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 static int cfgfile_logtype;
  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 && (*(pos-1) != '\\')) {
 195                         *pos = '\0';
 196                         len = pos -  buffer;
 197                 }
 198
 199                 len = _strip(buffer, len);
 200                 /* skip lines without useful content */
 201                 if (buffer[0] != '[' && memchr(buffer, '=', len) == NULL)
 202                         continue;
 203
 204                 if (buffer[0] == '[') {
 205                         /* section heading line */
 206                         char *end = memchr(buffer, ']', len);
 207                         if (end == NULL) {
 208                                 CFG_LOG(ERR,
 209                                         "line %d - no terminating ']' character found\n",
 210                                         lineno);
 211                                 goto error1;
 212                         }
 213                         *end = '\0';
 214                         _strip(&buffer[1], end - &buffer[1]);
 215
 216                         rte_cfgfile_add_section(cfg, &buffer[1]);
 217                 } else {
 218                         /* key and value line */
 219                         char *split[2] = {NULL};
 220
 221                         split[0] = buffer;
 222                         split[1] = memchr(buffer, '=', len);
 223                         if (split[1] == NULL) {
 224                                 CFG_LOG(ERR,
 225                                         "line %d - no '=' character found\n",
 226                                         lineno);
 227                                 goto error1;
 228                         }
 229                         *split[1] = '\0';
 230                         split[1]++;
 231
 232                         _strip(split[0], strlen(split[0]));
 233                         _strip(split[1], strlen(split[1]));
 234                         char *end = memchr(split[1], '\\', strlen(split[1]));
 235
 236                         size_t split_len = strlen(split[1]) + 1;
 237                         while (end != NULL) {
 238                                 if (*(end+1) == params->comment_character) {
 239                                         *end = '\0';
 240                                         strlcat(split[1], end+1, split_len);
 241                                 } else
 242                                         end++;
 243                                 end = memchr(end, '\\', strlen(end));
 244                         }
 245
 246                         if (!(flags & CFG_FLAG_EMPTY_VALUES) &&
 247                                         (*split[1] == '\0')) {
 248                                 CFG_LOG(ERR,
 249                                         "line %d - cannot use empty values\n",
 250                                         lineno);
 251                                 goto error1;
 252                         }
 253
 254                         if (cfg->num_sections == 0)
 255                                 goto error1;
 256
 257                         _add_entry(&cfg->sections[cfg->num_sections - 1],
 258                                         split[0], split[1]);
 259                 }
 260         }
 261         fclose(f);
 262         return cfg;
 263 error1:
 264         rte_cfgfile_close(cfg);
 265         fclose(f);
 266         return NULL;
 267 }
 268
 269 struct rte_cfgfile *
 270 rte_cfgfile_create(int flags)
 271 {
 272         int i;
 273         struct rte_cfgfile *cfg;
 274
 275         cfg = malloc(sizeof(*cfg));
 276
 277         if (cfg == NULL)
 278                 return NULL;
 279
 280         cfg->flags = flags;
 281         cfg->num_sections = 0;
 282
 283         /* allocate first batch of sections and entries */
 284         cfg->sections = malloc(sizeof(struct rte_cfgfile_section) *
 285                         CFG_ALLOC_SECTION_BATCH);
 286
 287         if (cfg->sections == NULL)
 288                 goto error1;
 289
 290         cfg->allocated_sections = CFG_ALLOC_SECTION_BATCH;
 291
 292         for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
 293                 cfg->sections[i].entries = malloc(sizeof(
 294                         struct rte_cfgfile_entry) * CFG_ALLOC_ENTRY_BATCH);
 295
 296                 if (cfg->sections[i].entries == NULL)
 297                         goto error1;
 298
 299                 cfg->sections[i].num_entries = 0;
 300                 cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 301         }
 302
 303         if (flags & CFG_FLAG_GLOBAL_SECTION)
 304                 rte_cfgfile_add_section(cfg, "GLOBAL");
 305
 306         return cfg;
 307 error1:
 308         if (cfg->sections != NULL) {
 309                 for (i = 0; i < cfg->allocated_sections; i++) {
 310                         if (cfg->sections[i].entries != NULL) {
 311                                 free(cfg->sections[i].entries);
 312                                 cfg->sections[i].entries = NULL;
 313                         }
 314                 }
 315                 free(cfg->sections);
 316                 cfg->sections = NULL;
 317         }
 318         free(cfg);
 319         return NULL;
 320 }
 321
 322 int
 323 rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname)
 324 {
 325         int i;
 326
 327         if (cfg == NULL)
 328                 return -EINVAL;
 329
 330         if (sectionname == NULL)
 331                 return -EINVAL;
 332
 333         /* resize overall struct if we don't have room for more sections */
 334         if (cfg->num_sections == cfg->allocated_sections) {
 335
 336                 struct rte_cfgfile_section *n_sections =
 337                                 realloc(cfg->sections,
 338                                 sizeof(struct rte_cfgfile_section) *
 339                                 ((cfg->allocated_sections) +
 340                                 CFG_ALLOC_SECTION_BATCH));
 341
 342                 if (n_sections == NULL)
 343                         return -ENOMEM;
 344
 345                 for (i = 0; i < CFG_ALLOC_SECTION_BATCH; i++) {
 346                         n_sections[i + cfg->allocated_sections].num_entries = 0;
 347                         n_sections[i +
 348                                  cfg->allocated_sections].allocated_entries = 0;
 349                         n_sections[i + cfg->allocated_sections].entries = NULL;
 350                 }
 351                 cfg->sections = n_sections;
 352                 cfg->allocated_sections += CFG_ALLOC_SECTION_BATCH;
 353         }
 354
 355         strlcpy(cfg->sections[cfg->num_sections].name, sectionname,
 356                 sizeof(cfg->sections[0].name));
 357         cfg->sections[cfg->num_sections].num_entries = 0;
 358         cfg->num_sections++;
 359
 360         return 0;
 361 }
 362
 363 int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 364                 const char *sectionname, const char *entryname,
 365                 const char *entryvalue)
 366 {
 367         int ret;
 368
 369         if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL)
 370                         || (entryvalue == NULL))
 371                 return -EINVAL;
 372
 373         if (rte_cfgfile_has_entry(cfg, sectionname, entryname) != 0)
 374                 return -EEXIST;
 375
 376         /* search for section pointer by sectionname */
 377         struct rte_cfgfile_section *curr_section = _get_section(cfg,
 378                                                                 sectionname);
 379         if (curr_section == NULL)
 380                 return -EINVAL;
 381
 382         ret = _add_entry(curr_section, entryname, entryvalue);
 383
 384         return ret;
 385 }
 386
 387 int rte_cfgfile_set_entry(struct rte_cfgfile *cfg, const char *sectionname,
 388                 const char *entryname, const char *entryvalue)
 389 {
 390         int i;
 391
 392         if ((cfg == NULL) || (sectionname == NULL) || (entryname == NULL))
 393                 return -EINVAL;
 394
 395         /* search for section pointer by sectionname */
 396         struct rte_cfgfile_section *curr_section = _get_section(cfg,
 397                                                                 sectionname);
 398         if (curr_section == NULL)
 399                 return -EINVAL;
 400
 401         if (entryvalue == NULL)
 402                 entryvalue = "";
 403
 404         for (i = 0; i < curr_section->num_entries; i++)
 405                 if (!strcmp(curr_section->entries[i].name, entryname)) {
 406                         strlcpy(curr_section->entries[i].value, entryvalue,
 407                                 sizeof(curr_section->entries[i].value));
 408                         return 0;
 409                 }
 410
 411         CFG_LOG(ERR, "entry name doesn't exist\n");
 412         return -EINVAL;
 413 }
 414
 415 int rte_cfgfile_save(struct rte_cfgfile *cfg, const char *filename)
 416 {
 417         int i, j;
 418
 419         if ((cfg == NULL) || (filename == NULL))
 420                 return -EINVAL;
 421
 422         FILE *f = fopen(filename, "w");
 423
 424         if (f == NULL)
 425                 return -EINVAL;
 426
 427         for (i = 0; i < cfg->num_sections; i++) {
 428                 fprintf(f, "[%s]\n", cfg->sections[i].name);
 429
 430                 for (j = 0; j < cfg->sections[i].num_entries; j++) {
 431                         fprintf(f, "%s=%s\n",
 432                                         cfg->sections[i].entries[j].name,
 433                                         cfg->sections[i].entries[j].value);
 434                 }
 435         }
 436         return fclose(f);
 437 }
 438
 439 int rte_cfgfile_close(struct rte_cfgfile *cfg)
 440 {
 441         int i;
 442
 443         if (cfg == NULL)
 444                 return -1;
 445
 446         if (cfg->sections != NULL) {
 447                 for (i = 0; i < cfg->allocated_sections; i++) {
 448                         if (cfg->sections[i].entries != NULL) {
 449                                 free(cfg->sections[i].entries);
 450                                 cfg->sections[i].entries = NULL;
 451                         }
 452                 }
 453                 free(cfg->sections);
 454                 cfg->sections = NULL;
 455         }
 456         free(cfg);
 457         cfg = NULL;
 458
 459         return 0;
 460 }
 461
 462 int
 463 rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sectionname,
 464 size_t length)
 465 {
 466         int i;
 467         int num_sections = 0;
 468         for (i = 0; i < cfg->num_sections; i++) {
 469                 if (strncmp(cfg->sections[i].name, sectionname, length) == 0)
 470                         num_sections++;
 471         }
 472         return num_sections;
 473 }
 474
 475 int
 476 rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
 477         int max_sections)
 478 {
 479         int i;
 480
 481         for (i = 0; i < cfg->num_sections && i < max_sections; i++)
 482                 strlcpy(sections[i], cfg->sections[i].name, CFG_NAME_LEN);
 483
 484         return i;
 485 }
 486
 487 int
 488 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
 489 {
 490         return _get_section(cfg, sectionname) != NULL;
 491 }
 492
 493 int
 494 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 495         const char *sectionname)
 496 {
 497         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
 498         if (s == NULL)
 499                 return -1;
 500         return s->num_entries;
 501 }
 502
 503 int
 504 rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
 505         char *sectionname, int index)
 506 {
 507         if (index < 0 || index >= cfg->num_sections)
 508                 return -1;
 509
 510         const struct rte_cfgfile_section *sect = &(cfg->sections[index]);
 511
 512         strlcpy(sectionname, sect->name, CFG_NAME_LEN);
 513         return sect->num_entries;
 514 }
 515 int
 516 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 517                 struct rte_cfgfile_entry *entries, int max_entries)
 518 {
 519         int i;
 520         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 521         if (sect == NULL)
 522                 return -1;
 523         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 524                 entries[i] = sect->entries[i];
 525         return i;
 526 }
 527
 528 int
 529 rte_cfgfile_section_entries_by_index(struct rte_cfgfile *cfg, int index,
 530                 char *sectionname,
 531                 struct rte_cfgfile_entry *entries, int max_entries)
 532 {
 533         int i;
 534         const struct rte_cfgfile_section *sect;
 535
 536         if (index < 0 || index >= cfg->num_sections)
 537                 return -1;
 538         sect = &cfg->sections[index];
 539         strlcpy(sectionname, sect->name, CFG_NAME_LEN);
 540         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 541                 entries[i] = sect->entries[i];
 542         return i;
 543 }
 544
 545 const char *
 546 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
 547                 const char *entryname)
 548 {
 549         int i;
 550         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 551         if (sect == NULL)
 552                 return NULL;
 553         for (i = 0; i < sect->num_entries; i++)
 554                 if (strncmp(sect->entries[i].name, entryname, CFG_NAME_LEN)
 555                                                                         == 0)
 556                         return sect->entries[i].value;
 557         return NULL;
 558 }
 559
 560 int
 561 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 562                 const char *entryname)
 563 {
 564         return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 565 }
 566
 567 RTE_INIT(cfgfile_init)
 568 {
 569         cfgfile_logtype = rte_log_register("lib.cfgfile");
 570         if (cfgfile_logtype >= 0)
 571                 rte_log_set_level(cfgfile_logtype, RTE_LOG_INFO);
 572 }