lib/librte_cfgfile/rte_cfgfile.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <rte_common.h>
  40
  41 #include "rte_cfgfile.h"
  42
  43 struct rte_cfgfile_section {
  44         char name[CFG_NAME_LEN];
  45         int num_entries;
  46         int allocated_entries;
  47         struct rte_cfgfile_entry *entries;
  48 };
  49
  50 struct rte_cfgfile {
  51         int flags;
  52         int num_sections;
  53         int allocated_sections;
  54         struct rte_cfgfile_section *sections;
  55 };
  56
  57 /** when we resize a file structure, how many extra entries
  58  * for new sections do we add in */
  59 #define CFG_ALLOC_SECTION_BATCH 8
  60 /** when we resize a section structure, how many extra entries
  61  * for new entries do we add in */
  62 #define CFG_ALLOC_ENTRY_BATCH 16
  63
  64 /**
  65  * Default cfgfile load parameters.
  66  */
  67 static const struct rte_cfgfile_parameters default_cfgfile_params = {
  68         .comment_character = CFG_DEFAULT_COMMENT_CHARACTER,
  69 };
  70
  71 /**
  72  * Defines the list of acceptable comment characters supported by this
  73  * library.
  74  */
  75 static const char valid_comment_chars[] = {
  76         '!',
  77         '#',
  78         '%',
  79         ';',
  80         '@'
  81 };
  82
  83 static unsigned
  84 _strip(char *str, unsigned len)
  85 {
  86         int newlen = len;
  87         if (len == 0)
  88                 return 0;
  89
  90         if (isspace(str[len-1])) {
  91                 /* strip trailing whitespace */
  92                 while (newlen > 0 && isspace(str[newlen - 1]))
  93                         str[--newlen] = '\0';
  94         }
  95
  96         if (isspace(str[0])) {
  97                 /* strip leading whitespace */
  98                 int i, start = 1;
  99                 while (isspace(str[start]) && start < newlen)
 100                         start++
 101                         ; /* do nothing */
 102                 newlen -= start;
 103                 for (i = 0; i < newlen; i++)
 104                         str[i] = str[i+start];
 105                 str[i] = '\0';
 106         }
 107         return newlen;
 108 }
 109
 110 static struct rte_cfgfile_section *
 111 _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 112 {
 113         int i;
 114
 115         for (i = 0; i < cfg->num_sections; i++) {
 116                 if (strncmp(cfg->sections[i].name, sectionname,
 117                                 sizeof(cfg->sections[0].name)) == 0)
 118                         return &cfg->sections[i];
 119         }
 120         return NULL;
 121 }
 122
 123 static int
 124 _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 125                 const char *entryvalue)
 126 {
 127         /* resize entry structure if we don't have room for more entries */
 128         if (section->num_entries == section->allocated_entries) {
 129                 struct rte_cfgfile_entry *n_entries = realloc(
 130                                 section->entries,
 131                                 sizeof(struct rte_cfgfile_entry) *
 132                                 ((section->allocated_entries) +
 133                                                 CFG_ALLOC_ENTRY_BATCH));
 134
 135                 if (n_entries == NULL)
 136                         return -ENOMEM;
 137
 138                 section->entries = n_entries;
 139                 section->allocated_entries += CFG_ALLOC_ENTRY_BATCH;
 140         }
 141         /* fill up entry fields with key name and value */
 142         struct rte_cfgfile_entry *curr_entry =
 143                                         &section->entries[section->num_entries];
 144
 145         snprintf(curr_entry->name, sizeof(curr_entry->name), "%s", entryname);
 146         snprintf(curr_entry->value,
 147                                 sizeof(curr_entry->value), "%s", entryvalue);
 148         section->num_entries++;
 149
 150         return 0;
 151 }
 152
 153 static int
 154 rte_cfgfile_check_params(const struct rte_cfgfile_parameters *params)
 155 {
 156         unsigned int valid_comment;
 157         unsigned int i;
 158
 159         if (!params) {
 160                 printf("Error - missing cfgfile parameters\n");
 161                 return -EINVAL;
 162         }
 163
 164         valid_comment = 0;
 165         for (i = 0; i < RTE_DIM(valid_comment_chars); i++) {
 166                 if (params->comment_character == valid_comment_chars[i]) {
 167                         valid_comment = 1;
 168                         break;
 169                 }
 170         }
 171
 172         if (valid_comment == 0) {
 173                 printf("Error - invalid comment characters %c\n",
 174                        params->comment_character);
 175                 return -ENOTSUP;
 176         }
 177
 178         return 0;
 179 }
 180
 181 struct rte_cfgfile *
 182 rte_cfgfile_load(const char *filename, int flags)
 183 {
 184         return rte_cfgfile_load_with_params(filename, flags,
 185                                             &default_cfgfile_params);
 186 }
 187
 188 struct rte_cfgfile *
 189 rte_cfgfile_load_with_params(const char *filename, int flags,
 190                              const struct rte_cfgfile_parameters *params)
 191 {
 192         char buffer[CFG_NAME_LEN + CFG_VALUE_LEN + 4] = {0};
 193         int lineno = 0;
 194         struct rte_cfgfile *cfg = NULL;
 195
 196         if (rte_cfgfile_check_params(params))
 197                 return NULL;
 198
 199         FILE *f = fopen(filename, "r");
 200         if (f == NULL)
 201                 return NULL;
 202
 203         cfg = rte_cfgfile_create(flags);
 204
 205         while (fgets(buffer, sizeof(buffer), f) != NULL) {
 206                 char *pos = NULL;
 207                 size_t len = strnlen(buffer, sizeof(buffer));
 208                 lineno++;
 209                 if ((len >= sizeof(buffer) - 1) && (buffer[len-1] != '\n')) {
 210                         printf("Error line %d - no \\n found on string. "
 211                                         "Check if line too long\n", lineno);
 212                         goto error1;
 213                 }
 214                 /* skip parsing if comment character found */
 215                 pos = memchr(buffer, params->comment_character, len);
 216                 if (pos != NULL && (*(pos-1) != '\\')) {
 217                         *pos = '\0';
 218                         len = pos -  buffer;
 219                 }
 220
 221                 len = _strip(buffer, len);
 222                 /* skip lines without useful content */
 223                 if (buffer[0] != '[' && memchr(buffer, '=', len) == NULL)
 224                         continue;
 225
 226                 if (buffer[0] == '[') {
 227                         /* section heading line */
 228                         char *end = memchr(buffer, ']', len);
 229                         if (end == NULL) {
 230                                 printf("Error line %d - no terminating ']'"
 231                                         "character found\n", lineno);
 232                                 goto error1;
 233                         }
 234                         *end = '\0';
 235                         _strip(&buffer[1], end - &buffer[1]);
 236
 237                         rte_cfgfile_add_section(cfg, &buffer[1]);
 238                 } else {
 239                         /* key and value line */
 240                         char *split[2] = {NULL};
 241
 242                         split[0] = buffer;
 243                         split[1] = memchr(buffer, '=', len);
 244                         if (split[1] == NULL) {
 245                                 printf("Error line %d - no '='"
 246                                         "character found\n", lineno);
 247                                 goto error1;
 248                         }
 249                         *split[1] = '\0';
 250                         split[1]++;
 251
 252                         _strip(split[0], strlen(split[0]));
 253                         _strip(split[1], strlen(split[1]));
 254                         char *end = memchr(split[1], '\\', strlen(split[1]));
 255
 256                         while (end != NULL) {
 257                                 if (*(end+1) == params->comment_character) {
 258                                         *end = '\0';
 259                                         strcat(split[1], end+1);
 260                                 } else
 261                                         end++;
 262                                 end = memchr(end, '\\', strlen(end));
 263                         }
 264
 265                         if (!(flags & CFG_FLAG_EMPTY_VALUES) &&
 266                                         (*split[1] == '\0')) {
 267                                 printf("Error at line %d - cannot use empty "
 268                                                         "values\n", lineno);
 269                                 goto error1;
 270                         }
 271
 272                         if (cfg->num_sections == 0)
 273                                 goto error1;
 274
 275                         _add_entry(&cfg->sections[cfg->num_sections - 1],
 276                                         split[0], split[1]);
 277                 }
 278         }
 279         fclose(f);
 280         return cfg;
 281 error1:
 282         rte_cfgfile_close(cfg);
 283         fclose(f);
 284         return NULL;
 285 }
 286
 287 struct rte_cfgfile *
 288 rte_cfgfile_create(int flags)
 289 {
 290         int i;
 291         struct rte_cfgfile *cfg = NULL;
 292
 293         cfg = malloc(sizeof(*cfg));
 294
 295         if (cfg == NULL)
 296                 return NULL;
 297
 298         cfg->flags = flags;
 299         cfg->num_sections = 0;
 300
 301         /* allocate first batch of sections and entries */
 302         cfg->sections = malloc(sizeof(struct rte_cfgfile_section) *
 303                         CFG_ALLOC_SECTION_BATCH);
 304
 305         if (cfg->sections == NULL)
 306                 return NULL;
 307
 308         cfg->allocated_sections = CFG_ALLOC_SECTION_BATCH;
 309
 310         for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
 311                 cfg->sections[i].entries = malloc(sizeof(
 312                         struct rte_cfgfile_entry) * CFG_ALLOC_ENTRY_BATCH);
 313
 314                 if (cfg->sections[i].entries == NULL)
 315                         return NULL;
 316
 317                 cfg->sections[i].num_entries = 0;
 318                 cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 319         }
 320
 321         if (flags & CFG_FLAG_GLOBAL_SECTION)
 322                 rte_cfgfile_add_section(cfg, "GLOBAL");
 323         return cfg;
 324 }
 325
 326 int
 327 rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 328 {
 329         int i;
 330
 331         if (cfg == NULL)
 332                 return -EINVAL;
 333
 334         if (sectionname == NULL)
 335                 return -EINVAL;
 336
 337         /* resize overall struct if we don't have room for more sections */
 338         if (cfg->num_sections == cfg->allocated_sections) {
 339
 340                 struct rte_cfgfile_section *n_sections =
 341                                 realloc(cfg->sections,
 342                                 sizeof(struct rte_cfgfile_section) *
 343                                 ((cfg->allocated_sections) +
 344                                 CFG_ALLOC_SECTION_BATCH));
 345
 346                 if (n_sections == NULL)
 347                         return -ENOMEM;
 348
 349                 for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
 350                         n_sections[i + cfg->allocated_sections].num_entries = 0;
 351                         n_sections[i +
 352                                  cfg->allocated_sections].allocated_entries = 0;
 353                         n_sections[i + cfg->allocated_sections].entries = NULL;
 354                 }
 355                 cfg->sections = n_sections;
 356                 cfg->allocated_sections += CFG_ALLOC_SECTION_BATCH;
 357         }
 358
 359         snprintf(cfg->sections[cfg->num_sections].name,
 360                         sizeof(cfg->sections[0].name), "%s", sectionname);
 361         cfg->sections[cfg->num_sections].num_entries = 0;
 362         cfg->num_sections++;
 363
 364         return 0;
 365 }
 366
 367 int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 368                 const char *sectionname, const char *entryname,
 369                 const char *entryvalue)
 370 {
 371         int ret;
 372
 373         if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL)
 374                         || (entryvalue == NULL))
 375                 return -EINVAL;
 376
 377         if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
 378                 return -EEXIST;
 379
 380         /* search for section pointer by sectionname */
 381         struct rte_cfgfile_section *curr_section = _get_section(cfg,
 382                                                                 sectionname);
 383         if (curr_section == NULL)
 384                 return -EINVAL;
 385
 386         ret = _add_entry(curr_section, entryname, entryvalue);
 387
 388         return ret;
 389 }
 390
 391 int rte_cfgfile_set_entry(struct rte_cfgfile *cfg, const char *sectionname,
 392                 const char *entryname, const char *entryvalue)
 393 {
 394         int i;
 395
 396         if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL))
 397                 return -EINVAL;
 398
 399         /* search for section pointer by sectionname */
 400         struct rte_cfgfile_section *curr_section = _get_section(cfg,
 401                                                                 sectionname);
 402         if (curr_section == NULL)
 403                 return -EINVAL;
 404
 405         if (entryvalue == NULL)
 406                 entryvalue = "";
 407
 408         for (i = 0; i < curr_section->num_entries; i++)
 409                 if (!strcmp(curr_section->entries[i].name, entryname)) {
 410                         snprintf(curr_section->entries[i].value,
 411                                         sizeof(curr_section->entries[i].value),
 412                                                         "%s", entryvalue);
 413                         return 0;
 414                 }
 415         printf("Error - entry name doesn't exist\n");
 416         return -EINVAL;
 417 }
 418
 419 int rte_cfgfile_save(struct rte_cfgfile *cfg, const char *filename)
 420 {
 421         int i, j;
 422
 423         if ((cfg == NULL) || (filename == NULL))
 424                 return -EINVAL;
 425
 426         FILE *f = fopen(filename, "w");
 427
 428         if (f == NULL)
 429                 return -EINVAL;
 430
 431         for (i = 0; i < cfg->num_sections; i++) {
 432                 fprintf(f, "[%s]\n", cfg->sections[i].name);
 433
 434                 for (j = 0; j < cfg->sections[i].num_entries; j++) {
 435                         fprintf(f, "%s=%s\n",
 436                                         cfg->sections[i].entries[j].name,
 437                                         cfg->sections[i].entries[j].value);
 438                 }
 439         }
 440         return fclose(f);
 441 }
 442
 443 int rte_cfgfile_close(struct rte_cfgfile *cfg)
 444 {
 445         int i;
 446
 447         if (cfg == NULL)
 448                 return -1;
 449
 450         if (cfg->sections != NULL) {
 451                 for (i = 0; i < cfg->allocated_sections; i++) {
 452                         if (cfg->sections[i].entries != NULL) {
 453                                 free(cfg->sections[i].entries);
 454                                 cfg->sections[i].entries = NULL;
 455                         }
 456                 }
 457                 free(cfg->sections);
 458                 cfg->sections = NULL;
 459         }
 460         free(cfg);
 461         cfg = NULL;
 462
 463         return 0;
 464 }
 465
 466 int
 467 rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sectionname,
 468 size_t length)
 469 {
 470         int i;
 471         int num_sections = 0;
 472         for (i = 0; i < cfg->num_sections; i++) {
 473                 if (strncmp(cfg->sections[i].name, sectionname, length) == 0)
 474                         num_sections++;
 475         }
 476         return num_sections;
 477 }
 478
 479 int
 480 rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
 481         int max_sections)
 482 {
 483         int i;
 484
 485         for (i = 0; i < cfg->num_sections && i < max_sections; i++)
 486                 snprintf(sections[i], CFG_NAME_LEN, "%s",
 487                 cfg->sections[i].name);
 488
 489         return i;
 490 }
 491
 492 int
 493 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
 494 {
 495         return _get_section(cfg, sectionname) != NULL;
 496 }
 497
 498 int
 499 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 500         const char *sectionname)
 501 {
 502         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
 503         if (s == NULL)
 504                 return -1;
 505         return s->num_entries;
 506 }
 507
 508 int
 509 rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
 510         char *sectionname, int index)
 511 {
 512         if (index < 0 || index >= cfg->num_sections)
 513                 return -1;
 514
 515         const struct rte_cfgfile_section *sect = &(cfg->sections[index]);
 516
 517         snprintf(sectionname, CFG_NAME_LEN, "%s", sect->name);
 518         return sect->num_entries;
 519 }
 520 int
 521 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 522                 struct rte_cfgfile_entry *entries, int max_entries)
 523 {
 524         int i;
 525         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 526         if (sect == NULL)
 527                 return -1;
 528         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 529                 entries[i] = sect->entries[i];
 530         return i;
 531 }
 532
 533 int
 534 rte_cfgfile_section_entries_by_index(struct rte_cfgfile *cfg, int index,
 535                 char *sectionname,
 536                 struct rte_cfgfile_entry *entries, int max_entries)
 537 {
 538         int i;
 539         const struct rte_cfgfile_section *sect;
 540
 541         if (index < 0 || index >= cfg->num_sections)
 542                 return -1;
 543         sect = &cfg->sections[index];
 544         snprintf(sectionname, CFG_NAME_LEN, "%s", sect->name);
 545         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 546                 entries[i] = sect->entries[i];
 547         return i;
 548 }
 549
 550 const char *
 551 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
 552                 const char *entryname)
 553 {
 554         int i;
 555         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 556         if (sect == NULL)
 557                 return NULL;
 558         for (i = 0; i < sect->num_entries; i++)
 559                 if (strncmp(sect->entries[i].name, entryname, CFG_NAME_LEN)
 560                                                                         == 0)
 561                         return sect->entries[i].value;
 562         return NULL;
 563 }
 564
 565 int
 566 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 567                 const char *entryname)
 568 {
 569         return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 570 }