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 (!*val) {
 248                 if (required)
 249                         uci_parse_error(ctx, *str, "insufficient arguments");
 250                 goto done;
 251         }
 252
 253         if (name && !uci_validate_name(val))
 254                 uci_parse_error(ctx, val, "invalid character in field");
 255
 256 done:
 257         return val;
 258 }
 259
 260 /*
 261  * verify that the end of the line or command is reached.
 262  * throw an error if extra arguments are given on the command line
 263  */
 264 static void assert_eol(struct uci_context *ctx, char **str)
 265 {
 266         char *tmp;
 267
 268         tmp = next_arg(ctx, str, false, false);
 269         if (tmp && *tmp)
 270                 uci_parse_error(ctx, *str, "too many arguments");
 271 }
 272
 273 /*
 274  * switch to a different config, either triggered by uci_load, or by a
 275  * 'package <...>' statement in the import file
 276  */
 277 static void uci_switch_config(struct uci_context *ctx)
 278 {
 279         struct uci_parse_context *pctx;
 280         struct uci_element *e;
 281         const char *name;
 282
 283         pctx = ctx->pctx;
 284         name = pctx->name;
 285
 286         /* add the last config to main config file list */
 287         if (pctx->package) {
 288                 uci_list_add(&ctx->root, &pctx->package->e.list);
 289
 290                 pctx->package = NULL;
 291                 pctx->section = NULL;
 292         }
 293
 294         if (!name)
 295                 return;
 296
 297         /*
 298          * if an older config under the same name exists, unload it
 299          * ignore errors here, e.g. if the config was not found
 300          */
 301         e = uci_lookup_list(ctx, &ctx->root, name);
 302         if (e)
 303                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 304         pctx->package = uci_alloc_package(ctx, name);
 305 }
 306
 307 /*
 308  * parse the 'package' uci command (next config package)
 309  */
 310 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
 311 {
 312         char *name = NULL;
 313
 314         /* command string null-terminated by strtok */
 315         *str += strlen(*str) + 1;
 316
 317         name = next_arg(ctx, str, true, true);
 318         assert_eol(ctx, str);
 319         if (single)
 320                 return;
 321
 322         ctx->pctx->name = name;
 323         uci_switch_config(ctx);
 324 }
 325
 326 /*
 327  * parse the 'config' uci command (open a section)
 328  */
 329 static void uci_parse_config(struct uci_context *ctx, char **str)
 330 {
 331         char *name = NULL;
 332         char *type = NULL;
 333
 334         if (!ctx->pctx->package) {
 335                 if (!ctx->pctx->name)
 336                         uci_parse_error(ctx, *str, "attempting to import a file without a package name");
 337
 338                 uci_switch_config(ctx);
 339         }
 340
 341         /* command string null-terminated by strtok */
 342         *str += strlen(*str) + 1;
 343
 344         type = next_arg(ctx, str, true, true);
 345         name = next_arg(ctx, str, false, true);
 346         assert_eol(ctx, str);
 347         ctx->pctx->section = uci_alloc_section(ctx->pctx->package, type, name);
 348 }
 349
 350 /*
 351  * parse the 'option' uci command (open a value)
 352  */
 353 static void uci_parse_option(struct uci_context *ctx, char **str)
 354 {
 355         char *name = NULL;
 356         char *value = NULL;
 357
 358         if (!ctx->pctx->section)
 359                 uci_parse_error(ctx, *str, "option command found before the first section");
 360
 361         /* command string null-terminated by strtok */
 362         *str += strlen(*str) + 1;
 363
 364         name = next_arg(ctx, str, true, true);
 365         value = next_arg(ctx, str, true, false);
 366         assert_eol(ctx, str);
 367         uci_alloc_option(ctx->pctx->section, name, value);
 368 }
 369
 370
 371 /*
 372  * parse a complete input line, split up combined commands by ';'
 373  */
 374 static void uci_parse_line(struct uci_context *ctx, bool single)
 375 {
 376         struct uci_parse_context *pctx = ctx->pctx;
 377         char *word, *brk = NULL;
 378
 379         for (word = strtok_r(pctx->buf, ";", &brk);
 380                  word;
 381                  word = strtok_r(NULL, ";", &brk)) {
 382
 383                 char *pbrk = NULL;
 384                 word = strtok_r(word, " \t", &pbrk);
 385
 386                 switch(word[0]) {
 387                         case 'p':
 388                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 389                                         uci_parse_package(ctx, &word, single);
 390                                 break;
 391                         case 'c':
 392                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 393                                         uci_parse_config(ctx, &word);
 394                                 break;
 395                         case 'o':
 396                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 397                                         uci_parse_option(ctx, &word);
 398                                 break;
 399                         default:
 400                                 uci_parse_error(ctx, word, "unterminated command");
 401                                 break;
 402                 }
 403         }
 404 }
 405
 406 /* max number of characters that escaping adds to the string */
 407 #define UCI_QUOTE_ESCAPE        "'\\''"
 408
 409 /*
 410  * escape an uci string for export
 411  */
 412 static char *uci_escape(struct uci_context *ctx, char *str)
 413 {
 414         char *s, *p;
 415         int pos = 0;
 416
 417         if (!ctx->buf) {
 418                 ctx->bufsz = LINEBUF;
 419                 ctx->buf = malloc(LINEBUF);
 420         }
 421
 422         s = str;
 423         p = strchr(str, '\'');
 424         if (!p)
 425                 return str;
 426
 427         do {
 428                 int len = p - s;
 429                 if (len > 0) {
 430                         if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
 431                                 ctx->bufsz *= 2;
 432                                 ctx->buf = realloc(ctx->buf, ctx->bufsz);
 433                                 if (!ctx->buf)
 434                                         UCI_THROW(ctx, UCI_ERR_MEM);
 435                         }
 436                         memcpy(&ctx->buf[pos], s, len);
 437                         pos += len;
 438                 }
 439                 strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
 440                 pos += sizeof(UCI_QUOTE_ESCAPE);
 441                 s = p + 1;
 442         } while ((p = strchr(s, '\'')));
 443
 444         return ctx->buf;
 445 }
 446
 447
 448 /*
 449  * export a single config package to a file stream
 450  */
 451 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 452 {
 453         struct uci_context *ctx = p->ctx;
 454         struct uci_element *s, *o;
 455
 456         if (header)
 457                 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
 458         uci_foreach_element(&p->sections, s) {
 459                 struct uci_section *sec = uci_to_section(s);
 460                 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
 461                 fprintf(stream, " '%s'\n", uci_escape(ctx, sec->e.name));
 462                 uci_foreach_element(&sec->options, o) {
 463                         struct uci_option *opt = uci_to_option(o);
 464                         fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
 465                         fprintf(stream, " '%s'\n", uci_escape(ctx, opt->value));
 466                 }
 467         }
 468         fprintf(stream, "\n");
 469 }
 470
 471 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 472 {
 473         struct uci_element *e;
 474
 475         UCI_HANDLE_ERR(ctx);
 476         UCI_ASSERT(ctx, stream != NULL);
 477
 478         if (package)
 479                 uci_export_package(package, stream, header);
 480         else {
 481                 uci_foreach_element(&ctx->root, e) {
 482                         uci_export_package(uci_to_package(e), stream, header);
 483                 }
 484         }
 485
 486         return 0;
 487 }
 488
 489 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 490 {
 491         struct uci_parse_context *pctx;
 492
 493         /* make sure no memory from previous parse attempts is leaked */
 494         uci_file_cleanup(ctx);
 495
 496         pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
 497         ctx->pctx = pctx;
 498         pctx->file = stream;
 499
 500         /*
 501          * If 'name' was supplied, assume that the supplied stream does not contain
 502          * the appropriate 'package <name>' string to specify the config name
 503          * NB: the config file can still override the package name
 504          */
 505         if (name)
 506                 pctx->name = name;
 507
 508         while (!feof(pctx->file)) {
 509                 uci_getln(ctx, 0);
 510                 UCI_TRAP_SAVE(ctx, error);
 511                 if (pctx->buf[0])
 512                         uci_parse_line(ctx, single);
 513                 UCI_TRAP_RESTORE(ctx);
 514                 continue;
 515 error:
 516                 if (ctx->flags & UCI_FLAG_PERROR)
 517                         uci_perror(ctx, NULL);
 518                 if ((ctx->errno != UCI_ERR_PARSE) ||
 519                         (ctx->flags & UCI_FLAG_STRICT))
 520                         UCI_THROW(ctx, ctx->errno);
 521         }
 522
 523         if (package)
 524                 *package = pctx->package;
 525
 526         pctx->name = NULL;
 527         uci_switch_config(ctx);
 528
 529         /* no error happened, we can get rid of the parser context now */
 530         uci_file_cleanup(ctx);
 531
 532         return 0;
 533 }
 534
 535 /*
 536  * open a stream and go to the right position
 537  *
 538  * note: when opening for write and seeking to the beginning of
 539  * the stream, truncate the file
 540  */
 541 static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
 542 {
 543         struct stat statbuf;
 544         FILE *file = NULL;
 545         int fd, ret;
 546         int mode = (write ? O_RDWR : O_RDONLY);
 547
 548         if (create)
 549                 mode |= O_CREAT;
 550
 551         if (!write && ((stat(filename, &statbuf) < 0) ||
 552                 ((statbuf.st_mode &  S_IFMT) != S_IFREG))) {
 553                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 554         }
 555
 556         fd = open(filename, mode, UCI_FILEMODE);
 557         if (fd <= 0)
 558                 goto error;
 559
 560         if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
 561                 goto error;
 562
 563         ret = lseek(fd, 0, pos);
 564
 565         if (ret < 0)
 566                 goto error;
 567
 568         file = fdopen(fd, (write ? "w+" : "r"));
 569         if (file)
 570                 goto done;
 571
 572 error:
 573         UCI_THROW(ctx, UCI_ERR_IO);
 574 done:
 575         return file;
 576 }
 577
 578 static void uci_close_stream(FILE *stream)
 579 {
 580         int fd;
 581
 582         if (!stream)
 583                 return;
 584
 585         fd = fileno(stream);
 586         flock(fd, LOCK_UN);
 587         fclose(stream);
 588 }
 589
 590 static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
 591 {
 592         bool delete = false;
 593         char *package = NULL;
 594         char *section = NULL;
 595         char *option = NULL;
 596         char *value = NULL;
 597
 598         if (buf[0] == '-') {
 599                 delete = true;
 600                 buf++;
 601         }
 602
 603         UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
 604         if (!package || !section || (!delete && !value))
 605                 goto error;
 606         if (strcmp(package, p->e.name) != 0)
 607                 goto error;
 608         if (!uci_validate_name(section))
 609                 goto error;
 610         if (option && !uci_validate_name(option))
 611                 goto error;
 612
 613         if (delete)
 614                 UCI_INTERNAL(uci_del, ctx, p, section, option);
 615         else
 616                 UCI_INTERNAL(uci_set, ctx, p, section, option, value);
 617
 618         return;
 619 error:
 620         UCI_THROW(ctx, UCI_ERR_PARSE);
 621 }
 622
 623 static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
 624 {
 625         struct uci_parse_context *pctx;
 626
 627         /* make sure no memory from previous parse attempts is leaked */
 628         uci_file_cleanup(ctx);
 629
 630         pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
 631         ctx->pctx = pctx;
 632         pctx->file = stream;
 633
 634         while (!feof(pctx->file)) {
 635                 uci_getln(ctx, 0);
 636                 if (!pctx->buf[0])
 637                         continue;
 638
 639                 /*
 640                  * ignore parse errors in single lines, we want to preserve as much
 641                  * history as possible
 642                  */
 643                 UCI_TRAP_SAVE(ctx, error);
 644                 uci_parse_history_line(ctx, p, pctx->buf);
 645                 UCI_TRAP_RESTORE(ctx);
 646 error:
 647                 continue;
 648         }
 649
 650         /* no error happened, we can get rid of the parser context now */
 651         uci_file_cleanup(ctx);
 652 }
 653
 654 static void uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
 655 {
 656         char *filename = NULL;
 657         FILE *f = NULL;
 658
 659         if (!p->confdir)
 660                 return;
 661         if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
 662                 UCI_THROW(ctx, UCI_ERR_MEM);
 663
 664         UCI_TRAP_SAVE(ctx, done);
 665         f = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
 666         uci_parse_history(ctx, f, p);
 667         UCI_TRAP_RESTORE(ctx);
 668
 669 done:
 670         if (flush && f) {
 671                 rewind(f);
 672                 ftruncate(fileno(f), 0);
 673         }
 674         if (filename)
 675                 free(filename);
 676         uci_close_stream(f);
 677         ctx->errno = 0;
 678 }
 679
 680
 681 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
 682 {
 683         char *filename;
 684         bool confdir;
 685         FILE *file = NULL;
 686
 687         UCI_HANDLE_ERR(ctx);
 688         UCI_ASSERT(ctx, name != NULL);
 689
 690         switch (name[0]) {
 691         case '.':
 692                 /* relative path outside of /etc/config */
 693                 if (name[1] != '/')
 694                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 695                 /* fall through */
 696         case '/':
 697                 /* absolute path outside of /etc/config */
 698                 filename = uci_strdup(ctx, name);
 699                 name = strrchr(name, '/') + 1;
 700                 confdir = false;
 701                 break;
 702         default:
 703                 /* config in /etc/config */
 704                 if (strchr(name, '/'))
 705                         UCI_THROW(ctx, UCI_ERR_INVAL);
 706                 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
 707                 sprintf(filename, UCI_CONFDIR "/%s", name);
 708                 confdir = true;
 709                 break;
 710         }
 711
 712         file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
 713         ctx->errno = 0;
 714         UCI_TRAP_SAVE(ctx, done);
 715         uci_import(ctx, file, name, package, true);
 716         UCI_TRAP_RESTORE(ctx);
 717
 718         if (*package) {
 719                 (*package)->path = filename;
 720                 (*package)->confdir = confdir;
 721                 uci_load_history(ctx, *package, false);
 722         }
 723
 724 done:
 725         uci_close_stream(file);
 726         return ctx->errno;
 727 }
 728
 729 int uci_save(struct uci_context *ctx, struct uci_package *p)
 730 {
 731         FILE *f = NULL;
 732         char *filename = NULL;
 733         struct uci_element *e, *tmp;
 734
 735         UCI_HANDLE_ERR(ctx);
 736         UCI_ASSERT(ctx, p != NULL);
 737
 738         /*
 739          * if the config file was outside of the /etc/config path,
 740          * don't save the history to a file, update the real file
 741          * directly.
 742          * does not modify the uci_package pointer
 743          */
 744         if (!p->confdir)
 745                 return uci_commit(ctx, &p);
 746
 747         if (uci_list_empty(&p->history))
 748                 return 0;
 749
 750         if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
 751                 UCI_THROW(ctx, UCI_ERR_MEM);
 752
 753         ctx->errno = 0;
 754         UCI_TRAP_SAVE(ctx, done);
 755         f = uci_open_stream(ctx, filename, SEEK_END, true, true);
 756         UCI_TRAP_RESTORE(ctx);
 757
 758         uci_foreach_element_safe(&p->history, tmp, e) {
 759                 struct uci_history *h = uci_to_history(e);
 760
 761                 if (h->cmd == UCI_CMD_REMOVE)
 762                         fprintf(f, "-");
 763
 764                 fprintf(f, "%s.%s", p->e.name, h->section);
 765                 if (e->name)
 766                         fprintf(f, ".%s", e->name);
 767
 768                 if (h->cmd == UCI_CMD_REMOVE)
 769                         fprintf(f, "\n");
 770                 else
 771                         fprintf(f, "=%s\n", h->value);
 772                 uci_free_history(h);
 773         }
 774
 775 done:
 776         uci_close_stream(f);
 777         if (filename)
 778                 free(filename);
 779         if (ctx->errno)
 780                 UCI_THROW(ctx, ctx->errno);
 781
 782         return 0;
 783 }
 784
 785 int uci_commit(struct uci_context *ctx, struct uci_package **package)
 786 {
 787         struct uci_package *p;
 788         FILE *f = NULL;
 789         char *name = NULL;
 790         char *path = NULL;
 791
 792         UCI_HANDLE_ERR(ctx);
 793         UCI_ASSERT(ctx, package != NULL);
 794         p = *package;
 795
 796         UCI_ASSERT(ctx, p != NULL);
 797         UCI_ASSERT(ctx, p->path != NULL);
 798
 799         /* open the config file for writing now, so that it is locked */
 800         f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
 801
 802         /* flush unsaved changes and reload from history file */
 803         UCI_TRAP_SAVE(ctx, done);
 804         if (p->confdir) {
 805                 name = uci_strdup(ctx, p->e.name);
 806                 path = uci_strdup(ctx, p->path);
 807                 if (!uci_list_empty(&p->history))
 808                         UCI_INTERNAL(uci_save, ctx, p);
 809                 uci_free_package(&p);
 810                 uci_file_cleanup(ctx);
 811                 UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
 812
 813                 p->path = path;
 814                 p->confdir = true;
 815                 *package = p;
 816
 817                 /* freed together with the uci_package */
 818                 path = NULL;
 819
 820                 /* check for updated history, just in case */
 821                 uci_load_history(ctx, p, true);
 822         }
 823
 824         rewind(f);
 825         ftruncate(fileno(f), 0);
 826
 827         uci_export(ctx, f, p, false);
 828         UCI_TRAP_RESTORE(ctx);
 829
 830 done:
 831         if (name)
 832                 free(name);
 833         if (path)
 834                 free(path);
 835         uci_close_stream(f);
 836         if (ctx->errno)
 837                 UCI_THROW(ctx, ctx->errno);
 838
 839         return 0;
 840 }
 841
 842
 843 /*
 844  * This function returns the filename by returning the string
 845  * after the last '/' character. By checking for a non-'\0'
 846  * character afterwards, directories are ignored (glob marks
 847  * those with a trailing '/'
 848  */
 849 static inline char *get_filename(char *path)
 850 {
 851         char *p;
 852
 853         p = strrchr(path, '/');
 854         p++;
 855         if (!*p)
 856                 return NULL;
 857         return p;
 858 }
 859
 860 int uci_list_configs(struct uci_context *ctx, char ***list)
 861 {
 862         char **configs;
 863         glob_t globbuf;
 864         int size, i;
 865         char *buf;
 866
 867         UCI_HANDLE_ERR(ctx);
 868
 869         if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
 870                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 871
 872         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 873         for(i = 0; i < globbuf.gl_pathc; i++) {
 874                 char *p;
 875
 876                 p = get_filename(globbuf.gl_pathv[i]);
 877                 if (!p)
 878                         continue;
 879
 880                 size += strlen(p) + 1;
 881         }
 882
 883         configs = uci_malloc(ctx, size);
 884         buf = (char *) &configs[globbuf.gl_pathc + 1];
 885         for(i = 0; i < globbuf.gl_pathc; i++) {
 886                 char *p;
 887
 888                 p = get_filename(globbuf.gl_pathv[i]);
 889                 if (!p)
 890                         continue;
 891
 892                 configs[i] = buf;
 893                 strcpy(buf, p);
 894                 buf += strlen(buf) + 1;
 895         }
 896         *list = configs;
 897
 898         return 0;
 899 }
 900