src/libopensrf/osrf_legacy_json.c

   1 /*
   2 Copyright (C) 2006  Georgia Public Library Service
   3 Bill Erickson <billserickson@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14 */
  15
  16
  17 #include <opensrf/osrf_legacy_json.h>
  18
  19 /* keep a copy of the length of the current json string so we don't
  20  * have to calculate it in each function
  21  */
  22 int current_strlen;
  23
  24
  25 jsonObject* legacy_jsonParseString( const char* string) {
  26         return json_parse_string( (char*) string );
  27 }
  28
  29 jsonObject* legacy_jsonParseStringFmt( const char* string, ... ) {
  30         VA_LIST_TO_STRING(string);
  31         return json_parse_string( VA_BUF );
  32 }
  33
  34
  35 jsonObject* json_parse_string(char* string) {
  36
  37         if(string == NULL) return NULL;
  38
  39         current_strlen = strlen(string);
  40
  41         if(current_strlen == 0)
  42                 return NULL;
  43
  44         unsigned long index = 0;
  45
  46         json_eat_ws(string, &index, 1, current_strlen); /* remove leading whitespace */
  47         if(index == current_strlen) return NULL;
  48
  49         jsonObject* obj = jsonNewObject(NULL);
  50
  51         int status = _json_parse_string(string, &index, obj, current_strlen);
  52         if(!status) return obj;
  53
  54         if(status == -2) {
  55                 jsonObjectFree(obj);
  56                 return NULL;
  57         }
  58
  59         return NULL;
  60 }
  61
  62
  63 int _json_parse_string(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
  64         if( !string || !index || *index >= current_strlen) return -2;
  65
  66         int status = 0; /* return code from parsing routines */
  67         char* classname = NULL; /* object class hint */
  68         json_eat_ws(string, index, 1, current_strlen); /* remove leading whitespace */
  69
  70         char c = string[*index];
  71
  72         /* remove any leading comments */
  73         if( c == '/' ) {
  74
  75                 while(1) {
  76                         (*index)++; /* move to second comment char */
  77                         status = json_eat_comment(string, index, &classname, 1, current_strlen);
  78                         if(status) return status;
  79
  80                         json_eat_ws(string, index, 1, current_strlen);
  81                         c = string[*index];
  82                         if(c != '/')
  83                                 break;
  84                 }
  85         }
  86
  87         json_eat_ws(string, index, 1, current_strlen); /* remove leading whitespace */
  88
  89         if(*index >= current_strlen)
  90                 return -2;
  91
  92         switch(c) {
  93
  94                 /* json string */
  95                 case '"':
  96                         (*index)++;
  97                         status = json_parse_json_string(string, index, obj, current_strlen);
  98                         break;
  99
 100                 /* json array */
 101                 case '[':
 102                         (*index)++;
 103                         status = json_parse_json_array(string, index, obj, current_strlen);
 104                         break;
 105
 106                 /* json object */
 107                 case '{':
 108                         (*index)++;
 109                         status = json_parse_json_object(string, index, obj, current_strlen);
 110                         break;
 111
 112                 /* NULL */
 113                 case 'n':
 114                 case 'N':
 115                         status = json_parse_json_null(string, index, obj, current_strlen);
 116                         break;
 117
 118
 119                 /* true, false */
 120                 case 'f':
 121                 case 'F':
 122                 case 't':
 123                 case 'T':
 124                         status = json_parse_json_bool(string, index, obj, current_strlen);
 125                         break;
 126
 127                 default:
 128                         if(isdigit(c) || c == '.' || c == '-') { /* are we a number? */
 129                                 status = json_parse_json_number(string, index, obj, current_strlen);
 130                                 if(status) return status;
 131                                 break;
 132                         }
 133
 134                         (*index)--;
 135                         /* we should never get here */
 136                         return json_handle_error(string, index, "_json_parse_string() final switch clause");
 137         }
 138
 139         if(status) return status;
 140
 141         json_eat_ws(string, index, 1, current_strlen);
 142
 143         if( *index < current_strlen ) {
 144                 /* remove any trailing comments */
 145                 c = string[*index];
 146                 if( c == '/' ) {
 147                         (*index)++;
 148                         status = json_eat_comment(string, index, NULL, 0, current_strlen);
 149                         if(status) return status;
 150                 }
 151         }
 152
 153         if(classname){
 154                 jsonObjectSetClass(obj, classname);
 155                 free(classname);
 156         }
 157
 158         return 0;
 159 }
 160
 161
 162 int json_parse_json_null(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 163
 164         if(*index >= (current_strlen - 3)) {
 165                 return json_handle_error(string, index,
 166                         "_parse_json_null(): invalid null" );
 167         }
 168
 169         if(!strncasecmp(string + (*index), "null", 4)) {
 170                 (*index) += 4;
 171                 obj->type = JSON_NULL;
 172                 return 0;
 173         } else {
 174                 return json_handle_error(string, index,
 175                         "_parse_json_null(): invalid null" );
 176         }
 177 }
 178
 179 /* should be at the first character of the bool at this point */
 180 int json_parse_json_bool(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 181         if( ! string || ! obj || *index >= current_strlen ) return -1;
 182
 183         char* ret = "json_parse_json_bool(): truncated bool";
 184
 185         if( *index >= (current_strlen - 5))
 186                 return json_handle_error(string, index, ret);
 187
 188         if(!strncasecmp( string + (*index), "false", 5)) {
 189                 (*index) += 5;
 190                 obj->value.b = 0;
 191                 obj->type = JSON_BOOL;
 192                 return 0;
 193         }
 194
 195         if( *index >= (current_strlen - 4))
 196                 return json_handle_error(string, index, ret);
 197
 198         if(!strncasecmp( string + (*index), "true", 4)) {
 199                 (*index) += 4;
 200                 obj->value.b = 1;
 201                 obj->type = JSON_BOOL;
 202                 return 0;
 203         }
 204
 205         return json_handle_error(string, index, ret);
 206 }
 207
 208
 209 /* expecting the first character of the number */
 210 int json_parse_json_number(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 211         if( ! string || ! obj || *index >= current_strlen ) return -1;
 212
 213         growing_buffer* buf = buffer_init(64);
 214         char c = string[*index];
 215
 216         int done = 0;
 217         int dot_seen = 0;
 218
 219         /* negative number? */
 220         if(c == '-') { buffer_add(buf, "-"); (*index)++; }
 221
 222         c = string[*index];
 223
 224         while(*index < current_strlen) {
 225
 226                 if(isdigit(c)) {
 227                         buffer_add_char(buf, c);
 228                 }
 229
 230                 else if( c == '.' ) {
 231                         if(dot_seen) {
 232                                 buffer_free(buf);
 233                                 return json_handle_error(string, index,
 234                                         "json_parse_json_number(): malformed json number");
 235                         }
 236                         dot_seen = 1;
 237                         buffer_add_char(buf, c);
 238                 } else {
 239                         done = 1; break;
 240                 }
 241
 242                 (*index)++;
 243                 c = string[*index];
 244                 if(done) break;
 245         }
 246
 247         obj->type = JSON_NUMBER;
 248         obj->value.s = buffer_release(buf);
 249         return 0;
 250 }
 251
 252 /* index should point to the character directly following the '['.  when done
 253  * index will point to the character directly following the ']' character
 254  */
 255 int json_parse_json_array(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 256
 257         if( ! string || ! obj || ! index || *index >= current_strlen ) return -1;
 258
 259         int status = 0;
 260         int in_parse = 0; /* true if this array already contains one item */
 261         obj->type = JSON_ARRAY;
 262         int set = 0;
 263         int done = 0;
 264
 265         while(*index < current_strlen) {
 266
 267                 json_eat_ws(string, index, 1, current_strlen);
 268
 269                 if(string[*index] == ']') {
 270                         (*index)++;
 271                         done = 1;
 272                         break;
 273                 }
 274
 275                 if(in_parse) {
 276                         json_eat_ws(string, index, 1, current_strlen);
 277                         if(string[*index] != ',') {
 278                                 return json_handle_error(string, index,
 279                                         "json_parse_json_array(): array item not followed by a ','");
 280                         }
 281                         (*index)++;
 282                         json_eat_ws(string, index, 1, current_strlen);
 283                 }
 284
 285                 jsonObject* item = jsonNewObject(NULL);
 286
 287                 #ifndef STRICT_JSON_READ
 288                 if(*index < current_strlen) {
 289                         if(string[*index] == ',' || string[*index] == ']') {
 290                                 status = 0;
 291                                 set = 1;
 292                         }
 293                 }
 294                 if(!set) status = _json_parse_string(string, index, item, current_strlen);
 295
 296                 #else
 297                 status = _json_parse_string(string, index, item, current_strlen);
 298                 #endif
 299
 300                 if(status) { jsonObjectFree(item); return status; }
 301                 jsonObjectPush(obj, item);
 302                 in_parse = 1;
 303                 set = 0;
 304         }
 305
 306         if(!done)
 307                 return json_handle_error(string, index,
 308                         "json_parse_json_array(): array not closed");
 309
 310         return 0;
 311 }
 312
 313
 314 /* index should point to the character directly following the '{'.  when done
 315  * index will point to the character directly following the '}'
 316  */
 317 int json_parse_json_object(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 318         if( ! string || !obj || ! index || *index >= current_strlen ) return -1;
 319
 320         obj->type = JSON_HASH;
 321         int status;
 322         int in_parse = 0; /* true if we've already added one item to this object */
 323         int set = 0;
 324         int done = 0;
 325
 326         while(*index < current_strlen) {
 327
 328                 json_eat_ws(string, index, 1, current_strlen);
 329
 330                 if(string[*index] == '}') {
 331                         (*index)++;
 332                         done = 1;
 333                         break;
 334                 }
 335
 336                 if(in_parse) {
 337                         if(string[*index] != ',') {
 338                                 return json_handle_error(string, index,
 339                                         "json_parse_json_object(): object missing ',' between elements" );
 340                         }
 341                         (*index)++;
 342                         json_eat_ws(string, index, 1, current_strlen);
 343                 }
 344
 345                 /* first we grab the hash key */
 346                 jsonObject* key_obj = jsonNewObject(NULL);
 347                 status = _json_parse_string(string, index, key_obj, current_strlen);
 348                 if(status) return status;
 349
 350                 if(key_obj->type != JSON_STRING) {
 351                         return json_handle_error(string, index,
 352                                 "_json_parse_json_object(): hash key not a string");
 353                 }
 354
 355                 char* key = key_obj->value.s;
 356
 357                 json_eat_ws(string, index, 1, current_strlen);
 358
 359                 if(string[*index] != ':') {
 360                         return json_handle_error(string, index,
 361                                 "json_parse_json_object(): hash key not followed by ':' character");
 362                 }
 363
 364                 (*index)++;
 365
 366                 /* now grab the value object */
 367                 json_eat_ws(string, index, 1, current_strlen);
 368                 jsonObject* value_obj = jsonNewObject(NULL);
 369
 370 #ifndef STRICT_JSON_READ
 371                 if(*index < current_strlen) {
 372                         if(string[*index] == ',' || string[*index] == '}') {
 373                                 status = 0;
 374                                 set = 1;
 375                         }
 376                 }
 377                 if(!set)
 378                         status = _json_parse_string(string, index, value_obj, current_strlen);
 379
 380 #else
 381                  status = _json_parse_string(string, index, value_obj, current_strlen);
 382 #endif
 383
 384                 if(status) return status;
 385
 386                 /* put the data into the object and continue */
 387                 jsonObjectSetKey(obj, key, value_obj);
 388                 jsonObjectFree(key_obj);
 389                 in_parse = 1;
 390                 set = 0;
 391         }
 392
 393         if(!done)
 394                 return json_handle_error(string, index,
 395                         "json_parse_json_object(): object not closed");
 396
 397         return 0;
 398 }
 399
 400
 401
 402 /* when done, index will point to the character after the closing quote */
 403 int json_parse_json_string(char* string, unsigned long* index, jsonObject* obj, int current_strlen) {
 404         if( ! string || ! index || *index >= current_strlen ) return -1;
 405
 406         int in_escape = 0;
 407         int done = 0;
 408         growing_buffer* buf = buffer_init(64);
 409
 410         while(*index < current_strlen) {
 411
 412                 char c = string[*index];
 413
 414                 switch(c) {
 415
 416                         case '\\':
 417                                 if(in_escape) {
 418                                         buffer_add(buf, "\\");
 419                                         in_escape = 0;
 420                                 } else
 421                                         in_escape = 1;
 422                                 break;
 423
 424                         case '"':
 425                                 if(in_escape) {
 426                                         buffer_add(buf, "\"");
 427                                         in_escape = 0;
 428                                 } else
 429                                         done = 1;
 430                                 break;
 431
 432                         case 't':
 433                                 if(in_escape) {
 434                                         buffer_add(buf,"\t");
 435                                         in_escape = 0;
 436                                 } else
 437                                         buffer_add_char(buf, c);
 438                                 break;
 439
 440                         case 'b':
 441                                 if(in_escape) {
 442                                         buffer_add(buf,"\b");
 443                                         in_escape = 0;
 444                                 } else
 445                                         buffer_add_char(buf, c);
 446                                 break;
 447
 448                         case 'f':
 449                                 if(in_escape) {
 450                                         buffer_add(buf,"\f");
 451                                         in_escape = 0;
 452                                 } else
 453                                         buffer_add_char(buf, c);
 454                                 break;
 455
 456                         case 'r':
 457                                 if(in_escape) {
 458                                         buffer_add(buf,"\r");
 459                                         in_escape = 0;
 460                                 } else
 461                                         buffer_add_char(buf, c);
 462                                 break;
 463
 464                         case 'n':
 465                                 if(in_escape) {
 466                                         buffer_add(buf,"\n");
 467                                         in_escape = 0;
 468                                 } else
 469                                         buffer_add_char(buf, c);
 470                                 break;
 471
 472                         case 'u':
 473                                 if(in_escape) {
 474                                         (*index)++;
 475
 476                                         if(*index >= (current_strlen - 4)) {
 477                                                 buffer_free(buf);
 478                                                 return json_handle_error(string, index,
 479                                                         "json_parse_json_string(): truncated escaped unicode"); }
 480
 481                                         /* ----------------------------------------------------------------------- */
 482                                         /* ----------------------------------------------------------------------- */
 483                                         /* The following chunk was borrowed with permission from
 484                                                 json-c http://oss.metaparadigm.com/json-c/ */
 485                                         unsigned char utf_out[3] = { '\0', '\0', '\0' };
 486
 487                                         #define hexdigit(x) ( ((x) <= '9') ? (x) - '0' : ((x) & 7) + 9)
 488
 489                                         unsigned int ucs_char =
 490                                                 (hexdigit(string[*index] ) << 12) +
 491                                                 (hexdigit(string[*index + 1]) << 8) +
 492                                                 (hexdigit(string[*index + 2]) << 4) +
 493                                                 hexdigit(string[*index + 3]);
 494
 495                                         if (ucs_char < 0x80) {
 496                                                 utf_out[0] = ucs_char;
 497                                                 buffer_add(buf, (char*) utf_out);
 498
 499                                         } else if (ucs_char < 0x800) {
 500                                                 utf_out[0] = 0xc0 | (ucs_char >> 6);
 501                                                 utf_out[1] = 0x80 | (ucs_char & 0x3f);
 502                                                 buffer_add(buf, (char*) utf_out);
 503
 504                                         } else {
 505                                                 utf_out[0] = 0xe0 | (ucs_char >> 12);
 506                                                 utf_out[1] = 0x80 | ((ucs_char >> 6) & 0x3f);
 507                                                 utf_out[2] = 0x80 | (ucs_char & 0x3f);
 508                                                 buffer_add(buf, (char*) utf_out);
 509                                         }
 510                                         /* ----------------------------------------------------------------------- */
 511                                         /* ----------------------------------------------------------------------- */
 512
 513                                         (*index) += 3;
 514                                         in_escape = 0;
 515
 516                                 } else {
 517
 518                                         buffer_add_char(buf, c);
 519                                 }
 520
 521                                 break;
 522
 523                         default:
 524                                 buffer_add_char(buf, c);
 525                 }
 526
 527                 (*index)++;
 528                 if(done) break;
 529         }
 530
 531         jsonObjectSetString(obj, buf->buf);
 532         buffer_free(buf);
 533         return 0;
 534 }
 535
 536
 537 void json_eat_ws(char* string, unsigned long* index, int eat_all, int current_strlen) {
 538         if( ! string || ! index ) return;
 539         if(*index >= current_strlen)
 540                 return;
 541
 542         if( eat_all ) { /* removes newlines, etc */
 543                 while(string[*index] == ' '     ||
 544                                 string[*index] == '\n'  ||
 545                                 string[*index] == '\t')
 546                         (*index)++;
 547         }
 548
 549         else
 550                 while(string[*index] == ' ') (*index)++;
 551 }
 552
 553
 554 /* index should be at the '*' character at the beginning of the comment.
 555  * when done, index will point to the first character after the final /
 556  */
 557 int json_eat_comment(char* string, unsigned long* index, char** buffer, int parse_class, int current_strlen) {
 558         if( ! string || ! index || *index >= current_strlen ) return -1;
 559
 560
 561         if(string[*index] != '*' && string[*index] != '/' )
 562                 return json_handle_error(string, index,
 563                         "json_eat_comment(): invalid character after /");
 564
 565         /* chop out any // style comments */
 566         if(string[*index] == '/') {
 567                 (*index)++;
 568                 char c = string[*index];
 569                 while(*index < current_strlen) {
 570                         (*index)++;
 571                         if(c == '\n')
 572                                 return 0;
 573                         c = string[*index];
 574                 }
 575                 return 0;
 576         }
 577
 578         (*index)++;
 579
 580         int on_star                     = 0; /* true if we just saw a '*' character */
 581
 582         /* we're just past the '*' */
 583         if(!parse_class) { /* we're not concerned with class hints */
 584                 while(*index < current_strlen) {
 585                         if(string[*index] == '/') {
 586                                 if(on_star) {
 587                                         (*index)++;
 588                                         return 0;
 589                                 }
 590                         }
 591
 592                         if(string[*index] == '*') on_star = 1;
 593                         else on_star = 0;
 594
 595                         (*index)++;
 596                 }
 597                 return 0;
 598         }
 599
 600
 601
 602         growing_buffer* buf = buffer_init(64);
 603
 604         int first_dash          = 0;
 605         int second_dash = 0;
 606         int third_dash          = 0;
 607         int fourth_dash = 0;
 608
 609         int in_hint                     = 0;
 610         int done                                = 0;
 611
 612         /*--S hint--*/   /* <-- Hints  look like this */
 613         /*--E hint--*/
 614
 615         while(*index < current_strlen) {
 616                 char c = string[*index];
 617
 618                 switch(c) {
 619
 620                         case '-':
 621                                 on_star = 0;
 622                                 if(third_dash)                  fourth_dash = 1;
 623                                 else if(in_hint)                third_dash      = 1;
 624                                 else if(first_dash)     second_dash = 1;
 625                                 else                                            first_dash = 1;
 626                                 break;
 627
 628                         case 'S':
 629                                 on_star = 0;
 630                                 if(second_dash && !in_hint) {
 631                                         (*index)++;
 632                                         json_eat_ws(string, index, 1, current_strlen);
 633                                         (*index)--; /* this will get incremented at the bottom of the loop */
 634                                         in_hint = 1;
 635                                         break;
 636                                 }
 637
 638                                 if(second_dash && in_hint) {
 639                                         buffer_add_char(buf, c);
 640                                         break;
 641                                 }
 642
 643                         case 'E':
 644                                 on_star = 0;
 645                                 if(second_dash && !in_hint) {
 646                                         (*index)++;
 647                                         json_eat_ws(string, index, 1, current_strlen);
 648                                         (*index)--; /* this will get incremented at the bottom of the loop */
 649                                         in_hint = 1;
 650                                         break;
 651                                 }
 652
 653                                 if(second_dash && in_hint) {
 654                                         buffer_add_char(buf, c);
 655                                         break;
 656                                 }
 657
 658                         case '*':
 659                                 on_star = 1;
 660                                 break;
 661
 662                         case '/':
 663                                 if(on_star)
 664                                         done = 1;
 665                                 else
 666                                 on_star = 0;
 667                                 break;
 668
 669                         default:
 670                                 on_star = 0;
 671                                 if(in_hint)
 672                                         buffer_add_char(buf, c);
 673                 }
 674
 675                 (*index)++;
 676                 if(done) break;
 677         }
 678
 679         if( buf->n_used > 0 && buffer)
 680                 *buffer = buffer_data(buf);
 681
 682         buffer_free(buf);
 683         return 0;
 684 }
 685
 686 int json_handle_error(char* string, unsigned long* index, char* err_msg) {
 687
 688         char buf[60];
 689         osrf_clearbuf(buf, sizeof(buf));
 690
 691         if(*index > 30)
 692                 strncpy( buf, string + (*index - 30), sizeof(buf) - 1 );
 693         else
 694                 strncpy( buf, string, sizeof(buf) - 1 );
 695
 696         buf[ sizeof(buf) - 1 ] = '\0';
 697
 698         fprintf(stderr,
 699                         "\nError parsing json string at charracter %c "
 700                         "(code %d) and index %ld\nString length: %d\nMsg:\t%s\nNear:\t%s\nFull String:\t%s\n",
 701                         string[*index], string[*index], *index, current_strlen, err_msg, buf, string );
 702
 703         return -1;
 704 }
 705
 706 char* legacy_jsonObjectToJSON( const jsonObject* obj ) {
 707
 708         if(obj == NULL) return strdup("null");
 709
 710         growing_buffer* buf = buffer_init(64);
 711
 712         /* add class hints if we have a class name */
 713         if(obj->classname) {
 714                 buffer_add(buf,"/*--S ");
 715                 buffer_add(buf,obj->classname);
 716                 buffer_add(buf, "--*/");
 717         }
 718
 719         switch( obj->type ) {
 720
 721                 case JSON_BOOL:
 722                         if(obj->value.b) buffer_add(buf, "true");
 723                         else buffer_add(buf, "false");
 724                         break;
 725
 726                 case JSON_NUMBER: {
 727                         buffer_add(buf, obj->value.s);
 728                         break;
 729                 }
 730
 731                 case JSON_NULL:
 732                         buffer_add(buf, "null");
 733                         break;
 734
 735                 case JSON_STRING:
 736                         buffer_add(buf, "\"");
 737                         char* data = obj->value.s;
 738                         int len = strlen(data);
 739
 740                         char* output = uescape(data, len, 1);
 741                         buffer_add(buf, output);
 742                         free(output);
 743                         buffer_add(buf, "\"");
 744                         break;
 745
 746                 case JSON_ARRAY:
 747                         buffer_add(buf, "[");
 748                         int i;
 749                         for( i = 0; i!= obj->size; i++ ) {
 750                                 const jsonObject* x = jsonObjectGetIndex(obj,i);
 751                                 char* data = legacy_jsonObjectToJSON(x);
 752                                 buffer_add(buf, data);
 753                                 free(data);
 754                                 if(i != obj->size - 1)
 755                                         buffer_add(buf, ",");
 756                         }
 757                         buffer_add(buf, "]");
 758                         break;
 759
 760                 case JSON_HASH:
 761
 762                         buffer_add(buf, "{");
 763                         jsonIterator* itr = jsonNewIterator(obj);
 764                         jsonObject* tmp;
 765
 766                         while( (tmp = jsonIteratorNext(itr)) ) {
 767
 768                                 buffer_add(buf, "\"");
 769
 770                                 const char* key = itr->key;
 771                                 int len = strlen(key);
 772                                 char* output = uescape(key, len, 1);
 773                                 buffer_add(buf, output);
 774                                 free(output);
 775
 776                                 buffer_add(buf, "\":");
 777                                 char* data =  legacy_jsonObjectToJSON(tmp);
 778                                 buffer_add(buf, data);
 779                                 if(jsonIteratorHasNext(itr))
 780                                         buffer_add(buf, ",");
 781                                 free(data);
 782                         }
 783
 784                         jsonIteratorFree(itr);
 785                         buffer_add(buf, "}");
 786                         break;
 787
 788                         default:
 789                                 fprintf(stderr, "Unknown object type %d\n", obj->type);
 790                                 break;
 791
 792         }
 793
 794         /* close out the object hint */
 795         if(obj->classname) {
 796                 buffer_add(buf, "/*--E ");
 797                 buffer_add(buf, obj->classname);
 798                 buffer_add(buf, "--*/");
 799         }
 800
 801         char* data = buffer_data(buf);
 802         buffer_free(buf);
 803         return data;
 804 }
 805
 806
 807
 808 static jsonObjectNode* makeNode(jsonObject* obj, unsigned long index, char* key) {
 809     jsonObjectNode* node = safe_malloc(sizeof(jsonObjectNode));
 810     node->item = obj;
 811     node->index = index;
 812     node->key = key;
 813     return node;
 814 }
 815
 816 jsonObjectIterator* jsonNewObjectIterator(const jsonObject* obj) {
 817         if(!obj) return NULL;
 818         jsonObjectIterator* itr = safe_malloc(sizeof(jsonObjectIterator));
 819     itr->iterator = jsonNewIterator(obj);
 820         itr->obj = obj;
 821     itr->done = 0;
 822     itr->current = NULL;
 823         return itr;
 824 }
 825
 826 jsonObjectNode* jsonObjectIteratorNext( jsonObjectIterator* itr ) {
 827         if(itr == NULL || itr->done) return NULL;
 828
 829     if(itr->current) free(itr->current);
 830     jsonObject* next = jsonIteratorNext(itr->iterator);
 831     if(next == NULL) {
 832         itr->current = NULL;
 833         itr->done = 1;
 834         return NULL;
 835     }
 836     itr->current = makeNode(next, itr->iterator->index, itr->iterator->key);
 837     return itr->current;
 838 }
 839
 840 void jsonObjectIteratorFree(jsonObjectIterator* iter) {
 841     if(iter->current) free(iter->current);
 842     jsonIteratorFree(iter->iterator);
 843         free(iter);
 844 }
 845
 846 int jsonObjectIteratorHasNext(const jsonObjectIterator* itr) {
 847         return (itr && itr->current);
 848 }
 849
 850