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/******************************************************************************
*
* File: istack.c
*
* Created: 06/06/2001
*
* Author: Pavel Sakov
* CSIRO Marine Research
*
* Purpose: Handling stack of integers
*
* Description: None
*
* Revisions: None
*
*****************************************************************************/
#define STACK_NSTART 50
#define STACK_NINC 50
#include <stdlib.h>
#include <string.h>
#include "istack.h"
static void istack_init(istack* s)
{
s->n = 0;
s->nallocated = STACK_NSTART;
s->v = malloc(STACK_NSTART * sizeof(int));
}
istack* istack_create()
{
istack* s = malloc(sizeof(istack));
istack_init(s);
return s;
}
void istack_reset(istack* s)
{
s->n = 0;
}
int istack_contains(istack* s, int v)
{
int i;
for (i = 0; i < s->n; ++i)
if (s->v[i] == v)
return 1;
return 0;
}
void istack_push(istack* s, int v)
{
if (s->n == s->nallocated) {
s->v = realloc(s->v, (s->nallocated + STACK_NINC) * sizeof(int));
s->nallocated += STACK_NINC;
}
s->v[s->n] = v;
s->n++;
}
int istack_pop(istack* s)
{
s->n--;
return s->v[s->n];
}
void istack_destroy(istack* s)
{
if (s != NULL) {
free(s->v);
free(s);
}
}
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