config.h

   1 #ifndef CONFIG_H
   2 #define CONFIG_H
   3
   4 #include "hashmap.h"
   5 #include "string-list.h"
   6
   7
   8 /**
   9  * The config API gives callers a way to access Git configuration files
  10  * (and files which have the same syntax).
  11  *
  12  * General Usage
  13  * -------------
  14  *
  15  * Config files are parsed linearly, and each variable found is passed to a
  16  * caller-provided callback function. The callback function is responsible
  17  * for any actions to be taken on the config option, and is free to ignore
  18  * some options. It is not uncommon for the configuration to be parsed
  19  * several times during the run of a Git program, with different callbacks
  20  * picking out different variables useful to themselves.
  21  */
  22
  23 struct object_id;
  24
  25 /* git_config_parse_key() returns these negated: */
  26 #define CONFIG_INVALID_KEY 1
  27 #define CONFIG_NO_SECTION_OR_NAME 2
  28 /* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */
  29 #define CONFIG_NO_LOCK -1
  30 #define CONFIG_INVALID_FILE 3
  31 #define CONFIG_NO_WRITE 4
  32 #define CONFIG_NOTHING_SET 5
  33 #define CONFIG_INVALID_PATTERN 6
  34 #define CONFIG_GENERIC_ERROR 7
  35
  36 #define CONFIG_REGEX_NONE ((void *)1)
  37
  38 enum config_scope {
  39         CONFIG_SCOPE_UNKNOWN = 0,
  40         CONFIG_SCOPE_SYSTEM,
  41         CONFIG_SCOPE_GLOBAL,
  42         CONFIG_SCOPE_LOCAL,
  43         CONFIG_SCOPE_WORKTREE,
  44         CONFIG_SCOPE_COMMAND,
  45         CONFIG_SCOPE_SUBMODULE,
  46 };
  47 const char *config_scope_name(enum config_scope scope);
  48
  49 struct git_config_source {
  50         unsigned int use_stdin:1;
  51         const char *file;
  52         /* The repository if blob is not NULL; leave blank for the_repository */
  53         struct repository *repo;
  54         const char *blob;
  55         enum config_scope scope;
  56 };
  57
  58 enum config_origin_type {
  59         CONFIG_ORIGIN_BLOB,
  60         CONFIG_ORIGIN_FILE,
  61         CONFIG_ORIGIN_STDIN,
  62         CONFIG_ORIGIN_SUBMODULE_BLOB,
  63         CONFIG_ORIGIN_CMDLINE
  64 };
  65
  66 enum config_event_t {
  67         CONFIG_EVENT_SECTION,
  68         CONFIG_EVENT_ENTRY,
  69         CONFIG_EVENT_WHITESPACE,
  70         CONFIG_EVENT_COMMENT,
  71         CONFIG_EVENT_EOF,
  72         CONFIG_EVENT_ERROR
  73 };
  74
  75 /*
  76  * The parser event function (if not NULL) is called with the event type and
  77  * the begin/end offsets of the parsed elements.
  78  *
  79  * Note: for CONFIG_EVENT_ENTRY (i.e. config variables), the trailing newline
  80  * character is considered part of the element.
  81  */
  82 typedef int (*config_parser_event_fn_t)(enum config_event_t type,
  83                                         size_t begin_offset, size_t end_offset,
  84                                         void *event_fn_data);
  85
  86 struct config_options {
  87         unsigned int respect_includes : 1;
  88         unsigned int ignore_repo : 1;
  89         unsigned int ignore_worktree : 1;
  90         unsigned int ignore_cmdline : 1;
  91         unsigned int system_gently : 1;
  92
  93         /*
  94          * For internal use. Include all includeif.hasremoteurl paths without
  95          * checking if the repo has that remote URL, and when doing so, verify
  96          * that files included in this way do not configure any remote URLs
  97          * themselves.
  98          */
  99         unsigned int unconditional_remote_url : 1;
 100
 101         const char *commondir;
 102         const char *git_dir;
 103         config_parser_event_fn_t event_fn;
 104         void *event_fn_data;
 105         enum config_error_action {
 106                 CONFIG_ERROR_UNSET = 0, /* use source-specific default */
 107                 CONFIG_ERROR_DIE, /* die() on error */
 108                 CONFIG_ERROR_ERROR, /* error() on error, return -1 */
 109                 CONFIG_ERROR_SILENT, /* return -1 */
 110         } error_action;
 111 };
 112
 113 /**
 114  * A config callback function takes three parameters:
 115  *
 116  * - the name of the parsed variable. This is in canonical "flat" form: the
 117  *   section, subsection, and variable segments will be separated by dots,
 118  *   and the section and variable segments will be all lowercase. E.g.,
 119  *   `core.ignorecase`, `diff.SomeType.textconv`.
 120  *
 121  * - the value of the found variable, as a string. If the variable had no
 122  *   value specified, the value will be NULL (typically this means it
 123  *   should be interpreted as boolean true).
 124  *
 125  * - a void pointer passed in by the caller of the config API; this can
 126  *   contain callback-specific data
 127  *
 128  * A config callback should return 0 for success, or -1 if the variable
 129  * could not be parsed properly.
 130  */
 131 typedef int (*config_fn_t)(const char *, const char *, void *);
 132
 133 int git_default_config(const char *, const char *, void *);
 134
 135 /**
 136  * Read a specific file in git-config format.
 137  * This function takes the same callback and data parameters as `git_config`.
 138  *
 139  * Unlike git_config(), this function does not respect includes.
 140  */
 141 int git_config_from_file(config_fn_t fn, const char *, void *);
 142
 143 int git_config_from_file_with_options(config_fn_t fn, const char *,
 144                                       void *,
 145                                       const struct config_options *);
 146 int git_config_from_mem(config_fn_t fn,
 147                         const enum config_origin_type,
 148                         const char *name,
 149                         const char *buf, size_t len,
 150                         void *data, const struct config_options *opts);
 151 int git_config_from_blob_oid(config_fn_t fn, const char *name,
 152                              struct repository *repo,
 153                              const struct object_id *oid, void *data);
 154 void git_config_push_parameter(const char *text);
 155 void git_config_push_env(const char *spec);
 156 int git_config_from_parameters(config_fn_t fn, void *data);
 157 void read_early_config(config_fn_t cb, void *data);
 158 void read_very_early_config(config_fn_t cb, void *data);
 159
 160 /**
 161  * Most programs will simply want to look up variables in all config files
 162  * that Git knows about, using the normal precedence rules. To do this,
 163  * call `git_config` with a callback function and void data pointer.
 164  *
 165  * `git_config` will read all config sources in order of increasing
 166  * priority. Thus a callback should typically overwrite previously-seen
 167  * entries with new ones (e.g., if both the user-wide `~/.gitconfig` and
 168  * repo-specific `.git/config` contain `color.ui`, the config machinery
 169  * will first feed the user-wide one to the callback, and then the
 170  * repo-specific one; by overwriting, the higher-priority repo-specific
 171  * value is left at the end).
 172  *
 173  * Unlike git_config_from_file(), this function respects includes.
 174  */
 175 void git_config(config_fn_t fn, void *);
 176
 177 /**
 178  * Lets the caller examine config while adjusting some of the default
 179  * behavior of `git_config`. It should almost never be used by "regular"
 180  * Git code that is looking up configuration variables.
 181  * It is intended for advanced callers like `git-config`, which are
 182  * intentionally tweaking the normal config-lookup process.
 183  * It takes two extra parameters:
 184  *
 185  * - `config_source`
 186  * If this parameter is non-NULL, it specifies the source to parse for
 187  * configuration, rather than looking in the usual files. See `struct
 188  * git_config_source` in `config.h` for details. Regular `git_config` defaults
 189  * to `NULL`.
 190  *
 191  * - `opts`
 192  * Specify options to adjust the behavior of parsing config files. See `struct
 193  * config_options` in `config.h` for details. As an example: regular `git_config`
 194  * sets `opts.respect_includes` to `1` by default.
 195  */
 196 int config_with_options(config_fn_t fn, void *,
 197                         struct git_config_source *config_source,
 198                         const struct config_options *opts);
 199
 200 /**
 201  * Value Parsing Helpers
 202  * ---------------------
 203  *
 204  * The following helper functions aid in parsing string values
 205  */
 206
 207 int git_parse_ssize_t(const char *, ssize_t *);
 208 int git_parse_ulong(const char *, unsigned long *);
 209 int git_parse_int(const char *value, int *ret);
 210
 211 /**
 212  * Same as `git_config_bool`, except that it returns -1 on error rather
 213  * than dying.
 214  */
 215 int git_parse_maybe_bool(const char *);
 216
 217 /**
 218  * Parse the string to an integer, including unit factors. Dies on error;
 219  * otherwise, returns the parsed result.
 220  */
 221 int git_config_int(const char *, const char *);
 222
 223 int64_t git_config_int64(const char *, const char *);
 224
 225 /**
 226  * Identical to `git_config_int`, but for unsigned longs.
 227  */
 228 unsigned long git_config_ulong(const char *, const char *);
 229
 230 ssize_t git_config_ssize_t(const char *, const char *);
 231
 232 /**
 233  * Same as `git_config_bool`, except that integers are returned as-is, and
 234  * an `is_bool` flag is unset.
 235  */
 236 int git_config_bool_or_int(const char *, const char *, int *);
 237
 238 /**
 239  * Parse a string into a boolean value, respecting keywords like "true" and
 240  * "false". Integer values are converted into true/false values (when they
 241  * are non-zero or zero, respectively). Other values cause a die(). If
 242  * parsing is successful, the return value is the result.
 243  */
 244 int git_config_bool(const char *, const char *);
 245
 246 /**
 247  * Allocates and copies the value string into the `dest` parameter; if no
 248  * string is given, prints an error message and returns -1.
 249  */
 250 int git_config_string(const char **, const char *, const char *);
 251
 252 /**
 253  * Similar to `git_config_string`, but expands `~` or `~user` into the
 254  * user's home directory when found at the beginning of the path.
 255  */
 256 int git_config_pathname(const char **, const char *, const char *);
 257
 258 int git_config_expiry_date(timestamp_t *, const char *, const char *);
 259 int git_config_color(char *, const char *, const char *);
 260 int git_config_set_in_file_gently(const char *, const char *, const char *);
 261
 262 /**
 263  * write config values to a specific config file, takes a key/value pair as
 264  * parameter.
 265  */
 266 void git_config_set_in_file(const char *, const char *, const char *);
 267
 268 int git_config_set_gently(const char *, const char *);
 269
 270 /**
 271  * Write a config value that should apply to the current worktree. If
 272  * extensions.worktreeConfig is enabled, then the write will happen in the
 273  * current worktree's config. Otherwise, write to the common config file.
 274  */
 275 int repo_config_set_worktree_gently(struct repository *, const char *, const char *);
 276
 277 /**
 278  * write config values to `.git/config`, takes a key/value pair as parameter.
 279  */
 280 void git_config_set(const char *, const char *);
 281
 282 int git_config_parse_key(const char *, char **, size_t *);
 283
 284 /*
 285  * The following macros specify flag bits that alter the behavior
 286  * of the git_config_set_multivar*() methods.
 287  */
 288
 289 /*
 290  * When CONFIG_FLAGS_MULTI_REPLACE is specified, all matching key/values
 291  * are removed before a single new pair is written. If the flag is not
 292  * present, then set operations replace only the first match.
 293  */
 294 #define CONFIG_FLAGS_MULTI_REPLACE (1 << 0)
 295
 296 /*
 297  * When CONFIG_FLAGS_FIXED_VALUE is specified, match key/value pairs
 298  * by string comparison (not regex match) to the provided value_pattern
 299  * parameter.
 300  */
 301 #define CONFIG_FLAGS_FIXED_VALUE (1 << 1)
 302
 303 int git_config_set_multivar_gently(const char *, const char *, const char *, unsigned);
 304 void git_config_set_multivar(const char *, const char *, const char *, unsigned);
 305 int repo_config_set_multivar_gently(struct repository *, const char *, const char *, const char *, unsigned);
 306 int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, unsigned);
 307
 308 /**
 309  * takes four parameters:
 310  *
 311  * - the name of the file, as a string, to which key/value pairs will be written.
 312  *
 313  * - the name of key, as a string. This is in canonical "flat" form: the section,
 314  *   subsection, and variable segments will be separated by dots, and the section
 315  *   and variable segments will be all lowercase.
 316  *   E.g., `core.ignorecase`, `diff.SomeType.textconv`.
 317  *
 318  * - the value of the variable, as a string. If value is equal to NULL, it will
 319  *   remove the matching key from the config file.
 320  *
 321  * - the value regex, as a string. It will disregard key/value pairs where value
 322  *   does not match.
 323  *
 324  * - a flags value with bits corresponding to the CONFIG_FLAG_* macros.
 325  *
 326  * It returns 0 on success.
 327  */
 328 void git_config_set_multivar_in_file(const char *config_filename,
 329                                      const char *key,
 330                                      const char *value,
 331                                      const char *value_pattern,
 332                                      unsigned flags);
 333
 334 /**
 335  * rename or remove sections in the config file
 336  * parameters `old_name` and `new_name`
 337  * If NULL is passed through `new_name` parameter,
 338  * the section will be removed from the config file.
 339  */
 340 int git_config_rename_section(const char *, const char *);
 341
 342 int git_config_rename_section_in_file(const char *, const char *, const char *);
 343 int git_config_copy_section(const char *, const char *);
 344 int git_config_copy_section_in_file(const char *, const char *, const char *);
 345 int git_env_bool(const char *, int);
 346 unsigned long git_env_ulong(const char *, unsigned long);
 347 int git_config_system(void);
 348 int config_error_nonbool(const char *);
 349 #if defined(__GNUC__)
 350 #define config_error_nonbool(s) (config_error_nonbool(s), const_error())
 351 #endif
 352
 353 char *git_system_config(void);
 354 void git_global_config(char **user, char **xdg);
 355
 356 int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
 357
 358 enum config_scope current_config_scope(void);
 359 const char *current_config_origin_type(void);
 360 const char *current_config_name(void);
 361 int current_config_line(void);
 362
 363 /*
 364  * Match and parse a config key of the form:
 365  *
 366  *   section.(subsection.)?key
 367  *
 368  * (i.e., what gets handed to a config_fn_t). The caller provides the section;
 369  * we return -1 if it does not match, 0 otherwise. The subsection and key
 370  * out-parameters are filled by the function (and *subsection is NULL if it is
 371  * missing).
 372  *
 373  * If the subsection pointer-to-pointer passed in is NULL, returns 0 only if
 374  * there is no subsection at all.
 375  */
 376 int parse_config_key(const char *var,
 377                      const char *section,
 378                      const char **subsection, size_t *subsection_len,
 379                      const char **key);
 380
 381 /**
 382  * Custom Configsets
 383  * -----------------
 384  *
 385  * A `config_set` can be used to construct an in-memory cache for
 386  * config-like files that the caller specifies (i.e., files like `.gitmodules`,
 387  * `~/.gitconfig` etc.). For example,
 388  *
 389  * ----------------------------------------
 390  * struct config_set gm_config;
 391  * git_configset_init(&gm_config);
 392  * int b;
 393  * //we add config files to the config_set
 394  * git_configset_add_file(&gm_config, ".gitmodules");
 395  * git_configset_add_file(&gm_config, ".gitmodules_alt");
 396  *
 397  * if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) {
 398  * //hack hack hack
 399  * }
 400  *
 401  * when we are done with the configset:
 402  * git_configset_clear(&gm_config);
 403  * ----------------------------------------
 404  *
 405  * Configset API provides functions for the above mentioned work flow
 406  */
 407
 408 struct config_set_element {
 409         struct hashmap_entry ent;
 410         char *key;
 411         struct string_list value_list;
 412 };
 413
 414 struct configset_list_item {
 415         struct config_set_element *e;
 416         int value_index;
 417 };
 418
 419 /*
 420  * the contents of the list are ordered according to their
 421  * position in the config files and order of parsing the files.
 422  * (i.e. key-value pair at the last position of .git/config will
 423  * be at the last item of the list)
 424  */
 425 struct configset_list {
 426         struct configset_list_item *items;
 427         unsigned int nr, alloc;
 428 };
 429
 430 struct config_set {
 431         struct hashmap config_hash;
 432         int hash_initialized;
 433         struct configset_list list;
 434 };
 435
 436 /**
 437  * Initializes the config_set `cs`.
 438  */
 439 void git_configset_init(struct config_set *cs);
 440
 441 /**
 442  * Parses the file and adds the variable-value pairs to the `config_set`,
 443  * dies if there is an error in parsing the file. Returns 0 on success, or
 444  * -1 if the file does not exist or is inaccessible. The caller decides
 445  * whether to free the incomplete configset or continue using it when
 446  * the function returns -1.
 447  */
 448 int git_configset_add_file(struct config_set *cs, const char *filename);
 449
 450 /**
 451  * Finds and returns the value list, sorted in order of increasing priority
 452  * for the configuration variable `key` and config set `cs`. When the
 453  * configuration variable `key` is not found, returns NULL. The caller
 454  * should not free or modify the returned pointer, as it is owned by the cache.
 455  */
 456 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key);
 457
 458 /**
 459  * Clears `config_set` structure, removes all saved variable-value pairs.
 460  */
 461 void git_configset_clear(struct config_set *cs);
 462
 463 /*
 464  * These functions return 1 if not found, and 0 if found, leaving the found
 465  * value in the 'dest' pointer.
 466  */
 467
 468 /*
 469  * Finds the highest-priority value for the configuration variable `key`
 470  * and config set `cs`, stores the pointer to it in `value` and returns 0.
 471  * When the configuration variable `key` is not found, returns 1 without
 472  * touching `value`. The caller should not free or modify `value`, as it
 473  * is owned by the cache.
 474  */
 475 int git_configset_get_value(struct config_set *cs, const char *key, const char **dest);
 476
 477 int git_configset_get_string(struct config_set *cs, const char *key, char **dest);
 478 int git_configset_get_int(struct config_set *cs, const char *key, int *dest);
 479 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest);
 480 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest);
 481 int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest);
 482 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest);
 483 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest);
 484
 485 /* Functions for reading a repository's config */
 486 struct repository;
 487 void repo_config(struct repository *repo, config_fn_t fn, void *data);
 488 int repo_config_get_value(struct repository *repo,
 489                           const char *key, const char **value);
 490 const struct string_list *repo_config_get_value_multi(struct repository *repo,
 491                                                       const char *key);
 492 int repo_config_get_string(struct repository *repo,
 493                            const char *key, char **dest);
 494 int repo_config_get_string_tmp(struct repository *repo,
 495                                const char *key, const char **dest);
 496 int repo_config_get_int(struct repository *repo,
 497                         const char *key, int *dest);
 498 int repo_config_get_ulong(struct repository *repo,
 499                           const char *key, unsigned long *dest);
 500 int repo_config_get_bool(struct repository *repo,
 501                          const char *key, int *dest);
 502 int repo_config_get_bool_or_int(struct repository *repo,
 503                                 const char *key, int *is_bool, int *dest);
 504 int repo_config_get_maybe_bool(struct repository *repo,
 505                                const char *key, int *dest);
 506 int repo_config_get_pathname(struct repository *repo,
 507                              const char *key, const char **dest);
 508
 509 /*
 510  * Functions for reading protected config. By definition, protected
 511  * config ignores repository config, so these do not take a `struct
 512  * repository` parameter.
 513  */
 514 void git_protected_config(config_fn_t fn, void *data);
 515
 516 /**
 517  * Querying For Specific Variables
 518  * -------------------------------
 519  *
 520  * For programs wanting to query for specific variables in a non-callback
 521  * manner, the config API provides two functions `git_config_get_value`
 522  * and `git_config_get_value_multi`. They both read values from an internal
 523  * cache generated previously from reading the config files.
 524  */
 525
 526 /**
 527  * Finds the highest-priority value for the configuration variable `key`,
 528  * stores the pointer to it in `value` and returns 0. When the
 529  * configuration variable `key` is not found, returns 1 without touching
 530  * `value`. The caller should not free or modify `value`, as it is owned
 531  * by the cache.
 532  */
 533 int git_config_get_value(const char *key, const char **value);
 534
 535 /**
 536  * Finds and returns the value list, sorted in order of increasing priority
 537  * for the configuration variable `key`. When the configuration variable
 538  * `key` is not found, returns NULL. The caller should not free or modify
 539  * the returned pointer, as it is owned by the cache.
 540  */
 541 const struct string_list *git_config_get_value_multi(const char *key);
 542
 543 /**
 544  * Resets and invalidates the config cache.
 545  */
 546 void git_config_clear(void);
 547
 548 /**
 549  * Allocates and copies the retrieved string into the `dest` parameter for
 550  * the configuration variable `key`; if NULL string is given, prints an
 551  * error message and returns -1. When the configuration variable `key` is
 552  * not found, returns 1 without touching `dest`.
 553  */
 554 int git_config_get_string(const char *key, char **dest);
 555
 556 /**
 557  * Similar to `git_config_get_string`, but does not allocate any new
 558  * memory; on success `dest` will point to memory owned by the config
 559  * machinery, which could be invalidated if it is discarded and reloaded.
 560  */
 561 int git_config_get_string_tmp(const char *key, const char **dest);
 562
 563 /**
 564  * Finds and parses the value to an integer for the configuration variable
 565  * `key`. Dies on error; otherwise, stores the value of the parsed integer in
 566  * `dest` and returns 0. When the configuration variable `key` is not found,
 567  * returns 1 without touching `dest`.
 568  */
 569 int git_config_get_int(const char *key, int *dest);
 570
 571 /**
 572  * Similar to `git_config_get_int` but for unsigned longs.
 573  */
 574 int git_config_get_ulong(const char *key, unsigned long *dest);
 575
 576 /**
 577  * Finds and parses the value into a boolean value, for the configuration
 578  * variable `key` respecting keywords like "true" and "false". Integer
 579  * values are converted into true/false values (when they are non-zero or
 580  * zero, respectively). Other values cause a die(). If parsing is successful,
 581  * stores the value of the parsed result in `dest` and returns 0. When the
 582  * configuration variable `key` is not found, returns 1 without touching
 583  * `dest`.
 584  */
 585 int git_config_get_bool(const char *key, int *dest);
 586
 587 /**
 588  * Similar to `git_config_get_bool`, except that integers are copied as-is,
 589  * and `is_bool` flag is unset.
 590  */
 591 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
 592
 593 /**
 594  * Similar to `git_config_get_bool`, except that it returns -1 on error
 595  * rather than dying.
 596  */
 597 int git_config_get_maybe_bool(const char *key, int *dest);
 598
 599 /**
 600  * Similar to `git_config_get_string`, but expands `~` or `~user` into
 601  * the user's home directory when found at the beginning of the path.
 602  */
 603 int git_config_get_pathname(const char *key, const char **dest);
 604
 605 int git_config_get_index_threads(int *dest);
 606 int git_config_get_split_index(void);
 607 int git_config_get_max_percent_split_change(void);
 608
 609 /* This dies if the configured or default date is in the future */
 610 int git_config_get_expiry(const char *key, const char **output);
 611
 612 /* parse either "this many days" integer, or "5.days.ago" approxidate */
 613 int git_config_get_expiry_in_days(const char *key, timestamp_t *, timestamp_t now);
 614
 615 struct key_value_info {
 616         const char *filename;
 617         int linenr;
 618         enum config_origin_type origin_type;
 619         enum config_scope scope;
 620 };
 621
 622 /**
 623  * First prints the error message specified by the caller in `err` and then
 624  * dies printing the line number and the file name of the highest priority
 625  * value for the configuration variable `key`.
 626  */
 627 NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3)));
 628
 629 /**
 630  * Helper function which formats the die error message according to the
 631  * parameters entered. Used by `git_die_config()`. It can be used by callers
 632  * handling `git_config_get_value_multi()` to print the correct error message
 633  * for the desired value.
 634  */
 635 NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr);
 636
 637 #define LOOKUP_CONFIG(mapping, var) \
 638         lookup_config(mapping, ARRAY_SIZE(mapping), var)
 639 int lookup_config(const char **mapping, int nr_mapping, const char *var);
 640
 641 #endif /* CONFIG_H */