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ptrstack.c
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ptrstack.c
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/*
* Stack for pointers
*
* Copyright (c) 2010, 2011 lxd <i@lxd.me>
*
* This file is part of File Synchronization System(fss).
*
* fss is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License,
* (at your option) any later version.
*
* fss is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with fss. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ptrstack.h"
#include <stdlib.h>
#include <assert.h>
ptrstack* init_ptrstack(uint64_t sz)
{
void *vptr = calloc(1, sizeof(ptrstack) + sizeof(void*) * sz);
ptrstack *ps = (ptrstack*)vptr;
ps->elem = vptr + sizeof(ptrstack);
ps->size = sz;
ps->stacktop = 0;
return ps;
}
void* ptrstack_top(ptrstack *ps)
{
return ps->stacktop == 0 ? NULL : *(ps->elem + ps->stacktop - 1);
}
void* ptrstack_pop(ptrstack *ps)
{
return ps->stacktop == 0 ? NULL : *(ps->elem + --ps->stacktop);
}
void* ptrstack_push(ptrstack *ps, void *eptr)
{
// TODO: The assert here should be replaced by more detailed
// stackoverflow check statements
assert(ps->stacktop < ps->size);
*(ps->elem + ps->stacktop++) = eptr;
return eptr;
}
void cleanup_ptrstack(ptrstack *ps)
{
assert(ps);
free(ps);
}