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, 2017, 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_no_token(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_no_token,
 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
 464 static enum cYAML_handler_error yaml_no_token(yaml_token_t *token,
 465                                               struct cYAML_tree_node *tree)
 466 {
 467         return CYAML_ERROR_NONE;
 468 }
 469
 470 static enum cYAML_handler_error yaml_stream_start(yaml_token_t *token,
 471                                                   struct cYAML_tree_node *tree)
 472 {
 473         enum cYAML_handler_error rc;
 474
 475         /* with each new stream initialize a new tree */
 476         rc = cYAML_tree_init(tree);
 477
 478         if (rc != CYAML_ERROR_NONE)
 479                 return rc;
 480
 481         tree->state = TREE_STATE_INITED;
 482
 483         return CYAML_ERROR_NONE;
 484 }
 485
 486 static enum cYAML_handler_error yaml_stream_end(yaml_token_t *token,
 487                                                 struct cYAML_tree_node *tree)
 488 {
 489         if (tree->state != TREE_STATE_TREE_STARTED &&
 490             tree->state != TREE_STATE_COMPLETE &&
 491             tree->state != TREE_STATE_INITED)
 492                 return CYAML_ERROR_UNEXPECTED_STATE;
 493
 494         tree->state = TREE_STATE_INITED;
 495
 496         return CYAML_ERROR_NONE;
 497 }
 498
 499 static enum cYAML_handler_error
 500 yaml_document_start(yaml_token_t *token, struct cYAML_tree_node *tree)
 501 {
 502         if (tree->state != TREE_STATE_INITED)
 503                 return CYAML_ERROR_UNEXPECTED_STATE;
 504
 505         /* go to started state since we're expecting more tokens to come */
 506         tree->state = TREE_STATE_TREE_STARTED;
 507
 508         return CYAML_ERROR_NONE;
 509 }
 510
 511 static enum cYAML_handler_error yaml_document_end(yaml_token_t *token,
 512                                                   struct cYAML_tree_node *tree)
 513 {
 514         if (tree->state != TREE_STATE_COMPLETE)
 515                 return CYAML_ERROR_UNEXPECTED_STATE;
 516
 517         tree->state = TREE_STATE_TREE_STARTED;
 518
 519         return CYAML_ERROR_NONE;
 520 }
 521
 522 static enum cYAML_handler_error yaml_key(yaml_token_t *token,
 523                                          struct cYAML_tree_node *tree)
 524 {
 525         if (tree->state != TREE_STATE_BLK_STARTED &&
 526             tree->state != TREE_STATE_VALUE)
 527                 return CYAML_ERROR_UNEXPECTED_STATE;
 528
 529         if (tree->from_blk_map_start == 0 ||
 530             tree->state == TREE_STATE_VALUE)
 531                 tree->cur = create_sibling(tree->cur);
 532
 533         tree->from_blk_map_start = 0;
 534
 535         tree->state = TREE_STATE_KEY;
 536
 537         return CYAML_ERROR_NONE;
 538 }
 539
 540 static enum cYAML_handler_error yaml_scalar(yaml_token_t *token,
 541                                             struct cYAML_tree_node *tree)
 542 {
 543         if (tree->state == TREE_STATE_KEY) {
 544                 /* assign the scalar value to the key that was created */
 545                 tree->cur->cy_string =
 546                   strdup((const char *)token->data.scalar.value);
 547
 548                 tree->state = TREE_STATE_KEY_FILLED;
 549         } else if (tree->state == TREE_STATE_VALUE ||
 550                    tree->state == TREE_STATE_SEQ_START) {
 551                 if (assign_type_value(tree->cur,
 552                                       (char *)token->data.scalar.value))
 553                         /* failed to assign a value */
 554                         return CYAML_ERROR_BAD_VALUE;
 555                 tree->state = TREE_STATE_BLK_STARTED;
 556         } else {
 557                 return CYAML_ERROR_UNEXPECTED_STATE;
 558         }
 559
 560         return CYAML_ERROR_NONE;
 561 }
 562
 563 static enum cYAML_handler_error yaml_value(yaml_token_t *token,
 564                                            struct cYAML_tree_node *tree)
 565 {
 566         if (tree->state != TREE_STATE_KEY_FILLED)
 567                 return CYAML_ERROR_UNEXPECTED_STATE;
 568
 569         tree->state = TREE_STATE_VALUE;
 570
 571         return CYAML_ERROR_NONE;
 572 }
 573
 574 static enum cYAML_handler_error yaml_blk_seq_start(yaml_token_t *token,
 575                                                    struct cYAML_tree_node *tree)
 576 {
 577         if (tree->state != TREE_STATE_VALUE)
 578                 return CYAML_ERROR_UNEXPECTED_STATE;
 579
 580         /* Since a sequenc start event determines that this is the start
 581          * of an array, then that means the current node we're at is an
 582          * array and we need to flag it as such */
 583         tree->cur->cy_type = CYAML_TYPE_ARRAY;
 584         tree->state = TREE_STATE_SEQ_START;
 585
 586         return CYAML_ERROR_NONE;
 587 }
 588
 589 static enum cYAML_handler_error yaml_entry_token(yaml_token_t *token,
 590                                                  struct cYAML_tree_node *tree)
 591 {
 592         struct cYAML *obj;
 593
 594         if (tree->state != TREE_STATE_SEQ_START &&
 595             tree->state != TREE_STATE_BLK_STARTED &&
 596             tree->state != TREE_STATE_VALUE)
 597                 return CYAML_ERROR_UNEXPECTED_STATE;
 598
 599         if (tree->state == TREE_STATE_SEQ_START) {
 600                 obj = create_child(tree->cur);
 601
 602                 if (cYAML_ll_push(tree->cur, NULL, &tree->ll))
 603                         return CYAML_ERROR_OUT_OF_MEM;
 604
 605                 tree->cur = obj;
 606         } else {
 607                 tree->cur = create_sibling(tree->cur);
 608                 tree->state = TREE_STATE_SEQ_START;
 609         }
 610
 611         return CYAML_ERROR_NONE;
 612 }
 613
 614 static enum cYAML_handler_error
 615 yaml_blk_mapping_start(yaml_token_t *token,
 616                        struct cYAML_tree_node *tree)
 617 {
 618         struct cYAML *obj;
 619
 620         if (tree->state != TREE_STATE_VALUE &&
 621             tree->state != TREE_STATE_INITED &&
 622             tree->state != TREE_STATE_SEQ_START &&
 623             tree->state != TREE_STATE_TREE_STARTED)
 624                 return CYAML_ERROR_UNEXPECTED_STATE;
 625
 626         /* block_mapping_start means we're entering another block
 627          * indentation, so we need to go one level deeper
 628          * create a child of cur */
 629         obj = create_child(tree->cur);
 630
 631         /* push cur on the stack */
 632         if (cYAML_ll_push(tree->cur, NULL, &tree->ll))
 633                 return CYAML_ERROR_OUT_OF_MEM;
 634
 635         /* adding the new child to cur */
 636         tree->cur = obj;
 637
 638         tree->state = TREE_STATE_BLK_STARTED;
 639
 640         tree->from_blk_map_start = 1;
 641
 642         return CYAML_ERROR_NONE;
 643 }
 644
 645 static enum cYAML_handler_error yaml_block_end(yaml_token_t *token,
 646                                                struct cYAML_tree_node *tree)
 647 {
 648         if (tree->state != TREE_STATE_BLK_STARTED &&
 649             tree->state != TREE_STATE_VALUE)
 650                 return CYAML_ERROR_UNEXPECTED_STATE;
 651
 652         tree->cur = cYAML_ll_pop(&tree->ll, NULL);
 653
 654         /* if you have popped all the way to the top level, then move to
 655          * the complete state. */
 656         if (cYAML_ll_count(&tree->ll) == 0)
 657                 tree->state = TREE_STATE_COMPLETE;
 658         else if (tree->state == TREE_STATE_VALUE)
 659                 tree->state = TREE_STATE_BLK_STARTED;
 660
 661         return CYAML_ERROR_NONE;
 662 }
 663
 664 static enum cYAML_handler_error yaml_not_supported(yaml_token_t *token,
 665                                                    struct cYAML_tree_node *tree)
 666 {
 667         return CYAML_ERROR_NOT_SUPPORTED;
 668 }
 669
 670 static bool clean_usr_data(struct cYAML *node, void *usr_data, void **out)
 671 {
 672         cYAML_user_data_free_cb free_cb = usr_data;
 673
 674         if (free_cb && node && node->cy_user_data) {
 675                 free_cb(node->cy_user_data);
 676                 node->cy_user_data = NULL;
 677         }
 678
 679         return true;
 680 }
 681
 682 static bool free_node(struct cYAML *node, void *user_data, void **out)
 683 {
 684         if (!node)
 685                 return true;
 686
 687         if (node->cy_type == CYAML_TYPE_STRING)
 688                 free(node->cy_valuestring);
 689         if (node->cy_string)
 690                 free(node->cy_string);
 691
 692         free(node);
 693         return true;
 694 }
 695
 696 static bool find_obj_iter(struct cYAML *node, void *usr_data, void **out)
 697 {
 698         char *name = usr_data;
 699
 700         if (node != NULL && node->cy_string != NULL &&
 701             strcmp(node->cy_string, name) == 0) {
 702                 *out = node;
 703                 return false;
 704         }
 705
 706         return true;
 707 }
 708
 709 struct cYAML *cYAML_get_object_item(struct cYAML *parent, const char *name)
 710 {
 711         struct cYAML *node = parent, *found = NULL;
 712
 713         if (!node || !name)
 714                 return NULL;
 715
 716         if (node->cy_string) {
 717                 if (strcmp(node->cy_string, name) == 0)
 718                         return node;
 719         }
 720
 721         if (node->cy_child)
 722                 found = cYAML_get_object_item(node->cy_child, name);
 723
 724         if (!found && node->cy_next)
 725                 found = cYAML_get_object_item(node->cy_next, name);
 726
 727         return found;
 728 }
 729
 730 struct cYAML *cYAML_get_next_seq_item(struct cYAML *seq, struct cYAML **itm)
 731 {
 732         if (*itm != NULL && (*itm)->cy_next != NULL) {
 733                 *itm = (*itm)->cy_next;
 734                 return *itm;
 735         }
 736
 737         if (*itm == NULL && seq->cy_type == CYAML_TYPE_ARRAY) {
 738                 *itm = seq->cy_child;
 739                 return *itm;
 740         }
 741
 742         return NULL;
 743 }
 744
 745 bool cYAML_is_sequence(struct cYAML *node)
 746 {
 747         return (node != NULL ? node->cy_type == CYAML_TYPE_ARRAY : 0);
 748 }
 749
 750 void cYAML_tree_recursive_walk(struct cYAML *node, cYAML_walk_cb cb,
 751                                       bool cb_first,
 752                                       void *usr_data,
 753                                       void **out)
 754 {
 755         if (node == NULL)
 756                 return;
 757
 758         if (cb_first) {
 759                 if (!cb(node, usr_data, out))
 760                         return;
 761         }
 762
 763         if (node->cy_child)
 764                 cYAML_tree_recursive_walk(node->cy_child, cb,
 765                                           cb_first, usr_data, out);
 766
 767         if (node->cy_next)
 768                 cYAML_tree_recursive_walk(node->cy_next, cb,
 769                                           cb_first, usr_data, out);
 770
 771         if (!cb_first) {
 772                 if (!cb(node, usr_data, out))
 773                         return;
 774         }
 775 }
 776
 777 struct cYAML *cYAML_find_object(struct cYAML *root, const char *name)
 778 {
 779         struct cYAML *found = NULL;
 780
 781         cYAML_tree_recursive_walk(root, find_obj_iter, true,
 782                                   (void *)name, (void **)&found);
 783
 784         return found;
 785 }
 786
 787 void cYAML_clean_usr_data(struct cYAML *node, cYAML_user_data_free_cb free_cb)
 788 {
 789         cYAML_tree_recursive_walk(node, clean_usr_data, false, free_cb, NULL);
 790 }
 791
 792 void cYAML_free_tree(struct cYAML *node)
 793 {
 794         cYAML_tree_recursive_walk(node, free_node, false, NULL, NULL);
 795 }
 796
 797 static inline void print_simple(FILE *f, struct cYAML *node,
 798                                 struct cYAML_print_info *cpi)
 799 {
 800         int level = cpi->level;
 801         int ind = cpi->extra_ind;
 802
 803         if (cpi->array_first_elem)
 804                 fprintf(f, "%*s- ", INDENT * level, "");
 805
 806         fprintf(f, "%*s""%s: %" PRId64 "\n", (cpi->array_first_elem) ? 0 :
 807                 INDENT * level + ind, "", node->cy_string,
 808                 node->cy_valueint);
 809 }
 810
 811 static void print_string(FILE *f, struct cYAML *node,
 812                          struct cYAML_print_info *cpi)
 813 {
 814         char *new_line;
 815         int level = cpi->level;
 816         int ind = cpi->extra_ind;
 817
 818         if (cpi->array_first_elem)
 819                 fprintf(f, "%*s- ", INDENT * level, "");
 820
 821         new_line = strchr(node->cy_valuestring, '\n');
 822         if (new_line == NULL)
 823                 fprintf(f, "%*s""%s: %s\n", (cpi->array_first_elem) ?
 824                         0 : INDENT * level + ind, "",
 825                         node->cy_string, node->cy_valuestring);
 826         else {
 827                 int indent = 0;
 828                 fprintf(f, "%*s""%s: ", (cpi->array_first_elem) ?
 829                         0 : INDENT * level + ind, "",
 830                         node->cy_string);
 831                 char *l = node->cy_valuestring;
 832                 while (new_line) {
 833                         *new_line = '\0';
 834                         fprintf(f, "%*s""%s\n", indent, "", l);
 835                         indent = INDENT * level + ind +
 836                                   strlen(node->cy_string) + 2;
 837                         *new_line = '\n';
 838                         l = new_line+1;
 839                         new_line = strchr(l, '\n');
 840                 }
 841                 fprintf(f, "%*s""%s\n", indent, "", l);
 842         }
 843 }
 844
 845 static void print_number(FILE *f, struct cYAML *node,
 846                          struct cYAML_print_info *cpi)
 847 {
 848         double d = node->cy_valuedouble;
 849         int level = cpi->level;
 850         int ind = cpi->extra_ind;
 851
 852         if (cpi->array_first_elem)
 853                 fprintf(f, "%*s- ", INDENT * level, "");
 854
 855         if ((fabs(((double)node->cy_valueint) - d) <= DBL_EPSILON) &&
 856             (d <= INT_MAX) && (d >= INT_MIN))
 857                 fprintf(f, "%*s""%s: %" PRId64 "\n", (cpi->array_first_elem) ? 0 :
 858                         INDENT * level + ind, "",
 859                         node->cy_string, node->cy_valueint);
 860         else {
 861                 if ((fabs(floor(d) - d) <= DBL_EPSILON) &&
 862                     (fabs(d) < 1.0e60))
 863                         fprintf(f, "%*s""%s: %.0f\n",
 864                                 (cpi->array_first_elem) ? 0 :
 865                                 INDENT * level + ind, "",
 866                                 node->cy_string, d);
 867                 else if ((fabs(d) < 1.0e-6) || (fabs(d) > 1.0e9))
 868                         fprintf(f, "%*s""%s: %e\n",
 869                                 (cpi->array_first_elem) ? 0 :
 870                                 INDENT * level + ind, "",
 871                                 node->cy_string, d);
 872                 else
 873                         fprintf(f, "%*s""%s: %f\n",
 874                                 (cpi->array_first_elem) ? 0 :
 875                                 INDENT * level + ind, "",
 876                                 node->cy_string, d);
 877         }
 878 }
 879
 880 static void print_object(FILE *f, struct cYAML *node,
 881                          struct list_head *stack,
 882                          struct cYAML_print_info *cpi)
 883 {
 884         struct cYAML_print_info print_info;
 885         struct cYAML *child = node->cy_child;
 886
 887         if (node->cy_string != NULL)
 888                 fprintf(f, "%*s""%s%s:\n", (cpi->array_first_elem) ?
 889                         INDENT * cpi->level :
 890                         INDENT * cpi->level + cpi->extra_ind,
 891                         "", (cpi->array_first_elem) ? "- " : "",
 892                         node->cy_string);
 893
 894         print_info.level = (node->cy_string != NULL) ? cpi->level + 1 :
 895           cpi->level;
 896         print_info.array_first_elem = (node->cy_string == NULL) ?
 897           cpi->array_first_elem : 0;
 898         print_info.extra_ind = (cpi->array_first_elem) ? EXTRA_IND :
 899           cpi->extra_ind;
 900
 901         while (child) {
 902                 if (cYAML_ll_push(child, &print_info, stack) != 0)
 903                         return;
 904                 print_value(f, stack);
 905                 print_info.array_first_elem = 0;
 906                 child = child->cy_next;
 907         }
 908 }
 909
 910 static void print_array(FILE *f, struct cYAML *node,
 911                         struct list_head *stack,
 912                         struct cYAML_print_info *cpi)
 913 {
 914         struct cYAML_print_info print_info;
 915         struct cYAML *child = node->cy_child;
 916
 917         if (node->cy_string != NULL) {
 918                 fprintf(f, "%*s""%s:\n", INDENT * cpi->level + cpi->extra_ind,
 919                         "", node->cy_string);
 920         }
 921
 922         print_info.level = (node->cy_string != NULL) ? cpi->level + 1 :
 923           cpi->level;
 924         print_info.array_first_elem =  1;
 925         print_info.extra_ind = EXTRA_IND;
 926
 927         while (child) {
 928                 if (cYAML_ll_push(child, &print_info, stack) != 0)
 929                         return;
 930                 print_value(f, stack);
 931                 child = child->cy_next;
 932         }
 933 }
 934
 935 static void print_value(FILE *f, struct list_head *stack)
 936 {
 937         struct cYAML_print_info *cpi = NULL;
 938         struct cYAML *node = cYAML_ll_pop(stack, &cpi);
 939
 940         if (node == NULL)
 941                 return;
 942
 943         switch (node->cy_type) {
 944         case CYAML_TYPE_FALSE:
 945         case CYAML_TYPE_TRUE:
 946         case CYAML_TYPE_NULL:
 947                 print_simple(f, node, cpi);
 948                 break;
 949         case CYAML_TYPE_STRING:
 950                 print_string(f, node, cpi);
 951                 break;
 952         case CYAML_TYPE_NUMBER:
 953                 print_number(f, node, cpi);
 954                 break;
 955         case CYAML_TYPE_ARRAY:
 956                 print_array(f, node, stack, cpi);
 957                 break;
 958         case CYAML_TYPE_OBJECT:
 959                 print_object(f, node, stack, cpi);
 960                 break;
 961         default:
 962         break;
 963         }
 964
 965         if (cpi != NULL)
 966                 free(cpi);
 967 }
 968
 969 void cYAML_print_tree(struct cYAML *node)
 970 {
 971         struct cYAML_print_info print_info;
 972         struct list_head list;
 973
 974         INIT_LIST_HEAD(&list);
 975
 976         if (node == NULL)
 977                 return;
 978
 979         memset(&print_info, 0, sizeof(struct cYAML_print_info));
 980
 981         if (cYAML_ll_push(node, &print_info, &list) == 0)
 982                 print_value(stdout, &list);
 983 }
 984
 985 void cYAML_print_tree2file(FILE *f, struct cYAML *node)
 986 {
 987         struct cYAML_print_info print_info;
 988         struct list_head list;
 989
 990         INIT_LIST_HEAD(&list);
 991
 992         if (node == NULL)
 993                 return;
 994
 995         memset(&print_info, 0, sizeof(struct cYAML_print_info));
 996
 997         if (cYAML_ll_push(node, &print_info, &list) == 0)
 998                 print_value(f, &list);
 999 }
1000
1001 static struct cYAML *insert_item(struct cYAML *parent, char *key,
1002                                  enum cYAML_object_type type)
1003 {
1004         struct cYAML *node = calloc(1, sizeof(*node));
1005
1006         if (node == NULL)
1007                 return NULL;
1008
1009         if (key != NULL)
1010                 node->cy_string = strdup(key);
1011
1012         node->cy_type = type;
1013
1014         cYAML_insert_child(parent, node);
1015
1016         return node;
1017 }
1018
1019 struct cYAML *cYAML_create_seq(struct cYAML *parent, char *key)
1020 {
1021         return insert_item(parent, key, CYAML_TYPE_ARRAY);
1022 }
1023
1024 struct cYAML *cYAML_create_seq_item(struct cYAML *seq)
1025 {
1026         return insert_item(seq, NULL, CYAML_TYPE_OBJECT);
1027 }
1028
1029 struct cYAML *cYAML_create_object(struct cYAML *parent, char *key)
1030 {
1031         return insert_item(parent, key, CYAML_TYPE_OBJECT);
1032 }
1033
1034 struct cYAML *cYAML_create_string(struct cYAML *parent, char *key, char *value)
1035 {
1036         struct cYAML *node = calloc(1, sizeof(*node));
1037         if (node == NULL)
1038                 return NULL;
1039
1040         node->cy_string = strdup(key);
1041         node->cy_valuestring = strdup(value);
1042         node->cy_type = CYAML_TYPE_STRING;
1043
1044         cYAML_insert_child(parent, node);
1045
1046         return node;
1047 }
1048
1049 struct cYAML *cYAML_create_number(struct cYAML *parent, char *key, double value)
1050 {
1051         struct cYAML *node = calloc(1, sizeof(*node));
1052         if (node == NULL)
1053                 return NULL;
1054
1055         node->cy_string = strdup(key);
1056         node->cy_valuedouble = value;
1057         node->cy_valueint = (int)value;
1058         node->cy_type = CYAML_TYPE_NUMBER;
1059
1060         cYAML_insert_child(parent, node);
1061
1062         return node;
1063 }
1064
1065 void cYAML_insert_child(struct cYAML *parent, struct cYAML *node)
1066 {
1067         struct cYAML *cur;
1068
1069         if (parent && node) {
1070                 if (parent->cy_child == NULL) {
1071                         parent->cy_child = node;
1072                         return;
1073                 }
1074
1075                 cur = parent->cy_child;
1076
1077                 while (cur->cy_next)
1078                         cur = cur->cy_next;
1079
1080                 cur->cy_next = node;
1081                 node->cy_prev = cur;
1082         }
1083 }
1084
1085 void cYAML_insert_sibling(struct cYAML *root, struct cYAML *sibling)
1086 {
1087         struct cYAML *last = NULL;
1088         if (root == NULL || sibling == NULL)
1089                 return;
1090
1091         last = root;
1092         while (last->cy_next != NULL)
1093                 last = last->cy_next;
1094
1095         last->cy_next = sibling;
1096 }
1097
1098 void cYAML_build_error(int rc, int seq_no, char *cmd,
1099                        char *entity, char *err_str,
1100                        struct cYAML **root)
1101 {
1102         struct cYAML *r = NULL, *err, *s, *itm, *cmd_obj;
1103         if (root == NULL)
1104                 return;
1105
1106         /* add to the tail of the root that's passed in */
1107         if ((*root) == NULL) {
1108                 *root = cYAML_create_object(NULL, NULL);
1109                 if ((*root) == NULL)
1110                         goto failed;
1111         }
1112
1113         r = *root;
1114
1115         /* look for the command */
1116         cmd_obj = cYAML_get_object_item(r, (const char *)cmd);
1117         if (cmd_obj != NULL && cmd_obj->cy_type == CYAML_TYPE_ARRAY)
1118                 itm = cYAML_create_seq_item(cmd_obj);
1119         else if (cmd_obj == NULL) {
1120                 s = cYAML_create_seq(r, cmd);
1121                 itm = cYAML_create_seq_item(s);
1122         } else if (cmd_obj != NULL && cmd_obj->cy_type != CYAML_TYPE_ARRAY)
1123                 goto failed;
1124
1125         err = cYAML_create_object(itm, entity);
1126         if (err == NULL)
1127                 goto failed;
1128
1129         if (seq_no >= 0 &&
1130             cYAML_create_number(err, "seq_no", seq_no) == NULL)
1131                 goto failed;
1132
1133         if (cYAML_create_number(err, "errno", rc) == NULL)
1134                 goto failed;
1135
1136         if (cYAML_create_string(err, "descr", err_str) == NULL)
1137                 goto failed;
1138
1139         return;
1140
1141 failed:
1142         /* Only reason we get here is if we run out of memory */
1143         cYAML_free_tree(r);
1144         r = NULL;
1145         fprintf(stderr, "error:\n\tfatal: out of memory\n");
1146 }
1147
1148 struct cYAML *cYAML_build_tree(char *yaml_file,
1149                                const char *yaml_blk,
1150                                size_t yaml_blk_size,
1151                                struct cYAML **err_rc,
1152                                bool debug)
1153 {
1154         yaml_parser_t parser;
1155         yaml_token_t token;
1156         struct cYAML_tree_node tree;
1157         enum cYAML_handler_error rc;
1158         yaml_token_type_t token_type;
1159         char err_str[256];
1160         FILE *input = NULL;
1161         int done = 0;
1162
1163         memset(&tree, 0, sizeof(struct cYAML_tree_node));
1164
1165         INIT_LIST_HEAD(&tree.ll);
1166
1167         /* Create the Parser object. */
1168         yaml_parser_initialize(&parser);
1169
1170         /* file always takes precedence */
1171         if (yaml_file != NULL) {
1172                 /* Set a file input. */
1173                 input = fopen(yaml_file, "rb");
1174                 if (input == NULL) {
1175                         snprintf(err_str, sizeof(err_str),
1176                                 "Failed to open file: %s", yaml_file);
1177                         cYAML_build_error(-1, -1, "yaml", "builder",
1178                                           err_str,
1179                                           err_rc);
1180                         return NULL;
1181                 }
1182
1183                 yaml_parser_set_input_file(&parser, input);
1184         } else if (yaml_blk != NULL) {
1185                 yaml_parser_set_input_string(&parser,
1186                                              (const unsigned char *) yaml_blk,
1187                                              yaml_blk_size);
1188         } else
1189                 /* assume that we're getting our input froms stdin */
1190                 yaml_parser_set_input_file(&parser, stdin);
1191
1192         /* Read the event sequence. */
1193         while (!done) {
1194                 /*
1195                  * Go through the parser and build a cYAML representation
1196                  * of the passed in YAML text
1197                  */
1198                 yaml_parser_scan(&parser, &token);
1199
1200                 if (debug)
1201                         fprintf(stderr, "tree.state(%p:%d) = %s, token.type ="
1202                                         " %s: %s\n",
1203                                 &tree, tree.state, state_string[tree.state],
1204                                 token_type_string[token.type],
1205                                 (token.type == YAML_SCALAR_TOKEN) ?
1206                                 (char*)token.data.scalar.value : "");
1207                 rc = dispatch_tbl[token.type](&token, &tree);
1208                 if (rc != CYAML_ERROR_NONE) {
1209                         snprintf(err_str, sizeof(err_str),
1210                                 "Failed to handle token:%d %s [state=%d, rc=%d]",
1211                                  token.type, token_type_string[token.type],
1212                                  tree.state, rc);
1213                         cYAML_build_error(-1, -1, "yaml", "builder",
1214                                           err_str,
1215                                           err_rc);
1216                 }
1217                 /* Are we finished? */
1218                 done = (rc != CYAML_ERROR_NONE ||
1219                         token.type == YAML_STREAM_END_TOKEN);
1220
1221                 token_type = token.type;
1222
1223                 yaml_token_delete(&token);
1224         }
1225
1226         /* Destroy the Parser object. */
1227         yaml_parser_delete(&parser);
1228
1229         if (input != NULL)
1230                 fclose(input);
1231
1232         if (token_type == YAML_STREAM_END_TOKEN &&
1233             rc == CYAML_ERROR_NONE)
1234                 return tree.root;
1235
1236         cYAML_free_tree(tree.root);
1237
1238         return NULL;
1239 }