         bool internal = ctx && ctx->internal;
 551         struct uci_package *p;
 552         struct uci_element *e1, *e2, *tmp;
 553         int index;
 554
 555         UCI_HANDLE_ERR(ctx);
 556
 557         e1 = uci_expand_ptr(ctx, ptr, true);
 558         p = ptr->p;
 559
 560         UCI_ASSERT(ctx, ptr->s);
 561
 562         if (ptr->value && *ptr->value && ptr->o && ptr->o->type == UCI_TYPE_LIST) {
 563                 if (!sscanf(ptr->value, "%d", &index))
 564                         return 1;
 565
 566                 uci_foreach_element_safe(&ptr->o->v.list, tmp, e2) {
 567                         if (index == 0) {
 568                                 if (!internal && p->has_delta)
 569                                         uci_add_delta(ctx, &p->delta, UCI_CMD_REMOVE, ptr->section, ptr->option, ptr->value);
 570                                 uci_free_option(uci_to_option(e2));
 571                                 return 0;
 572                         }
 573                         index--;
 574                 }
 575
 576                 return 0;
 577         }
 578
 579         if (!internal && p->has_delta)
 580                 uci_add_delta(ctx, &p->delta, UCI_CMD_REMOVE, ptr->section, ptr->option, NULL);
 581
 582         uci_free_any(&e1);
 583
 584         if (ptr->option)
 585                 ptr->o = NULL;
 586         else if (ptr->section)
 587                 ptr->s = NULL;
 588
 589         return 0;
 590 }
 591
 592 int uci_add_list(struct uci_context *ctx, struct uci_ptr *ptr)
 593 {
 594         /* NB: UCI_INTERNAL use means without delta tracking */
 595         bool internal = ctx && ctx->internal;
 596         struct uci_option *prev = NULL;
 597         const char *value2 = NULL;
 598
 599         UCI_HANDLE_ERR(ctx);
 600
 601         uci_expand_ptr(ctx, ptr, false);
 602         UCI_ASSERT(ctx, ptr->s);
 603         UCI_ASSERT(ctx, ptr->value);
 604
 605         if (ptr->o) {
 606                 switch (ptr->o->type) {
 607                 case UCI_TYPE_STRING:
 608                         /* we already have a string value, convert that to a list */
 609                         prev = ptr->o;
 610                         value2 = ptr->value;
 611                         ptr->value = ptr->o->v.string;
 612                         break;
 613                 case UCI_TYPE_LIST:
 614                         uci_add_element_list(ctx, ptr, internal);
 615                         return 0;
 616                 default:
 617                         UCI_THROW(ctx, UCI_ERR_INVAL);
 618                         break;
 619                 }
 620         }
 621
 622         ptr->o = uci_alloc_list(ptr->s, ptr->option);
 623         if (prev) {
 624                 uci_add_element_list(ctx, ptr, true);
 625                 uci_free_option(prev);
 626                 ptr->value = value2;
 627         }
 628         uci_add_element_list(ctx, ptr, internal);
 629
 630         return 0;
 631 }
 632
 633 int uci_del_list(struct uci_context *ctx, struct uci_ptr *ptr)
 634 {
 635         /* NB: pass on internal flag to uci_del_element */
 636         bool internal = ctx && ctx->internal;
 637         struct uci_element *e, *tmp;
 638         struct uci_package *p;
 639
 640         UCI_HANDLE_ERR(ctx);
 641
 642         uci_expand_ptr(ctx, ptr, false);
 643         UCI_ASSERT(ctx, ptr->s);
 644         UCI_ASSERT(ctx, ptr->value);
 645
 646         if (!(ptr->o && ptr->option))
 647                 return 0;
 648
 649         if ((ptr->o->type != UCI_TYPE_LIST))
 650                 return 0;
 651
 652         p = ptr->p;
 653         if (!internal && p->has_delta)
 654                 uci_add_delta(ctx, &p->delta, UCI_CMD_LIST_DEL, ptr->section, ptr->option, ptr->value);
 655
 656         uci_foreach_element_safe(&ptr->o->v.list, tmp, e) {
 657                 if (!strcmp(ptr->value, uci_to_option(e)->e.name)) {
 658                         uci_free_option(uci_to_option(e));
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664
 665 int uci_set(struct uci_context *ctx, struct uci_ptr *ptr)
 666 {
 667         /* NB: UCI_INTERNAL use means without delta tracking */
 668         bool internal = ctx && ctx->internal;
 669
 670         UCI_HANDLE_ERR(ctx);
 671         uci_expand_ptr(ctx, ptr, false);
 672         UCI_ASSERT(ctx, ptr->value);
 673         UCI_ASSERT(ctx, ptr->s || (!ptr->option && ptr->section));
 674         if (!ptr->option && ptr->value[0]) {
 675                 UCI_ASSERT(ctx, uci_validate_type(ptr->value));
 676         }
 677
 678         if (!ptr->o && ptr->s && ptr->option) {
 679                 struct uci_element *e;
 680                 e = uci_lookup_list(&ptr->s->options, ptr->option);
 681                 if (e)
 682                         ptr->o = uci_to_option(e);
 683         }
 684         if (!ptr->value[0]) {
 685                 /* if setting a nonexistant option/section to a nonexistant value,
 686                  * exit without errors */
 687                 if (!(ptr->flags & UCI_LOOKUP_COMPLETE))
 688                         return 0;
 689
 690                 return uci_delete(ctx, ptr);
 691         } else if (!ptr->o && ptr->option) { /* new option */
 692                 ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value);
 693                 ptr->last = &ptr->o->e;
 694         } else if (!ptr->s && ptr->section) { /* new section */
 695                 ptr->s = uci_alloc_section(ptr->p, ptr->value, ptr->section);
 696                 ptr->last = &ptr->s->e;
 697         } else if (ptr->o && ptr->option) { /* update option */
 698                 if ((ptr->o->type == UCI_TYPE_STRING) &&
 699                         !strcmp(ptr->o->v.string, ptr->value))
 700                         return 0;
 701                 uci_free_option(ptr->o);
 702                 ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value);
 703                 ptr->last = &ptr->o->e;
 704         } else if (ptr->s && ptr->section) { /* update section */
 705                 char *s = uci_strdup(ctx, ptr->value);
 706
 707                 if (ptr->s->type == uci_dataptr(ptr->s)) {
 708                         ptr->last = NULL;
 709                         ptr->last = uci_realloc(ctx, ptr->s, sizeof(struct uci_section));
 710                         ptr->s = uci_to_section(ptr->last);
 711                         uci_list_fixup(&ptr->s->e.list);
 712                 } else {
 713                         free(ptr->s->type);
 714                 }
 715                 ptr->s->type = s;
 716         } else {
 717                 UCI_THROW(ctx, UCI_ERR_INVAL);
 718         }
 719
 720         if (!internal && ptr->p->has_delta)
 721                 uci_add_delta(ctx, &ptr->p->delta, UCI_CMD_CHANGE, ptr->section, ptr->option, ptr->value);
 722
 723         return 0;
 724 }
 725
 726 int uci_unload(struct uci_context *ctx, struct uci_package *p)
 727 {
 728         UCI_HANDLE_ERR(ctx);
 729         UCI_ASSERT(ctx, p != NULL);
 730
 731         uci_free_package(&p);
 732         return 0;
 733 }
 734