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/* Generic vector interface routine
* Copyright (C) 1997 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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 2, or (at your option) any
* later version.
*
* GNU Zebra 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "vector.h"
#include "memory.h"
DEFINE_MTYPE_STATIC(LIB, VECTOR, "Vector");
DEFINE_MTYPE_STATIC(LIB, VECTOR_INDEX, "Vector index");
/* Initialize vector : allocate memory and return vector. */
vector vector_init(unsigned int size)
{
vector v = XCALLOC(MTYPE_VECTOR, sizeof(struct _vector));
/* allocate at least one slot */
if (size == 0)
size = 1;
v->alloced = size;
v->active = 0;
v->count = 0;
v->index = XCALLOC(MTYPE_VECTOR_INDEX, sizeof(void *) * size);
return v;
}
void vector_free(vector v)
{
XFREE(MTYPE_VECTOR_INDEX, v->index);
XFREE(MTYPE_VECTOR, v);
}
vector vector_copy(vector v)
{
unsigned int size;
vector new = XCALLOC(MTYPE_VECTOR, sizeof(struct _vector));
new->active = v->active;
new->alloced = v->alloced;
new->count = v->count;
size = sizeof(void *) * (v->alloced);
new->index = XCALLOC(MTYPE_VECTOR_INDEX, size);
memcpy(new->index, v->index, size);
return new;
}
/* Check assigned index, and if it runs short double index pointer */
void vector_ensure(vector v, unsigned int num)
{
if (v->alloced > num)
return;
v->index = XREALLOC(MTYPE_VECTOR_INDEX, v->index,
sizeof(void *) * (v->alloced * 2));
memset(&v->index[v->alloced], 0, sizeof(void *) * v->alloced);
v->alloced *= 2;
if (v->alloced <= num)
vector_ensure(v, num);
}
/* This function only returns next empty slot index. It dose not mean
the slot's index memory is assigned, please call vector_ensure()
after calling this function. */
int vector_empty_slot(vector v)
{
unsigned int i;
if (v->active == v->count)
return v->active;
if (v->active == 0)
return 0;
for (i = 0; i < v->active; i++)
if (v->index[i] == 0)
return i;
return i;
}
/* Set value to the smallest empty slot. */
int vector_set(vector v, void *val)
{
unsigned int i;
i = vector_empty_slot(v);
vector_ensure(v, i);
if (v->index[i])
v->count--;
if (val)
v->count++;
v->index[i] = val;
if (v->active <= i)
v->active = i + 1;
return i;
}
/* Set value to specified index slot. */
int vector_set_index(vector v, unsigned int i, void *val)
{
vector_ensure(v, i);
if (v->index[i])
v->count--;
if (val)
v->count++;
v->index[i] = val;
if (v->active <= i)
v->active = i + 1;
return i;
}
/* Look up vector. */
void *vector_lookup(vector v, unsigned int i)
{
if (i >= v->active)
return NULL;
return v->index[i];
}
/* Lookup vector, ensure it. */
void *vector_lookup_ensure(vector v, unsigned int i)
{
vector_ensure(v, i);
return v->index[i];
}
/* Unset value at specified index slot. */
void vector_unset(vector v, unsigned int i)
{
if (i >= v->alloced)
return;
if (v->index[i])
v->count--;
v->index[i] = NULL;
if (i + 1 == v->active) {
v->active--;
while (i && v->index[--i] == NULL && v->active--)
; /* Is this ugly ? */
}
}
void vector_remove(vector v, unsigned int ix)
{
if (ix >= v->active)
return;
if (v->index[ix])
v->count--;
int n = (--v->active) - ix;
memmove(&v->index[ix], &v->index[ix + 1], n * sizeof(void *));
v->index[v->active] = NULL;
}
void vector_compact(vector v)
{
for (unsigned int i = 0; i < vector_active(v); ++i) {
if (vector_slot(v, i) == NULL) {
vector_remove(v, i);
--i;
}
}
}
void vector_unset_value(vector v, void *val)
{
size_t i;
for (i = 0; i < v->active; i++)
if (v->index[i] == val) {
v->index[i] = NULL;
v->count--;
break;
}
if (i + 1 == v->active)
do
v->active--;
while (i && v->index[--i] == NULL);
}
void vector_to_array(vector v, void ***dest, int *argc)
{
*dest = XCALLOC(MTYPE_TMP, sizeof(void *) * v->active);
memcpy(*dest, v->index, sizeof(void *) * v->active);
*argc = v->active;
}
vector array_to_vector(void **src, int argc)
{
vector v = vector_init(VECTOR_MIN_SIZE);
for (int i = 0; i < argc; i++)
vector_set_index(v, i, src[i]);
return v;
}
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