ceph/src/spdk/dpdk/lib/librte_cfgfile/rte_cfgfile.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef __INCLUDE_RTE_CFGFILE_H__
   6 #define __INCLUDE_RTE_CFGFILE_H__
   7
   8 #include <stddef.h>
   9
  10 #ifdef __cplusplus
  11 extern "C" {
  12 #endif
  13
  14 /**
  15 * @file
  16 * RTE Configuration File
  17 *
  18 * This library allows reading application defined parameters from standard
  19 * format configuration file.
  20 *
  21 ***/
  22
  23 #ifndef CFG_NAME_LEN
  24 #define CFG_NAME_LEN 64
  25 #endif
  26
  27 #ifndef CFG_VALUE_LEN
  28 #define CFG_VALUE_LEN 256
  29 #endif
  30
  31 /** Configuration file */
  32 struct rte_cfgfile;
  33
  34 /** Configuration file entry */
  35 struct rte_cfgfile_entry {
  36         char name[CFG_NAME_LEN]; /**< Name */
  37         char value[CFG_VALUE_LEN]; /**< Value */
  38 };
  39
  40 /** Configuration file operation optional arguments */
  41 struct rte_cfgfile_parameters {
  42         /** Config file comment character; one of '!', '#', '%', ';', '@' */
  43         char comment_character;
  44 };
  45
  46 /**@{ cfgfile load operation flags */
  47 enum {
  48         /**
  49          * Indicates that the file supports key value entries before the first
  50          * defined section.  These entries can be accessed in the "GLOBAL"
  51          * section.
  52          */
  53         CFG_FLAG_GLOBAL_SECTION = 1,
  54
  55         /**
  56          * Indicates that file supports key value entries where the value can
  57          * be zero length (e.g., "key=").
  58          */
  59         CFG_FLAG_EMPTY_VALUES = 2,
  60 };
  61 /**@} */
  62
  63 /** Defines the default comment character used for parsing config files. */
  64 #define CFG_DEFAULT_COMMENT_CHARACTER ';'
  65
  66 /**
  67 * Open config file
  68 *
  69 * @param filename
  70 *   Config file name
  71 * @param flags
  72 *   Config file flags
  73 * @return
  74 *   Handle to configuration file on success, NULL otherwise
  75 */
  76 struct rte_cfgfile *rte_cfgfile_load(const char *filename, int flags);
  77
  78 /**
  79  * Open config file with specified optional parameters.
  80  *
  81  * @param filename
  82  *   Config file name
  83  * @param flags
  84  *   Config file flags
  85  * @param params
  86  *   Additional configuration attributes.  Must be configured with desired
  87  *   values prior to invoking this API.
  88  * @return
  89  *   Handle to configuration file on success, NULL otherwise
  90  */
  91 struct rte_cfgfile *rte_cfgfile_load_with_params(const char *filename,
  92         int flags, const struct rte_cfgfile_parameters *params);
  93
  94 /**
  95  * Create new cfgfile instance with empty sections and entries
  96  *
  97  * @param flags
  98  *   - CFG_FLAG_GLOBAL_SECTION
  99  *     Indicates that the file supports key value entries before the first
 100  *     defined section.  These entries can be accessed in the "GLOBAL"
 101  *     section.
 102  *   - CFG_FLAG_EMPTY_VALUES
 103  *     Indicates that file supports key value entries where the value can
 104  *     be zero length (e.g., "key=").
 105  * @return
 106  *   Handle to cfgfile instance on success, NULL otherwise
 107  */
 108 struct rte_cfgfile *rte_cfgfile_create(int flags);
 109
 110 /**
 111  * Add section in cfgfile instance.
 112  *
 113  * @param cfg
 114  *   Pointer to the cfgfile structure.
 115  * @param sectionname
 116  *   Section name which will be add to cfgfile.
 117  * @return
 118  *   0 on success, -ENOMEM if can't add section
 119  */
 120 int
 121 rte_cfgfile_add_section(struct rte_cfgfile *cfg, const char *sectionname);
 122
 123 /**
 124  * Add entry to specified section in cfgfile instance.
 125  *
 126  * @param cfg
 127  *   Pointer to the cfgfile structure.
 128  * @param sectionname
 129  *   Given section name to add an entry.
 130  * @param entryname
 131  *   Entry name to add.
 132  * @param entryvalue
 133  *   Entry value to add.
 134  * @return
 135  *   0 on success, -EEXIST if entry already exist, -EINVAL if bad argument
 136  */
 137 int rte_cfgfile_add_entry(struct rte_cfgfile *cfg,
 138                 const char *sectionname, const char *entryname,
 139                 const char *entryvalue);
 140
 141 /**
 142  * Update value of specified entry name in given section in config file
 143  *
 144  * @param cfg
 145  *   Config file
 146  * @param sectionname
 147  *   Section name
 148  * @param entryname
 149  *   Entry name to look for the value change
 150  * @param entryvalue
 151  *   New entry value. Can be also an empty string if CFG_FLAG_EMPTY_VALUES = 1
 152  * @return
 153  *   0 on success, -EINVAL if bad argument
 154  */
 155 int rte_cfgfile_set_entry(struct rte_cfgfile *cfg, const char *sectionname,
 156                 const char *entryname, const char *entryvalue);
 157
 158 /**
 159  * Save object cfgfile to file on disc
 160  *
 161  * @param cfg
 162  *   Config file structure
 163  * @param filename
 164  *   File name to save data
 165  * @return
 166  *   0 on success, errno otherwise
 167  */
 168 int rte_cfgfile_save(struct rte_cfgfile *cfg, const char *filename);
 169
 170 /**
 171 * Get number of sections in config file
 172 *
 173 * @param cfg
 174 *   Config file
 175 * @param sec_name
 176 *   Section name
 177 * @param length
 178 *   Maximum section name length
 179 * @return
 180 *   Number of sections
 181 */
 182 int rte_cfgfile_num_sections(struct rte_cfgfile *cfg, const char *sec_name,
 183         size_t length);
 184
 185 /**
 186 * Get name of all config file sections.
 187 *
 188 * Fills in the array sections with the name of all the sections in the file
 189 * (up to the number of max_sections sections).
 190 *
 191 * @param cfg
 192 *   Config file
 193 * @param sections
 194 *   Array containing section names after successful invocation. Each element
 195 *   of this array should be preallocated by the user with at least
 196 *   CFG_NAME_LEN characters.
 197 * @param max_sections
 198 *   Maximum number of section names to be stored in sections array
 199 * @return
 200 *   Number of populated sections names
 201 */
 202 int rte_cfgfile_sections(struct rte_cfgfile *cfg, char *sections[],
 203         int max_sections);
 204
 205 /**
 206 * Check if given section exists in config file
 207 *
 208 * @param cfg
 209 *   Config file
 210 * @param sectionname
 211 *   Section name
 212 * @return
 213 *   TRUE (value different than 0) if section exists, FALSE (value 0) otherwise
 214 */
 215 int rte_cfgfile_has_section(struct rte_cfgfile *cfg, const char *sectionname);
 216
 217 /**
 218 * Get number of entries in given config file section
 219 *
 220 * If multiple sections have the given name this function operates on the
 221 * first one.
 222 *
 223 * @param cfg
 224 *   Config file
 225 * @param sectionname
 226 *   Section name
 227 * @return
 228 *   Number of entries in section on success, -1 otherwise
 229 */
 230 int rte_cfgfile_section_num_entries(struct rte_cfgfile *cfg,
 231         const char *sectionname);
 232
 233 /**
 234 * Get number of entries in given config file section
 235 *
 236 * The index of a section is the same as the index of its name in the
 237 * result of rte_cfgfile_sections. This API can be used when there are
 238 * multiple sections with the same name.
 239 *
 240 * @param cfg
 241 *   Config file
 242 * @param sectionname
 243 *   Section name
 244 * @param index
 245 *   Section index
 246 * @return
 247 *   Number of entries in section on success, -1 otherwise
 248 */
 249 int rte_cfgfile_section_num_entries_by_index(struct rte_cfgfile *cfg,
 250         char *sectionname,
 251         int index);
 252
 253 /**
 254 * Get section entries as key-value pairs
 255 *
 256 * If multiple sections have the given name this function operates on the
 257 * first one.
 258 *
 259 * @param cfg
 260 *   Config file
 261 * @param sectionname
 262 *   Section name
 263 * @param entries
 264 *   Pre-allocated array of at least max_entries entries where the section
 265 *   entries are stored as key-value pair after successful invocation
 266 * @param max_entries
 267 *   Maximum number of section entries to be stored in entries array
 268 * @return
 269 *   Number of entries populated on success, -1 otherwise
 270 */
 271 int rte_cfgfile_section_entries(struct rte_cfgfile *cfg,
 272         const char *sectionname,
 273         struct rte_cfgfile_entry *entries,
 274         int max_entries);
 275
 276 /**
 277 * Get section entries as key-value pairs
 278 *
 279 * The index of a section is the same as the index of its name in the
 280 * result of rte_cfgfile_sections. This API can be used when there are
 281 * multiple sections with the same name.
 282 *
 283 * @param cfg
 284 *   Config file
 285 * @param index
 286 *   Section index
 287 * @param sectionname
 288 *   Pre-allocated string of at least CFG_NAME_LEN characters where the
 289 *   section name is stored after successful invocation.
 290 * @param entries
 291 *   Pre-allocated array of at least max_entries entries where the section
 292 *   entries are stored as key-value pair after successful invocation
 293 * @param max_entries
 294 *   Maximum number of section entries to be stored in entries array
 295 * @return
 296 *   Number of entries populated on success, -1 otherwise
 297 */
 298 int rte_cfgfile_section_entries_by_index(struct rte_cfgfile *cfg,
 299         int index,
 300         char *sectionname,
 301         struct rte_cfgfile_entry *entries,
 302         int max_entries);
 303
 304 /**
 305 * Get value of the named entry in named config file section
 306 *
 307 * If multiple sections have the given name this function operates on the
 308 * first one.
 309 *
 310 * @param cfg
 311 *   Config file
 312 * @param sectionname
 313 *   Section name
 314 * @param entryname
 315 *   Entry name
 316 * @return
 317 *   Entry value on success, NULL otherwise
 318 */
 319 const char *rte_cfgfile_get_entry(struct rte_cfgfile *cfg,
 320         const char *sectionname,
 321         const char *entryname);
 322
 323 /**
 324 * Check if given entry exists in named config file section
 325 *
 326 * If multiple sections have the given name this function operates on the
 327 * first one.
 328 *
 329 * @param cfg
 330 *   Config file
 331 * @param sectionname
 332 *   Section name
 333 * @param entryname
 334 *   Entry name
 335 * @return
 336 *   TRUE (value different than 0) if entry exists, FALSE (value 0) otherwise
 337 */
 338 int rte_cfgfile_has_entry(struct rte_cfgfile *cfg, const char *sectionname,
 339         const char *entryname);
 340
 341 /**
 342 * Close config file
 343 *
 344 * @param cfg
 345 *   Config file
 346 * @return
 347 *   0 on success, -1 otherwise
 348 */
 349 int rte_cfgfile_close(struct rte_cfgfile *cfg);
 350
 351 #ifdef __cplusplus
 352 }
 353 #endif
 354
 355 #endif