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#include "callstack.h"
#include "debug.h"
#include "mem.h"
#include "timing.h"
#include "config.h"
int
slen(_cstack *cs)
{
return 1 + cs->head;
}
_cstack *
screate(int size)
{
int i;
_cstack *cs;
cs = (_cstack *)ymalloc(sizeof(_cstack));
if (!cs)
return NULL;
cs->_items = ymalloc(size * sizeof(_cstackitem));
if (cs->_items == NULL) {
yfree(cs);
return NULL;
}
for(i=0; i<size; i++) {
cs->_items[i].ckey = 0;
cs->_items[i].t0 = 0;
}
cs->size = size;
cs->head = -1;
return cs;
}
static int
_sgrow(_cstack * cs)
{
int i;
_cstack *dummy;
dummy = screate(cs->size*2);
if(!dummy)
return 0;
for(i=0; i<cs->size; i++) {
dummy->_items[i].ckey = cs->_items[i].ckey;
dummy->_items[i].t0 = cs->_items[i].t0;
}
yfree(cs->_items);
cs->_items = dummy->_items;
cs->size = dummy->size;
yfree(dummy);
return 1;
}
void
sdestroy(_cstack * cs)
{
yfree(cs->_items);
yfree(cs);
}
_cstackitem *
spush(_cstack *cs, void *ckey)
{
_cstackitem *ci;
if (cs->head >= cs->size-1) {
if (!_sgrow(cs))
return NULL;
}
ci = &cs->_items[++cs->head];
ci->ckey = ckey;
return ci;
}
_cstackitem *
spop(_cstack * cs)
{
_cstackitem *ci;
if (cs->head < 0)
return NULL;
ci = &cs->_items[cs->head--];
return ci;
}
_cstackitem *
shead(_cstack * cs)
{
if (cs->head < 0)
return NULL;
return &cs->_items[cs->head];
}
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