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/*
* vector.c:
* simple vectors
*
* Copyright (c) 2001 Chris Lightfoot. All rights reserved.
*
*/
static const char rcsid[] = "$Id: vector.c,v 1.3 2003/11/07 02:16:41 pdw Exp $";
#ifdef HAVE_CONFIG_H
/*include "configuration.h"*/
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <string.h>
#include "vector.h"
#include "iftop.h"
vector vector_new(void) {
vector v;
v = xcalloc(1, sizeof *v);
if (!v) return NULL;
v->ary = xcalloc(16, sizeof *v->ary);
v->n = 16;
v->n_used = 0;
return v;
}
void vector_delete(vector v) {
xfree(v->ary);
xfree(v);
}
void vector_delete_free(vector v) {
item *i;
vector_iterate(v, i) {
xfree(i->v);
}
xfree(v->ary);
xfree(v);
}
void vector_push_back(vector v, const item t) {
if (v->n_used == v->n) vector_reallocate(v, v->n * 2);
v->ary[v->n_used++] = t;
}
void vector_pop_back(vector v) {
if (v->n_used > 0) {
--v->n_used;
if (v->n_used < v->n / 2) vector_reallocate(v, v->n / 2);
}
}
item vector_back(vector v) {
return v->ary[v->n_used - 1];
}
item *vector_remove(vector v, item *t) {
if (t >= v->ary + v->n_used) return NULL;
if (t < v->ary + v->n_used - 1)
memmove(t, t + 1, (v->n_used - (t - v->ary)) * sizeof(item));
memset(v->ary + v->n_used--, 0, sizeof(item));
if (v->n_used < v->n / 2 && v->n > 16) {
size_t i = t - v->ary;
vector_reallocate(v, v->n / 2);
t = v->ary + i;
}
return t;
}
void vector_reallocate(vector v, const size_t n) {
if (n < v->n_used || n <= 0) return;
v->ary = xrealloc(v->ary, n * sizeof(item));
memset(v->ary + v->n_used, 0, (v->n - v->n_used) * sizeof(item));
v->n = n;
}
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