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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension 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 program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* Simple generalized arrays, for returning variable-length arrays from
* functions, and other fun stuff. All functions are inline for performance
* reasons.
*/
#ifndef DIMENSION_ARRAY_H
#define DIMENSION_ARRAY_H
#include <stdlib.h> /* For size_t */
#include <string.h> /* For memcpy */
typedef struct {
void *ptr;
size_t obj_size, length, capacity;
} dmnsn_array;
/* Delete an array */
DMNSN_INLINE void
dmnsn_delete_array(dmnsn_array *array)
{
if (array) {
free(array->ptr);
free(array);
}
}
/* Array allocation */
DMNSN_INLINE dmnsn_array *
dmnsn_new_array(size_t obj_size)
{
dmnsn_array *array = (dmnsn_array *)dmnsn_malloc(sizeof(dmnsn_array));
array->obj_size = obj_size;
array->length = 0;
array->capacity = 4; /* Start with capacity of 4 */
/* Allocate the memory */
array->ptr = dmnsn_malloc(array->capacity*array->obj_size);
return array;
}
/* Get the size of the array */
DMNSN_INLINE size_t
dmnsn_array_size(const dmnsn_array *array)
{
return array->length;
}
/* Set the size of the array */
DMNSN_INLINE void
dmnsn_array_resize(dmnsn_array *array, size_t length)
{
if (length > array->capacity) {
/* Resize if we don't have enough capacity */
array->capacity = length*2; /* We are greedy */
array->ptr = dmnsn_realloc(array->ptr, array->obj_size*array->capacity);
}
array->length = length;
}
/* Get the i'th object, bailing out if i is out of range */
DMNSN_INLINE void
dmnsn_array_get(const dmnsn_array *array, size_t i, void *obj)
{
dmnsn_assert(i < dmnsn_array_size(array), "Array index out of bounds.");
memcpy(obj, (char *)array->ptr + array->obj_size*i, array->obj_size);
}
/* Set the i'th object, expanding the array if necessary */
DMNSN_INLINE void
dmnsn_array_set(dmnsn_array *array, size_t i, const void *obj)
{
if (i >= dmnsn_array_size(array)) {
/* Resize if i is out of range */
dmnsn_array_resize(array, i + 1);
}
memcpy((char *)array->ptr + array->obj_size*i, obj, array->obj_size);
}
/* First element */
DMNSN_INLINE void *
dmnsn_array_first(const dmnsn_array *array)
{
return array->ptr;
}
/* Last element */
DMNSN_INLINE void *
dmnsn_array_last(const dmnsn_array *array)
{
return (char *)array->ptr + array->obj_size*(array->length - 1);
}
/* Arbitrary element access */
DMNSN_INLINE void *
dmnsn_array_at(const dmnsn_array *array, size_t i)
{
dmnsn_assert(i < dmnsn_array_size(array), "Array index out of bounds.");
return (char *)array->ptr + array->obj_size*i;
}
/* Push obj to the end of the array */
DMNSN_INLINE void
dmnsn_array_push(dmnsn_array *array, const void *obj)
{
dmnsn_array_set(array, dmnsn_array_size(array), obj);
}
/* Pop obj from the end of the array */
DMNSN_INLINE void
dmnsn_array_pop(dmnsn_array *array, void *obj)
{
size_t size = dmnsn_array_size(array);
dmnsn_assert(size > 0, "Array is empty.");
dmnsn_array_get(array, size - 1, obj); /* Copy the object */
dmnsn_array_resize(array, size - 1); /* Shrink the array */
}
/* Insert an item into the middle of the array */
DMNSN_INLINE void
dmnsn_array_insert(dmnsn_array *array, size_t i, const void *obj)
{
size_t size = dmnsn_array_size(array) + 1;
if (i >= size)
size = i + 1;
dmnsn_array_resize(array, size);
/* Move the elements at and after `i' 1 to the right */
memmove((char *)array->ptr + array->obj_size*(i + 1),
(char *)array->ptr + array->obj_size*i,
array->obj_size*(size - i - 1));
/* Insert `obj' at `i' */
memcpy((char *)array->ptr + array->obj_size*i, obj, array->obj_size);
}
/* Remove an item from the middle of the array */
DMNSN_INLINE void
dmnsn_array_remove(dmnsn_array *array, size_t i)
{
size_t size = dmnsn_array_size(array);
dmnsn_assert(i < size, "Array index out of bounds.");
/* Move the array elements after `i' 1 to the left */
memmove((char *)array->ptr + array->obj_size*i,
(char *)array->ptr + array->obj_size*(i + 1),
array->obj_size*(size - i - 1));
/* Decrease the size by 1 */
dmnsn_array_resize(array, size - 1);
}
/* Macro to shorten array iteration */
#define DMNSN_ARRAY_FOREACH(type, i, array) \
for (type i = dmnsn_array_first(array); \
i <= (type)dmnsn_array_last(array); \
++i)
#endif /* DIMENSION_ARRAY_H */
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