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/*
* ptrarray.c
* simple pointer array implementation
*
* Copyright (c) 2011-2019 Nikias Bassen, All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ptrarray.h"
#include <string.h>
ptrarray_t *ptr_array_new(int capacity)
{
ptrarray_t *pa = (ptrarray_t*)malloc(sizeof(ptrarray_t));
pa->pdata = (void**)malloc(sizeof(void*) * capacity);
pa->capacity = capacity;
pa->capacity_step = (capacity > 4096) ? 4096 : capacity;
pa->len = 0;
return pa;
}
void ptr_array_free(ptrarray_t *pa)
{
if (!pa) return;
if (pa->pdata) {
free(pa->pdata);
}
free(pa);
}
void ptr_array_insert(ptrarray_t *pa, void *data, long array_index)
{
if (!pa || !pa->pdata) return;
long remaining = pa->capacity-pa->len;
if (remaining == 0) {
pa->pdata = realloc(pa->pdata, sizeof(void*) * (pa->capacity + pa->capacity_step));
pa->capacity += pa->capacity_step;
}
if (array_index < 0 || array_index >= pa->len) {
pa->pdata[pa->len] = data;
} else {
memmove(&pa->pdata[array_index+1], &pa->pdata[array_index], (pa->len-array_index) * sizeof(void*));
pa->pdata[array_index] = data;
}
pa->len++;
}
void ptr_array_add(ptrarray_t *pa, void *data)
{
ptr_array_insert(pa, data, -1);
}
void ptr_array_remove(ptrarray_t *pa, long array_index)
{
if (!pa || !pa->pdata || array_index < 0) return;
if (pa->len == 0 || array_index >= pa->len) return;
if (pa->len == 1) {
pa->pdata[0] = NULL;
} else {
memmove(&pa->pdata[array_index], &pa->pdata[array_index+1], (pa->len-array_index-1) * sizeof(void*));
}
pa->len--;
}
void ptr_array_set(ptrarray_t *pa, void *data, long array_index)
{
if (!pa || !pa->pdata || array_index < 0) return;
if (pa->len == 0 || array_index >= pa->len) return;
pa->pdata[array_index] = data;
}
void* ptr_array_index(ptrarray_t *pa, long array_index)
{
if (!pa) return NULL;
if (array_index < 0 || array_index >= pa->len) {
return NULL;
}
return pa->pdata[array_index];
}
long ptr_array_size(ptrarray_t *pa)
{
return pa->len;
}
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