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/*
* Simple pointer stack
*
* (c) 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
*/
#include "util.h"
#include "pstack.h"
#include <linux/kernel.h>
#include <stdlib.h>
struct pstack {
unsigned short top;
unsigned short max_nr_entries;
void *entries[0];
};
struct pstack *pstack__new(unsigned short max_nr_entries)
{
struct pstack *self = zalloc((sizeof(*self) +
max_nr_entries * sizeof(void *)));
if (self != NULL)
self->max_nr_entries = max_nr_entries;
return self;
}
void pstack__delete(struct pstack *self)
{
free(self);
}
bool pstack__empty(const struct pstack *self)
{
return self->top == 0;
}
void pstack__remove(struct pstack *self, void *key)
{
unsigned short i = self->top, last_index = self->top - 1;
while (i-- != 0) {
if (self->entries[i] == key) {
if (i < last_index)
memmove(self->entries + i,
self->entries + i + 1,
(last_index - i) * sizeof(void *));
--self->top;
return;
}
}
pr_err("%s: %p not on the pstack!\n", __func__, key);
}
void pstack__push(struct pstack *self, void *key)
{
if (self->top == self->max_nr_entries) {
pr_err("%s: top=%d, overflow!\n", __func__, self->top);
return;
}
self->entries[self->top++] = key;
}
void *pstack__pop(struct pstack *self)
{
void *ret;
if (self->top == 0) {
pr_err("%s: underflow!\n", __func__);
return NULL;
}
ret = self->entries[--self->top];
self->entries[self->top] = NULL;
return ret;
}
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