lnet/utils/lnetconfig/cyaml.c

   1 /*
   2  * LGPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License as
   8  * published by the Free Software Foundation; either version 2.1 of the
   9  * License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  * LGPL HEADER END
  20  *
  21  * Copyright (c) 2014, 2015, Intel Corporation.
  22  *
  23  * Author:
  24  *   Amir Shehata <amir.shehata@intel.com>
  25  */
  26
  27 /*
  28  *  The cYAML tree is constructed as an n-tree.
  29  *  root -> cmd 1
  30  *          ||
  31  *          \/
  32  *          cmd 2 -> attr1 -> attr2
  33  *                              ||
  34  *                              \/
  35  *                            attr2.1 -> attr2.1.1 -> attr2.1.2
  36  */
  37
  38 #include <yaml.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <stdio.h>
  42 #include <math.h>
  43 #include <stdlib.h>
  44 #include <float.h>
  45 #include <limits.h>
  46 #include <ctype.h>
  47 #include "libcfs/util/list.h"
  48 #include <cyaml.h>
  49
  50 #define INDENT          4
  51 #define EXTRA_IND       2
  52
  53 /*
  54  * cYAML_print_info
  55  *   This structure contains print information
  56  *   required when printing the node
  57  */
  58 struct cYAML_print_info {
  59         int level;
  60         int array_first_elem;
  61         int extra_ind;
  62 };
  63
  64 /*
  65  *  cYAML_ll
  66  *  Linked list of different trees representing YAML
  67  *  documents.
  68  */
  69 struct cYAML_ll {
  70         struct list_head list;
  71         struct cYAML *obj;
  72         struct cYAML_print_info *print_info;
  73 };
  74
  75 static void print_value(FILE *f, struct list_head *stack);
  76
  77 enum cYAML_handler_error {
  78         CYAML_ERROR_NONE = 0,
  79         CYAML_ERROR_UNEXPECTED_STATE = -1,
  80         CYAML_ERROR_NOT_SUPPORTED = -2,
  81         CYAML_ERROR_OUT_OF_MEM = -3,
  82         CYAML_ERROR_BAD_VALUE = -4,
  83         CYAML_ERROR_PARSE = -5,
  84 };
  85
  86 enum cYAML_tree_state {
  87         TREE_STATE_COMPLETE = 0,
  88         TREE_STATE_INITED,
  89         TREE_STATE_TREE_STARTED,
  90         TREE_STATE_BLK_STARTED,
  91         TREE_STATE_KEY,
  92         TREE_STATE_KEY_FILLED,
  93         TREE_STATE_VALUE,
  94         TREE_STATE_SEQ_START,
  95 };
  96
  97 struct cYAML_tree_node {
  98         struct cYAML *root;
  99         /* cur is the current node we're operating on */
 100         struct cYAML *cur;
 101         enum cYAML_tree_state state;
 102         int from_blk_map_start;
 103         /* represents the tree depth */
 104         struct list_head ll;
 105 };
 106
 107 typedef enum cYAML_handler_error (*yaml_token_handler)(yaml_token_t *token,
 108                                                 struct cYAML_tree_node *);
 109
 110 static enum cYAML_handler_error yaml_parse_error(yaml_token_t *token,
 111                                         struct cYAML_tree_node *tree);
 112 static enum cYAML_handler_error yaml_stream_start(yaml_token_t *token,
 113                                         struct cYAML_tree_node *tree);
 114 static enum cYAML_handler_error yaml_stream_end(yaml_token_t *token,
 115                                         struct cYAML_tree_node *tree);
 116 static enum cYAML_handler_error yaml_not_supported(yaml_token_t *token,
 117                                                 struct cYAML_tree_node *tree);
 118 static enum cYAML_handler_error yaml_document_start(yaml_token_t *token,
 119                                                 struct cYAML_tree_node *tree);
 120 static enum cYAML_handler_error yaml_document_end(yaml_token_t *token,
 121                                                struct cYAML_tree_node *tree);
 122 static enum cYAML_handler_error yaml_blk_seq_start(yaml_token_t *token,
 123                                                 struct cYAML_tree_node *tree);
 124 static enum cYAML_handler_error yaml_blk_mapping_start(yaml_token_t *token,
 125                                                 struct cYAML_tree_node *tree);
 126 static enum cYAML_handler_error yaml_block_end(yaml_token_t *token,
 127                                         struct cYAML_tree_node *tree);
 128 static enum cYAML_handler_error yaml_key(yaml_token_t *token,
 129                                 struct cYAML_tree_node *tree);
 130 static enum cYAML_handler_error yaml_value(yaml_token_t *token,
 131                                         struct cYAML_tree_node *tree);
 132 static enum cYAML_handler_error yaml_scalar(yaml_token_t *token,
 133                                         struct cYAML_tree_node *tree);
 134 static enum cYAML_handler_error yaml_entry_token(yaml_token_t *token,
 135                                         struct cYAML_tree_node *tree);
 136
 137 /* dispatch table */
 138 static yaml_token_handler dispatch_tbl[] = {
 139         [YAML_NO_TOKEN] = yaml_parse_error,
 140         [YAML_STREAM_START_TOKEN] = yaml_stream_start,
 141         [YAML_STREAM_END_TOKEN] = yaml_stream_end,
 142         [YAML_VERSION_DIRECTIVE_TOKEN] = yaml_not_supported,
 143         [YAML_TAG_DIRECTIVE_TOKEN] = yaml_not_supported,
 144         [YAML_DOCUMENT_START_TOKEN] = yaml_document_start,
 145         [YAML_DOCUMENT_END_TOKEN] = yaml_document_end,
 146         [YAML_BLOCK_SEQUENCE_START_TOKEN] = yaml_blk_seq_start,
 147         [YAML_BLOCK_MAPPING_START_TOKEN] = yaml_blk_mapping_start,
 148         [YAML_BLOCK_END_TOKEN] = yaml_block_end,
 149         [YAML_FLOW_SEQUENCE_START_TOKEN] = yaml_not_supported,
 150         [YAML_FLOW_SEQUENCE_END_TOKEN] = yaml_not_supported,
 151         [YAML_FLOW_MAPPING_START_TOKEN] = yaml_not_supported,
 152         [YAML_FLOW_MAPPING_END_TOKEN] = yaml_not_supported,
 153         [YAML_BLOCK_ENTRY_TOKEN] = yaml_entry_token,
 154         [YAML_FLOW_ENTRY_TOKEN] = yaml_not_supported,
 155         [YAML_KEY_TOKEN] = yaml_key,
 156         [YAML_VALUE_TOKEN] = yaml_value,
 157         [YAML_ALIAS_TOKEN] = yaml_not_supported,
 158         [YAML_ANCHOR_TOKEN] = yaml_not_supported,
 159         [YAML_TAG_TOKEN] = yaml_not_supported,
 160         [YAML_SCALAR_TOKEN] = yaml_scalar,
 161 };
 162
 163 /* dispatch table */
 164 static char *token_type_string[] = {
 165         [YAML_NO_TOKEN] = "YAML_NO_TOKEN",
 166         [YAML_STREAM_START_TOKEN] = "YAML_STREAM_START_TOKEN",
 167         [YAML_STREAM_END_TOKEN] = "YAML_STREAM_END_TOKEN",
 168         [YAML_VERSION_DIRECTIVE_TOKEN] = "YAML_VERSION_DIRECTIVE_TOKEN",
 169         [YAML_TAG_DIRECTIVE_TOKEN] = "YAML_TAG_DIRECTIVE_TOKEN",
 170         [YAML_DOCUMENT_START_TOKEN] = "YAML_DOCUMENT_START_TOKEN",
 171         [YAML_DOCUMENT_END_TOKEN] = "YAML_DOCUMENT_END_TOKEN",
 172         [YAML_BLOCK_SEQUENCE_START_TOKEN] = "YAML_BLOCK_SEQUENCE_START_TOKEN",
 173         [YAML_BLOCK_MAPPING_START_TOKEN] = "YAML_BLOCK_MAPPING_START_TOKEN",
 174         [YAML_BLOCK_END_TOKEN] = "YAML_BLOCK_END_TOKEN",
 175         [YAML_FLOW_SEQUENCE_START_TOKEN] = "YAML_FLOW_SEQUENCE_START_TOKEN",
 176         [YAML_FLOW_SEQUENCE_END_TOKEN] = "YAML_FLOW_SEQUENCE_END_TOKEN",
 177         [YAML_FLOW_MAPPING_START_TOKEN] = "YAML_FLOW_MAPPING_START_TOKEN",
 178         [YAML_FLOW_MAPPING_END_TOKEN] = "YAML_FLOW_MAPPING_END_TOKEN",
 179         [YAML_BLOCK_ENTRY_TOKEN] = "YAML_BLOCK_ENTRY_TOKEN",
 180         [YAML_FLOW_ENTRY_TOKEN] = "YAML_FLOW_ENTRY_TOKEN",
 181         [YAML_KEY_TOKEN] = "YAML_KEY_TOKEN",
 182         [YAML_VALUE_TOKEN] = "YAML_VALUE_TOKEN",
 183         [YAML_ALIAS_TOKEN] = "YAML_ALIAS_TOKEN",
 184         [YAML_ANCHOR_TOKEN] = "YAML_ANCHOR_TOKEN",
 185         [YAML_TAG_TOKEN] = "YAML_TAG_TOKEN",
 186         [YAML_SCALAR_TOKEN] = "YAML_SCALAR_TOKEN",
 187 };
 188
 189 static char *state_string[] = {
 190         [TREE_STATE_COMPLETE] = "COMPLETE",
 191         [TREE_STATE_INITED] = "INITED",
 192         [TREE_STATE_TREE_STARTED] = "TREE_STARTED",
 193         [TREE_STATE_BLK_STARTED] = "BLK_STARTED",
 194         [TREE_STATE_KEY] = "KEY",
 195         [TREE_STATE_KEY_FILLED] = "KEY_FILLED",
 196         [TREE_STATE_VALUE] = "VALUE",
 197         [TREE_STATE_SEQ_START] = "SEQ_START",
 198 };
 199
 200 static void cYAML_ll_free(struct list_head *ll)
 201 {
 202         struct cYAML_ll *node, *tmp;
 203
 204         list_for_each_entry_safe(node, tmp, ll, list) {
 205                 free(node->print_info);
 206                 free(node);
 207         }
 208 }
 209
 210 static int cYAML_ll_push(struct cYAML *obj,
 211                          const struct cYAML_print_info *print_info,
 212                          struct list_head *list)
 213 {
 214         struct cYAML_ll *node = calloc(1, sizeof(*node));
 215         if (node == NULL)
 216                 return -1;
 217
 218         INIT_LIST_HEAD(&node->list);
 219
 220         if (print_info) {
 221                 node->print_info = calloc(1, sizeof(*print_info));
 222                 if (node->print_info == NULL) {
 223                         free(node);
 224                         return -1;
 225                 }
 226                 *node->print_info = *print_info;
 227         }
 228         node->obj = obj;
 229
 230         list_add(&node->list, list);
 231
 232         return 0;
 233 }
 234
 235 static struct cYAML *cYAML_ll_pop(struct list_head *list,
 236                                   struct cYAML_print_info **print_info)
 237 {
 238         struct cYAML_ll *pop;
 239         struct cYAML *obj = NULL;
 240
 241         if (!list_empty(list)) {
 242                 pop = list_entry(list->next, struct cYAML_ll, list);
 243
 244                 obj = pop->obj;
 245                 if (print_info != NULL)
 246                         *print_info = pop->print_info;
 247                 list_del(&pop->list);
 248
 249                 if (print_info == NULL)
 250                         free(pop->print_info);
 251
 252                 free(pop);
 253         }
 254         return obj;
 255 }
 256
 257 static int cYAML_ll_count(struct list_head *ll)
 258 {
 259         int i = 0;
 260         struct list_head *node;
 261
 262         list_for_each(node, ll)
 263                 i++;
 264
 265         return i;
 266 }
 267
 268 static int cYAML_tree_init(struct cYAML_tree_node *tree)
 269 {
 270         struct cYAML *obj = NULL, *cur = NULL;
 271
 272         if (tree == NULL)
 273                 return -1;
 274
 275         obj = calloc(1, sizeof(*obj));
 276         if (obj == NULL)
 277                 return -1;
 278
 279         if (tree->root) {
 280                 /* append the node */
 281                 cur = tree->root;
 282                 while (cur->cy_next != NULL)
 283                         cur = cur->cy_next;
 284                 cur->cy_next = obj;
 285         } else {
 286                 tree->root = obj;
 287         }
 288
 289         obj->cy_type = CYAML_TYPE_OBJECT;
 290
 291         tree->cur = obj;
 292         tree->state = TREE_STATE_COMPLETE;
 293
 294         /* free it and start anew */
 295         if (!list_empty(&tree->ll))
 296                 cYAML_ll_free(&tree->ll);
 297
 298         return 0;
 299 }
 300
 301 static struct cYAML *create_child(struct cYAML *parent)
 302 {
 303         struct cYAML *obj;
 304
 305         if (parent == NULL)
 306                 return NULL;
 307
 308         obj = calloc(1, sizeof(*obj));
 309         if (obj == NULL)
 310                 return NULL;
 311
 312         /* set the type to OBJECT and let the value change that */
 313         obj->cy_type = CYAML_TYPE_OBJECT;
 314
 315         parent->cy_child = obj;
 316
 317         return obj;
 318 }
 319
 320 static struct cYAML *create_sibling(struct cYAML *sibling)
 321 {
 322         struct cYAML *obj;
 323
 324         if (sibling == NULL)
 325                 return NULL;
 326
 327         obj = calloc(1, sizeof(*obj));
 328         if (obj == NULL)
 329                 return NULL;
 330
 331         /* set the type to OBJECT and let the value change that */
 332         obj->cy_type = CYAML_TYPE_OBJECT;
 333
 334         sibling->cy_next = obj;
 335         obj->cy_prev = sibling;
 336
 337         return obj;
 338 }
 339
 340 /* Parse the input text to generate a number,
 341  * and populate the result into item. */
 342 static bool parse_number(struct cYAML *item, const char *input)
 343 {
 344         double n = 0, sign = 1, scale = 0;
 345         int subscale = 0, signsubscale = 1;
 346         const char *num = input;
 347
 348         if (*num == '-') {
 349                 sign = -1;
 350                 num++;
 351         }
 352
 353         if (*num == '0')
 354                 num++;
 355
 356         if (*num >= '1' && *num <= '9') {
 357                 do {
 358                         n = (n * 10.0) + (*num++ - '0');
 359                 } while (*num >= '0' && *num <= '9');
 360         }
 361
 362         if (*num == '.' && num[1] >= '0' && num[1] <= '9') {
 363                 num++;
 364                 do {
 365                         n = (n * 10.0) + (*num++ - '0');
 366                         scale--;
 367                 } while (*num >= '0' && *num <= '9');
 368         }
 369
 370         if (*num == 'e' || *num == 'E') {
 371                 num++;
 372                 if (*num == '+') {
 373                         num++;
 374                 } else if (*num == '-') {
 375                         signsubscale = -1;
 376                         num++;
 377                 }
 378                 while (*num >= '0' && *num <= '9')
 379                         subscale = (subscale * 10) + (*num++ - '0');
 380         }
 381
 382         /* check to see if the entire string is consumed.  If not then
 383          * that means this is a string with a number in it */
 384         if (num != (input + strlen(input)))
 385                 return false;
 386
 387         /* number = +/- number.fraction * 10^+/- exponent */
 388         n = sign * n * pow(10.0, (scale + subscale * signsubscale));
 389
 390         item->cy_valuedouble = n;
 391         item->cy_valueint = (int)n;
 392         item->cy_type = CYAML_TYPE_NUMBER;
 393
 394         return true;
 395 }
 396
 397 static int assign_type_value(struct cYAML *obj, const char *value)
 398 {
 399         if (value == NULL)
 400                 return -1;
 401
 402         if (strcmp(value, "null") == 0)
 403                 obj->cy_type = CYAML_TYPE_NULL;
 404         else if (strcmp(value, "false") == 0) {
 405                 obj->cy_type = CYAML_TYPE_FALSE;
 406                 obj->cy_valueint = 0;
 407         } else if (strcmp(value, "true") == 0) {
 408                 obj->cy_type = CYAML_TYPE_TRUE;
 409                 obj->cy_valueint = 1;
 410         } else if (*value == '-' || (*value >= '0' && *value <= '9')) {
 411                 if (parse_number(obj, value) == 0) {
 412                         obj->cy_valuestring = strdup(value);
 413                         obj->cy_type = CYAML_TYPE_STRING;
 414                 }
 415         } else {
 416                 obj->cy_valuestring = strdup(value);
 417                 obj->cy_type = CYAML_TYPE_STRING;
 418         }
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * yaml_handle_token
 425  *  Builds the YAML tree rpresentation as the tokens are passed in
 426  *
 427  *  if token == STREAM_START && tree_state != COMPLETE
 428  *    something wrong. fail.
 429  *  else tree_state = INITIED
 430  *  if token == DOCUMENT_START && tree_state != COMPLETE || INITED
 431  *    something wrong, fail.
 432  *  else tree_state = TREE_STARTED
 433  *  if token == DOCUMENT_END
 434  *    tree_state = INITED if no STREAM START, else tree_state = COMPLETE
 435  *    erase everything on ll
 436  *  if token == STREAM_END && tree_state != INITED
 437  *    something wrong fail.
 438  *  else tree_state = COMPLETED
 439  *  if token == YAML_KEY_TOKEN && state != TREE_STARTED
 440  *    something wrong, fail.
 441  *  if token == YAML_SCALAR_TOKEN && state != KEY || VALUE
 442  *    fail.
 443  *  else if tree_state == KEY
 444  *     create a new sibling under the current head of the ll (if ll is
 445  *     empty insert the new node there and it becomes the root.)
 446  *    add the scalar value in the "string"
 447  *    tree_state = KEY_FILLED
 448  *  else if tree_state == VALUE
 449  *    try and figure out whether this is a double, int or string and store
 450  *    it appropriately
 451  *    state = TREE_STARTED
 452  * else if token == YAML_BLOCK_MAPPING_START_TOKEN && tree_state != VALUE
 453  *   fail
 454  * else push the current node on the ll && state = TREE_STARTED
 455  * if token == YAML_BLOCK_END_TOKEN && state != TREE_STARTED
 456  *   fail.
 457  * else pop the current token off the ll and make it the cur
 458  * if token == YAML_VALUE_TOKEN && state != KEY_FILLED
 459  *   fail.
 460  * else state = VALUE
 461  *
 462  */
 463 static enum cYAML_handler_error yaml_parse_error(yaml_token_t *token,
 464                                                  struct cYAML_tree_node *tree)
 465 {
 466         return CYAML_ERROR_PARSE;
 467 }
 468
 469 static enum cYAML_handler_error yaml_stream_start(yaml_token_t *token,
 470                                                   struct cYAML_tree_node *tree)
 471 {
 472         enum cYAML_handler_error rc;
 473
 474         /* with each new stream initialize a new tree */
 475         rc = cYAML_tree_init(tree);
 476
 477         if (rc != CYAML_ERROR_NONE)
 478                 return rc;
 479
 480         tree->state = TREE_STATE_INITED;
 481
 482         return CYAML_ERROR_NONE;
 483 }
 484
 485 static enum cYAML_handler_error yaml_stream_end(yaml_token_t *token,
 486                                                 struct cYAML_tree_node *tree)
 487 {
 488         if (tree->state != TREE_STATE_TREE_STARTED &&
 489             tree->state != TREE_STATE_COMPLETE &&
 490             tree->state != TREE_STATE_INITED)
 491                 return CYAML_ERROR_UNEXPECTED_STATE;
 492
 493         tree->state = TREE_STATE_INITED;
 494
 495         return CYAML_ERROR_NONE;
 496 }
 497
 498 static enum cYAML_handler_error
 499 yaml_document_start(yaml_token_t *token, struct cYAML_tree_node *tree)
 500 {
 501         if (tree->state != TREE_STATE_INITED)
 502                 return CYAML_ERROR_UNEXPECTED_STATE;
 503
 504         /* go to started state since we're expecting more tokens to come */
 505         tree->state = TREE_STATE_TREE_STARTED;
 506
 507         return CYAML_ERROR_NONE;
 508 }
 509
 510 static enum cYAML_handler_error yaml_document_end(yaml_token_t *token,
 511                                                   struct cYAML_tree_node *tree)
 512 {
 513         if (tree->state != TREE_STATE_COMPLETE)
 514                 return CYAML_ERROR_UNEXPECTED_STATE;
 515
 516         tree->state = TREE_STATE_TREE_STARTED;
 517
 518         return CYAML_ERROR_NONE;
 519 }
 520
 521 static enum cYAML_handler_error yaml_key(yaml_token_t *token,
 522                                          struct cYAML_tree_node *tree)
 523 {
 524         if (tree->state != TREE_STATE_BLK_STARTED &&
 525             tree->state != TREE_STATE_VALUE)
 526                 return CYAML_ERROR_UNEXPECTED_STATE;
 527
 528         if (tree->from_blk_map_start == 0 ||
 529             tree->state == TREE_STATE_VALUE)
 530                 tree->cur = create_sibling(tree->cur);
 531
 532         tree->from_blk_map_start = 0;
 533
 534         tree->state = TREE_STATE_KEY;
 535
 536         return CYAML_ERROR_NONE;
 537 }
 538
 539 static enum cYAML_handler_error yaml_scalar(yaml_token_t *token,
 540                                             struct cYAML_tree_node *tree)
 541 {
 542         if (tree->state == TREE_STATE_KEY) {
 543                 /* assign the scalar value to the key that was created */
 544                 tree->cur->cy_string =
 545                   strdup((const char *)token->data.scalar.value);
 546
 547                 tree->state = TREE_STATE_KEY_FILLED;
 548         } else if (tree->state == TREE_STATE_VALUE) {
 549                 if (assign_type_value(tree->cur,
 550                                       (char *)token->data.scalar.value))
 551                         /* failed to assign a value */
 552                         return CYAML_ERROR_BAD_VALUE;
 553                 tree->state = TREE_STATE_BLK_STARTED;
 554         } else {
 555                 return CYAML_ERROR_UNEXPECTED_STATE;
 556         }
 557
 558         return CYAML_ERROR_NONE;
 559 }
 560
 561 static enum cYAML_handler_error yaml_value(yaml_token_t *token,
 562                                            struct cYAML_tree_node *tree)
 563 {
 564         if (tree->state != TREE_STATE_KEY_FILLED)
 565                 return CYAML_ERROR_UNEXPECTED_STATE;
 566
 567         tree->state = TREE_STATE_VALUE;
 568
 569         return CYAML_ERROR_NONE;
 570 }
 571
 572 static enum cYAML_handler_error yaml_blk_seq_start(yaml_token_t *token,
 573                                                    struct cYAML_tree_node *tree)
 574 {
 575         if (tree->state != TREE_STATE_VALUE)
 576                 return CYAML_ERROR_UNEXPECTED_STATE;
 577
 578         /* Since a sequenc start event determines that this is the start
 579          * of an array, then that means the current node we're at is an
 580          * array and we need to flag it as such */
 581         tree->cur->cy_type = CYAML_TYPE_ARRAY;
 582         tree->state = TREE_STATE_SEQ_START;
 583
 584         return CYAML_ERROR_NONE;
 585 }
 586
 587 static enum cYAML_handler_error yaml_entry_token(yaml_token_t *token,
 588                                                  struct cYAML_tree_node *tree)
 589 {
 590         struct cYAML *obj;
 591
 592         if (tree->state != TREE_STATE_SEQ_START &&
 593             tree->state != TREE_STATE_BLK_STARTED)
 594                 return CYAML_ERROR_UNEXPECTED_STATE;
 595
 596         if (tree->state == TREE_STATE_SEQ_START) {
 597                 obj = create_child(tree->cur);
 598
 599                 if (cYAML_ll_push(tree->cur, NULL, &tree->ll))
 600                         return CYAML_ERROR_OUT_OF_MEM;
 601
 602                 tree->cur = obj;
 603         } else {
 604                 tree->cur = create_sibling(tree->cur);
 605                 tree->state = TREE_STATE_SEQ_START;
 606         }
 607
 608         return CYAML_ERROR_NONE;
 609 }
 610
 611 static enum cYAML_handler_error
 612 yaml_blk_mapping_start(yaml_token_t *token,
 613                        struct cYAML_tree_node *tree)
 614 {
 615         struct cYAML *obj;
 616
 617         if (tree->state != TREE_STATE_VALUE &&
 618             tree->state != TREE_STATE_INITED &&
 619             tree->state != TREE_STATE_SEQ_START &&
 620             tree->state != TREE_STATE_TREE_STARTED)
 621                 return CYAML_ERROR_UNEXPECTED_STATE;
 622
 623         /* block_mapping_start means we're entering another block
 624          * indentation, so we need to go one level deeper
 625          * create a child of cur */
 626         obj = create_child(tree->cur);
 627
 628         /* push cur on the stack */
 629         if (cYAML_ll_push(tree->cur, NULL, &tree->ll))
 630                 return CYAML_ERROR_OUT_OF_MEM;
 631
 632         /* adding the new child to cur */
 633         tree->cur = obj;
 634
 635         tree->state = TREE_STATE_BLK_STARTED;
 636
 637         tree->from_blk_map_start = 1;
 638
 639         return CYAML_ERROR_NONE;
 640 }
 641
 642 static enum cYAML_handler_error yaml_block_end(yaml_token_t *token,
 643                                                struct cYAML_tree_node *tree)
 644 {
 645         if (tree->state != TREE_STATE_BLK_STARTED &&
 646             tree->state != TREE_STATE_VALUE)
 647                 return CYAML_ERROR_UNEXPECTED_STATE;
 648
 649         tree->cur = cYAML_ll_pop(&tree->ll, NULL);
 650
 651         /* if you have popped all the way to the top level, then move to
 652          * the complete state. */
 653         if (cYAML_ll_count(&tree->ll) == 0)
 654                 tree->state = TREE_STATE_COMPLETE;
 655         else if (tree->state == TREE_STATE_VALUE)
 656                 tree->state = TREE_STATE_BLK_STARTED;
 657
 658         return CYAML_ERROR_NONE;
 659 }
 660
 661 static enum cYAML_handler_error yaml_not_supported(yaml_token_t *token,
 662                                                    struct cYAML_tree_node *tree)
 663 {
 664         return CYAML_ERROR_NOT_SUPPORTED;
 665 }
 666
 667 static bool clean_usr_data(struct cYAML *node, void *usr_data, void **out)
 668 {
 669         cYAML_user_data_free_cb free_cb = usr_data;
 670
 671         if (free_cb && node && node->cy_user_data) {
 672                 free_cb(node->cy_user_data);
 673                 node->cy_user_data = NULL;
 674         }
 675
 676         return true;
 677 }
 678
 679 static bool free_node(struct cYAML *node, void *user_data, void **out)
 680 {
 681         if (node)
 682                 free(node);
 683
 684         return true;
 685 }
 686
 687 static bool find_obj_iter(struct cYAML *node, void *usr_data, void **out)
 688 {
 689         char *name = usr_data;
 690
 691         if (node != NULL && node->cy_string != NULL &&
 692             strcmp(node->cy_string, name) == 0) {
 693                 *out = node;
 694                 return false;
 695         }
 696
 697         return true;
 698 }
 699
 700 struct cYAML *cYAML_get_object_item(struct cYAML *parent, const char *name)
 701 {
 702         struct cYAML *node = parent, *found = NULL;
 703
 704         if (!node || !name)
 705                 return NULL;
 706
 707         if (node->cy_string) {
 708                 if (strcmp(node->cy_string, name) == 0)
 709                         return node;
 710         }
 711
 712         if (node->cy_child)
 713                 found = cYAML_get_object_item(node->cy_child, name);
 714
 715         if (!found && node->cy_next)
 716                 found = cYAML_get_object_item(node->cy_next, name);
 717
 718         return found;
 719 }
 720
 721 struct cYAML *cYAML_get_next_seq_item(struct cYAML *seq, struct cYAML **itm)
 722 {
 723         if (*itm != NULL && (*itm)->cy_next != NULL) {
 724                 *itm = (*itm)->cy_next;
 725                 return *itm;
 726         }
 727
 728         if (*itm == NULL && seq->cy_type == CYAML_TYPE_ARRAY) {
 729                 *itm = seq->cy_child;
 730                 return *itm;
 731         }
 732
 733         return NULL;
 734 }
 735
 736 bool cYAML_is_sequence(struct cYAML *node)
 737 {
 738         return (node != NULL ? node->cy_type == CYAML_TYPE_ARRAY : 0);
 739 }
 740
 741 void cYAML_tree_recursive_walk(struct cYAML *node, cYAML_walk_cb cb,
 742                                       bool cb_first,
 743                                       void *usr_data,
 744                                       void **out)
 745 {
 746         if (node == NULL)
 747                 return;
 748
 749         if (cb_first) {
 750                 if (!cb(node, usr_data, out))
 751                         return;
 752         }
 753
 754         if (node->cy_child)
 755                 cYAML_tree_recursive_walk(node->cy_child, cb,
 756                                           cb_first, usr_data, out);
 757
 758         if (node->cy_next)
 759                 cYAML_tree_recursive_walk(node->cy_next, cb,
 760                                           cb_first, usr_data, out);
 761
 762         if (!cb_first) {
 763                 if (!cb(node, usr_data, out))
 764                         return;
 765         }
 766 }
 767
 768 struct cYAML *cYAML_find_object(struct cYAML *root, const char *name)
 769 {
 770         struct cYAML *found = NULL;
 771
 772         cYAML_tree_recursive_walk(root, find_obj_iter, true,
 773                                   (void *)name, (void **)&found);
 774
 775         return found;
 776 }
 777
 778 void cYAML_clean_usr_data(struct cYAML *node, cYAML_user_data_free_cb free_cb)
 779 {
 780         cYAML_tree_recursive_walk(node, clean_usr_data, false, free_cb, NULL);
 781 }
 782
 783 void cYAML_free_tree(struct cYAML *node)
 784 {
 785         cYAML_tree_recursive_walk(node, free_node, false, NULL, NULL);
 786 }
 787
 788 static inline void print_simple(FILE *f, struct cYAML *node,
 789                                 struct cYAML_print_info *cpi)
 790 {
 791         int level = cpi->level;
 792         int ind = cpi->extra_ind;
 793
 794         if (cpi->array_first_elem)
 795                 fprintf(f, "%*s- ", INDENT * level, "");
 796
 797         fprintf(f, "%*s""%s: %d\n", (cpi->array_first_elem) ? 0 :
 798                 INDENT * level + ind, "", node->cy_string,
 799                 node->cy_valueint);
 800 }
 801
 802 static void print_string(FILE *f, struct cYAML *node,
 803                          struct cYAML_print_info *cpi)
 804 {
 805         char *new_line;
 806         int level = cpi->level;
 807         int ind = cpi->extra_ind;
 808
 809         if (cpi->array_first_elem)
 810                 fprintf(f, "%*s- ", INDENT * level, "");
 811
 812         new_line = strchr(node->cy_valuestring, '\n');
 813         if (new_line == NULL)
 814                 fprintf(f, "%*s""%s: %s\n", (cpi->array_first_elem) ?
 815                         0 : INDENT * level + ind, "",
 816                         node->cy_string, node->cy_valuestring);
 817         else {
 818                 int indent = 0;
 819                 fprintf(f, "%*s""%s: ", (cpi->array_first_elem) ?
 820                         0 : INDENT * level + ind, "",
 821                         node->cy_string);
 822                 char *l = node->cy_valuestring;
 823                 while (new_line) {
 824                         *new_line = '\0';
 825                         fprintf(f, "%*s""%s\n", indent, "", l);
 826                         indent = INDENT * level + ind +
 827                                   strlen(node->cy_string) + 2;
 828                         *new_line = '\n';
 829                         l = new_line+1;
 830                         new_line = strchr(l, '\n');
 831                 }
 832                 fprintf(f, "%*s""%s\n", indent, "", l);
 833         }
 834 }
 835
 836 static void print_number(FILE *f, struct cYAML *node,
 837                          struct cYAML_print_info *cpi)
 838 {
 839         double d = node->cy_valuedouble;
 840         int level = cpi->level;
 841         int ind = cpi->extra_ind;
 842
 843         if (cpi->array_first_elem)
 844                 fprintf(f, "%*s- ", INDENT * level, "");
 845
 846         if ((fabs(((double)node->cy_valueint) - d) <= DBL_EPSILON) &&
 847             (d <= INT_MAX) && (d >= INT_MIN))
 848                 fprintf(f, "%*s""%s: %d\n", (cpi->array_first_elem) ? 0 :
 849                         INDENT * level + ind, "",
 850                         node->cy_string, node->cy_valueint);
 851         else {
 852                 if ((fabs(floor(d) - d) <= DBL_EPSILON) &&
 853                     (fabs(d) < 1.0e60))
 854                         fprintf(f, "%*s""%s: %.0f\n",
 855                                 (cpi->array_first_elem) ? 0 :
 856                                 INDENT * level + ind, "",
 857                                 node->cy_string, d);
 858                 else if ((fabs(d) < 1.0e-6) || (fabs(d) > 1.0e9))
 859                         fprintf(f, "%*s""%s: %e\n",
 860                                 (cpi->array_first_elem) ? 0 :
 861                                 INDENT * level + ind, "",
 862                                 node->cy_string, d);
 863                 else
 864                         fprintf(f, "%*s""%s: %f\n",
 865                                 (cpi->array_first_elem) ? 0 :
 866                                 INDENT * level + ind, "",
 867                                 node->cy_string, d);
 868         }
 869 }
 870
 871 static void print_object(FILE *f, struct cYAML *node,
 872                          struct list_head *stack,
 873                          struct cYAML_print_info *cpi)
 874 {
 875         struct cYAML_print_info print_info;
 876         struct cYAML *child = node->cy_child;
 877
 878         if (node->cy_string != NULL)
 879                 fprintf(f, "%*s""%s%s:\n", (cpi->array_first_elem) ?
 880                         INDENT * cpi->level :
 881                         INDENT * cpi->level + cpi->extra_ind,
 882                         "", (cpi->array_first_elem) ? "- " : "",
 883                         node->cy_string);
 884
 885         print_info.level = (node->cy_string != NULL) ? cpi->level + 1 :
 886           cpi->level;
 887         print_info.array_first_elem = (node->cy_string == NULL) ?
 888           cpi->array_first_elem : 0;
 889         print_info.extra_ind = (cpi->array_first_elem) ? EXTRA_IND :
 890           cpi->extra_ind;
 891
 892         while (child) {
 893                 if (cYAML_ll_push(child, &print_info, stack) != 0)
 894                         return;
 895                 print_value(f, stack);
 896                 print_info.array_first_elem = 0;
 897                 child = child->cy_next;
 898         }
 899 }
 900
 901 static void print_array(FILE *f, struct cYAML *node,
 902                         struct list_head *stack,
 903                         struct cYAML_print_info *cpi)
 904 {
 905         struct cYAML_print_info print_info;
 906         struct cYAML *child = node->cy_child;
 907
 908         if (node->cy_string != NULL) {
 909                 fprintf(f, "%*s""%s:\n", INDENT * cpi->level + cpi->extra_ind,
 910                         "", node->cy_string);
 911         }
 912
 913         print_info.level = (node->cy_string != NULL) ? cpi->level + 1 :
 914           cpi->level;
 915         print_info.array_first_elem =  1;
 916         print_info.extra_ind = EXTRA_IND;
 917
 918         while (child) {
 919                 if (cYAML_ll_push(child, &print_info, stack) != 0)
 920                         return;
 921                 print_value(f, stack);
 922                 child = child->cy_next;
 923         }
 924 }
 925
 926 static void print_value(FILE *f, struct list_head *stack)
 927 {
 928         struct cYAML_print_info *cpi = NULL;
 929         struct cYAML *node = cYAML_ll_pop(stack, &cpi);
 930
 931         if (node == NULL)
 932                 return;
 933
 934         switch (node->cy_type) {
 935         case CYAML_TYPE_FALSE:
 936         case CYAML_TYPE_TRUE:
 937         case CYAML_TYPE_NULL:
 938                 print_simple(f, node, cpi);
 939                 break;
 940         case CYAML_TYPE_STRING:
 941                 print_string(f, node, cpi);
 942                 break;
 943         case CYAML_TYPE_NUMBER:
 944                 print_number(f, node, cpi);
 945                 break;
 946         case CYAML_TYPE_ARRAY:
 947                 print_array(f, node, stack, cpi);
 948                 break;
 949         case CYAML_TYPE_OBJECT:
 950                 print_object(f, node, stack, cpi);
 951                 break;
 952         default:
 953         break;
 954         }
 955
 956         if (cpi != NULL)
 957                 free(cpi);
 958 }
 959
 960 void cYAML_print_tree(struct cYAML *node)
 961 {
 962         struct cYAML_print_info print_info;
 963         struct list_head list;
 964
 965         INIT_LIST_HEAD(&list);
 966
 967         if (node == NULL)
 968                 return;
 969
 970         memset(&print_info, 0, sizeof(struct cYAML_print_info));
 971
 972         if (cYAML_ll_push(node, &print_info, &list) == 0)
 973                 print_value(stdout, &list);
 974 }
 975
 976 void cYAML_print_tree2file(FILE *f, struct cYAML *node)
 977 {
 978         struct cYAML_print_info print_info;
 979         struct list_head list;
 980
 981         INIT_LIST_HEAD(&list);
 982
 983         if (node == NULL)
 984                 return;
 985
 986         memset(&print_info, 0, sizeof(struct cYAML_print_info));
 987
 988         if (cYAML_ll_push(node, &print_info, &list) == 0)
 989                 print_value(f, &list);
 990 }
 991
 992 static struct cYAML *insert_item(struct cYAML *parent, char *key,
 993                                  enum cYAML_object_type type)
 994 {
 995         struct cYAML *node = calloc(1, sizeof(*node));
 996
 997         if (node == NULL)
 998                 return NULL;
 999
1000         if (key != NULL)
1001                 node->cy_string = strdup(key);
1002
1003         node->cy_type = type;
1004
1005         cYAML_insert_child(parent, node);
1006
1007         return node;
1008 }
1009
1010 struct cYAML *cYAML_create_seq(struct cYAML *parent, char *key)
1011 {
1012         return insert_item(parent, key, CYAML_TYPE_ARRAY);
1013 }
1014
1015 struct cYAML *cYAML_create_seq_item(struct cYAML *seq)
1016 {
1017         return insert_item(seq, NULL, CYAML_TYPE_OBJECT);
1018 }
1019
1020 struct cYAML *cYAML_create_object(struct cYAML *parent, char *key)
1021 {
1022         return insert_item(parent, key, CYAML_TYPE_OBJECT);
1023 }
1024
1025 struct cYAML *cYAML_create_string(struct cYAML *parent, char *key, char *value)
1026 {
1027         struct cYAML *node = calloc(1, sizeof(*node));
1028         if (node == NULL)
1029                 return NULL;
1030
1031         node->cy_string = strdup(key);
1032         node->cy_valuestring = strdup(value);
1033         node->cy_type = CYAML_TYPE_STRING;
1034
1035         cYAML_insert_child(parent, node);
1036
1037         return node;
1038 }
1039
1040 struct cYAML *cYAML_create_number(struct cYAML *parent, char *key, double value)
1041 {
1042         struct cYAML *node = calloc(1, sizeof(*node));
1043         if (node == NULL)
1044                 return NULL;
1045
1046         node->cy_string = strdup(key);
1047         node->cy_valuedouble = value;
1048         node->cy_valueint = (int)value;
1049         node->cy_type = CYAML_TYPE_NUMBER;
1050
1051         cYAML_insert_child(parent, node);
1052
1053         return node;
1054 }
1055
1056 void cYAML_insert_child(struct cYAML *parent, struct cYAML *node)
1057 {
1058         struct cYAML *cur;
1059
1060         if (parent && node) {
1061                 if (parent->cy_child == NULL) {
1062                         parent->cy_child = node;
1063                         return;
1064                 }
1065
1066                 cur = parent->cy_child;
1067
1068                 while (cur->cy_next)
1069                         cur = cur->cy_next;
1070
1071                 cur->cy_next = node;
1072                 node->cy_prev = cur;
1073         }
1074 }
1075
1076 void cYAML_insert_sibling(struct cYAML *root, struct cYAML *sibling)
1077 {
1078         struct cYAML *last = NULL;
1079         if (root == NULL || sibling == NULL)
1080                 return;
1081
1082         last = root;
1083         while (last->cy_next != NULL)
1084                 last = last->cy_next;
1085
1086         last->cy_next = sibling;
1087 }
1088
1089 void cYAML_build_error(int rc, int seq_no, char *cmd,
1090                        char *entity, char *err_str,
1091                        struct cYAML **root)
1092 {
1093         struct cYAML *r = NULL, *err, *s, *itm, *cmd_obj;
1094         if (root == NULL)
1095                 return;
1096
1097         /* add to the tail of the root that's passed in */
1098         if ((*root) == NULL) {
1099                 *root = cYAML_create_object(NULL, NULL);
1100                 if ((*root) == NULL)
1101                         goto failed;
1102         }
1103
1104         r = *root;
1105
1106         /* look for the command */
1107         cmd_obj = cYAML_get_object_item(r, (const char *)cmd);
1108         if (cmd_obj != NULL && cmd_obj->cy_type == CYAML_TYPE_ARRAY)
1109                 itm = cYAML_create_seq_item(cmd_obj);
1110         else if (cmd_obj == NULL) {
1111                 s = cYAML_create_seq(r, cmd);
1112                 itm = cYAML_create_seq_item(s);
1113         } else if (cmd_obj != NULL && cmd_obj->cy_type != CYAML_TYPE_ARRAY)
1114                 goto failed;
1115
1116         err = cYAML_create_object(itm, entity);
1117         if (err == NULL)
1118                 goto failed;
1119
1120         if (seq_no >= 0 &&
1121             cYAML_create_number(err, "seq_no", seq_no) == NULL)
1122                 goto failed;
1123
1124         if (cYAML_create_number(err, "errno", rc) == NULL)
1125                 goto failed;
1126
1127         if (cYAML_create_string(err, "descr", err_str) == NULL)
1128                 goto failed;
1129
1130         return;
1131
1132 failed:
1133         /* Only reason we get here is if we run out of memory */
1134         cYAML_free_tree(r);
1135         r = NULL;
1136         fprintf(stderr, "error:\n\tfatal: out of memory\n");
1137 }
1138
1139 struct cYAML *cYAML_build_tree(char *yaml_file,
1140                                const char *yaml_blk,
1141                                size_t yaml_blk_size,
1142                                struct cYAML **err_rc,
1143                                bool debug)
1144 {
1145         yaml_parser_t parser;
1146         yaml_token_t token;
1147         struct cYAML_tree_node tree;
1148         enum cYAML_handler_error rc;
1149         yaml_token_type_t token_type;
1150         char err_str[256];
1151         FILE *input = NULL;
1152         int done = 0;
1153
1154         memset(&tree, 0, sizeof(struct cYAML_tree_node));
1155
1156         INIT_LIST_HEAD(&tree.ll);
1157
1158         /* Create the Parser object. */
1159         yaml_parser_initialize(&parser);
1160
1161         /* file always takes precedence */
1162         if (yaml_file != NULL) {
1163                 /* Set a file input. */
1164                 input = fopen(yaml_file, "rb");
1165                 if (input == NULL) {
1166                         snprintf(err_str, sizeof(err_str),
1167                                 "Failed to open file: %s", yaml_file);
1168                         cYAML_build_error(-1, -1, "yaml", "builder",
1169                                           err_str,
1170                                           err_rc);
1171                         return NULL;
1172                 }
1173
1174                 yaml_parser_set_input_file(&parser, input);
1175         } else if (yaml_blk != NULL) {
1176                 yaml_parser_set_input_string(&parser,
1177                                              (const unsigned char *) yaml_blk,
1178                                              yaml_blk_size);
1179         } else
1180                 /* assume that we're getting our input froms stdin */
1181                 yaml_parser_set_input_file(&parser, stdin);
1182
1183         /* Read the event sequence. */
1184         while (!done) {
1185                 /*
1186                  * Go through the parser and build a cYAML representation
1187                  * of the passed in YAML text
1188                  */
1189                 yaml_parser_scan(&parser, &token);
1190
1191                 if (debug)
1192                         fprintf(stderr, "tree.state(%p:%d) = %s, token.type ="
1193                                         " %s: %s\n",
1194                                 &tree, tree.state, state_string[tree.state],
1195                                 token_type_string[token.type],
1196                                 (token.type == YAML_SCALAR_TOKEN) ?
1197                                 (char*)token.data.scalar.value : "");
1198                 rc = dispatch_tbl[token.type](&token, &tree);
1199                 if (rc != CYAML_ERROR_NONE) {
1200                         snprintf(err_str, sizeof(err_str),
1201                                 "Failed to handle token:%d "
1202                                 "[state=%d, rc=%d]",
1203                                 token.type, tree.state, rc);
1204                         cYAML_build_error(-1, -1, "yaml", "builder",
1205                                           err_str,
1206                                           err_rc);
1207                 }
1208                 /* Are we finished? */
1209                 done = (rc != CYAML_ERROR_NONE ||
1210                         token.type == YAML_STREAM_END_TOKEN ||
1211                         token.type == YAML_NO_TOKEN);
1212
1213                 token_type = token.type;
1214
1215                 yaml_token_delete(&token);
1216         }
1217
1218         /* Destroy the Parser object. */
1219         yaml_parser_delete(&parser);
1220
1221         if (input != NULL)
1222                 fclose(input);
1223
1224         if (token_type == YAML_STREAM_END_TOKEN &&
1225             rc == CYAML_ERROR_NONE)
1226                 return tree.root;
1227
1228         cYAML_free_tree(tree.root);
1229
1230         return NULL;
1231 }