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  *
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   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.
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  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 <rte_string_fns.h>
  39
  40 #include "rte_cfgfile.h"
  41
  42 struct rte_cfgfile_section {
  43         char name[CFG_NAME_LEN];
  44         int num_entries;
  45         struct rte_cfgfile_entry *entries[0];
  46 };
  47
  48 struct rte_cfgfile {
  49         int flags;
  50         int num_sections;
  51         struct rte_cfgfile_section *sections[0];
  52 };
  53
  54 /** when we resize a file structure, how many extra entries
  55  * for new sections do we add in */
  56 #define CFG_ALLOC_SECTION_BATCH 8
  57 /** when we resize a section structure, how many extra entries
  58  * for new entries do we add in */
  59 #define CFG_ALLOC_ENTRY_BATCH 16
  60
  61 static unsigned
  62 _strip(char *str, unsigned len)
  63 {
  64         int newlen = len;
  65         if (len == 0)
  66                 return 0;
  67
  68         if (isspace(str[len-1])) {
  69                 /* strip trailing whitespace */
  70                 while (newlen > 0 && isspace(str[newlen - 1]))
  71                         str[--newlen] = '\0';
  72         }
  73
  74         if (isspace(str[0])) {
  75                 /* strip leading whitespace */
  76                 int i, start = 1;
  77                 while (isspace(str[start]) && start < newlen)
  78                         start++
  79                         ; /* do nothing */
  80                 newlen -= start;
  81                 for (i = 0; i < newlen; i++)
  82                         str[i] = str[i+start];
  83                 str[i] = '\0';
  84         }
  85         return newlen;
  86 }
  87
  88 struct rte_cfgfile *
  89 rte_cfgfile_load(const char *filename, int flags)
  90 {
  91         int allocated_sections = CFG_ALLOC_SECTION_BATCH;
  92         int allocated_entries = 0;
  93         int curr_section = -1;
  94         int curr_entry = -1;
  95         char buffer[256] = {0};
  96         int lineno = 0;
  97         struct rte_cfgfile *cfg = NULL;
  98
  99         FILE *f = fopen(filename, "r");
 100         if (f == NULL)
 101                 return NULL;
 102
 103         cfg = malloc(sizeof(*cfg) + sizeof(cfg->sections[0]) *
 104                 allocated_sections);
 105         if (cfg == NULL)
 106                 goto error2;
 107
 108         memset(cfg->sections, 0, sizeof(cfg->sections[0]) * allocated_sections);
 109
 110         while (fgets(buffer, sizeof(buffer), f) != NULL) {
 111                 char *pos = NULL;
 112                 size_t len = strnlen(buffer, sizeof(buffer));
 113                 lineno++;
 114                 if ((len >= sizeof(buffer) - 1) && (buffer[len-1] != '\n')) {
 115                         printf("Error line %d - no \\n found on string. "
 116                                         "Check if line too long\n", lineno);
 117                         goto error1;
 118                 }
 119                 pos = memchr(buffer, ';', sizeof(buffer));
 120                 if (pos != NULL) {
 121                         *pos = '\0';
 122                         len = pos -  buffer;
 123                 }
 124
 125                 len = _strip(buffer, len);
 126                 if (buffer[0] != '[' && memchr(buffer, '=', len) == NULL)
 127                         continue;
 128
 129                 if (buffer[0] == '[') {
 130                         /* section heading line */
 131                         char *end = memchr(buffer, ']', len);
 132                         if (end == NULL) {
 133                                 printf("Error line %d - no terminating '['"
 134                                         "character found\n", lineno);
 135                                 goto error1;
 136                         }
 137                         *end = '\0';
 138                         _strip(&buffer[1], end - &buffer[1]);
 139
 140                         /* close off old section and add start new one */
 141                         if (curr_section >= 0)
 142                                 cfg->sections[curr_section]->num_entries =
 143                                         curr_entry + 1;
 144                         curr_section++;
 145
 146                         /* resize overall struct if we don't have room for more
 147                         sections */
 148                         if (curr_section == allocated_sections) {
 149                                 allocated_sections += CFG_ALLOC_SECTION_BATCH;
 150                                 struct rte_cfgfile *n_cfg = realloc(cfg,
 151                                         sizeof(*cfg) + sizeof(cfg->sections[0])
 152                                         * allocated_sections);
 153                                 if (n_cfg == NULL) {
 154                                         curr_section--;
 155                                         printf("Error - no more memory\n");
 156                                         goto error1;
 157                                 }
 158                                 cfg = n_cfg;
 159                         }
 160
 161                         /* allocate space for new section */
 162                         allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 163                         curr_entry = -1;
 164                         cfg->sections[curr_section] = malloc(
 165                                 sizeof(*cfg->sections[0]) +
 166                                 sizeof(cfg->sections[0]->entries[0]) *
 167                                 allocated_entries);
 168                         if (cfg->sections[curr_section] == NULL) {
 169                                 printf("Error - no more memory\n");
 170                                 goto error1;
 171                         }
 172
 173                         snprintf(cfg->sections[curr_section]->name,
 174                                         sizeof(cfg->sections[0]->name),
 175                                         "%s", &buffer[1]);
 176                 } else {
 177                         /* value line */
 178                         if (curr_section < 0) {
 179                                 printf("Error line %d - value outside of"
 180                                         "section\n", lineno);
 181                                 goto error1;
 182                         }
 183
 184                         struct rte_cfgfile_section *sect =
 185                                 cfg->sections[curr_section];
 186                         char *split[2];
 187                         if (rte_strsplit(buffer, sizeof(buffer), split, 2, '=')
 188                                 != 2) {
 189                                 printf("Error at line %d - cannot split "
 190                                         "string\n", lineno);
 191                                 goto error1;
 192                         }
 193
 194                         curr_entry++;
 195                         if (curr_entry == allocated_entries) {
 196                                 allocated_entries += CFG_ALLOC_ENTRY_BATCH;
 197                                 struct rte_cfgfile_section *n_sect = realloc(
 198                                         sect, sizeof(*sect) +
 199                                         sizeof(sect->entries[0]) *
 200                                         allocated_entries);
 201                                 if (n_sect == NULL) {
 202                                         curr_entry--;
 203                                         printf("Error - no more memory\n");
 204                                         goto error1;
 205                                 }
 206                                 sect = cfg->sections[curr_section] = n_sect;
 207                         }
 208
 209                         sect->entries[curr_entry] = malloc(
 210                                 sizeof(*sect->entries[0]));
 211                         if (sect->entries[curr_entry] == NULL) {
 212                                 printf("Error - no more memory\n");
 213                                 goto error1;
 214                         }
 215
 216                         struct rte_cfgfile_entry *entry = sect->entries[
 217                                 curr_entry];
 218                         snprintf(entry->name, sizeof(entry->name), "%s",
 219                                 split[0]);
 220                         snprintf(entry->value, sizeof(entry->value), "%s",
 221                                 split[1]);
 222                         _strip(entry->name, strnlen(entry->name,
 223                                 sizeof(entry->name)));
 224                         _strip(entry->value, strnlen(entry->value,
 225                                 sizeof(entry->value)));
 226                 }
 227         }
 228         fclose(f);
 229         cfg->flags = flags;
 230         cfg->num_sections = curr_section + 1;
 231         /* curr_section will still be -1 if we have an empty file */
 232         if (curr_section >= 0)
 233                 cfg->sections[curr_section]->num_entries = curr_entry + 1;
 234         return cfg;
 235
 236 error1:
 237         cfg->num_sections = curr_section + 1;
 238         if (curr_section >= 0)
 239                 cfg->sections[curr_section]->num_entries = curr_entry + 1;
 240         rte_cfgfile_close(cfg);
 241 error2:
 242         fclose(f);
 243         return NULL;
 244 }
 245
 246
 247 int rte_cfgfile_close(struct rte_cfgfile *cfg)
 248 {
 249         int i, j;
 250
 251         if (cfg == NULL)
 252                 return -1;
 253
 254         for (i = 0; i < cfg->num_sections; i++) {
 255                 if (cfg->sections[i] != NULL) {
 256                         if (cfg->sections[i]->num_entries) {
 257                                 for (j = 0; j < cfg->sections[i]->num_entries;
 258                                         j++) {
 259                                         if (cfg->sections[i]->entries[j] !=
 260                                                 NULL)
 261                                                 free(cfg->sections[i]->
 262                                                         entries[j]);
 263                                 }
 264                         }
 265                         free(cfg->sections[i]);
 266                 }
 267         }
 268         free(cfg);
 269
 270         return 0;
 271 }
 272
 273 int
 274 rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sectionname,
 275 size_t length)
 276 {
 277         int i;
 278         int num_sections = 0;
 279         for (i = 0; i < cfg->num_sections; i++) {
 280                 if (strncmp(cfg->sections[i]->name, sectionname, length) == 0)
 281                         num_sections++;
 282         }
 283         return num_sections;
 284 }
 285
 286 int
 287 rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
 288         int max_sections)
 289 {
 290         int i;
 291
 292         for (i = 0; i < cfg->num_sections && i < max_sections; i++)
 293                 snprintf(sections[i], CFG_NAME_LEN, "%s",
 294                 cfg->sections[i]->name);
 295
 296         return i;
 297 }
 298
 299 static const struct rte_cfgfile_section *
 300 _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 301 {
 302         int i;
 303         for (i = 0; i < cfg->num_sections; i++) {
 304                 if (strncmp(cfg->sections[i]->name, sectionname,
 305                                 sizeof(cfg->sections[0]->name)) == 0)
 306                         return cfg->sections[i];
 307         }
 308         return NULL;
 309 }
 310
 311 int
 312 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
 313 {
 314         return _get_section(cfg, sectionname) != NULL;
 315 }
 316
 317 int
 318 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 319         const char *sectionname)
 320 {
 321         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
 322         if (s == NULL)
 323                 return -1;
 324         return s->num_entries;
 325 }
 326
 327
 328 int
 329 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 330                 struct rte_cfgfile_entry *entries, int max_entries)
 331 {
 332         int i;
 333         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 334         if (sect == NULL)
 335                 return -1;
 336         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 337                 entries[i] = *sect->entries[i];
 338         return i;
 339 }
 340
 341 int
 342 rte_cfgfile_section_entries_by_index(struct rte_cfgfile *cfg, int index,
 343                 char *sectionname,
 344                 struct rte_cfgfile_entry *entries, int max_entries)
 345 {
 346         int i;
 347         const struct rte_cfgfile_section *sect;
 348
 349         if (index < 0 || index >= cfg->num_sections)
 350                 return -1;
 351
 352         sect = cfg->sections[index];
 353         snprintf(sectionname, CFG_NAME_LEN, "%s", sect->name);
 354         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 355                 entries[i] = *sect->entries[i];
 356         return i;
 357 }
 358
 359 const char *
 360 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
 361                 const char *entryname)
 362 {
 363         int i;
 364         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 365         if (sect == NULL)
 366                 return NULL;
 367         for (i = 0; i < sect->num_entries; i++)
 368                 if (strncmp(sect->entries[i]->name, entryname, CFG_NAME_LEN)
 369                         == 0)
 370                         return sect->entries[i]->value;
 371         return NULL;
 372 }
 373
 374 int
 375 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 376                 const char *entryname)
 377 {
 378         return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 379 }