mydb.c~

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "mydb.h"
#include "btree.h"

//int fseek(FILE *filename, long int offset, int origin);
struct DB *dbcreate(const char *file, const struct DBC conf)
{
 struct DB* new_base = (struct DB*)malloc(sizeof(struct DB));	
 new_base->fd = NULL;
 new_base->fd = fopen(file,"wb+");

 if(new_base->fd == NULL)
	printf("Error! File wasn't created!\n");

 new_base->head = (struct BTreeNode*)malloc(sizeof(struct BTreeNode));
 memset(new_base->head,0,sizeof(new_base->head));

 fprintf(new_base->fd,"%d%d%d%d",BTREE_KEY_CNT,BTREE_KEY_LEN,BTREE_VAL_LEN,BTREE_CHLD_CNT);
 fprintf(new_base->fd,"%d%d",(int)conf.db_size,(int)conf.chunk_size);
 
 int offset = ftell(new_base->fd); //Узнаем текущее смещение
 fprintf(new_base->fd,"%d",(int)(offset + sizeof(offset)) );//Пишем смещение главного листа B-дерева
 fwrite(new_base->head,1,sizeof(new_base->head),new_base->fd);

 head_offset = offset + sizeof(offset);

 return new_base;
}

struct DB *dbopen  (const char *file)
{ 
	struct DB* base = (struct DB*)malloc(sizeof(struct DB));
	memset(base,0,sizeof(base));
	return base;
}

int close(struct DB *db);
{
	if(db->head != NULL)
	{
		free(db->head);
		db->head = NULL;
	}
	if(db->fd != NULL)
	{
		fclose(db->fd);
	}
	return 0;
}
int get(const struct DB *db, struct DBT *key, struct DBT *data)
{
	int num = 0;
	BTreeNode* res = search_key(db->head,key->data,num,db);
	if(res == NULL)return -1;
	data->data = res->data; //BTreeNode data - ?
	return 0;
}

//----------------------------Код для поддержки тестирования---------------------------------------
int db_close(struct DB *db) {
	db->close(db);
}

int db_del(const struct DB *db, void *key, size_t key_len) {
	struct DBT keyt = {
		.data = key,
		.size = key_len
	};
	return db->del(db, &keyt);
}

int db_get(const struct DB *db, void *key, size_t key_len,
		void **val, size_t *val_len) {
	struct DBT keyt = {
		.data = key,
		.size = key_len
	};
	struct DBT valt = {0, 0};
	int rc = db->get(db, &keyt, &valt);
	*val = valt.data;
	*val_len = valt.size;
	return rc;
}

int db_put(const struct DB *db, void *key, size_t key_len,
		void *val, size_t val_len) {
	struct DBT keyt = {
		.data = key,
		.size = key_len
	};
	struct DBT valt = {
		.data = val,
		.size = val_len
	};
	return db->put(db, &keyt, &valt);
}