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#ifndef _PCILIB_UNIT_H
#define _PCILIB_UNIT_H
#include <uthash.h>
#include <pcilib.h>
#define PCILIB_UNIT_INVALID ((pcilib_unit_t)-1)
#define PCILIB_UNIT_TRANSFORM_INVALID ((pcilib_unit_transform_t)-1)
#define PCILIB_MAX_TRANSFORMS_PER_UNIT 16 /**< Limits number of supported transforms per unit */
typedef struct pcilib_unit_context_s pcilib_unit_context_t;
/**
* unit transformation routines
*/
typedef struct {
char *unit; /**< Name of the resulting unit */
char *transform; /**< String, similar to view formula, explaining transform to this unit */
} pcilib_unit_transform_t;
typedef struct {
char *name; /**< Unit name */
pcilib_unit_transform_t transforms[PCILIB_MAX_TRANSFORMS_PER_UNIT + 1]; /**< Transforms to other units */
} pcilib_unit_description_t;
struct pcilib_unit_context_s {
const char *name;
pcilib_unit_t unit;
UT_hash_handle hh;
};
#ifdef __cplusplus
extern "C" {
#endif
/**
* Use this function to add new unit definitions into the model. It is error to re-register
* already registered unit. The function will copy the context of unit description, but name,
* transform, and other strings in the structure are considered to have static duration
* and will not be copied. On error no new units are initalized.
* @param[in,out] ctx - pcilib context
* @param[in] n - number of units to initialize. It is OK to pass 0 if protocols variable is NULL terminated (last member of protocols array have all members set to 0)
* @param[in] desc - unit descriptions
* @return - error or 0 on success
*/
int pcilib_add_units(pcilib_t *ctx, size_t n, const pcilib_unit_description_t *desc);
/**
* Destroys data associated with units. This is an internal function and will
* be called during clean-up.
* @param[in,out] ctx - pcilib context
* @param[in] start - specifies first unit to clean (used to clean only part of the units to keep the defined state if pcilib_add_units has failed)
*/
void pcilib_clean_units(pcilib_t *ctx, pcilib_unit_t start);
/**
* Find unit id using supplied name.
* @param[in] ctx - pcilib context
* @param[in] unit - the requested unit name
* @return - unit id or PCILIB_UNIT_INVALID if error not found or error has occured
*/
pcilib_unit_t pcilib_find_unit_by_name(pcilib_t *ctx, const char *unit);
/**
* Find the required transform between two specified units.
* @param[in] ctx - pcilib context
* @param[in] from - the source unit
* @param[in] to - destination unit
* @return - the pointer to unit transform or NULL in case of error. If no transform required (i.e. \a from = \a to),
the function will return #pcilib_unit_transform_t structure with \a transform field set to NULL.
*/
pcilib_unit_transform_t *pcilib_find_transform_by_unit_names(pcilib_t *ctx, const char *from, const char *to);
/**
* Converts value to the requested units. It is error to convert values with unspecified units.
* This is internal function, use pcilib_value_convert_value_unit instead.
* @param[in,out] ctx - pcilib context
* @param[in] trans - the requested unit transform
* @param[in,out] value - the value to be converted (changed on success)
* @return - error or 0 on success
*/
int pcilib_transform_unit(pcilib_t *ctx, const pcilib_unit_transform_t *trans, pcilib_value_t *value);
/**
* Converts value to the requested units. It is error to convert values with unspecified units.
* This is internal function, use pcilib_value_convert_value_unit instead.
* @param[in,out] ctx - pcilib context
* @param[in] to - specifies the requested unit of the value
* @param[in,out] value - the value to be converted (changed on success)
* @return - error or 0 on success
*/
int pcilib_transform_unit_by_name(pcilib_t *ctx, const char *to, pcilib_value_t *value);
#ifdef __cplusplus
}
#endif
#endif /* _PCILIB_UNIT_H */
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