file.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * this program is free software; you can redistribute it and/or modify
   6  * it under the terms of the gnu lesser general public license version 2.1
   7  * as published by the free software foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 /*
  16  * This file contains the code for parsing uci config files
  17  */
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <stdbool.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <stdio.h>
  25 #include <ctype.h>
  26
  27 #define LINEBUF 32
  28 #define LINEBUF_MAX     4096
  29
  30 static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
  31 {
  32         struct uci_parse_context *pctx = ctx->pctx;
  33
  34         pctx->reason = reason;
  35         pctx->byte = pos - pctx->buf;
  36         UCI_THROW(ctx, UCI_ERR_PARSE);
  37 }
  38
  39 /*
  40  * Fetch a new line from the input stream and resize buffer if necessary
  41  */
  42 static void uci_getln(struct uci_context *ctx, int offset)
  43 {
  44         struct uci_parse_context *pctx = ctx->pctx;
  45         char *p;
  46         int ofs;
  47
  48         if (pctx->buf == NULL) {
  49                 pctx->buf = uci_malloc(ctx, LINEBUF);
  50                 pctx->bufsz = LINEBUF;
  51         }
  52
  53         ofs = offset;
  54         do {
  55                 p = &pctx->buf[ofs];
  56                 p[ofs] = 0;
  57
  58                 p = fgets(p, pctx->bufsz - ofs, pctx->file);
  59                 if (!p || !*p)
  60                         return;
  61
  62                 ofs += strlen(p);
  63                 if (pctx->buf[ofs - 1] == '\n') {
  64                         pctx->line++;
  65                         pctx->buf[ofs - 1] = 0;
  66                         return;
  67                 }
  68
  69                 if (pctx->bufsz > LINEBUF_MAX/2)
  70                         uci_parse_error(ctx, p, "line too long");
  71
  72                 pctx->bufsz *= 2;
  73                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  74         } while (1);
  75 }
  76
  77 /*
  78  * Clean up all extra memory used by the parser and exporter
  79  */
  80 static void uci_file_cleanup(struct uci_context *ctx)
  81 {
  82         struct uci_parse_context *pctx;
  83
  84         if (ctx->buf) {
  85                 free(ctx->buf);
  86                 ctx->buf = NULL;
  87                 ctx->bufsz = 0;
  88         }
  89
  90         pctx = ctx->pctx;
  91         if (!pctx)
  92                 return;
  93
  94         ctx->pctx = NULL;
  95         if (pctx->package)
  96                 uci_free_package(pctx->package);
  97
  98         if (pctx->buf)
  99                 free(pctx->buf);
 100
 101         free(pctx);
 102 }
 103
 104 /*
 105  * parse a character escaped by '\'
 106  * returns true if the escaped character is to be parsed
 107  * returns false if the escaped character is to be ignored
 108  */
 109 static inline bool parse_backslash(struct uci_context *ctx, char **str)
 110 {
 111         /* skip backslash */
 112         *str += 1;
 113
 114         /* undecoded backslash at the end of line, fetch the next line */
 115         if (!**str) {
 116                 *str += 1;
 117                 uci_getln(ctx, *str - ctx->pctx->buf);
 118                 return false;
 119         }
 120
 121         /* FIXME: decode escaped char, necessary? */
 122         return true;
 123 }
 124
 125 /*
 126  * move the string pointer forward until a non-whitespace character or
 127  * EOL is reached
 128  */
 129 static void skip_whitespace(struct uci_context *ctx, char **str)
 130 {
 131 restart:
 132         while (**str && isspace(**str))
 133                 *str += 1;
 134
 135         if (**str == '\\') {
 136                 if (!parse_backslash(ctx, str))
 137                         goto restart;
 138         }
 139 }
 140
 141 static inline void addc(char **dest, char **src)
 142 {
 143         **dest = **src;
 144         *dest += 1;
 145         *src += 1;
 146 }
 147
 148 /*
 149  * parse a double quoted string argument from the command line
 150  */
 151 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
 152 {
 153         char c;
 154
 155         /* skip quote character */
 156         *str += 1;
 157
 158         while ((c = **str)) {
 159                 switch(c) {
 160                 case '"':
 161                         **target = 0;
 162                         *str += 1;
 163                         return;
 164                 case '\\':
 165                         if (!parse_backslash(ctx, str))
 166                                 continue;
 167                         /* fall through */
 168                 default:
 169                         addc(target, str);
 170                         break;
 171                 }
 172         }
 173         uci_parse_error(ctx, *str, "unterminated \"");
 174 }
 175
 176 /*
 177  * parse a single quoted string argument from the command line
 178  */
 179 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
 180 {
 181         char c;
 182         /* skip quote character */
 183         *str += 1;
 184
 185         while ((c = **str)) {
 186                 switch(c) {
 187                 case '\'':
 188                         **target = 0;
 189                         *str += 1;
 190                         return;
 191                 default:
 192                         addc(target, str);
 193                 }
 194         }
 195         uci_parse_error(ctx, *str, "unterminated '");
 196 }
 197
 198 /*
 199  * parse a string from the command line and detect the quoting style
 200  */
 201 static void parse_str(struct uci_context *ctx, char **str, char **target)
 202 {
 203         do {
 204                 switch(**str) {
 205                 case '\'':
 206                         parse_single_quote(ctx, str, target);
 207                         break;
 208                 case '"':
 209                         parse_double_quote(ctx, str, target);
 210                         break;
 211                 case 0:
 212                         goto done;
 213                 case '\\':
 214                         if (!parse_backslash(ctx, str))
 215                                 continue;
 216                         /* fall through */
 217                 default:
 218                         addc(target, str);
 219                         break;
 220                 }
 221         } while (**str && !isspace(**str));
 222 done:
 223
 224         /*
 225          * if the string was unquoted and we've stopped at a whitespace
 226          * character, skip to the next one, because the whitespace will
 227          * be overwritten by a null byte here
 228          */
 229         if (**str)
 230                 *str += 1;
 231
 232         /* terminate the parsed string */
 233         **target = 0;
 234 }
 235
 236 /*
 237  * extract the next argument from the command line
 238  */
 239 static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
 240 {
 241         char *val;
 242         char *ptr;
 243
 244         val = ptr = *str;
 245         skip_whitespace(ctx, str);
 246         parse_str(ctx, str, &ptr);
 247         if (required && !*val)
 248                 uci_parse_error(ctx, *str, "insufficient arguments");
 249         if (name && !uci_validate_name(val))
 250                 uci_parse_error(ctx, val, "invalid character in field");
 251
 252         return val;
 253 }
 254
 255 /*
 256  * verify that the end of the line or command is reached.
 257  * throw an error if extra arguments are given on the command line
 258  */
 259 static void assert_eol(struct uci_context *ctx, char **str)
 260 {
 261         char *tmp;
 262
 263         tmp = next_arg(ctx, str, false, false);
 264         if (tmp && *tmp)
 265                 uci_parse_error(ctx, *str, "too many arguments");
 266 }
 267
 268 /*
 269  * switch to a different config, either triggered by uci_load, or by a
 270  * 'package <...>' statement in the import file
 271  */
 272 static void uci_switch_config(struct uci_context *ctx)
 273 {
 274         struct uci_parse_context *pctx;
 275         struct uci_element *e;
 276         const char *name;
 277
 278         pctx = ctx->pctx;
 279         name = pctx->name;
 280
 281         /* add the last config to main config file list */
 282         if (pctx->package) {
 283                 uci_list_add(&ctx->root, &pctx->package->e.list);
 284
 285                 pctx->package = NULL;
 286                 pctx->section = NULL;
 287         }
 288
 289         if (!name)
 290                 return;
 291
 292         /*
 293          * if an older config under the same name exists, unload it
 294          * ignore errors here, e.g. if the config was not found
 295          */
 296         e = uci_lookup_list(ctx, &ctx->root, name);
 297         if (e)
 298                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 299         pctx->package = uci_alloc_package(ctx, name);
 300 }
 301
 302 /*
 303  * parse the 'package' uci command (next config package)
 304  */
 305 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
 306 {
 307         char *name = NULL;
 308
 309         /* command string null-terminated by strtok */
 310         *str += strlen(*str) + 1;
 311
 312         name = next_arg(ctx, str, true, true);
 313         assert_eol(ctx, str);
 314         if (single)
 315                 return;
 316
 317         ctx->pctx->name = name;
 318         uci_switch_config(ctx);
 319 }
 320
 321 /*
 322  * parse the 'config' uci command (open a section)
 323  */
 324 static void uci_parse_config(struct uci_context *ctx, char **str)
 325 {
 326         char *name = NULL;
 327         char *type = NULL;
 328
 329         if (!ctx->pctx->package) {
 330                 if (!ctx->pctx->name)
 331                         uci_parse_error(ctx, *str, "attempting to import a file without a package name");
 332
 333                 uci_switch_config(ctx);
 334         }
 335
 336         /* command string null-terminated by strtok */
 337         *str += strlen(*str) + 1;
 338
 339         type = next_arg(ctx, str, true, true);
 340         name = next_arg(ctx, str, false, true);
 341         assert_eol(ctx, str);
 342         ctx->pctx->section = uci_alloc_section(ctx->pctx->package, type, name);
 343 }
 344
 345 /*
 346  * parse the 'option' uci command (open a value)
 347  */
 348 static void uci_parse_option(struct uci_context *ctx, char **str)
 349 {
 350         char *name = NULL;
 351         char *value = NULL;
 352
 353         if (!ctx->pctx->section)
 354                 uci_parse_error(ctx, *str, "option command found before the first section");
 355
 356         /* command string null-terminated by strtok */
 357         *str += strlen(*str) + 1;
 358
 359         name = next_arg(ctx, str, true, true);
 360         value = next_arg(ctx, str, true, false);
 361         assert_eol(ctx, str);
 362         uci_alloc_option(ctx->pctx->section, name, value);
 363 }
 364
 365
 366 /*
 367  * parse a complete input line, split up combined commands by ';'
 368  */
 369 static void uci_parse_line(struct uci_context *ctx, bool single)
 370 {
 371         struct uci_parse_context *pctx = ctx->pctx;
 372         char *word, *brk = NULL;
 373
 374         for (word = strtok_r(pctx->buf, ";", &brk);
 375                  word;
 376                  word = strtok_r(NULL, ";", &brk)) {
 377
 378                 char *pbrk = NULL;
 379                 word = strtok_r(word, " \t", &pbrk);
 380
 381                 switch(word[0]) {
 382                         case 'p':
 383                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 384                                         uci_parse_package(ctx, &word, single);
 385                                 break;
 386                         case 'c':
 387                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 388                                         uci_parse_config(ctx, &word);
 389                                 break;
 390                         case 'o':
 391                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 392                                         uci_parse_option(ctx, &word);
 393                                 break;
 394                         default:
 395                                 uci_parse_error(ctx, word, "unterminated command");
 396                                 break;
 397                 }
 398         }
 399 }
 400
 401 /* max number of characters that escaping adds to the string */
 402 #define UCI_QUOTE_ESCAPE        "'\\''"
 403
 404 /*
 405  * escape an uci string for export
 406  */
 407 static char *uci_escape(struct uci_context *ctx, char *str)
 408 {
 409         char *s, *p;
 410         int pos = 0;
 411
 412         if (!ctx->buf) {
 413                 ctx->bufsz = LINEBUF;
 414                 ctx->buf = malloc(LINEBUF);
 415         }
 416
 417         s = str;
 418         p = strchr(str, '\'');
 419         if (!p)
 420                 return str;
 421
 422         do {
 423                 int len = p - s;
 424                 if (len > 0) {
 425                         if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
 426                                 ctx->bufsz *= 2;
 427                                 ctx->buf = realloc(ctx->buf, ctx->bufsz);
 428                                 if (!ctx->buf)
 429                                         UCI_THROW(ctx, UCI_ERR_MEM);
 430                         }
 431                         memcpy(&ctx->buf[pos], s, len);
 432                         pos += len;
 433                 }
 434                 strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
 435                 pos += sizeof(UCI_QUOTE_ESCAPE);
 436                 s = p + 1;
 437         } while ((p = strchr(s, '\'')));
 438
 439         return ctx->buf;
 440 }
 441
 442
 443 /*
 444  * export a single config package to a file stream
 445  */
 446 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 447 {
 448         struct uci_context *ctx = p->ctx;
 449         struct uci_element *s, *o;
 450
 451         if (header)
 452                 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
 453         uci_foreach_element(&p->sections, s) {
 454                 struct uci_section *sec = uci_to_section(s);
 455                 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
 456                 fprintf(stream, " '%s'\n", uci_escape(ctx, sec->e.name));
 457                 uci_foreach_element(&sec->options, o) {
 458                         struct uci_option *opt = uci_to_option(o);
 459                         fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
 460                         fprintf(stream, " '%s'\n", uci_escape(ctx, opt->value));
 461                 }
 462         }
 463         fprintf(stream, "\n");
 464 }
 465
 466 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 467 {
 468         struct uci_element *e;
 469
 470         UCI_HANDLE_ERR(ctx);
 471         UCI_ASSERT(ctx, stream != NULL);
 472
 473         if (package)
 474                 uci_export_package(package, stream, header);
 475         else {
 476                 uci_foreach_element(&ctx->root, e) {
 477                         uci_export_package(uci_to_package(e), stream, header);
 478                 }
 479         }
 480
 481         return 0;
 482 }
 483
 484 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 485 {
 486         struct uci_parse_context *pctx;
 487
 488         /* make sure no memory from previous parse attempts is leaked */
 489         uci_file_cleanup(ctx);
 490
 491         pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
 492         ctx->pctx = pctx;
 493         pctx->file = stream;
 494
 495         /*
 496          * If 'name' was supplied, assume that the supplied stream does not contain
 497          * the appropriate 'package <name>' string to specify the config name
 498          * NB: the config file can still override the package name
 499          */
 500         if (name)
 501                 pctx->name = name;
 502
 503         while (!feof(pctx->file)) {
 504                 uci_getln(ctx, 0);
 505                 if (pctx->buf[0])
 506                         uci_parse_line(ctx, single);
 507         }
 508
 509         if (package)
 510                 *package = pctx->package;
 511
 512         pctx->name = NULL;
 513         uci_switch_config(ctx);
 514
 515         /* no error happened, we can get rid of the parser context now */
 516         uci_file_cleanup(ctx);
 517
 518         return 0;
 519 }
 520
 521 /*
 522  * open a stream and go to the right position
 523  *
 524  * note: when opening for write and seeking to the beginning of
 525  * the stream, truncate the file
 526  */
 527 static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write)
 528 {
 529         struct stat statbuf;
 530         FILE *file = NULL;
 531         int fd, ret;
 532
 533         if (!write && ((stat(filename, &statbuf) < 0) ||
 534                 ((statbuf.st_mode &  S_IFMT) != S_IFREG))) {
 535                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 536         }
 537
 538         fd = open(filename, (write ? O_RDWR | O_CREAT : O_RDONLY));
 539         if (fd <= 0)
 540                 goto error;
 541
 542         if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
 543                 goto error;
 544
 545         if (write && (pos == SEEK_SET))
 546                 ret = ftruncate(fd, 0);
 547         else
 548                 ret = lseek(fd, 0, pos);
 549
 550         if (ret < 0)
 551                 goto error;
 552
 553         file = fdopen(fd, (write ? "w" : "r"));
 554         if (file)
 555                 goto done;
 556
 557 error:
 558         UCI_THROW(ctx, UCI_ERR_IO);
 559 done:
 560         return file;
 561 }
 562
 563 static void uci_close_stream(FILE *stream)
 564 {
 565         int fd;
 566
 567         if (!stream)
 568                 return;
 569
 570         fd = fileno(stream);
 571         flock(fd, LOCK_UN);
 572         fclose(stream);
 573 }
 574
 575 static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
 576 {
 577         bool delete = false;
 578         char *package = NULL;
 579         char *section = NULL;
 580         char *option = NULL;
 581         char *value = NULL;
 582
 583         if (buf[0] == '-') {
 584                 delete = true;
 585                 buf++;
 586         }
 587
 588         UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
 589         if (!package || !section || (!delete && !value))
 590                 goto error;
 591         if (strcmp(package, p->e.name) != 0)
 592                 goto error;
 593         if (!uci_validate_name(section))
 594                 goto error;
 595         if (option && !uci_validate_name(option))
 596                 goto error;
 597
 598         if (delete)
 599                 UCI_INTERNAL(uci_del, ctx, p, section, option);
 600         else
 601                 UCI_INTERNAL(uci_set, ctx, p, section, option, value);
 602
 603         return;
 604 error:
 605         UCI_THROW(ctx, UCI_ERR_PARSE);
 606 }
 607
 608 static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
 609 {
 610         struct uci_parse_context *pctx;
 611
 612         /* make sure no memory from previous parse attempts is leaked */
 613         uci_file_cleanup(ctx);
 614
 615         pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
 616         ctx->pctx = pctx;
 617         pctx->file = stream;
 618
 619         rewind(stream);
 620         while (!feof(pctx->file)) {
 621                 uci_getln(ctx, 0);
 622                 if (!pctx->buf[0])
 623                         continue;
 624                 uci_parse_history_line(ctx, p, pctx->buf);
 625         }
 626
 627         /* no error happened, we can get rid of the parser context now */
 628         uci_file_cleanup(ctx);
 629 }
 630
 631 static void uci_load_history(struct uci_context *ctx, struct uci_package *p)
 632 {
 633         char *filename = NULL;
 634         FILE *f = NULL;
 635
 636         if (!p->confdir)
 637                 return;
 638         if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
 639                 UCI_THROW(ctx, UCI_ERR_MEM);
 640
 641         UCI_TRAP_SAVE(ctx, done);
 642         f = uci_open_stream(ctx, filename, SEEK_SET, false);
 643         uci_parse_history(ctx, f, p);
 644         UCI_TRAP_RESTORE(ctx);
 645 done:
 646         if (filename)
 647                 free(filename);
 648         uci_close_stream(f);
 649         ctx->errno = 0;
 650 }
 651
 652 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 653 {
 654         char *filename;
 655         bool confdir;
 656         FILE *file = NULL;
 657
 658         UCI_HANDLE_ERR(ctx);
 659         UCI_ASSERT(ctx, name != NULL);
 660
 661         switch (name[0]) {
 662         case '.':
 663                 /* relative path outside of /etc/config */
 664                 if (name[1] != '/')
 665                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 666                 /* fall through */
 667         case '/':
 668                 /* absolute path outside of /etc/config */
 669                 filename = uci_strdup(ctx, name);
 670                 name = strrchr(name, '/') + 1;
 671                 confdir = false;
 672                 break;
 673         default:
 674                 /* config in /etc/config */
 675                 if (strchr(name, '/'))
 676                         UCI_THROW(ctx, UCI_ERR_INVAL);
 677                 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
 678                 sprintf(filename, UCI_CONFDIR "/%s", name);
 679                 confdir = true;
 680                 break;
 681         }
 682
 683         file = uci_open_stream(ctx, filename, SEEK_SET, false);
 684         ctx->errno = 0;
 685         UCI_TRAP_SAVE(ctx, done);
 686         uci_import(ctx, file, name, package, true);
 687         UCI_TRAP_RESTORE(ctx);
 688
 689         if (*package) {
 690                 (*package)->path = filename;
 691                 (*package)->confdir = confdir;
 692                 uci_load_history(ctx, *package);
 693         }
 694
 695 done:
 696         uci_close_stream(file);
 697         return ctx->errno;
 698 }
 699
 700 int uci_save(struct uci_context *ctx, struct uci_package *p)
 701 {
 702         FILE *f = NULL;
 703         char *filename = NULL;
 704         struct uci_element *e, *tmp;
 705
 706         UCI_HANDLE_ERR(ctx);
 707         UCI_ASSERT(ctx, p != NULL);
 708
 709         /*
 710          * if the config file was outside of the /etc/config path,
 711          * don't save the history to a file, update the real file
 712          * directly
 713          */
 714         if (!p->confdir)
 715                 return uci_commit(ctx, p);
 716
 717         if (uci_list_empty(&p->history))
 718                 return 0;
 719
 720         if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
 721                 UCI_THROW(ctx, UCI_ERR_MEM);
 722
 723         ctx->errno = 0;
 724         UCI_TRAP_SAVE(ctx, done);
 725         f = uci_open_stream(ctx, filename, SEEK_END, true);
 726         UCI_TRAP_RESTORE(ctx);
 727
 728         uci_foreach_element_safe(&p->history, tmp, e) {
 729                 struct uci_history *h = uci_to_history(e);
 730
 731                 if (h->cmd == UCI_CMD_REMOVE)
 732                         fprintf(f, "-");
 733
 734                 fprintf(f, "%s.%s", p->e.name, h->section);
 735                 if (e->name)
 736                         fprintf(f, ".%s", e->name);
 737
 738                 if (h->cmd == UCI_CMD_REMOVE)
 739                         fprintf(f, "\n");
 740                 else
 741                         fprintf(f, "=%s\n", h->value);
 742                 uci_list_del(&e->list);
 743         }
 744
 745 done:
 746         uci_close_stream(f);
 747         if (filename)
 748                 free(filename);
 749         if (ctx->errno)
 750                 UCI_THROW(ctx, ctx->errno);
 751
 752         return 0;
 753 }
 754
 755 int uci_commit(struct uci_context *ctx, struct uci_package *p)
 756 {
 757         FILE *f = NULL;
 758
 759         UCI_HANDLE_ERR(ctx);
 760         UCI_ASSERT(ctx, p != NULL);
 761         UCI_ASSERT(ctx, p->path != NULL);
 762
 763         f = uci_open_stream(ctx, p->path, SEEK_SET, true);
 764
 765         UCI_TRAP_SAVE(ctx, done);
 766         uci_export(ctx, f, p, false);
 767         UCI_TRAP_RESTORE(ctx);
 768
 769 done:
 770         uci_close_stream(f);
 771         if (ctx->errno)
 772                 UCI_THROW(ctx, ctx->errno);
 773
 774         return 0;
 775 }
 776
 777
 778 /*
 779  * This function returns the filename by returning the string
 780  * after the last '/' character. By checking for a non-'\0'
 781  * character afterwards, directories are ignored (glob marks
 782  * those with a trailing '/'
 783  */
 784 static inline char *get_filename(char *path)
 785 {
 786         char *p;
 787
 788         p = strrchr(path, '/');
 789         p++;
 790         if (!*p)
 791                 return NULL;
 792         return p;
 793 }
 794
 795 char **uci_list_configs(struct uci_context *ctx)
 796 {
 797         char **configs;
 798         glob_t globbuf;
 799         int size, i;
 800         char *buf;
 801
 802         if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
 803                 return NULL;
 804
 805         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 806         for(i = 0; i < globbuf.gl_pathc; i++) {
 807                 char *p;
 808
 809                 p = get_filename(globbuf.gl_pathv[i]);
 810                 if (!p)
 811                         continue;
 812
 813                 size += strlen(p) + 1;
 814         }
 815
 816         configs = uci_malloc(ctx, size);
 817         buf = (char *) &configs[globbuf.gl_pathc + 1];
 818         for(i = 0; i < globbuf.gl_pathc; i++) {
 819                 char *p;
 820
 821                 p = get_filename(globbuf.gl_pathv[i]);
 822                 if (!p)
 823                         continue;
 824
 825                 configs[i] = buf;
 826                 strcpy(buf, p);
 827                 buf += strlen(buf) + 1;
 828         }
 829         return configs;
 830 }
 831