#include "dthdr.h"
static char* Version = "\n@(#)$Id: cdt (AT&T Research) 2005-04-20 $\0\n";
#if __STD_C
Dt_t* dtopen(Dtdisc_t* disc, Dtmethod_t* meth)
#else
Dt_t* dtopen(disc, meth)
Dtdisc_t* disc;
Dtmethod_t* meth;
#endif
{
Dt_t* dt = (Dt_t*)Version;
reg int e;
Dtdata_t* data;
if(!disc || !meth)
return NIL(Dt_t*);
if(!(dt = (Dt_t*) malloc(sizeof(Dt_t))))
return NIL(Dt_t*);
dt->searchf = NIL(Dtsearch_f);
dt->meth = NIL(Dtmethod_t*);
dt->disc = NIL(Dtdisc_t*);
dtdisc(dt,disc,0);
dt->type = DT_MALLOC;
dt->nview = 0;
dt->view = dt->walk = NIL(Dt_t*);
dt->user = NIL(Void_t*);
if(disc->eventf)
{
data = NIL(Dtdata_t*);
if((e = (*disc->eventf)(dt,DT_OPEN,(Void_t*)(&data),disc)) < 0)
goto err_open;
else if(e > 0)
{ if(data)
{ if(data->type&meth->type)
goto done;
else goto err_open;
}
if(!disc->memoryf)
goto err_open;
free((Void_t*)dt);
if(!(dt = (*disc->memoryf)(0, 0, sizeof(Dt_t), disc)) )
return NIL(Dt_t*);
dt->searchf = NIL(Dtsearch_f);
dt->meth = NIL(Dtmethod_t*);
dt->disc = NIL(Dtdisc_t*);
dtdisc(dt,disc,0);
dt->type = DT_MEMORYF;
dt->nview = 0;
dt->view = dt->walk = NIL(Dt_t*);
}
}
if(!(data = (Dtdata_t*)(dt->memoryf)(dt,NIL(Void_t*),sizeof(Dtdata_t),disc)) )
{ err_open:
free((Void_t*)dt);
return NIL(Dt_t*);
}
data->type = meth->type;
data->here = NIL(Dtlink_t*);
data->htab = NIL(Dtlink_t**);
data->ntab = data->size = data->loop = 0;
data->minp = 0;
done:
dt->data = data;
dt->searchf = meth->searchf;
dt->meth = meth;
if(disc->eventf)
(*disc->eventf)(dt, DT_ENDOPEN, (Void_t*)dt, disc);
return dt;
}