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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_array_h__
#define INCLUDE_array_h__
#include "util.h"
/*
* Use this to declare a typesafe resizable array of items, a la:
*
* git_array_t(int) my_ints = GIT_ARRAY_INIT;
* ...
* int *i = git_array_alloc(my_ints);
* GITERR_CHECK_ALLOC(i);
* ...
* git_array_clear(my_ints);
*
* You may also want to do things like:
*
* typedef git_array_t(my_struct) my_struct_array_t;
*/
#define git_array_t(type) struct { type *ptr; uint32_t size, asize; }
#define GIT_ARRAY_INIT { NULL, 0, 0 }
#define git_array_init(a) \
do { (a).size = (a).asize = 0; (a).ptr = NULL; } while (0)
#define git_array_init_to_size(a, desired) \
do { (a).size = 0; (a).asize = desired; (a).ptr = git__calloc(desired, sizeof(*(a).ptr)); } while (0)
#define git_array_clear(a) \
do { git__free((a).ptr); git_array_init(a); } while (0)
#define GITERR_CHECK_ARRAY(a) GITERR_CHECK_ALLOC((a).ptr)
typedef git_array_t(char) git_array_generic_t;
/* use a generic array for growth so this can return the new item */
GIT_INLINE(void *) git_array_grow(void *_a, size_t item_size)
{
git_array_generic_t *a = _a;
uint32_t new_size = (a->size < 8) ? 8 : a->asize * 3 / 2;
char *new_array = git__realloc(a->ptr, new_size * item_size);
if (!new_array) {
git_array_clear(*a);
return NULL;
} else {
a->ptr = new_array; a->asize = new_size; a->size++;
return a->ptr + (a->size - 1) * item_size;
}
}
#define git_array_alloc(a) \
(((a).size >= (a).asize) ? \
git_array_grow(&(a), sizeof(*(a).ptr)) : \
((a).ptr ? &(a).ptr[(a).size++] : NULL))
#define git_array_last(a) ((a).size ? &(a).ptr[(a).size - 1] : NULL)
#define git_array_pop(a) ((a).size ? &(a).ptr[--(a).size] : NULL)
#define git_array_get(a, i) (((i) < (a).size) ? &(a).ptr[(i)] : NULL)
#define git_array_size(a) (a).size
#define git_array_valid_index(a, i) ((i) < (a).size)
#endif
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