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#ifndef DISCOVERY_CONFIG_H
#define DISCOVERY_CONFIG_H
/**
* @file config.h
* @brief Simple key=value configuration file parser.
*
* Parses configuration files with one key=value pair per line.
* Lines starting with '#' are comments. Blank lines are ignored.
*/
#include <stddef.h>
/**
* @brief A single key=value entry from a config file.
*
* Both key and value are heap-allocated, null-terminated strings
* with leading/trailing whitespace trimmed.
*/
typedef struct
{
char *key;
char *value;
} config_entry;
/**
* @brief A parsed configuration file.
*
* Holds a dynamic array of config_entry items.
*/
typedef struct
{
config_entry *entries;
size_t count;
size_t capacity;
} config;
/**
* @brief Parses a configuration file into a config structure.
*
* Each non-blank, non-comment line must contain '=' separating key
* and value. Whitespace is trimmed around both key and value.
*
* @param path Path to the configuration file.
* @param cfg Output: the parsed configuration. Must be freed
* with config_free() when no longer needed.
* @return 0 on success, -1 on error (logged via UA_LOG_ERROR).
*/
int config_load (const char *path, config *cfg);
/**
* @brief Looks up a single-valued key.
*
* Returns the value of the first entry matching @p key, or NULL
* if the key is not present.
*
* @param cfg The parsed configuration.
* @param key The key to search for.
* @return The value string (owned by cfg), or NULL.
*/
const char *config_get (const config *cfg, const char *key);
/**
* @brief Looks up a required single-valued key.
*
* Like config_get(), but logs a FATAL error and returns NULL when
* the key is missing.
*
* @param cfg The parsed configuration.
* @param key The key to search for.
* @param program Program name (for error messages).
* @return The value string (owned by cfg), or NULL if missing.
*/
const char *config_require (const config *cfg, const char *key,
const char *program);
/**
* @brief Looks up a required integer-valued key.
*
* Parses the value of @p key as an integer. If the key is
* missing or the value is not a valid integer, logs a FATAL
* error and returns -1.
*
* @param cfg The parsed configuration.
* @param key The key to search for.
* @param program Program name (for error messages).
* @return The parsed integer, or -1 on error.
*/
int config_require_int (const config *cfg, const char *key,
const char *program);
/**
* @brief Frees all memory owned by a config structure.
*
* After this call the config is zeroed and must not be used
* unless config_load() is called again.
*
* @param cfg The configuration to free.
*/
void config_free (config *cfg);
#endif /* DISCOVERY_CONFIG_H */
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