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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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "vector.h"
#include "memory.h"
/* 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->index = XCALLOC (MTYPE_VECTOR_INDEX, sizeof (void *) * size);
return v;
}
void
vector_only_wrapper_free (vector v)
{
XFREE (MTYPE_VECTOR, v);
}
void
vector_only_index_free (void *index)
{
XFREE (MTYPE_VECTOR_INDEX, index);
}
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;
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 == 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);
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);
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;
v->index[i] = NULL;
if (i + 1 == v->active)
{
v->active--;
while (i && v->index[--i] == NULL && v->active--)
; /* Is this ugly ? */
}
}
/* Count the number of not emplty slot. */
unsigned int
vector_count (vector v)
{
unsigned int i;
unsigned count = 0;
for (i = 0; i < v->active; i++)
if (v->index[i] != NULL)
count++;
return count;
}
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