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, true) != UCI_OK)
 125                         goto error;
 126                 break;
 127         case 1:
 128                 if (uci_lookup_ptr(ctx, ptr, s, true) != 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                 else
 306                 {
 307                         lua_error(L);
 308                         break;
 309                 }
 310         }
 311
 312 done:
 313         lua_pushboolean(L, ret);
 314         return 1;
 315 }
 316
 317 static int
 318 uci_lua_get_any(lua_State *L, bool all)
 319 {
 320         struct uci_context *ctx;
 321         struct uci_element *e = NULL;
 322         struct uci_ptr ptr;
 323         int offset = 0;
 324         char *s = NULL;
 325         int err = UCI_ERR_NOTFOUND;
 326
 327         ctx = find_context(L, &offset);
 328
 329         if (lookup_args(L, ctx, offset, &ptr, &s))
 330                 goto error;
 331
 332         uci_lookup_ptr(ctx, &ptr, NULL, true);
 333         if (!all && !ptr.s) {
 334                 err = UCI_ERR_INVAL;
 335                 goto error;
 336         }
 337         if (!(ptr.flags & UCI_LOOKUP_COMPLETE)) {
 338                 err = UCI_ERR_NOTFOUND;
 339                 goto error;
 340         }
 341
 342         err = UCI_OK;
 343         e = ptr.last;
 344         switch(e->type) {
 345                 case UCI_TYPE_PACKAGE:
 346                         uci_push_package(L, ptr.p);
 347                         break;
 348                 case UCI_TYPE_SECTION:
 349                         if (all)
 350                                 uci_push_section(L, ptr.s, -1);
 351                         else
 352                                 lua_pushstring(L, ptr.s->type);
 353                         break;
 354                 case UCI_TYPE_OPTION:
 355                         uci_push_option(L, ptr.o);
 356                         break;
 357                 default:
 358                         err = UCI_ERR_INVAL;
 359                         goto error;
 360         }
 361         if (!err)
 362                 return 1;
 363
 364 error:
 365         if (s)
 366                 free(s);
 367
 368         lua_pushnil(L);
 369         return uci_push_status(L, ctx, true);
 370 }
 371
 372 static int
 373 uci_lua_get(lua_State *L)
 374 {
 375         return uci_lua_get_any(L, false);
 376 }
 377
 378 static int
 379 uci_lua_get_all(lua_State *L)
 380 {
 381         return uci_lua_get_any(L, true);
 382 }
 383
 384 static int
 385 uci_lua_add(lua_State *L)
 386 {
 387         struct uci_context *ctx;
 388         struct uci_section *s = NULL;
 389         struct uci_package *p;
 390         const char *package;
 391         const char *type;
 392         const char *name = NULL;
 393         int offset = 0;
 394
 395         ctx = find_context(L, &offset);
 396         package = luaL_checkstring(L, 1 + offset);
 397         type = luaL_checkstring(L, 2 + offset);
 398         p = find_package(L, ctx, package, true);
 399         if (!p)
 400                 goto fail;
 401
 402         if (uci_add_section(ctx, p, type, &s) || !s)
 403                 goto fail;
 404
 405         name = s->e.name;
 406         lua_pushstring(L, name);
 407         return 1;
 408
 409 fail:
 410         lua_pushnil(L);
 411         return uci_push_status(L, ctx, true);
 412 }
 413
 414 static int
 415 uci_lua_delete(lua_State *L)
 416 {
 417         struct uci_context *ctx;
 418         struct uci_ptr ptr;
 419         int offset = 0;
 420         char *s = NULL;
 421         int err = UCI_ERR_NOTFOUND;
 422
 423         ctx = find_context(L, &offset);
 424
 425         if (lookup_args(L, ctx, offset, &ptr, &s))
 426                 goto error;
 427
 428         err = uci_delete(ctx, &ptr);
 429
 430 error:
 431         if (s)
 432                 free(s);
 433         return uci_push_status(L, ctx, false);
 434 }
 435
 436 static int
 437 uci_lua_rename(lua_State *L)
 438 {
 439         struct uci_context *ctx;
 440         struct uci_ptr ptr;
 441         int err = UCI_ERR_MEM;
 442         char *s = NULL;
 443         int nargs, offset = 0;
 444
 445         ctx = find_context(L, &offset);
 446         nargs = lua_gettop(L);
 447         if (lookup_args(L, ctx, offset, &ptr, &s))
 448                 goto error;
 449
 450         switch(nargs - offset) {
 451         case 1:
 452                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 453                 break;
 454         case 4:
 455                 /* Format: uci.set("p", "s", "o", "v") */
 456                 ptr.value = luaL_checkstring(L, nargs);
 457                 break;
 458         case 3:
 459                 /* Format: uci.set("p", "s", "v") */
 460                 ptr.value = ptr.option;
 461                 ptr.option = NULL;
 462                 break;
 463         default:
 464                 err = UCI_ERR_INVAL;
 465                 goto error;
 466         }
 467
 468         err = uci_lookup_ptr(ctx, &ptr, NULL, true);
 469         if (err)
 470                 goto error;
 471
 472         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 473                 err = UCI_ERR_INVAL;
 474                 goto error;
 475         }
 476
 477         err = uci_rename(ctx, &ptr);
 478         if (err)
 479                 goto error;
 480
 481 error:
 482         return uci_push_status(L, ctx, false);
 483 }
 484
 485 static int
 486 uci_lua_reorder(lua_State *L)
 487 {
 488         struct uci_context *ctx;
 489         struct uci_ptr ptr;
 490         int err = UCI_ERR_MEM;
 491         char *s = NULL;
 492         int nargs, offset = 0;
 493
 494         ctx = find_context(L, &offset);
 495         nargs = lua_gettop(L);
 496         if (lookup_args(L, ctx, offset, &ptr, &s))
 497                 goto error;
 498
 499         switch(nargs - offset) {
 500         case 1:
 501                 /* Format: uci.set("p.s=v") or uci.set("p.s=v") */
 502                 if (ptr.option) {
 503                         err = UCI_ERR_INVAL;
 504                         goto error;
 505                 }
 506                 break;
 507         case 3:
 508                 /* Format: uci.set("p", "s", "v") */
 509                 ptr.value = ptr.option;
 510                 ptr.option = NULL;
 511                 break;
 512         default:
 513                 err = UCI_ERR_INVAL;
 514                 goto error;
 515         }
 516
 517         err = uci_lookup_ptr(ctx, &ptr, NULL, true);
 518         if (err)
 519                 goto error;
 520
 521         if ((ptr.s == NULL) || (ptr.value == NULL)) {
 522                 err = UCI_ERR_INVAL;
 523                 goto error;
 524         }
 525
 526         err = uci_reorder_section(ctx, ptr.s, strtoul(ptr.value, NULL, 10));
 527         if (err)
 528                 goto error;
 529
 530 error:
 531         return uci_push_status(L, ctx, false);
 532 }
 533
 534
 535 static int
 536 uci_lua_set(lua_State *L)
 537 {
 538         struct uci_context *ctx;
 539         struct uci_ptr ptr;
 540         bool istable = false;
 541         int err = UCI_ERR_MEM;
 542         char *s = NULL;
 543         int i, nargs, offset = 0;
 544
 545         ctx = find_context(L, &offset);
 546         nargs = lua_gettop(L);
 547         if (lookup_args(L, ctx, offset, &ptr, &s))
 548                 goto error;
 549
 550         switch(nargs - offset) {
 551         case 1:
 552                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 553                 break;
 554         case 4:
 555                 /* Format: uci.set("p", "s", "o", "v") */
 556                 if (lua_istable(L, nargs)) {
 557                         if (lua_objlen(L, nargs) < 1)
 558                                 luaL_error(L, "Cannot set an uci option to an empty table value");
 559                         lua_rawgeti(L, nargs, 1);
 560                         ptr.value = luaL_checkstring(L, -1);
 561                         lua_pop(L, 1);
 562                         istable = true;
 563                 } else {
 564                         ptr.value = luaL_checkstring(L, nargs);
 565                 }
 566                 break;
 567         case 3:
 568                 /* Format: uci.set("p", "s", "v") */
 569                 ptr.value = ptr.option;
 570                 ptr.option = NULL;
 571                 break;
 572         default:
 573                 err = UCI_ERR_INVAL;
 574                 goto error;
 575         }
 576
 577         err = uci_lookup_ptr(ctx, &ptr, NULL, true);
 578         if (err)
 579                 goto error;
 580
 581         if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
 582                 err = UCI_ERR_INVAL;
 583                 goto error;
 584         }
 585
 586         if (istable) {
 587                 if (lua_objlen(L, nargs) == 1) {
 588                         i = 1;
 589                         if (ptr.o)
 590                                 err = uci_delete(ctx, &ptr);
 591                 } else {
 592                         i = 2;
 593                         err = uci_set(ctx, &ptr);
 594                         if (err)
 595                                 goto error;
 596                 }
 597
 598                 for (; i <= lua_objlen(L, nargs); i++) {
 599                         lua_rawgeti(L, nargs, i);
 600                         ptr.value = luaL_checkstring(L, -1);
 601                         err = uci_add_list(ctx, &ptr);
 602                         lua_pop(L, 1);
 603                         if (err)
 604                                 goto error;
 605                 }
 606         } else {
 607                 err = uci_set(ctx, &ptr);
 608                 if (err)
 609                         goto error;
 610         }
 611
 612
 613 error:
 614         return uci_push_status(L, ctx, false);
 615 }
 616
 617 enum pkg_cmd {
 618         CMD_SAVE,
 619         CMD_COMMIT,
 620         CMD_REVERT
 621 };
 622
 623 static int
 624 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 625 {
 626         struct uci_context *ctx;
 627         struct uci_element *e, *tmp;
 628         struct uci_ptr ptr;
 629         char *s = NULL;
 630         int failed = 0;
 631         int nargs, offset = 0;
 632
 633         ctx = find_context(L, &offset);
 634         nargs = lua_gettop(L);
 635         if ((cmd != CMD_REVERT) && (nargs - offset > 1))
 636                 goto err;
 637
 638         if (lookup_args(L, ctx, offset, &ptr, &s))
 639                 goto err;
 640
 641         uci_lookup_ptr(ctx, &ptr, NULL, true);
 642
 643         uci_foreach_element_safe(&ctx->root, tmp, e) {
 644                 struct uci_package *p = uci_to_package(e);
 645                 int ret = UCI_ERR_INVAL;
 646
 647                 if (ptr.p && (ptr.p != p))
 648                         continue;
 649
 650                 ptr.p = p;
 651                 switch(cmd) {
 652                 case CMD_COMMIT:
 653                         ret = uci_commit(ctx, &p, false);
 654                         break;
 655                 case CMD_SAVE:
 656                         ret = uci_save(ctx, p);
 657                         break;
 658                 case CMD_REVERT:
 659                         ret = uci_revert(ctx, &ptr);
 660                         break;
 661                 }
 662
 663                 if (ret != 0)
 664                         failed = 1;
 665         }
 666
 667 err:
 668         return uci_push_status(L, ctx, false);
 669 }
 670
 671 static int
 672 uci_lua_save(lua_State *L)
 673 {
 674         return uci_lua_package_cmd(L, CMD_SAVE);
 675 }
 676
 677 static int
 678 uci_lua_commit(lua_State *L)
 679 {
 680         return uci_lua_package_cmd(L, CMD_COMMIT);
 681 }
 682
 683 static int
 684 uci_lua_revert(lua_State *L)
 685 {
 686         return uci_lua_package_cmd(L, CMD_REVERT);
 687 }
 688
 689 static void
 690 uci_lua_add_change(lua_State *L, struct uci_element *e)
 691 {
 692         struct uci_history *h;
 693         const char *name;
 694
 695         h = uci_to_history(e);
 696         if (!h->section)
 697                 return;
 698
 699         lua_getfield(L, -1, h->section);
 700         if (lua_isnil(L, -1)) {
 701                 lua_pop(L, 1);
 702                 lua_newtable(L);
 703                 lua_pushvalue(L, -1); /* copy for setfield */
 704                 lua_setfield(L, -3, h->section);
 705         }
 706
 707         name = (h->e.name ? h->e.name : ".type");
 708         if (h->value)
 709                 lua_pushstring(L, h->value);
 710         else
 711                 lua_pushstring(L, "");
 712         lua_setfield(L, -2, name);
 713         lua_pop(L, 1);
 714 }
 715
 716 static void
 717 uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
 718 {
 719         struct uci_package *p = NULL;
 720         struct uci_element *e;
 721         bool autoload = false;
 722
 723         p = find_package(L, ctx, package, false);
 724         if (!p) {
 725                 autoload = true;
 726                 p = find_package(L, ctx, package, true);
 727                 if (!p)
 728                         return;
 729         }
 730
 731         if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
 732                 goto done;
 733
 734         lua_newtable(L);
 735         uci_foreach_element(&p->saved_history, e) {
 736                 uci_lua_add_change(L, e);
 737         }
 738         uci_foreach_element(&p->history, e) {
 739                 uci_lua_add_change(L, e);
 740         }
 741         lua_setfield(L, -2, p->e.name);
 742
 743 done:
 744         if (autoload)
 745                 uci_unload(ctx, p);
 746 }
 747
 748 static int
 749 uci_lua_changes(lua_State *L)
 750 {
 751         struct uci_context *ctx;
 752         const char *package = NULL;
 753         char **config = NULL;
 754         int nargs;
 755         int i, offset = 0;
 756
 757         ctx = find_context(L, &offset);
 758         nargs = lua_gettop(L);
 759         switch(nargs - offset) {
 760         case 1:
 761                 package = luaL_checkstring(L, 1 + offset);
 762         case 0:
 763                 break;
 764         default:
 765                 luaL_error(L, "invalid argument count");
 766         }
 767
 768         lua_newtable(L);
 769         if (package) {
 770                 uci_lua_changes_pkg(L, ctx, package);
 771         } else {
 772                 if (uci_list_configs(ctx, &config) != 0)
 773                         goto done;
 774
 775                 for(i = 0; config[i] != NULL; i++) {
 776                         uci_lua_changes_pkg(L, ctx, config[i]);
 777                 }
 778         }
 779
 780 done:
 781         return 1;
 782 }
 783
 784 static int
 785 uci_lua_get_confdir(lua_State *L)
 786 {
 787         struct uci_context *ctx = find_context(L, NULL);
 788         lua_pushstring(L, ctx->confdir);
 789         return 1;
 790 }
 791
 792 static int
 793 uci_lua_set_confdir(lua_State *L)
 794 {
 795         struct uci_context *ctx;
 796         int ret, offset = 0;
 797
 798         ctx = find_context(L, &offset);
 799         luaL_checkstring(L, 1 + offset);
 800         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 801         return uci_push_status(L, ctx, false);
 802 }
 803
 804 static int
 805 uci_lua_get_savedir(lua_State *L)
 806 {
 807         struct uci_context *ctx = find_context(L, NULL);
 808         lua_pushstring(L, ctx->savedir);
 809         return 1;
 810 }
 811
 812 static int
 813 uci_lua_add_history(lua_State *L)
 814 {
 815         struct uci_context *ctx;
 816         int ret, offset = 0;
 817
 818         ctx = find_context(L, &offset);
 819         luaL_checkstring(L, 1 + offset);
 820         ret = uci_add_history_path(ctx, lua_tostring(L, -1));
 821         return uci_push_status(L, ctx, false);
 822 }
 823
 824 static int
 825 uci_lua_load_plugins(lua_State *L)
 826 {
 827         struct uci_context *ctx;
 828         int ret, offset = 0;
 829         const char *str = NULL;
 830
 831         ctx = find_context(L, &offset);
 832         if (lua_isstring(L, -1))
 833                 str = lua_tostring(L, -1);
 834         ret = uci_load_plugins(ctx, str);
 835         return uci_push_status(L, ctx, false);
 836 }
 837
 838 static int
 839 uci_lua_set_savedir(lua_State *L)
 840 {
 841         struct uci_context *ctx;
 842         int ret, offset = 0;
 843
 844         ctx = find_context(L, &offset);
 845         luaL_checkstring(L, 1 + offset);
 846         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 847         return uci_push_status(L, ctx, false);
 848 }
 849
 850 static int
 851 uci_lua_gc(lua_State *L)
 852 {
 853         struct uci_context *ctx = find_context(L, NULL);
 854         uci_free_context(ctx);
 855         return 0;
 856 }
 857
 858 static int
 859 uci_lua_cursor(lua_State *L)
 860 {
 861         struct uci_context **u;
 862         int argc = lua_gettop(L);
 863
 864         u = lua_newuserdata(L, sizeof(struct uci_context *));
 865         luaL_getmetatable(L, METANAME);
 866         lua_setmetatable(L, -2);
 867
 868         *u = uci_alloc_context();
 869         if (!*u)
 870                 luaL_error(L, "Cannot allocate UCI context");
 871         switch (argc) {
 872                 case 2:
 873                         if (lua_isstring(L, 2) &&
 874                                 (uci_set_savedir(*u, luaL_checkstring(L, 2)) != UCI_OK))
 875                                 luaL_error(L, "Unable to set savedir");
 876                         /* fall through */
 877                 case 1:
 878                         if (lua_isstring(L, 1) &&
 879                                 (uci_set_confdir(*u, luaL_checkstring(L, 1)) != UCI_OK))
 880                                 luaL_error(L, "Unable to set savedir");
 881                         break;
 882                 default:
 883                         break;
 884         }
 885         return 1;
 886 }
 887
 888 static const luaL_Reg uci[] = {
 889         { "__gc", uci_lua_gc },
 890         { "cursor", uci_lua_cursor },
 891         { "load", uci_lua_load },
 892         { "unload", uci_lua_unload },
 893         { "get", uci_lua_get },
 894         { "get_all", uci_lua_get_all },
 895         { "add", uci_lua_add },
 896         { "set", uci_lua_set },
 897         { "rename", uci_lua_rename },
 898         { "save", uci_lua_save },
 899         { "delete", uci_lua_delete },
 900         { "commit", uci_lua_commit },
 901         { "revert", uci_lua_revert },
 902         { "reorder", uci_lua_reorder },
 903         { "changes", uci_lua_changes },
 904         { "foreach", uci_lua_foreach },
 905         { "add_history", uci_lua_add_history },
 906         { "load_plugins", uci_lua_load_plugins },
 907         { "get_confdir", uci_lua_get_confdir },
 908         { "set_confdir", uci_lua_set_confdir },
 909         { "get_savedir", uci_lua_get_savedir },
 910         { "set_savedir", uci_lua_set_savedir },
 911         { NULL, NULL },
 912 };
 913
 914
 915 int
 916 luaopen_uci(lua_State *L)
 917 {
 918         /* create metatable */
 919         luaL_newmetatable(L, METANAME);
 920
 921         /* metatable.__index = metatable */
 922         lua_pushvalue(L, -1);
 923         lua_setfield(L, -2, "__index");
 924
 925         /* fill metatable */
 926         luaL_register(L, NULL, uci);
 927         lua_pop(L, 1);
 928
 929         /* create module */
 930         luaL_register(L, MODNAME, uci);
 931
 932         return 0;
 933 }