lua/uci.c

   1 /*
   2  * libuci plugin for Lua
   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 General Public License version 2
   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 #include <sys/types.h>
  16 #include <sys/time.h>
  17 #include <stdbool.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <errno.h>
  23
  24 #include <lauxlib.h>
  25 #include <uci.h>
  26
  27 #define MODNAME        "uci"
  28 #define METANAME       MODNAME ".meta"
  29 //#define DEBUG 1
  30
  31 #ifdef DEBUG
  32 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
  33 #else
  34 #define DPRINTF(...) do {} while (0)
  35 #endif
  36
  37 static struct uci_context *global_ctx = NULL;
  38
  39 static struct uci_context *
  40 find_context(lua_State *L, int *offset)
  41 {
  42         struct uci_context **ctx;
  43         if (!lua_isuserdata(L, 1)) {
  44                 if (!global_ctx) {
  45                         global_ctx = uci_alloc_context();
  46                         if (!global_ctx)
  47                                 luaL_error(L, "failed to allocate UCI context");
  48                 }
  49                 if (offset)
  50                         *offset = 0;
  51                 return global_ctx;
  52         }
  53         if (offset)
  54                 *offset = 1;
  55         ctx = luaL_checkudata(L, 1, METANAME);
  56         if (!ctx || !*ctx)
  57                 luaL_error(L, "failed to get UCI context");
  58
  59         return *ctx;
  60 }
  61
  62 static struct uci_package *
  63 find_package(lua_State *L, struct uci_context *ctx, const char *str, bool al)
  64 {
  65         struct uci_package *p = NULL;
  66         struct uci_element *e;
  67         char *sep;
  68         char *name;
  69
  70         sep = strchr(str, '.');
  71         if (sep) {
  72                 name = malloc(1 + sep - str);
  73                 if (!name)
  74                         luaL_error(L, "out of memory");
  75                 strncpy(name, str, sep - str);
  76                 name[sep - str] = 0;
  77         } else
  78                 name = (char *) str;
  79
  80         uci_foreach_element(&ctx->root, e) {
  81                 if (strcmp(e->name, name) != 0)
  82                         continue;
  83
  84                 p = uci_to_package(e);
  85                 goto done;
  86         }
  87
  88         if (al == true)
  89                 uci_load(ctx, name, &p);
  90         else if (al) {
  91                 uci_load(ctx, name, &p);
  92         }
  93
  94 done:
  95         if (name != str)
  96                 free(name);
  97         return p;
  98 }
  99
 100 static int
 101 lookup_args(lua_State *L, struct uci_context *ctx, int offset, struct uci_ptr *ptr, char **buf)
 102 {
 103         char *s = NULL;
 104         int n;
 105
 106         n = lua_gettop(L);
 107         luaL_checkstring(L, 1 + offset);
 108         s = strdup(lua_tostring(L, 1 + offset));
 109         if (!s)
 110                 goto error;
 111
 112         memset(ptr, 0, sizeof(struct uci_ptr));
 113         if (!find_package(L, ctx, s, true))
 114                 goto error;
 115
 116         switch (n - offset) {
 117         case 4:
 118         case 3:
 119                 ptr->option = luaL_checkstring(L, 3 + offset);
 120                 /* fall through */
 121         case 2:
 122                 ptr->section = luaL_checkstring(L, 2 + offset);
 123                 ptr->package = luaL_checkstring(L, 1 + offset);
 124                 if (uci_lookup_ptr(ctx, ptr, NULL, false) != UCI_OK)
 125                         goto error;
 126                 break;
 127         case 1:
 128                 if (uci_lookup_ptr(ctx, ptr, s, false) != UCI_OK)
 129                         goto error;
 130                 break;
 131         default:
 132                 luaL_error(L, "invalid argument count");
 133                 goto error;
 134         }
 135
 136         *buf = s;
 137         return 0;
 138
 139 error:
 140         if (s)
 141                 free(s);
 142         return 1;
 143 }
 144
 145 static int
 146 uci_push_status(lua_State *L, struct uci_context *ctx, bool hasarg)
 147 {
 148         char *str = NULL;
 149
 150         if (!hasarg)
 151                 lua_pushboolean(L, (ctx->err == UCI_OK));
 152         if (ctx->err) {
 153                 uci_get_errorstr(ctx, &str, MODNAME);
 154                 if (str) {
 155                         lua_pushstring(L, str);
 156                         free(str);
 157                         return 2;
 158                 }
 159         }
 160         return 1;
 161 }
 162
 163 static void
 164 uci_push_option(lua_State *L, struct uci_option *o)
 165 {
 166         struct uci_element *e;
 167         int i = 0;
 168
 169         switch(o->type) {
 170         case UCI_TYPE_STRING:
 171                 lua_pushstring(L, o->v.string);
 172                 break;
 173         case UCI_TYPE_LIST:
 174                 lua_newtable(L);
 175                 uci_foreach_element(&o->v.list, e) {
 176                         i++;
 177                         lua_pushstring(L, e->name);
 178                         lua_rawseti(L, -2, i);
 179                 }
 180                 break;
 181         default:
 182                 lua_pushnil(L);
 183                 break;
 184         }
 185 }
 186
 187 static void
 188 uci_push_section(lua_State *L, struct uci_section *s, int index)
 189 {
 190         struct uci_element *e;
 191
 192         lua_newtable(L);
 193         lua_pushboolean(L, s->anonymous);
 194         lua_setfield(L, -2, ".anonymous");
 195         lua_pushstring(L, s->type);
 196         lua_setfield(L, -2, ".type");
 197         lua_pushstring(L, s->e.name);
 198         lua_setfield(L, -2, ".name");
 199         if (index >= 0) {
 200                 lua_pushinteger(L, index);
 201                 lua_setfield(L, -2, ".index");
 202         }
 203
 204         uci_foreach_element(&s->options, e) {
 205                 struct uci_option *o = uci_to_option(e);
 206                 uci_push_option(L, o);
 207                 lua_setfield(L, -2, o->e.name);
 208         }
 209 }
 210
 211 static void
 212 uci_push_package(lua_State *L, struct uci_package *p)
 213 {
 214         struct uci_element *e;
 215         int i = 0;
 216
 217         lua_newtable(L);
 218         uci_foreach_element(&p->sections, e) {
 219                 uci_push_section(L, uci_to_section(e), i);
 220                 lua_setfield(L, -2, e->name);
 221                 i++;
 222         }
 223 }
 224
 225 static int
 226 uci_lua_unload(lua_State *L)
 227 {
 228         struct uci_context *ctx;
 229         struct uci_package *p;
 230         const char *s;
 231         int offset = 0;
 232
 233         ctx = find_context(L, &offset);
 234         luaL_checkstring(L, 1 + offset);
 235         s = lua_tostring(L, 1 + offset);
 236         p = find_package(L, ctx, s, false);
 237         if (p) {
 238                 uci_unload(ctx, p);
 239                 return uci_push_status(L, ctx, false);
 240         } else {
 241                 lua_pushboolean(L, 0);
 242         }
 243         return 1;
 244 }
 245
 246 static int
 247 uci_lua_load(lua_State *L)
 248 {
 249         struct uci_context *ctx;
 250         struct uci_package *p = NULL;
 251         const char *s;
 252         int offset = 0;
 253
 254         ctx = find_context(L, &offset);
 255         uci_lua_unload(L);
 256         lua_pop(L, 1); /* bool ret value of unload */
 257         s = lua_tostring(L, -1);
 258
 259         uci_load(ctx, s, &p);
 260         return uci_push_status(L, ctx, false);
 261 }
 262
 263
 264 static int
 265 uci_lua_foreach(lua_State *L)
 266 {
 267         struct uci_context *ctx;
 268         struct uci_package *p;
 269         struct uci_element *e;
 270         const char *package, *type;
 271         bool ret = false;
 272         int offset = 0;
 273         int i = 0;
 274
 275         ctx = find_context(L, &offset);
 276         package = luaL_checkstring(L, 1 + offset);
 277
 278         if (lua_isnil(L, 2))
 279                 type = NULL;
 280         else
 281                 type = luaL_checkstring(L, 2 + offset);
 282
 283         if (!lua_isfunction(L, 3 + offset) || !package)
 284                 luaL_error(L, "Invalid argument");
 285
 286         p = find_package(L, ctx, package, true);
 287         if (!p)
 288                 goto done;
 289
 290         uci_foreach_element(&p->sections, e) {
 291                 struct uci_section *s = uci_to_section(e);
 292
 293                 i++;
 294
 295                 if (type && (strcmp(s->type, type) != 0))
 296                         continue;
 297
 298                 lua_pushvalue(L, 3 + offset); /* iterator function */
 299                 uci_push_section(L, s, i - 1);
 300                 if (lua_pcall(L, 1, 0, 0) == 0)
 301                         ret = true;
 302         }
 303
 304 done:
 305         lua_pushboolean(L, ret);
 306         return 1;
 307 }
 308
 309 static int
 310 uci_lua_get_any(lua_State *L, bool all)
 311 {
 312         struct uci_context *ctx;
 313         struct uci_element *e = NULL;
 314         struct uci_ptr ptr;
 315         int offset = 0;
 316         char *s = NULL;
 317         int err = UCI_ERR_NOTFOUND;
 318
 319         ctx = find_context(L, &offset);
 320
 321         if (lookup_args(L, ctx, offset, &ptr, &s))
 322                 goto error;
 323
 324         uci_lookup_ptr(ctx, &ptr, NULL, false);
 325         if (!all && !ptr.s) {
 326                 err = UCI_ERR_INVAL;
 327                 goto error;
 328         }
 329         if (!(ptr.flags & UCI_LOOKUP_COMPLETE)) {
 330                 err = UCI_ERR_NOTFOUND;
 331                 goto error;
 332         }
 333
 334         err = UCI_OK;
 335         e = ptr.last;
 336         switch(e->type) {
 337                 case UCI_TYPE_PACKAGE:
 338                         uci_push_package(L, ptr.p);
 339                         break;
 340                 case UCI_TYPE_SECTION:
 341                         if (all)
 342                                 uci_push_section(L, ptr.s, -1);
 343                         else
 344                                 lua_pushstring(L, ptr.s->type);
 345                         break;
 346                 case UCI_TYPE_OPTION:
 347                         uci_push_option(L, ptr.o);
 348                         break;
 349                 default:
 350                         err = UCI_ERR_INVAL;
 351                         goto error;
 352         }
 353         if (!err)
 354                 return 1;
 355
 356 error:
 357         if (s)
 358                 free(s);
 359
 360         lua_pushnil(L);
 361         return uci_push_status(L, ctx, true);
 362 }
 363
 364 static int
 365 uci_lua_get(lua_State *L)
 366 {
 367         return uci_lua_get_any(L, false);
 368 }
 369
 370 static int
 371 uci_lua_get_all(lua_State *L)
 372 {
 373         return uci_lua_get_any(L, true);
 374 }
 375
 376 static int
 377 uci_lua_add(lua_State *L)
 378 {
 379         struct uci_context *ctx;
 380         struct uci_section *s = NULL;
 381         struct uci_package *p;
 382         const char *package;
 383         const char *type;
 384         const char *name = NULL;
 385         int offset = 0;
 386
 387         ctx = find_context(L, &offset);
 388         package = luaL_checkstring(L, 1 + offset);
 389         type = luaL_checkstring(L, 2 + offset);
 390         p = find_package(L, ctx, package, true);
 391         if (!p)
 392                 goto fail;
 393
 394         if (uci_add_section(ctx, p, type, &s) || !s)
 395                 goto fail;
 396
 397         name = s->e.name;
 398         lua_pushstring(L, name);
 399         return 1;
 400
 401 fail:
 402         lua_pushnil(L);
 403         return uci_push_status(L, ctx, true);
 404 }
 405
 406 static int
 407 uci_lua_delete(lua_State *L)
 408 {
 409         struct uci_context *ctx;
 410         struct uci_ptr ptr;
 411         int offset = 0;
 412         char *s = NULL;
 413         int err = UCI_ERR_NOTFOUND;
 414
 415         ctx = find_context(L, &offset);
 416
 417         if (lookup_args(L, ctx, offset, &ptr, &s))
 418                 goto error;
 419
 420         err = uci_delete(ctx, &ptr);
 421
 422 error:
 423         if (s)
 424                 free(s);
 425         return uci_push_status(L, ctx, false);
 426 }
 427
 428 static int
 429 uci_lua_rename(lua_State *L)
 430 {
 431         struct uci_context *ctx;
 432         struct uci_ptr ptr;
 433         int err = UCI_ERR_MEM;
 434         char *s = NULL;
 435         int nargs, offset = 0;
 436
 437         ctx = find_context(L, &offset);
 438         nargs = lua_gettop(L);
 439         if (lookup_args(L, ctx, offset, &ptr, &s))
 440                 goto error;
 441
 442         switch(nargs - offset) {
 443         case 1:
 444                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 445                 break;
 446         case 4:
 447                 /* Format: uci.set("p", "s", "o", "v") */
 448                 ptr.value = luaL_checkstring(L, nargs);
 449                 break;
 450         case 3:
 451                 /* Format: uci.set("p", "s", "v") */
 452                 ptr.value = ptr.option;
 453                 ptr.option = NULL;
 454                 break;
 455         default:
 456                 err = UCI_ERR_INVAL;
 457                 goto error;
 458         }
 459
 460         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 461         if (err)
 462                 goto error;
 463
 464         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 465                 err = UCI_ERR_INVAL;
 466                 goto error;
 467         }
 468
 469         err = uci_rename(ctx, &ptr);
 470         if (err)
 471                 goto error;
 472
 473 error:
 474         return uci_push_status(L, ctx, false);
 475 }
 476
 477 static int
 478 uci_lua_reorder(lua_State *L)
 479 {
 480         struct uci_context *ctx;
 481         struct uci_ptr ptr;
 482         int err = UCI_ERR_MEM;
 483         char *s = NULL;
 484         int nargs, offset = 0;
 485
 486         ctx = find_context(L, &offset);
 487         nargs = lua_gettop(L);
 488         if (lookup_args(L, ctx, offset, &ptr, &s))
 489                 goto error;
 490
 491         switch(nargs - offset) {
 492         case 1:
 493                 /* Format: uci.set("p.s=v") or uci.set("p.s=v") */
 494                 if (ptr.option) {
 495                         err = UCI_ERR_INVAL;
 496                         goto error;
 497                 }
 498                 break;
 499         case 3:
 500                 /* Format: uci.set("p", "s", "v") */
 501                 ptr.value = ptr.option;
 502                 ptr.option = NULL;
 503                 break;
 504         default:
 505                 err = UCI_ERR_INVAL;
 506                 goto error;
 507         }
 508
 509         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 510         if (err)
 511                 goto error;
 512
 513         if ((ptr.s == NULL) || (ptr.value == NULL)) {
 514                 err = UCI_ERR_INVAL;
 515                 goto error;
 516         }
 517
 518         err = uci_reorder_section(ctx, ptr.s, strtoul(ptr.value, NULL, 10));
 519         if (err)
 520                 goto error;
 521
 522 error:
 523         return uci_push_status(L, ctx, false);
 524 }
 525
 526
 527 static int
 528 uci_lua_set(lua_State *L)
 529 {
 530         struct uci_context *ctx;
 531         struct uci_ptr ptr;
 532         bool istable = false;
 533         int err = UCI_ERR_MEM;
 534         char *s = NULL;
 535         int i, nargs, offset = 0;
 536
 537         ctx = find_context(L, &offset);
 538         nargs = lua_gettop(L);
 539         if (lookup_args(L, ctx, offset, &ptr, &s))
 540                 goto error;
 541
 542         switch(nargs - offset) {
 543         case 1:
 544                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 545                 break;
 546         case 4:
 547                 /* Format: uci.set("p", "s", "o", "v") */
 548                 if (lua_istable(L, nargs)) {
 549                         if (lua_objlen(L, nargs) < 1)
 550                                 luaL_error(L, "Cannot set an uci option to an empty table value");
 551                         lua_rawgeti(L, nargs, 1);
 552                         ptr.value = luaL_checkstring(L, -1);
 553                         lua_pop(L, 1);
 554                         istable = true;
 555                 } else {
 556                         ptr.value = luaL_checkstring(L, nargs);
 557                 }
 558                 break;
 559         case 3:
 560                 /* Format: uci.set("p", "s", "v") */
 561                 ptr.value = ptr.option;
 562                 ptr.option = NULL;
 563                 break;
 564         default:
 565                 err = UCI_ERR_INVAL;
 566                 goto error;
 567         }
 568
 569         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 570         if (err)
 571                 goto error;
 572
 573         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 574                 err = UCI_ERR_INVAL;
 575                 goto error;
 576         }
 577
 578         if (istable) {
 579                 if (lua_objlen(L, nargs) == 1) {
 580                         i = 1;
 581                         if (ptr.o)
 582                                 err = uci_delete(ctx, &ptr);
 583                 } else {
 584                         i = 2;
 585                         err = uci_set(ctx, &ptr);
 586                         if (err)
 587                                 goto error;
 588                 }
 589
 590                 for (; i <= lua_objlen(L, nargs); i++) {
 591                         lua_rawgeti(L, nargs, i);
 592                         ptr.value = luaL_checkstring(L, -1);
 593                         err = uci_add_list(ctx, &ptr);
 594                         lua_pop(L, 1);
 595                         if (err)
 596                                 goto error;
 597                 }
 598         } else {
 599                 err = uci_set(ctx, &ptr);
 600                 if (err)
 601                         goto error;
 602         }
 603
 604
 605 error:
 606         return uci_push_status(L, ctx, false);
 607 }
 608
 609 enum pkg_cmd {
 610         CMD_SAVE,
 611         CMD_COMMIT,
 612         CMD_REVERT
 613 };
 614
 615 static int
 616 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 617 {
 618         struct uci_context *ctx;
 619         struct uci_element *e, *tmp;
 620         struct uci_ptr ptr;
 621         char *s = NULL;
 622         int failed = 0;
 623         int nargs, offset = 0;
 624
 625         ctx = find_context(L, &offset);
 626         nargs = lua_gettop(L);
 627         if ((cmd != CMD_REVERT) && (nargs - offset > 1))
 628                 goto err;
 629
 630         if (lookup_args(L, ctx, offset, &ptr, &s))
 631                 goto err;
 632
 633         uci_lookup_ptr(ctx, &ptr, NULL, false);
 634
 635         uci_foreach_element_safe(&ctx->root, tmp, e) {
 636                 struct uci_package *p = uci_to_package(e);
 637                 int ret = UCI_ERR_INVAL;
 638
 639                 if (ptr.p && (ptr.p != p))
 640                         continue;
 641
 642                 ptr.p = p;
 643                 switch(cmd) {
 644                 case CMD_COMMIT:
 645                         ret = uci_commit(ctx, &p, false);
 646                         break;
 647                 case CMD_SAVE:
 648                         ret = uci_save(ctx, p);
 649                         break;
 650                 case CMD_REVERT:
 651                         ret = uci_revert(ctx, &ptr);
 652                         break;
 653                 }
 654
 655                 if (ret != 0)
 656                         failed = 1;
 657         }
 658
 659 err:
 660         return uci_push_status(L, ctx, false);
 661 }
 662
 663 static int
 664 uci_lua_save(lua_State *L)
 665 {
 666         return uci_lua_package_cmd(L, CMD_SAVE);
 667 }
 668
 669 static int
 670 uci_lua_commit(lua_State *L)
 671 {
 672         return uci_lua_package_cmd(L, CMD_COMMIT);
 673 }
 674
 675 static int
 676 uci_lua_revert(lua_State *L)
 677 {
 678         return uci_lua_package_cmd(L, CMD_REVERT);
 679 }
 680
 681 static void
 682 uci_lua_add_change(lua_State *L, struct uci_element *e)
 683 {
 684         struct uci_history *h;
 685         const char *name;
 686
 687         h = uci_to_history(e);
 688         if (!h->section)
 689                 return;
 690
 691         lua_getfield(L, -1, h->section);
 692         if (lua_isnil(L, -1)) {
 693                 lua_pop(L, 1);
 694                 lua_newtable(L);
 695                 lua_pushvalue(L, -1); /* copy for setfield */
 696                 lua_setfield(L, -3, h->section);
 697         }
 698
 699         name = (h->e.name ? h->e.name : ".type");
 700         if (h->value)
 701                 lua_pushstring(L, h->value);
 702         else
 703                 lua_pushstring(L, "");
 704         lua_setfield(L, -2, name);
 705         lua_pop(L, 1);
 706 }
 707
 708 static void
 709 uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
 710 {
 711         struct uci_package *p = NULL;
 712         struct uci_element *e;
 713         bool autoload = false;
 714
 715         p = find_package(L, ctx, package, false);
 716         if (!p) {
 717                 autoload = true;
 718                 p = find_package(L, ctx, package, true);
 719                 if (!p)
 720                         return;
 721         }
 722
 723         if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
 724                 goto done;
 725
 726         lua_newtable(L);
 727         uci_foreach_element(&p->saved_history, e) {
 728                 uci_lua_add_change(L, e);
 729         }
 730         uci_foreach_element(&p->history, e) {
 731                 uci_lua_add_change(L, e);
 732         }
 733         lua_setfield(L, -2, p->e.name);
 734
 735 done:
 736         if (autoload)
 737                 uci_unload(ctx, p);
 738 }
 739
 740 static int
 741 uci_lua_changes(lua_State *L)
 742 {
 743         struct uci_context *ctx;
 744         const char *package = NULL;
 745         char **config = NULL;
 746         int nargs;
 747         int i, offset = 0;
 748
 749         ctx = find_context(L, &offset);
 750         nargs = lua_gettop(L);
 751         switch(nargs - offset) {
 752         case 1:
 753                 package = luaL_checkstring(L, 1 + offset);
 754         case 0:
 755                 break;
 756         default:
 757                 luaL_error(L, "invalid argument count");
 758         }
 759
 760         lua_newtable(L);
 761         if (package) {
 762                 uci_lua_changes_pkg(L, ctx, package);
 763         } else {
 764                 if (uci_list_configs(ctx, &config) != 0)
 765                         goto done;
 766
 767                 for(i = 0; config[i] != NULL; i++) {
 768                         uci_lua_changes_pkg(L, ctx, config[i]);
 769                 }
 770         }
 771
 772 done:
 773         return 1;
 774 }
 775
 776 static int
 777 uci_lua_get_confdir(lua_State *L)
 778 {
 779         struct uci_context *ctx = find_context(L, NULL);
 780         lua_pushstring(L, ctx->confdir);
 781         return 1;
 782 }
 783
 784 static int
 785 uci_lua_set_confdir(lua_State *L)
 786 {
 787         struct uci_context *ctx;
 788         int ret, offset = 0;
 789
 790         ctx = find_context(L, &offset);
 791         luaL_checkstring(L, 1 + offset);
 792         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 793         return uci_push_status(L, ctx, false);
 794 }
 795
 796 static int
 797 uci_lua_get_savedir(lua_State *L)
 798 {
 799         struct uci_context *ctx = find_context(L, NULL);
 800         lua_pushstring(L, ctx->savedir);
 801         return 1;
 802 }
 803
 804 static int
 805 uci_lua_add_history(lua_State *L)
 806 {
 807         struct uci_context *ctx;
 808         int ret, offset = 0;
 809
 810         ctx = find_context(L, &offset);
 811         luaL_checkstring(L, 1 + offset);
 812         ret = uci_add_history_path(ctx, lua_tostring(L, -1));
 813         return uci_push_status(L, ctx, false);
 814 }
 815
 816 static int
 817 uci_lua_load_plugins(lua_State *L)
 818 {
 819         struct uci_context *ctx;
 820         int ret, offset = 0;
 821         const char *str = NULL;
 822
 823         ctx = find_context(L, &offset);
 824         if (lua_isstring(L, -1))
 825                 str = lua_tostring(L, -1);
 826         ret = uci_load_plugins(ctx, str);
 827         return uci_push_status(L, ctx, false);
 828 }
 829
 830 static int
 831 uci_lua_set_savedir(lua_State *L)
 832 {
 833         struct uci_context *ctx;
 834         int ret, offset = 0;
 835
 836         ctx = find_context(L, &offset);
 837         luaL_checkstring(L, 1 + offset);
 838         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 839         return uci_push_status(L, ctx, false);
 840 }
 841
 842 static int
 843 uci_lua_gc(lua_State *L)
 844 {
 845         struct uci_context *ctx = find_context(L, NULL);
 846         uci_free_context(ctx);
 847         return 0;
 848 }
 849
 850 static int
 851 uci_lua_cursor(lua_State *L)
 852 {
 853         struct uci_context **u;
 854         int argc = lua_gettop(L);
 855
 856         u = lua_newuserdata(L, sizeof(struct uci_context *));
 857         luaL_getmetatable(L, METANAME);
 858         lua_setmetatable(L, -2);
 859
 860         *u = uci_alloc_context();
 861         if (!*u)
 862                 luaL_error(L, "Cannot allocate UCI context");
 863         switch (argc) {
 864                 case 2:
 865                         if (lua_isstring(L, 2) &&
 866                                 (uci_set_savedir(*u, luaL_checkstring(L, 2)) != UCI_OK))
 867                                 luaL_error(L, "Unable to set savedir");
 868                         /* fall through */
 869                 case 1:
 870                         if (lua_isstring(L, 1) &&
 871                                 (uci_set_confdir(*u, luaL_checkstring(L, 1)) != UCI_OK))
 872                                 luaL_error(L, "Unable to set savedir");
 873                         break;
 874                 default:
 875                         break;
 876         }
 877         return 1;
 878 }
 879
 880 static const luaL_Reg uci[] = {
 881         { "__gc", uci_lua_gc },
 882         { "cursor", uci_lua_cursor },
 883         { "load", uci_lua_load },
 884         { "unload", uci_lua_unload },
 885         { "get", uci_lua_get },
 886         { "get_all", uci_lua_get_all },
 887         { "add", uci_lua_add },
 888         { "set", uci_lua_set },
 889         { "rename", uci_lua_rename },
 890         { "save", uci_lua_save },
 891         { "delete", uci_lua_delete },
 892         { "commit", uci_lua_commit },
 893         { "revert", uci_lua_revert },
 894         { "reorder", uci_lua_reorder },
 895         { "changes", uci_lua_changes },
 896         { "foreach", uci_lua_foreach },
 897         { "add_history", uci_lua_add_history },
 898         { "load_plugins", uci_lua_load_plugins },
 899         { "get_confdir", uci_lua_get_confdir },
 900         { "set_confdir", uci_lua_set_confdir },
 901         { "get_savedir", uci_lua_get_savedir },
 902         { "set_savedir", uci_lua_set_savedir },
 903         { NULL, NULL },
 904 };
 905
 906
 907 int
 908 luaopen_uci(lua_State *L)
 909 {
 910         /* create metatable */
 911         luaL_newmetatable(L, METANAME);
 912
 913         /* metatable.__index = metatable */
 914         lua_pushvalue(L, -1);
 915         lua_setfield(L, -2, "__index");
 916
 917         /* fill metatable */
 918         luaL_register(L, NULL, uci);
 919         lua_pop(L, 1);
 920
 921         /* create module */
 922         luaL_register(L, MODNAME, uci);
 923
 924         return 0;
 925 }