db_fld_t* db_fld_copy(db_fld_t* fld)
{
int i, n;
db_fld_t* newp;
for(n = 0; fld[n].name; n++);
n++; /* We need to copy the terminating element too */
newp = (db_fld_t*)pkg_malloc(sizeof(db_fld_t) * n);
if (newp == NULL) {
ERR("db_fld: No memory left\n");
return NULL;
}
memcpy(newp, fld, sizeof(db_fld_t) * n);
for(i = 0; i < n; i++) {
if (db_gen_init(&newp[i].gen) < 0) goto error;
}
return newp;
error:
ERR("db_fld_copy() failed\n");
if (newp) {
/* Free everything allocated in this function so far */
while(i >= 0) {
db_gen_free(&newp[i].gen);
i--;
}
pkg_free(newp);
}
return NULL;
}
db_fld_t* db_fld(size_t n)
{
int i;
db_fld_t* newp;
newp = (db_fld_t*)pkg_malloc(sizeof(db_fld_t) * n);
if (newp == NULL) {
ERR("db_fld: No memory left\n");
return NULL;
}
memset(newp, '\0', sizeof(db_fld_t) * n);
for(i = 0; i < n; i++) {
if (db_gen_init(&newp[i].gen) < 0) goto error;
}
return newp;
error:
if (newp) {
while(i >= 0) {
db_gen_free(&newp[i].gen);
i--;
}
pkg_free(newp);
}
return NULL;
}
/*
* Create a new generic db_con structure representing a
* database connection and call the driver specific function
* in the driver that is associated with the structure based
* on the scheme of uri parameter
*/
db_con_t* db_con(db_ctx_t* ctx, db_uri_t* uri)
{
db_con_t* newp;
newp = (db_con_t*)pkg_malloc(sizeof(db_con_t));
if (newp == NULL) {
ERR("db_con: No memory left\n");
goto error;
}
memset(newp, '\0', sizeof(db_con_t));
if (db_gen_init(&newp->gen) < 0) goto error;
newp->uri = uri;
newp->ctx = ctx;
newp->connect = db_con_connect;
newp->disconnect = db_con_disconnect;
/* Call db_ctx function if the driver has it */
if (db_drv_call(&uri->scheme, "db_con", newp, ctx->con_n) < 0) {
goto error;
}
return newp;
error:
if (newp) {
db_gen_free(&newp->gen);
pkg_free(newp);
}
return NULL;
}
/*
* Releaase all memory used by the structure
*/
void db_con_free(db_con_t* con)
{
if (con == NULL) return;
db_gen_free(&con->gen);
if (con->uri) db_uri_free(con->uri);
pkg_free(con);
}
void db_fld_close(db_fld_t* fld)
{
int i;
for(i = 0; !DB_FLD_LAST(fld[i]); i++) {
db_gen_free(&fld[i].gen);
}
}
void db_fld_free(db_fld_t* fld)
{
int i;
if (DB_FLD_EMPTY(fld)) return;
for(i = 0; !DB_FLD_LAST(fld[i]); i++) {
db_gen_free(&fld[i].gen);
}
pkg_free(fld);
}
