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, 1, 0) == 0) {
 301                         ret = true;
 302                         if (lua_isboolean(L, -1) && !lua_toboolean(L, -1))
 303                                 break;
 304                 }
 305         }
 306
 307 done:
 308         lua_pushboolean(L, ret);
 309         return 1;
 310 }
 311
 312 static int
 313 uci_lua_get_any(lua_State *L, bool all)
 314 {
 315         struct uci_context *ctx;
 316         struct uci_element *e = NULL;
 317         struct uci_ptr ptr;
 318         int offset = 0;
 319         char *s = NULL;
 320         int err = UCI_ERR_NOTFOUND;
 321
 322         ctx = find_context(L, &offset);
 323
 324         if (lookup_args(L, ctx, offset, &ptr, &s))
 325                 goto error;
 326
 327         uci_lookup_ptr(ctx, &ptr, NULL, false);
 328         if (!all && !ptr.s) {
 329                 err = UCI_ERR_INVAL;
 330                 goto error;
 331         }
 332         if (!(ptr.flags & UCI_LOOKUP_COMPLETE)) {
 333                 err = UCI_ERR_NOTFOUND;
 334                 goto error;
 335         }
 336
 337         err = UCI_OK;
 338         e = ptr.last;
 339         switch(e->type) {
 340                 case UCI_TYPE_PACKAGE:
 341                         uci_push_package(L, ptr.p);
 342                         break;
 343                 case UCI_TYPE_SECTION:
 344                         if (all)
 345                                 uci_push_section(L, ptr.s, -1);
 346                         else
 347                                 lua_pushstring(L, ptr.s->type);
 348                         break;
 349                 case UCI_TYPE_OPTION:
 350                         uci_push_option(L, ptr.o);
 351                         break;
 352                 default:
 353                         err = UCI_ERR_INVAL;
 354                         goto error;
 355         }
 356         if (!err)
 357                 return 1;
 358
 359 error:
 360         if (s)
 361                 free(s);
 362
 363         lua_pushnil(L);
 364         return uci_push_status(L, ctx, true);
 365 }
 366
 367 static int
 368 uci_lua_get(lua_State *L)
 369 {
 370         return uci_lua_get_any(L, false);
 371 }
 372
 373 static int
 374 uci_lua_get_all(lua_State *L)
 375 {
 376         return uci_lua_get_any(L, true);
 377 }
 378
 379 static int
 380 uci_lua_add(lua_State *L)
 381 {
 382         struct uci_context *ctx;
 383         struct uci_section *s = NULL;
 384         struct uci_package *p;
 385         const char *package;
 386         const char *type;
 387         const char *name = NULL;
 388         int offset = 0;
 389
 390         ctx = find_context(L, &offset);
 391         package = luaL_checkstring(L, 1 + offset);
 392         type = luaL_checkstring(L, 2 + offset);
 393         p = find_package(L, ctx, package, true);
 394         if (!p)
 395                 goto fail;
 396
 397         if (uci_add_section(ctx, p, type, &s) || !s)
 398                 goto fail;
 399
 400         name = s->e.name;
 401         lua_pushstring(L, name);
 402         return 1;
 403
 404 fail:
 405         lua_pushnil(L);
 406         return uci_push_status(L, ctx, true);
 407 }
 408
 409 static int
 410 uci_lua_delete(lua_State *L)
 411 {
 412         struct uci_context *ctx;
 413         struct uci_ptr ptr;
 414         int offset = 0;
 415         char *s = NULL;
 416         int err = UCI_ERR_NOTFOUND;
 417
 418         ctx = find_context(L, &offset);
 419
 420         if (lookup_args(L, ctx, offset, &ptr, &s))
 421                 goto error;
 422
 423         err = uci_delete(ctx, &ptr);
 424
 425 error:
 426         if (s)
 427                 free(s);
 428         return uci_push_status(L, ctx, false);
 429 }
 430
 431 static int
 432 uci_lua_rename(lua_State *L)
 433 {
 434         struct uci_context *ctx;
 435         struct uci_ptr ptr;
 436         int err = UCI_ERR_MEM;
 437         char *s = NULL;
 438         int nargs, offset = 0;
 439
 440         ctx = find_context(L, &offset);
 441         nargs = lua_gettop(L);
 442         if (lookup_args(L, ctx, offset, &ptr, &s))
 443                 goto error;
 444
 445         switch(nargs - offset) {
 446         case 1:
 447                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 448                 break;
 449         case 4:
 450                 /* Format: uci.set("p", "s", "o", "v") */
 451                 ptr.value = luaL_checkstring(L, nargs);
 452                 break;
 453         case 3:
 454                 /* Format: uci.set("p", "s", "v") */
 455                 ptr.value = ptr.option;
 456                 ptr.option = NULL;
 457                 break;
 458         default:
 459                 err = UCI_ERR_INVAL;
 460                 goto error;
 461         }
 462
 463         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 464         if (err)
 465                 goto error;
 466
 467         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 468                 err = UCI_ERR_INVAL;
 469                 goto error;
 470         }
 471
 472         err = uci_rename(ctx, &ptr);
 473         if (err)
 474                 goto error;
 475
 476 error:
 477         return uci_push_status(L, ctx, false);
 478 }
 479
 480 static int
 481 uci_lua_reorder(lua_State *L)
 482 {
 483         struct uci_context *ctx;
 484         struct uci_ptr ptr;
 485         int err = UCI_ERR_MEM;
 486         char *s = NULL;
 487         int nargs, offset = 0;
 488
 489         ctx = find_context(L, &offset);
 490         nargs = lua_gettop(L);
 491         if (lookup_args(L, ctx, offset, &ptr, &s))
 492                 goto error;
 493
 494         switch(nargs - offset) {
 495         case 1:
 496                 /* Format: uci.set("p.s=v") or uci.set("p.s=v") */
 497                 if (ptr.option) {
 498                         err = UCI_ERR_INVAL;
 499                         goto error;
 500                 }
 501                 break;
 502         case 3:
 503                 /* Format: uci.set("p", "s", "v") */
 504                 ptr.value = ptr.option;
 505                 ptr.option = NULL;
 506                 break;
 507         default:
 508                 err = UCI_ERR_INVAL;
 509                 goto error;
 510         }
 511
 512         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 513         if (err)
 514                 goto error;
 515
 516         if ((ptr.s == NULL) || (ptr.value == NULL)) {
 517                 err = UCI_ERR_INVAL;
 518                 goto error;
 519         }
 520
 521         err = uci_reorder_section(ctx, ptr.s, strtoul(ptr.value, NULL, 10));
 522         if (err)
 523                 goto error;
 524
 525 error:
 526         return uci_push_status(L, ctx, false);
 527 }
 528
 529
 530 static int
 531 uci_lua_set(lua_State *L)
 532 {
 533         struct uci_context *ctx;
 534         struct uci_ptr ptr;
 535         bool istable = false;
 536         int err = UCI_ERR_MEM;
 537         char *s = NULL;
 538         int i, nargs, offset = 0;
 539
 540         ctx = find_context(L, &offset);
 541         nargs = lua_gettop(L);
 542         if (lookup_args(L, ctx, offset, &ptr, &s))
 543                 goto error;
 544
 545         switch(nargs - offset) {
 546         case 1:
 547                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 548                 break;
 549         case 4:
 550                 /* Format: uci.set("p", "s", "o", "v") */
 551                 if (lua_istable(L, nargs)) {
 552                         if (lua_objlen(L, nargs) < 1)
 553                                 luaL_error(L, "Cannot set an uci option to an empty table value");
 554                         lua_rawgeti(L, nargs, 1);
 555                         ptr.value = luaL_checkstring(L, -1);
 556                         lua_pop(L, 1);
 557                         istable = true;
 558                 } else {
 559                         ptr.value = luaL_checkstring(L, nargs);
 560                 }
 561                 break;
 562         case 3:
 563                 /* Format: uci.set("p", "s", "v") */
 564                 ptr.value = ptr.option;
 565                 ptr.option = NULL;
 566                 break;
 567         default:
 568                 err = UCI_ERR_INVAL;
 569                 goto error;
 570         }
 571
 572         err = uci_lookup_ptr(ctx, &ptr, NULL, false);
 573         if (err)
 574                 goto error;
 575
 576         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 577                 err = UCI_ERR_INVAL;
 578                 goto error;
 579         }
 580
 581         if (istable) {
 582                 if (lua_objlen(L, nargs) == 1) {
 583                         i = 1;
 584                         if (ptr.o)
 585                                 err = uci_delete(ctx, &ptr);
 586                 } else {
 587                         i = 2;
 588                         err = uci_set(ctx, &ptr);
 589                         if (err)
 590                                 goto error;
 591                 }
 592
 593                 for (; i <= lua_objlen(L, nargs); i++) {
 594                         lua_rawgeti(L, nargs, i);
 595                         ptr.value = luaL_checkstring(L, -1);
 596                         err = uci_add_list(ctx, &ptr);
 597                         lua_pop(L, 1);
 598                         if (err)
 599                                 goto error;
 600                 }
 601         } else {
 602                 err = uci_set(ctx, &ptr);
 603                 if (err)
 604                         goto error;
 605         }
 606
 607
 608 error:
 609         return uci_push_status(L, ctx, false);
 610 }
 611
 612 enum pkg_cmd {
 613         CMD_SAVE,
 614         CMD_COMMIT,
 615         CMD_REVERT
 616 };
 617
 618 static int
 619 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 620 {
 621         struct uci_context *ctx;
 622         struct uci_element *e, *tmp;
 623         struct uci_ptr ptr;
 624         char *s = NULL;
 625         int failed = 0;
 626         int nargs, offset = 0;
 627
 628         ctx = find_context(L, &offset);
 629         nargs = lua_gettop(L);
 630         if ((cmd != CMD_REVERT) && (nargs - offset > 1))
 631                 goto err;
 632
 633         if (lookup_args(L, ctx, offset, &ptr, &s))
 634                 goto err;
 635
 636         uci_lookup_ptr(ctx, &ptr, NULL, false);
 637
 638         uci_foreach_element_safe(&ctx->root, tmp, e) {
 639                 struct uci_package *p = uci_to_package(e);
 640                 int ret = UCI_ERR_INVAL;
 641
 642                 if (ptr.p && (ptr.p != p))
 643                         continue;
 644
 645                 ptr.p = p;
 646                 switch(cmd) {
 647                 case CMD_COMMIT:
 648                         ret = uci_commit(ctx, &p, false);
 649                         break;
 650                 case CMD_SAVE:
 651                         ret = uci_save(ctx, p);
 652                         break;
 653                 case CMD_REVERT:
 654                         ret = uci_revert(ctx, &ptr);
 655                         break;
 656                 }
 657
 658                 if (ret != 0)
 659                         failed = 1;
 660         }
 661
 662 err:
 663         return uci_push_status(L, ctx, false);
 664 }
 665
 666 static int
 667 uci_lua_save(lua_State *L)
 668 {
 669         return uci_lua_package_cmd(L, CMD_SAVE);
 670 }
 671
 672 static int
 673 uci_lua_commit(lua_State *L)
 674 {
 675         return uci_lua_package_cmd(L, CMD_COMMIT);
 676 }
 677
 678 static int
 679 uci_lua_revert(lua_State *L)
 680 {
 681         return uci_lua_package_cmd(L, CMD_REVERT);
 682 }
 683
 684 static void
 685 uci_lua_add_change(lua_State *L, struct uci_element *e)
 686 {
 687         struct uci_history *h;
 688         const char *name;
 689
 690         h = uci_to_history(e);
 691         if (!h->section)
 692                 return;
 693
 694         lua_getfield(L, -1, h->section);
 695         if (lua_isnil(L, -1)) {
 696                 lua_pop(L, 1);
 697                 lua_newtable(L);
 698                 lua_pushvalue(L, -1); /* copy for setfield */
 699                 lua_setfield(L, -3, h->section);
 700         }
 701
 702         name = (h->e.name ? h->e.name : ".type");
 703         if (h->value)
 704                 lua_pushstring(L, h->value);
 705         else
 706                 lua_pushstring(L, "");
 707         lua_setfield(L, -2, name);
 708         lua_pop(L, 1);
 709 }
 710
 711 static void
 712 uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
 713 {
 714         struct uci_package *p = NULL;
 715         struct uci_element *e;
 716         bool autoload = false;
 717
 718         p = find_package(L, ctx, package, false);
 719         if (!p) {
 720                 autoload = true;
 721                 p = find_package(L, ctx, package, true);
 722                 if (!p)
 723                         return;
 724         }
 725
 726         if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
 727                 goto done;
 728
 729         lua_newtable(L);
 730         uci_foreach_element(&p->saved_history, e) {
 731                 uci_lua_add_change(L, e);
 732         }
 733         uci_foreach_element(&p->history, e) {
 734                 uci_lua_add_change(L, e);
 735         }
 736         lua_setfield(L, -2, p->e.name);
 737
 738 done:
 739         if (autoload)
 740                 uci_unload(ctx, p);
 741 }
 742
 743 static int
 744 uci_lua_changes(lua_State *L)
 745 {
 746         struct uci_context *ctx;
 747         const char *package = NULL;
 748         char **config = NULL;
 749         int nargs;
 750         int i, offset = 0;
 751
 752         ctx = find_context(L, &offset);
 753         nargs = lua_gettop(L);
 754         switch(nargs - offset) {
 755         case 1:
 756                 package = luaL_checkstring(L, 1 + offset);
 757         case 0:
 758                 break;
 759         default:
 760                 luaL_error(L, "invalid argument count");
 761         }
 762
 763         lua_newtable(L);
 764         if (package) {
 765                 uci_lua_changes_pkg(L, ctx, package);
 766         } else {
 767                 if (uci_list_configs(ctx, &config) != 0)
 768                         goto done;
 769
 770                 for(i = 0; config[i] != NULL; i++) {
 771                         uci_lua_changes_pkg(L, ctx, config[i]);
 772                 }
 773         }
 774
 775 done:
 776         return 1;
 777 }
 778
 779 static int
 780 uci_lua_get_confdir(lua_State *L)
 781 {
 782         struct uci_context *ctx = find_context(L, NULL);
 783         lua_pushstring(L, ctx->confdir);
 784         return 1;
 785 }
 786
 787 static int
 788 uci_lua_set_confdir(lua_State *L)
 789 {
 790         struct uci_context *ctx;
 791         int ret, offset = 0;
 792
 793         ctx = find_context(L, &offset);
 794         luaL_checkstring(L, 1 + offset);
 795         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 796         return uci_push_status(L, ctx, false);
 797 }
 798
 799 static int
 800 uci_lua_get_savedir(lua_State *L)
 801 {
 802         struct uci_context *ctx = find_context(L, NULL);
 803         lua_pushstring(L, ctx->savedir);
 804         return 1;
 805 }
 806
 807 static int
 808 uci_lua_add_history(lua_State *L)
 809 {
 810         struct uci_context *ctx;
 811         int ret, offset = 0;
 812
 813         ctx = find_context(L, &offset);
 814         luaL_checkstring(L, 1 + offset);
 815         ret = uci_add_history_path(ctx, lua_tostring(L, -1));
 816         return uci_push_status(L, ctx, false);
 817 }
 818
 819 static int
 820 uci_lua_load_plugins(lua_State *L)
 821 {
 822         struct uci_context *ctx;
 823         int ret, offset = 0;
 824         const char *str = NULL;
 825
 826         ctx = find_context(L, &offset);
 827         if (lua_isstring(L, -1))
 828                 str = lua_tostring(L, -1);
 829         ret = uci_load_plugins(ctx, str);
 830         return uci_push_status(L, ctx, false);
 831 }
 832
 833 static int
 834 uci_lua_set_savedir(lua_State *L)
 835 {
 836         struct uci_context *ctx;
 837         int ret, offset = 0;
 838
 839         ctx = find_context(L, &offset);
 840         luaL_checkstring(L, 1 + offset);
 841         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 842         return uci_push_status(L, ctx, false);
 843 }
 844
 845 static int
 846 uci_lua_gc(lua_State *L)
 847 {
 848         struct uci_context *ctx = find_context(L, NULL);
 849         uci_free_context(ctx);
 850         return 0;
 851 }
 852
 853 static int
 854 uci_lua_cursor(lua_State *L)
 855 {
 856         struct uci_context **u;
 857         int argc = lua_gettop(L);
 858
 859         u = lua_newuserdata(L, sizeof(struct uci_context *));
 860         luaL_getmetatable(L, METANAME);
 861         lua_setmetatable(L, -2);
 862
 863         *u = uci_alloc_context();
 864         if (!*u)
 865                 luaL_error(L, "Cannot allocate UCI context");
 866         switch (argc) {
 867                 case 2:
 868                         if (lua_isstring(L, 2) &&
 869                                 (uci_set_savedir(*u, luaL_checkstring(L, 2)) != UCI_OK))
 870                                 luaL_error(L, "Unable to set savedir");
 871                         /* fall through */
 872                 case 1:
 873                         if (lua_isstring(L, 1) &&
 874                                 (uci_set_confdir(*u, luaL_checkstring(L, 1)) != UCI_OK))
 875                                 luaL_error(L, "Unable to set savedir");
 876                         break;
 877                 default:
 878                         break;
 879         }
 880         return 1;
 881 }
 882
 883 static const luaL_Reg uci[] = {
 884         { "__gc", uci_lua_gc },
 885         { "cursor", uci_lua_cursor },
 886         { "load", uci_lua_load },
 887         { "unload", uci_lua_unload },
 888         { "get", uci_lua_get },
 889         { "get_all", uci_lua_get_all },
 890         { "add", uci_lua_add },
 891         { "set", uci_lua_set },
 892         { "rename", uci_lua_rename },
 893         { "save", uci_lua_save },
 894         { "delete", uci_lua_delete },
 895         { "commit", uci_lua_commit },
 896         { "revert", uci_lua_revert },
 897         { "reorder", uci_lua_reorder },
 898         { "changes", uci_lua_changes },
 899         { "foreach", uci_lua_foreach },
 900         { "add_history", uci_lua_add_history },
 901         { "load_plugins", uci_lua_load_plugins },
 902         { "get_confdir", uci_lua_get_confdir },
 903         { "set_confdir", uci_lua_set_confdir },
 904         { "get_savedir", uci_lua_get_savedir },
 905         { "set_savedir", uci_lua_set_savedir },
 906         { NULL, NULL },
 907 };
 908
 909
 910 int
 911 luaopen_uci(lua_State *L)
 912 {
 913         /* create metatable */
 914         luaL_newmetatable(L, METANAME);
 915
 916         /* metatable.__index = metatable */
 917         lua_pushvalue(L, -1);
 918         lua_setfield(L, -2, "__index");
 919
 920         /* fill metatable */
 921         luaL_register(L, NULL, uci);
 922         lua_pop(L, 1);
 923
 924         /* create module */
 925         luaL_register(L, MODNAME, uci);
 926
 927         return 0;
 928 }