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/* $Id: array.h 2553 2011-07-09 09:42:33Z tcunha $ */

/*
* Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef ARRAY_H
#define ARRAY_H

#define ARRAY_INITIALIZER { NULL, 0, 0 }

#define ARRAY_DECL(n, c) \
struct n { \
c *list; \
u_int num; \
size_t space; \
}

#define ARRAY_ITEM(a, i) ((a)->list[i])
#define ARRAY_ITEMSIZE(a) (sizeof *(a)->list)
#define ARRAY_INITIALSPACE(a) (10 * ARRAY_ITEMSIZE(a))

#define ARRAY_ENSURE(a, n) do { \
if (UINT_MAX - (n) < (a)->num) \
fatalx("number too big"); \
if (SIZE_MAX / ((a)->num + (n)) < ARRAY_ITEMSIZE(a)) \
fatalx("size too big"); \
if ((a)->space == 0) { \
(a)->space = ARRAY_INITIALSPACE(a); \
(a)->list = xrealloc((a)->list, 1, (a)->space); \
} \
while ((a)->space <= ((a)->num + (n)) * ARRAY_ITEMSIZE(a)) { \
(a)->list = xrealloc((a)->list, 2, (a)->space); \
(a)->space *= 2; \
} \
} while (0)

#define ARRAY_EMPTY(a) (((void *) (a)) == NULL || (a)->num == 0)
#define ARRAY_LENGTH(a) ((a)->num)
#define ARRAY_DATA(a) ((a)->list)

#define ARRAY_FIRST(a) ARRAY_ITEM(a, 0)
#define ARRAY_LAST(a) ARRAY_ITEM(a, (a)->num - 1)

#define ARRAY_INIT(a) do { \
(a)->num = 0; \
(a)->list = NULL; \
(a)->space = 0; \
} while (0)
#define ARRAY_CLEAR(a) do { \
(a)->num = 0; \
} while (0)

#define ARRAY_SET(a, i, s) do { \
(a)->list[i] = s; \
} while (0)

#define ARRAY_ADD(a, s) do { \
ARRAY_ENSURE(a, 1); \
(a)->list[(a)->num] = s; \
(a)->num++; \
} while (0)
#define ARRAY_INSERT(a, i, s) do { \
ARRAY_ENSURE(a, 1); \
if ((i) < (a)->num) { \
memmove((a)->list + (i) + 1, (a)->list + (i), \
ARRAY_ITEMSIZE(a) * ((a)->num - (i))); \
} \
(a)->list[i] = s; \
(a)->num++; \
} while (0)
#define ARRAY_REMOVE(a, i) do { \
if ((i) < (a)->num - 1) { \
memmove((a)->list + (i), (a)->list + (i) + 1, \
ARRAY_ITEMSIZE(a) * ((a)->num - (i) - 1)); \
} \
(a)->num--; \
if ((a)->num == 0) \
ARRAY_FREE(a); \
} while (0)

#define ARRAY_EXPAND(a, n) do { \
ARRAY_ENSURE(a, n); \
(a)->num += n; \
} while (0)
#define ARRAY_TRUNC(a, n) do { \
if ((a)->num > n) \
(a)->num -= n; \
else \
ARRAY_FREE(a); \
} while (0)

#define ARRAY_CONCAT(a, b) do { \
ARRAY_ENSURE(a, (b)->num); \
memcpy((a)->list + (a)->num, (b)->list, (b)->num * ARRAY_ITEMSIZE(a)); \
(a)->num += (b)->num; \
} while (0)

#define ARRAY_FREE(a) do { \
if ((a)->list != NULL) \
xfree((a)->list); \
ARRAY_INIT(a); \
} while (0)
#define ARRAY_FREEALL(a) do { \
ARRAY_FREE(a); \
xfree(a); \
} while (0)

#endif
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