ucimap.c

   1 /*
   2  * ucimap.c - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008-2009 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 /*
  16  * This file contains ucimap, an API for mapping UCI to C data structures
  17  */
  18
  19 #include <strings.h>
  20 #include <stdbool.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include "ucimap.h"
  29 #include "uci_internal.h"
  30
  31 struct ucimap_alloc {
  32         void *ptr;
  33 };
  34
  35 struct ucimap_alloc_custom {
  36         void *section;
  37         struct uci_optmap *om;
  38         void *ptr;
  39 };
  40
  41 struct ucimap_fixup {
  42         struct ucimap_fixup *next;
  43         struct uci_sectionmap *sm;
  44         const char *name;
  45         enum ucimap_type type;
  46         union ucimap_data *data;
  47 };
  48
  49 #define ucimap_foreach_option(_sm, _o) \
  50         if (!(_sm)->options_size) \
  51                 (_sm)->options_size = sizeof(struct uci_optmap); \
  52         for (_o = &(_sm)->options[0]; \
  53                  ((char *)(_o)) < ((char *) &(_sm)->options[0] + \
  54                         (_sm)->options_size * (_sm)->n_options); \
  55                  _o = (struct uci_optmap *) ((char *)(_o) + \
  56                         (_sm)->options_size))
  57
  58
  59 static inline bool
  60 ucimap_is_alloc(enum ucimap_type type)
  61 {
  62         switch(type & UCIMAP_SUBTYPE) {
  63         case UCIMAP_STRING:
  64                 return true;
  65         default:
  66                 return false;
  67         }
  68 }
  69
  70 static inline bool
  71 ucimap_is_fixup(enum ucimap_type type)
  72 {
  73         switch(type & UCIMAP_SUBTYPE) {
  74         case UCIMAP_SECTION:
  75                 return true;
  76         default:
  77                 return false;
  78         }
  79 }
  80
  81 static inline bool
  82 ucimap_is_simple(enum ucimap_type type)
  83 {
  84         return ((type & UCIMAP_TYPE) == UCIMAP_SIMPLE);
  85 }
  86
  87 static inline bool
  88 ucimap_is_list(enum ucimap_type type)
  89 {
  90         return ((type & UCIMAP_TYPE) == UCIMAP_LIST);
  91 }
  92
  93 static inline bool
  94 ucimap_is_list_auto(enum ucimap_type type)
  95 {
  96         return ucimap_is_list(type) && !!(type & UCIMAP_LIST_AUTO);
  97 }
  98
  99 static inline bool
 100 ucimap_is_custom(enum ucimap_type type)
 101 {
 102         return ((type & UCIMAP_SUBTYPE) == UCIMAP_CUSTOM);
 103 }
 104
 105 static inline void *
 106 ucimap_section_ptr(struct ucimap_section_data *sd)
 107 {
 108         return ((char *) sd - sd->sm->smap_offset);
 109 }
 110
 111 static inline struct ucimap_section_data *
 112 ucimap_ptr_section(struct uci_sectionmap *sm, void *ptr) {
 113         ptr = (char *) ptr + sm->smap_offset;
 114         return ptr;
 115 }
 116
 117 static inline union ucimap_data *
 118 ucimap_get_data(struct ucimap_section_data *sd, struct uci_optmap *om)
 119 {
 120         void *data;
 121
 122         data = (char *) ucimap_section_ptr(sd) + om->offset;
 123         return data;
 124 }
 125
 126 int
 127 ucimap_init(struct uci_map *map)
 128 {
 129         map->fixup = NULL;
 130         map->sdata = NULL;
 131         map->fixup_tail = &map->fixup;
 132         map->sdata_tail = &map->sdata;
 133         return 0;
 134 }
 135
 136 static void
 137 ucimap_add_alloc(struct ucimap_section_data *sd, void *ptr)
 138 {
 139         struct ucimap_alloc *a = &sd->allocmap[sd->allocmap_len++];
 140         a->ptr = ptr;
 141 }
 142
 143 void
 144 ucimap_free_section(struct uci_map *map, struct ucimap_section_data *sd)
 145 {
 146         void *section;
 147         int i;
 148
 149         section = ucimap_section_ptr(sd);
 150         if (sd->ref)
 151                 *sd->ref = sd->next;
 152
 153         if (sd->sm->free)
 154                 sd->sm->free(map, section);
 155
 156         for (i = 0; i < sd->allocmap_len; i++) {
 157                 free(sd->allocmap[i].ptr);
 158         }
 159
 160         if (sd->alloc_custom) {
 161                 for (i = 0; i < sd->alloc_custom_len; i++) {
 162                         struct ucimap_alloc_custom *a = &sd->alloc_custom[i];
 163                         a->om->free(a->section, a->om, a->ptr);
 164                 }
 165                 free(sd->alloc_custom);
 166         }
 167
 168         free(sd->allocmap);
 169         free(sd);
 170 }
 171
 172 void
 173 ucimap_cleanup(struct uci_map *map)
 174 {
 175         struct ucimap_section_data *sd;
 176
 177         for (sd = map->sdata; sd; sd = sd->next) {
 178                 ucimap_free_section(map, sd);
 179         }
 180 }
 181
 182 static void *
 183 ucimap_find_section(struct uci_map *map, struct ucimap_fixup *f)
 184 {
 185         struct ucimap_section_data *sd;
 186
 187         for (sd = map->sdata; sd; sd = sd->next) {
 188                 if (sd->sm != f->sm)
 189                         continue;
 190                 if (strcmp(f->name, sd->section_name) != 0)
 191                         continue;
 192                 return ucimap_section_ptr(sd);
 193         }
 194         for (sd = map->pending; sd; sd = sd->next) {
 195                 if (sd->sm != f->sm)
 196                         continue;
 197                 if (strcmp(f->name, sd->section_name) != 0)
 198                         continue;
 199                 return ucimap_section_ptr(sd);
 200         }
 201         return NULL;
 202 }
 203
 204 static union ucimap_data *
 205 ucimap_list_append(struct ucimap_list *list)
 206 {
 207         if (unlikely(list->size <= list->n_items)) {
 208                 /* should not happen */
 209                 DPRINTF("ERROR: overflow while filling a list (size=%d)\n", list->size);
 210                 return NULL;
 211         }
 212         return &list->item[list->n_items++];
 213 }
 214
 215
 216 static bool
 217 ucimap_handle_fixup(struct uci_map *map, struct ucimap_fixup *f)
 218 {
 219         void *ptr = ucimap_find_section(map, f);
 220         struct ucimap_list *list;
 221         union ucimap_data *data;
 222
 223         if (!ptr)
 224                 return false;
 225
 226         switch(f->type & UCIMAP_TYPE) {
 227         case UCIMAP_SIMPLE:
 228                 f->data->ptr = ptr;
 229                 break;
 230         case UCIMAP_LIST:
 231                 list = f->data->list;
 232                 data = ucimap_list_append(f->data->list);
 233                 if (!data)
 234                         return false;
 235
 236                 data->ptr = ptr;
 237                 break;
 238         }
 239         return true;
 240 }
 241
 242 void
 243 ucimap_free_item(struct ucimap_section_data *sd, void *item)
 244 {
 245         struct ucimap_alloc_custom *ac;
 246         struct ucimap_alloc *a;
 247         void *ptr = *((void **) item);
 248         int i;
 249
 250         if (!ptr)
 251                 return;
 252
 253         *((void **)item) = NULL;
 254         for (i = 0, a = sd->allocmap; i < sd->allocmap_len; i++, a++) {
 255                 if (a->ptr != ptr)
 256                         continue;
 257
 258                 if (i != sd->allocmap_len - 1)
 259                         a->ptr = sd->allocmap[sd->allocmap_len - 1].ptr;
 260
 261                 sd->allocmap_len--;
 262                 return;
 263         }
 264
 265         for (i = 0, ac = sd->alloc_custom; i < sd->alloc_custom_len; i++, ac++) {
 266                 if (ac->ptr != ptr)
 267                         continue;
 268
 269                 if (i != sd->alloc_custom_len - 1)
 270                         memcpy(ac, &sd->alloc_custom[sd->alloc_custom_len - 1],
 271                                 sizeof(struct ucimap_alloc_custom));
 272
 273                 ac->om->free(ac->section, ac->om, ac->ptr);
 274                 sd->alloc_custom_len--;
 275                 return;
 276         }
 277 }
 278
 279 int
 280 ucimap_resize_list(struct ucimap_section_data *sd, struct ucimap_list **list, int items)
 281 {
 282         struct ucimap_list *new;
 283         struct ucimap_alloc *a;
 284         int i, offset = 0;
 285         int size = sizeof(struct ucimap_list) + items * sizeof(union ucimap_data);
 286
 287         if (!*list) {
 288                 new = calloc(1, size);
 289
 290                 ucimap_add_alloc(sd, new);
 291                 goto set;
 292         }
 293
 294         for (i = 0, a = sd->allocmap; i < sd->allocmap_len; i++, a++) {
 295                 if (a->ptr != *list)
 296                         continue;
 297
 298                 goto realloc;
 299         }
 300         return -ENOENT;
 301
 302 realloc:
 303         if (items > (*list)->size)
 304                 offset = (items - (*list)->size) * sizeof(union ucimap_data);
 305
 306         a->ptr = realloc(a->ptr, size);
 307         if (offset)
 308                 memset((char *) a->ptr + offset, 0, size - offset);
 309         new = a->ptr;
 310
 311 set:
 312         new->size = items;
 313         *list = new;
 314         return 0;
 315 }
 316
 317 static void
 318 ucimap_add_fixup(struct ucimap_section_data *sd, union ucimap_data *data, struct uci_optmap *om, const char *str)
 319 {
 320         struct ucimap_fixup *f, tmp;
 321         struct uci_map *map = sd->map;
 322
 323         tmp.sm = om->data.sm;
 324         tmp.name = str;
 325         tmp.type = om->type;
 326         tmp.data = data;
 327         if (ucimap_handle_fixup(map, &tmp))
 328                 return;
 329
 330         f = malloc(sizeof(struct ucimap_fixup));
 331         if (!f)
 332                 return;
 333
 334         memcpy(f, &tmp, sizeof(tmp));
 335         f->next = NULL;
 336         *map->fixup_tail = f;
 337         map->fixup_tail = &f->next;
 338 }
 339
 340 static void
 341 ucimap_add_custom_alloc(struct ucimap_section_data *sd, struct uci_optmap *om, void *ptr)
 342 {
 343         struct ucimap_alloc_custom *a = &sd->alloc_custom[sd->alloc_custom_len++];
 344
 345         a->section = ucimap_section_ptr(sd);
 346         a->om = om;
 347         a->ptr = ptr;
 348 }
 349
 350 static void
 351 ucimap_add_value(union ucimap_data *data, struct uci_optmap *om, struct ucimap_section_data *sd, const char *str)
 352 {
 353         union ucimap_data tdata = *data;
 354         char *eptr = NULL;
 355         long lval;
 356         char *s;
 357         int val;
 358
 359         if (ucimap_is_list(om->type) && !ucimap_is_fixup(om->type)) {
 360                 data = ucimap_list_append(data->list);
 361                 if (!data)
 362                         return;
 363         }
 364
 365         switch(om->type & UCIMAP_SUBTYPE) {
 366         case UCIMAP_STRING:
 367                 if ((om->data.s.maxlen > 0) &&
 368                         (strlen(str) > om->data.s.maxlen))
 369                         return;
 370
 371                 s = strdup(str);
 372                 tdata.s = s;
 373                 ucimap_add_alloc(sd, s);
 374                 break;
 375         case UCIMAP_BOOL:
 376                 if (!strcmp(str, "on"))
 377                         val = true;
 378                 else if (!strcmp(str, "1"))
 379                         val = true;
 380                 else if (!strcmp(str, "enabled"))
 381                         val = true;
 382                 else if (!strcmp(str, "off"))
 383                         val = false;
 384                 else if (!strcmp(str, "0"))
 385                         val = false;
 386                 else if (!strcmp(str, "disabled"))
 387                         val = false;
 388                 else
 389                         return;
 390
 391                 tdata.b = val;
 392                 break;
 393         case UCIMAP_INT:
 394                 lval = strtol(str, &eptr, om->data.i.base);
 395                 if (lval < INT_MIN || lval > INT_MAX)
 396                         return;
 397
 398                 if (!eptr || *eptr == '\0')
 399                         tdata.i = (int) lval;
 400                 else
 401                         return;
 402                 break;
 403         case UCIMAP_SECTION:
 404                 ucimap_add_fixup(sd, data, om, str);
 405                 return;
 406         case UCIMAP_CUSTOM:
 407                 tdata.s = (char *) data;
 408                 break;
 409         }
 410         if (om->parse) {
 411                 if (om->parse(ucimap_section_ptr(sd), om, &tdata, str) < 0)
 412                         return;
 413                 if (ucimap_is_custom(om->type) && om->free) {
 414                         if (tdata.ptr != data->ptr)
 415                                 ucimap_add_custom_alloc(sd, om, data->ptr);
 416                 }
 417         }
 418         if (ucimap_is_custom(om->type))
 419                 return;
 420         memcpy(data, &tdata, sizeof(union ucimap_data));
 421 }
 422
 423
 424 static void
 425 ucimap_convert_list(union ucimap_data *data, struct uci_optmap *om, struct ucimap_section_data *sd, const char *str)
 426 {
 427         char *s, *p;
 428
 429         s = strdup(str);
 430         if (!s)
 431                 return;
 432
 433         ucimap_add_alloc(sd, s);
 434
 435         do {
 436                 while (isspace(*s))
 437                         s++;
 438
 439                 if (!*s)
 440                         break;
 441
 442                 p = s;
 443                 while (*s && !isspace(*s))
 444                         s++;
 445
 446                 if (isspace(*s)) {
 447                         *s = 0;
 448                         s++;
 449                 }
 450
 451                 ucimap_add_value(data, om, sd, p);
 452         } while (*s);
 453 }
 454
 455 static int
 456 ucimap_parse_options(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s)
 457 {
 458         struct uci_element *e, *l;
 459         struct uci_option *o;
 460         union ucimap_data *data;
 461
 462         uci_foreach_element(&s->options, e) {
 463                 struct uci_optmap *om = NULL, *tmp;
 464
 465                 ucimap_foreach_option(sm, tmp) {
 466                         if (strcmp(e->name, tmp->name) == 0) {
 467                                 om = tmp;
 468                                 break;
 469                         }
 470                 }
 471                 if (!om)
 472                         continue;
 473
 474                 data = ucimap_get_data(sd, om);
 475                 o = uci_to_option(e);
 476                 if ((o->type == UCI_TYPE_STRING) && ucimap_is_simple(om->type)) {
 477                         ucimap_add_value(data, om, sd, o->v.string);
 478                 } else if ((o->type == UCI_TYPE_LIST) && ucimap_is_list(om->type)) {
 479                         uci_foreach_element(&o->v.list, l) {
 480                                 ucimap_add_value(data, om, sd, l->name);
 481                         }
 482                 } else if ((o->type == UCI_TYPE_STRING) && ucimap_is_list_auto(om->type)) {
 483                         ucimap_convert_list(data, om, sd, o->v.string);
 484                 }
 485         }
 486
 487         return 0;
 488 }
 489
 490 static void
 491 ucimap_add_section_list(struct uci_map *map, struct ucimap_section_data *sd)
 492 {
 493         sd->ref = map->sdata_tail;
 494         *sd->ref = sd;
 495         map->sdata_tail = &sd->next;
 496 }
 497
 498 static void
 499 ucimap_add_section(struct ucimap_section_data *sd)
 500 {
 501         struct uci_map *map = sd->map;
 502
 503         sd->next = NULL;
 504         if (sd->sm->add(map, ucimap_section_ptr(sd)) < 0)
 505                 ucimap_free_section(map, sd);
 506         else
 507                 ucimap_add_section_list(map, sd);
 508 }
 509
 510 #ifdef UCI_DEBUG
 511 static const char *ucimap_type_names[] = {
 512         [UCIMAP_STRING] = "string",
 513         [UCIMAP_INT] = "integer",
 514         [UCIMAP_BOOL] = "boolean",
 515         [UCIMAP_SECTION] = "section",
 516         [UCIMAP_LIST] = "list",
 517 };
 518
 519 static const char *
 520 ucimap_get_type_name(int type)
 521 {
 522         static char buf[32];
 523         const char *name;
 524
 525         if (ucimap_is_list(type))
 526                 return ucimap_type_names[UCIMAP_LIST];
 527
 528         name = ucimap_type_names[type & UCIMAP_SUBTYPE];
 529         if (!name) {
 530                 sprintf(buf, "Unknown (%d)", type & UCIMAP_SUBTYPE);
 531                 name = buf;
 532         }
 533
 534         return name;
 535 }
 536 #endif
 537
 538 static bool
 539 ucimap_check_optmap_type(struct uci_sectionmap *sm, struct uci_optmap *om)
 540 {
 541         unsigned int type;
 542
 543         if (unlikely(sm->type_name != om->type_name) &&
 544             unlikely(strcmp(sm->type_name, om->type_name) != 0)) {
 545                 DPRINTF("Option '%s' of section type '%s' refereces unknown "
 546                         "section type '%s', should be '%s'.\n",
 547                         om->name, sm->type, om->type_name, sm->type_name);
 548                 return false;
 549         }
 550
 551         if (om->detected_type < 0)
 552                 return true;
 553
 554         if (ucimap_is_custom(om->type))
 555                 return true;
 556
 557         if (ucimap_is_list(om->type) !=
 558             ucimap_is_list(om->detected_type))
 559                 goto failed;
 560
 561         if (ucimap_is_list(om->type))
 562                 return true;
 563
 564         type = om->type & UCIMAP_SUBTYPE;
 565         switch(type) {
 566         case UCIMAP_STRING:
 567         case UCIMAP_INT:
 568         case UCIMAP_BOOL:
 569                 if (type != om->detected_type)
 570                         goto failed;
 571                 break;
 572         case UCIMAP_SECTION:
 573                 goto failed;
 574         default:
 575                 break;
 576         }
 577         return true;
 578
 579 failed:
 580         DPRINTF("Invalid type in option '%s' of section type '%s', "
 581                 "declared type is %s, detected type is %s\n",
 582                 om->name, sm->type,
 583                 ucimap_get_type_name(om->type),
 584                 ucimap_get_type_name(om->detected_type));
 585         return false;
 586 }
 587
 588 static void
 589 ucimap_count_alloc(struct uci_optmap *om, int *n_alloc, int *n_custom)
 590 {
 591         if (ucimap_is_alloc(om->type))
 592                 (*n_alloc)++;
 593         else if (ucimap_is_custom(om->type) && om->free)
 594                 (*n_custom)++;
 595 }
 596
 597 int
 598 ucimap_parse_section(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s)
 599 {
 600         struct uci_optmap *om;
 601         char *section_name;
 602         void *section;
 603         int n_alloc = 2;
 604         int n_alloc_custom = 0;
 605         int err;
 606
 607         sd->map = map;
 608         sd->sm = sm;
 609
 610         ucimap_foreach_option(sm, om) {
 611                 if (!ucimap_check_optmap_type(sm, om))
 612                         continue;
 613
 614                 if (ucimap_is_list(om->type)) {
 615                         union ucimap_data *data;
 616                         struct uci_element *e;
 617                         int n_elements = 0;
 618                         int n_elements_alloc = 0;
 619                         int n_elements_custom = 0;
 620                         int size;
 621
 622                         data = ucimap_get_data(sd, om);
 623                         uci_foreach_element(&s->options, e) {
 624                                 struct uci_option *o = uci_to_option(e);
 625                                 struct uci_element *tmp;
 626
 627                                 if (strcmp(e->name, om->name) != 0)
 628                                         continue;
 629
 630                                 if (o->type == UCI_TYPE_LIST) {
 631                                         uci_foreach_element(&o->v.list, tmp) {
 632                                                 ucimap_count_alloc(om, &n_elements_alloc, &n_elements_custom);
 633                                                 n_elements++;
 634                                         }
 635                                 } else if ((o->type == UCI_TYPE_STRING) &&
 636                                            ucimap_is_list_auto(om->type)) {
 637                                         const char *data = o->v.string;
 638                                         do {
 639                                                 while (isspace(*data))
 640                                                         data++;
 641
 642                                                 if (!*data)
 643                                                         break;
 644
 645                                                 n_elements++;
 646                                                 ucimap_count_alloc(om, &n_elements_alloc, &n_elements_custom);
 647
 648                                                 while (*data && !isspace(*data))
 649                                                         data++;
 650                                         } while (*data);
 651
 652                                         /* for the duplicated data string */
 653                                         if (n_elements)
 654                                                 n_alloc++;
 655                                 }
 656                                 break;
 657                         }
 658                         /* add one more for the ucimap_list */
 659                         n_alloc += n_elements_alloc + 1;
 660                         n_alloc_custom += n_elements_custom;
 661                         size = sizeof(struct ucimap_list) +
 662                                 n_elements * sizeof(union ucimap_data);
 663
 664                         data->list = malloc(size);
 665                         if (!data->list)
 666                                 goto error_mem;
 667
 668                         memset(data->list, 0, size);
 669                         data->list->size = n_elements;
 670                 } else {
 671                         ucimap_count_alloc(om, &n_alloc, &n_alloc_custom);
 672                 }
 673         }
 674
 675         sd->allocmap = calloc(n_alloc, sizeof(struct ucimap_alloc));
 676         if (!sd->allocmap)
 677                 goto error_mem;
 678
 679         if (n_alloc_custom > 0) {
 680                 sd->alloc_custom = calloc(n_alloc_custom, sizeof(struct ucimap_alloc_custom));
 681                 if (!sd->alloc_custom)
 682                         goto error_mem;
 683         }
 684
 685         section_name = strdup(s->e.name);
 686         if (!section_name)
 687                 goto error_mem;
 688
 689         sd->section_name = section_name;
 690
 691         sd->cmap = calloc(1, BITFIELD_SIZE(sm->n_options));
 692         if (!sd->cmap)
 693                 goto error_mem;
 694
 695         ucimap_add_alloc(sd, (void *)section_name);
 696         ucimap_add_alloc(sd, (void *)sd->cmap);
 697         ucimap_foreach_option(sm, om) {
 698                 if (!ucimap_is_list(om->type))
 699                         continue;
 700
 701                 ucimap_add_alloc(sd, ucimap_get_data(sd, om)->list);
 702         }
 703
 704         section = ucimap_section_ptr(sd);
 705         err = sm->init(map, section, s);
 706         if (err)
 707                 goto error;
 708
 709         if (map->parsed) {
 710                 ucimap_add_section(sd);
 711         } else {
 712                 ucimap_add_section_list(map, sd);
 713         }
 714
 715         err = ucimap_parse_options(map, sm, sd, s);
 716         if (err)
 717                 goto error;
 718
 719         return 0;
 720
 721 error_mem:
 722         if (sd->allocmap)
 723                 free(sd->allocmap);
 724         free(sd);
 725         return UCI_ERR_MEM;
 726
 727 error:
 728         ucimap_free_section(map, sd);
 729         return err;
 730 }
 731
 732 static int
 733 ucimap_fill_ptr(struct uci_ptr *ptr, struct uci_section *s, const char *option)
 734 {
 735         struct uci_package *p = s->package;
 736
 737         memset(ptr, 0, sizeof(struct uci_ptr));
 738
 739         ptr->package = p->e.name;
 740         ptr->p = p;
 741
 742         ptr->section = s->e.name;
 743         ptr->s = s;
 744
 745         ptr->option = option;
 746         return uci_lookup_ptr(p->ctx, ptr, NULL, false);
 747 }
 748
 749 void
 750 ucimap_set_changed(struct ucimap_section_data *sd, void *field)
 751 {
 752         void *section = ucimap_section_ptr(sd);
 753         struct uci_sectionmap *sm = sd->sm;
 754         struct uci_optmap *om;
 755         int ofs = (char *)field - (char *)section;
 756         int i = 0;
 757
 758         ucimap_foreach_option(sm, om) {
 759                 if (om->offset == ofs) {
 760                         SET_BIT(sd->cmap, i);
 761                         break;
 762                 }
 763                 i++;
 764         }
 765 }
 766
 767 static char *
 768 ucimap_data_to_string(struct ucimap_section_data *sd, struct uci_optmap *om, union ucimap_data *data)
 769 {
 770         static char buf[32];
 771         char *str = NULL;
 772
 773         switch(om->type & UCIMAP_SUBTYPE) {
 774         case UCIMAP_STRING:
 775                 str = data->s;
 776                 break;
 777         case UCIMAP_INT:
 778                 sprintf(buf, "%d", data->i);
 779                 str = buf;
 780                 break;
 781         case UCIMAP_BOOL:
 782                 sprintf(buf, "%d", !!data->b);
 783                 str = buf;
 784                 break;
 785         case UCIMAP_SECTION:
 786                 if (data->ptr)
 787                         str = (char *) ucimap_ptr_section(om->data.sm, data->ptr)->section_name;
 788                 else
 789                         str = "";
 790                 break;
 791         case UCIMAP_CUSTOM:
 792                 break;
 793         default:
 794                 return NULL;
 795         }
 796
 797         if (om->format) {
 798                 union ucimap_data tdata;
 799
 800                 if (ucimap_is_custom(om->type)) {
 801                         tdata.s = (char *)data;
 802                         data = &tdata;
 803                 }
 804
 805                 if (om->format(ucimap_section_ptr(sd), om, data, &str) < 0)
 806                         return NULL;
 807
 808                 if (!str)
 809                         str = "";
 810         }
 811         return str;
 812 }
 813
 814 int
 815 ucimap_store_section(struct uci_map *map, struct uci_package *p, struct ucimap_section_data *sd)
 816 {
 817         struct uci_sectionmap *sm = sd->sm;
 818         struct uci_section *s = NULL;
 819         struct uci_optmap *om;
 820         struct uci_element *e;
 821         struct uci_ptr ptr;
 822         int i = 0;
 823         int ret;
 824
 825         uci_foreach_element(&p->sections, e) {
 826                 if (!strcmp(e->name, sd->section_name)) {
 827                         s = uci_to_section(e);
 828                         break;
 829                 }
 830         }
 831         if (!s)
 832                 return UCI_ERR_NOTFOUND;
 833
 834         ucimap_foreach_option(sm, om) {
 835                 union ucimap_data *data;
 836
 837                 i++;
 838                 data = ucimap_get_data(sd, om);
 839                 if (!TEST_BIT(sd->cmap, i - 1))
 840                         continue;
 841
 842                 ucimap_fill_ptr(&ptr, s, om->name);
 843                 if (ucimap_is_list(om->type)) {
 844                         struct ucimap_list *list = data->list;
 845                         bool first = true;
 846                         int j;
 847
 848                         for (j = 0; j < list->n_items; j++) {
 849                                 ptr.value = ucimap_data_to_string(sd, om, &list->item[j]);
 850                                 if (!ptr.value)
 851                                         continue;
 852
 853                                 if (first) {
 854                                         ret = uci_set(s->package->ctx, &ptr);
 855                                         first = false;
 856                                 } else {
 857                                         ret = uci_add_list(s->package->ctx, &ptr);
 858                                 }
 859                                 if (ret)
 860                                         return ret;
 861                         }
 862                 } else {
 863                         ptr.value = ucimap_data_to_string(sd, om, data);
 864                         if (!ptr.value)
 865                                 continue;
 866
 867                         ret = uci_set(s->package->ctx, &ptr);
 868                         if (ret)
 869                                 return ret;
 870                 }
 871
 872                 CLR_BIT(sd->cmap, i - 1);
 873         }
 874
 875         return 0;
 876 }
 877
 878 void
 879 ucimap_parse(struct uci_map *map, struct uci_package *pkg)
 880 {
 881         struct uci_element *e;
 882         struct ucimap_section_data *sd, **sd_tail;
 883         struct ucimap_fixup *f;
 884         int i;
 885
 886         sd_tail = map->sdata_tail;
 887         map->parsed = false;
 888         map->sdata_tail = &map->pending;
 889         uci_foreach_element(&pkg->sections, e) {
 890                 struct uci_section *s = uci_to_section(e);
 891
 892                 for (i = 0; i < map->n_sections; i++) {
 893                         struct uci_sectionmap *sm = map->sections[i];
 894                         struct ucimap_section_data *sd;
 895
 896                         if (strcmp(s->type, map->sections[i]->type) != 0)
 897                                 continue;
 898
 899                         if (sm->alloc) {
 900                                 sd = sm->alloc(map, sm, s);
 901                                 memset(sd, 0, sizeof(struct ucimap_section_data));
 902                         } else {
 903                                 sd = malloc(sm->alloc_len);
 904                                 memset(sd, 0, sm->alloc_len);
 905                         }
 906                         if (!sd)
 907                                 continue;
 908
 909                         ucimap_parse_section(map, sm, sd, s);
 910                 }
 911         }
 912         if (!map->parsed) {
 913                 map->parsed = true;
 914                 map->sdata_tail = sd_tail;
 915         }
 916
 917         f = map->fixup;
 918         while (f) {
 919                 struct ucimap_fixup *next = f->next;
 920                 ucimap_handle_fixup(map, f);
 921                 free(f);
 922                 f = next;
 923         }
 924         map->fixup_tail = &map->fixup;
 925         map->fixup = NULL;
 926
 927         sd = map->pending;
 928         while (sd) {
 929                 struct ucimap_section_data *next = sd->next;
 930                 ucimap_add_section(sd);
 931                 sd = next;
 932         }
 933         map->pending = NULL;
 934 }