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/**
* @file command.c
* @brief Implementation of commands.
*/
#include <search.h> /* tfind, tdestroy, twalk */
#include <stdio.h>
#include "command.h"
/* Commands are registered in the following tree. */
static void * commands_root = NULL; /**< Tree ordered by name */
static void nothing_to_free() {}
#ifdef __linux__
__attribute__((destructor))
static
void
command_clear()
{
tdestroy(commands_root, nothing_to_free);
}
#endif /* __linux__ */
static
int
_command_compare(const command_parser_t * c1,
const command_parser_t * c2)
{
if (c1->action != c2->action)
return c2->action - c1->action;
if (c1->object != c2->object)
return c2->object - c1->object;
if (c1->nparams != c2->nparams)
return c2->nparams - c1->nparams;
return 0;
}
#define command_compare (int (*)(const void *, const void *))(_command_compare)
void
command_register(const command_parser_t * command)
{
// Insert the command in the tree if the keys does not exist yet
tsearch(command, &commands_root, command_compare);
}
const command_parser_t *
command_search(hc_action_t action, hc_object_type_t object, unsigned nparams)
{
command_parser_t ** command, search;
search.action = action;
search.object = object;
search.nparams = nparams;
command = tfind(&search, &commands_root, command_compare);
return command ? *command : NULL;
}
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