lib/librte_cfgfile/rte_cfgfile.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <ctype.h>
   9 #include <errno.h>
  10 #include <rte_string_fns.h>
  11 #include <rte_common.h>
  12 #include <rte_log.h>
  13
  14 #include "rte_cfgfile.h"
  15
  16 struct rte_cfgfile_section {
  17         char name[CFG_NAME_LEN];
  18         int num_entries;
  19         int allocated_entries;
  20         struct rte_cfgfile_entry *entries;
  21 };
  22
  23 struct rte_cfgfile {
  24         int flags;
  25         int num_sections;
  26         int allocated_sections;
  27         struct rte_cfgfile_section *sections;
  28 };
  29
  30 RTE_LOG_REGISTER(cfgfile_logtype, lib.cfgfile, INFO);
  31
  32 #define CFG_LOG(level, fmt, args...)                                    \
  33         rte_log(RTE_LOG_ ## level, cfgfile_logtype, "%s(): " fmt "\n",  \
  34                 __func__, ## args)
  35
  36 /** when we resize a file structure, how many extra entries
  37  * for new sections do we add in */
  38 #define CFG_ALLOC_SECTION_BATCH 8
  39 /** when we resize a section structure, how many extra entries
  40  * for new entries do we add in */
  41 #define CFG_ALLOC_ENTRY_BATCH 16
  42
  43 /**
  44  * Default cfgfile load parameters.
  45  */
  46 static const struct rte_cfgfile_parameters default_cfgfile_params = {
  47         .comment_character = CFG_DEFAULT_COMMENT_CHARACTER,
  48 };
  49
  50 /**
  51  * Defines the list of acceptable comment characters supported by this
  52  * library.
  53  */
  54 static const char valid_comment_chars[] = {
  55         '!',
  56         '#',
  57         '%',
  58         ';',
  59         '@'
  60 };
  61
  62 static unsigned
  63 _strip(char *str, unsigned len)
  64 {
  65         int newlen = len;
  66         if (len == 0)
  67                 return 0;
  68
  69         if (isspace(str[len-1])) {
  70                 /* strip trailing whitespace */
  71                 while (newlen > 0 && isspace(str[newlen - 1]))
  72                         str[--newlen] = '\0';
  73         }
  74
  75         if (isspace(str[0])) {
  76                 /* strip leading whitespace */
  77                 int i, start = 1;
  78                 while (isspace(str[start]) && start < newlen)
  79                         start++
  80                         ; /* do nothing */
  81                 newlen -= start;
  82                 for (i = 0; i < newlen; i++)
  83                         str[i] = str[i+start];
  84                 str[i] = '\0';
  85         }
  86         return newlen;
  87 }
  88
  89 static struct rte_cfgfile_section *
  90 _get_section(struct rte_cfgfile *cfg, const char *sectionname)
  91 {
  92         int i;
  93
  94         for (i = 0; i < cfg->num_sections; i++) {
  95                 if (strncmp(cfg->sections[i].name, sectionname,
  96                                 sizeof(cfg->sections[0].name)) == 0)
  97                         return &cfg->sections[i];
  98         }
  99         return NULL;
 100 }
 101
 102 static int
 103 _add_entry(struct rte_cfgfile_section *section, const char *entryname,
 104                 const char *entryvalue)
 105 {
 106         /* resize entry structure if we don't have room for more entries */
 107         if (section->num_entries == section->allocated_entries) {
 108                 struct rte_cfgfile_entry *n_entries = realloc(
 109                                 section->entries,
 110                                 sizeof(struct rte_cfgfile_entry) *
 111                                 ((section->allocated_entries) +
 112                                                 CFG_ALLOC_ENTRY_BATCH));
 113
 114                 if (n_entries == NULL)
 115                         return -ENOMEM;
 116
 117                 section->entries = n_entries;
 118                 section->allocated_entries += CFG_ALLOC_ENTRY_BATCH;
 119         }
 120         /* fill up entry fields with key name and value */
 121         struct rte_cfgfile_entry *curr_entry =
 122                                         &section->entries[section->num_entries];
 123
 124         strlcpy(curr_entry->name, entryname, sizeof(curr_entry->name));
 125         strlcpy(curr_entry->value, entryvalue, sizeof(curr_entry->value));
 126         section->num_entries++;
 127
 128         return 0;
 129 }
 130
 131 static int
 132 rte_cfgfile_check_params(const struct rte_cfgfile_parameters *params)
 133 {
 134         unsigned int valid_comment;
 135         unsigned int i;
 136
 137         if (!params) {
 138                 CFG_LOG(ERR, "missing cfgfile parameters\n");
 139                 return -EINVAL;
 140         }
 141
 142         valid_comment = 0;
 143         for (i = 0; i < RTE_DIM(valid_comment_chars); i++) {
 144                 if (params->comment_character == valid_comment_chars[i]) {
 145                         valid_comment = 1;
 146                         break;
 147                 }
 148         }
 149
 150         if (valid_comment == 0) {
 151                 CFG_LOG(ERR, "invalid comment characters %c\n",
 152                        params->comment_character);
 153                 return -ENOTSUP;
 154         }
 155
 156         return 0;
 157 }
 158
 159 struct rte_cfgfile *
 160 rte_cfgfile_load(const char *filename, int flags)
 161 {
 162         return rte_cfgfile_load_with_params(filename, flags,
 163                                             &default_cfgfile_params);
 164 }
 165
 166 struct rte_cfgfile *
 167 rte_cfgfile_load_with_params(const char *filename, int flags,
 168                              const struct rte_cfgfile_parameters *params)
 169 {
 170         char buffer[CFG_NAME_LEN + CFG_VALUE_LEN + 4];
 171         int lineno = 0;
 172         struct rte_cfgfile *cfg;
 173
 174         if (rte_cfgfile_check_params(params))
 175                 return NULL;
 176
 177         FILE *f = fopen(filename, "r");
 178         if (f == NULL)
 179                 return NULL;
 180
 181         cfg = rte_cfgfile_create(flags);
 182
 183         while (fgets(buffer, sizeof(buffer), f) != NULL) {
 184                 char *pos;
 185                 size_t len = strnlen(buffer, sizeof(buffer));
 186                 lineno++;
 187                 if ((len >= sizeof(buffer) - 1) && (buffer[len-1] != '\n')) {
 188                         CFG_LOG(ERR, " line %d - no \\n found on string. "
 189                                         "Check if line too long\n", lineno);
 190                         goto error1;
 191                 }
 192                 /* skip parsing if comment character found */
 193                 pos = memchr(buffer, params->comment_character, len);
 194                 if (pos != NULL &&
 195                     (pos == buffer || *(pos-1) != '\\')) {
 196                         *pos = '\0';
 197                         len = pos -  buffer;
 198                 }
 199
 200                 len = _strip(buffer, len);
 201                 /* skip lines without useful content */
 202                 if (buffer[0] != '[' && memchr(buffer, '=', len) == NULL)
 203                         continue;
 204
 205                 if (buffer[0] == '[') {
 206                         /* section heading line */
 207                         char *end = memchr(buffer, ']', len);
 208                         if (end == NULL) {
 209                                 CFG_LOG(ERR,
 210                                         "line %d - no terminating ']' character found\n",
 211                                         lineno);
 212                                 goto error1;
 213                         }
 214                         *end = '\0';
 215                         _strip(&buffer[1], end - &buffer[1]);
 216
 217                         rte_cfgfile_add_section(cfg, &buffer[1]);
 218                 } else {
 219                         /* key and value line */
 220                         char *split[2] = {NULL};
 221
 222                         split[0] = buffer;
 223                         split[1] = memchr(buffer, '=', len);
 224                         if (split[1] == NULL) {
 225                                 CFG_LOG(ERR,
 226                                         "line %d - no '=' character found\n",
 227                                         lineno);
 228                                 goto error1;
 229                         }
 230                         *split[1] = '\0';
 231                         split[1]++;
 232
 233                         _strip(split[0], strlen(split[0]));
 234                         _strip(split[1], strlen(split[1]));
 235                         char *end = memchr(split[1], '\\', strlen(split[1]));
 236
 237                         size_t split_len = strlen(split[1]) + 1;
 238                         while (end != NULL) {
 239                                 if (*(end+1) == params->comment_character) {
 240                                         *end = '\0';
 241                                         strlcat(split[1], end+1, split_len);
 242                                 } else
 243                                         end++;
 244                                 end = memchr(end, '\\', strlen(end));
 245                         }
 246
 247                         if (!(flags & CFG_FLAG_EMPTY_VALUES) &&
 248                                         (*split[1] == '\0')) {
 249                                 CFG_LOG(ERR,
 250                                         "line %d - cannot use empty values\n",
 251                                         lineno);
 252                                 goto error1;
 253                         }
 254
 255                         if (cfg->num_sections == 0)
 256                                 goto error1;
 257
 258                         _add_entry(&cfg->sections[cfg->num_sections - 1],
 259                                         split[0], split[1]);
 260                 }
 261         }
 262         fclose(f);
 263         return cfg;
 264 error1:
 265         rte_cfgfile_close(cfg);
 266         fclose(f);
 267         return NULL;
 268 }
 269
 270 struct rte_cfgfile *
 271 rte_cfgfile_create(int flags)
 272 {
 273         int i;
 274         struct rte_cfgfile *cfg;
 275
 276         /* future proof flags usage */
 277         if (flags & ~(CFG_FLAG_GLOBAL_SECTION | CFG_FLAG_EMPTY_VALUES))
 278                 return NULL;
 279
 280         cfg = malloc(sizeof(*cfg));
 281
 282         if (cfg == NULL)
 283                 return NULL;
 284
 285         cfg->flags = flags;
 286         cfg->num_sections = 0;
 287
 288         /* allocate first batch of sections and entries */
 289         cfg->sections = calloc(CFG_ALLOC_SECTION_BATCH,
 290                                sizeof(struct rte_cfgfile_section));
 291         if (cfg->sections == NULL)
 292                 goto error1;
 293
 294         cfg->allocated_sections = CFG_ALLOC_SECTION_BATCH;
 295
 296         for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
 297                 cfg->sections[i].entries = calloc(CFG_ALLOC_ENTRY_BATCH,
 298                                           sizeof(struct rte_cfgfile_entry));
 299
 300                 if (cfg->sections[i].entries == NULL)
 301                         goto error1;
 302
 303                 cfg->sections[i].num_entries = 0;
 304                 cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 305         }
 306
 307         if (flags & CFG_FLAG_GLOBAL_SECTION)
 308                 rte_cfgfile_add_section(cfg, "GLOBAL");
 309
 310         return cfg;
 311 error1:
 312         if (cfg->sections != NULL) {
 313                 for (i = 0; i < cfg->allocated_sections; i++) {
 314                         if (cfg->sections[i].entries != NULL) {
 315                                 free(cfg->sections[i].entries);
 316                                 cfg->sections[i].entries = NULL;
 317                         }
 318                 }
 319                 free(cfg->sections);
 320                 cfg->sections = NULL;
 321         }
 322         free(cfg);
 323         return NULL;
 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         strlcpy(cfg->sections[cfg->num_sections].name, sectionname,
 360                 sizeof(cfg->sections[0].name));
 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                         strlcpy(curr_section->entries[i].value, entryvalue,
 411                                 sizeof(curr_section->entries[i].value));
 412                         return 0;
 413                 }
 414
 415         CFG_LOG(ERR, "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                 strlcpy(sections[i], cfg->sections[i].name, CFG_NAME_LEN);
 487
 488         return i;
 489 }
 490
 491 int
 492 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
 493 {
 494         return _get_section(cfg, sectionname) != NULL;
 495 }
 496
 497 int
 498 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 499         const char *sectionname)
 500 {
 501         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
 502         if (s == NULL)
 503                 return -1;
 504         return s->num_entries;
 505 }
 506
 507 int
 508 rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
 509         char *sectionname, int index)
 510 {
 511         if (index < 0 || index >= cfg->num_sections)
 512                 return -1;
 513
 514         const struct rte_cfgfile_section *sect = &(cfg->sections[index]);
 515
 516         strlcpy(sectionname, sect->name, CFG_NAME_LEN);
 517         return sect->num_entries;
 518 }
 519 int
 520 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 521                 struct rte_cfgfile_entry *entries, int max_entries)
 522 {
 523         int i;
 524         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 525         if (sect == NULL)
 526                 return -1;
 527         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 528                 entries[i] = sect->entries[i];
 529         return i;
 530 }
 531
 532 int
 533 rte_cfgfile_section_entries_by_index(struct rte_cfgfile *cfg, int index,
 534                 char *sectionname,
 535                 struct rte_cfgfile_entry *entries, int max_entries)
 536 {
 537         int i;
 538         const struct rte_cfgfile_section *sect;
 539
 540         if (index < 0 || index >= cfg->num_sections)
 541                 return -1;
 542         sect = &cfg->sections[index];
 543         strlcpy(sectionname, sect->name, CFG_NAME_LEN);
 544         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 545                 entries[i] = sect->entries[i];
 546         return i;
 547 }
 548
 549 const char *
 550 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
 551                 const char *entryname)
 552 {
 553         int i;
 554         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 555         if (sect == NULL)
 556                 return NULL;
 557         for (i = 0; i < sect->num_entries; i++)
 558                 if (strncmp(sect->entries[i].name, entryname, CFG_NAME_LEN)
 559                                                                         == 0)
 560                         return sect->entries[i].value;
 561         return NULL;
 562 }
 563
 564 int
 565 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 566                 const char *entryname)
 567 {
 568         return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 569 }