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 <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                                         printf("Error - no more memory\n");
 155                                         goto error1;
 156                                 }
 157                                 cfg = n_cfg;
 158                         }
 159
 160                         /* allocate space for new section */
 161                         allocated_entries = CFG_ALLOC_ENTRY_BATCH;
 162                         curr_entry = -1;
 163                         cfg->sections[curr_section] = malloc(
 164                                 sizeof(*cfg->sections[0]) +
 165                                 sizeof(cfg->sections[0]->entries[0]) *
 166                                 allocated_entries);
 167                         if (cfg->sections[curr_section] == NULL) {
 168                                 printf("Error - no more memory\n");
 169                                 goto error1;
 170                         }
 171
 172                         snprintf(cfg->sections[curr_section]->name,
 173                                         sizeof(cfg->sections[0]->name),
 174                                         "%s", &buffer[1]);
 175                 } else {
 176                         /* value line */
 177                         if (curr_section < 0) {
 178                                 printf("Error line %d - value outside of"
 179                                         "section\n", lineno);
 180                                 goto error1;
 181                         }
 182
 183                         struct rte_cfgfile_section *sect =
 184                                 cfg->sections[curr_section];
 185                         char *split[2];
 186                         if (rte_strsplit(buffer, sizeof(buffer), split, 2, '=')
 187                                 != 2) {
 188                                 printf("Error at line %d - cannot split "
 189                                         "string\n", lineno);
 190                                 goto error1;
 191                         }
 192
 193                         curr_entry++;
 194                         if (curr_entry == allocated_entries) {
 195                                 allocated_entries += CFG_ALLOC_ENTRY_BATCH;
 196                                 struct rte_cfgfile_section *n_sect = realloc(
 197                                         sect, sizeof(*sect) +
 198                                         sizeof(sect->entries[0]) *
 199                                         allocated_entries);
 200                                 if (n_sect == NULL) {
 201                                         printf("Error - no more memory\n");
 202                                         goto error1;
 203                                 }
 204                                 sect = cfg->sections[curr_section] = n_sect;
 205                         }
 206
 207                         sect->entries[curr_entry] = malloc(
 208                                 sizeof(*sect->entries[0]));
 209                         if (sect->entries[curr_entry] == NULL) {
 210                                 printf("Error - no more memory\n");
 211                                 goto error1;
 212                         }
 213
 214                         struct rte_cfgfile_entry *entry = sect->entries[
 215                                 curr_entry];
 216                         snprintf(entry->name, sizeof(entry->name), "%s",
 217                                 split[0]);
 218                         snprintf(entry->value, sizeof(entry->value), "%s",
 219                                 split[1]);
 220                         _strip(entry->name, strnlen(entry->name,
 221                                 sizeof(entry->name)));
 222                         _strip(entry->value, strnlen(entry->value,
 223                                 sizeof(entry->value)));
 224                 }
 225         }
 226         fclose(f);
 227         cfg->flags = flags;
 228         cfg->num_sections = curr_section + 1;
 229         /* curr_section will still be -1 if we have an empty file */
 230         if (curr_section >= 0)
 231                 cfg->sections[curr_section]->num_entries = curr_entry + 1;
 232         return cfg;
 233
 234 error1:
 235         rte_cfgfile_close(cfg);
 236 error2:
 237         fclose(f);
 238         return NULL;
 239 }
 240
 241
 242 int rte_cfgfile_close(struct rte_cfgfile *cfg)
 243 {
 244         int i, j;
 245
 246         if (cfg == NULL)
 247                 return -1;
 248
 249         for (i = 0; i < cfg->num_sections; i++) {
 250                 if (cfg->sections[i] != NULL) {
 251                         if (cfg->sections[i]->num_entries) {
 252                                 for (j = 0; j < cfg->sections[i]->num_entries;
 253                                         j++) {
 254                                         if (cfg->sections[i]->entries[j] !=
 255                                                 NULL)
 256                                                 free(cfg->sections[i]->
 257                                                         entries[j]);
 258                                 }
 259                         }
 260                         free(cfg->sections[i]);
 261                 }
 262         }
 263         free(cfg);
 264
 265         return 0;
 266 }
 267
 268 int
 269 rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sectionname,
 270 size_t length)
 271 {
 272         int i;
 273         int num_sections = 0;
 274         for (i = 0; i < cfg->num_sections; i++) {
 275                 if (strncmp(cfg->sections[i]->name, sectionname, length) == 0)
 276                         num_sections++;
 277         }
 278         return num_sections;
 279 }
 280
 281 int
 282 rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
 283         int max_sections)
 284 {
 285         int i;
 286
 287         for (i = 0; i < cfg->num_sections && i < max_sections; i++)
 288                 snprintf(sections[i], CFG_NAME_LEN, "%s",
 289                 cfg->sections[i]->name);
 290
 291         return i;
 292 }
 293
 294 static const struct rte_cfgfile_section *
 295 _get_section(struct rte_cfgfile *cfg, const char *sectionname)
 296 {
 297         int i;
 298         for (i = 0; i < cfg->num_sections; i++) {
 299                 if (strncmp(cfg->sections[i]->name, sectionname,
 300                                 sizeof(cfg->sections[0]->name)) == 0)
 301                         return cfg->sections[i];
 302         }
 303         return NULL;
 304 }
 305
 306 int
 307 rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname)
 308 {
 309         return _get_section(cfg, sectionname) != NULL;
 310 }
 311
 312 int
 313 rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 314         const char *sectionname)
 315 {
 316         const struct rte_cfgfile_section *s = _get_section(cfg, sectionname);
 317         if (s == NULL)
 318                 return -1;
 319         return s->num_entries;
 320 }
 321
 322
 323 int
 324 rte_cfgfile_section_entries(struct rte_cfgfile *cfg, const char *sectionname,
 325                 struct rte_cfgfile_entry *entries, int max_entries)
 326 {
 327         int i;
 328         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 329         if (sect == NULL)
 330                 return -1;
 331         for (i = 0; i < max_entries && i < sect->num_entries; i++)
 332                 entries[i] = *sect->entries[i];
 333         return i;
 334 }
 335
 336 const char *
 337 rte_cfgfile_get_entry(struct rte_cfgfile *cfg, const char *sectionname,
 338                 const char *entryname)
 339 {
 340         int i;
 341         const struct rte_cfgfile_section *sect = _get_section(cfg, sectionname);
 342         if (sect == NULL)
 343                 return NULL;
 344         for (i = 0; i < sect->num_entries; i++)
 345                 if (strncmp(sect->entries[i]->name, entryname, CFG_NAME_LEN)
 346                         == 0)
 347                         return sect->entries[i]->value;
 348         return NULL;
 349 }
 350
 351 int
 352 rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 353                 const char *entryname)
 354 {
 355         return rte_cfgfile_get_entry(cfg, sectionname, entryname) != NULL;
 356 }