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apk-tools/src/common.c

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all: rework how arrays work Instead of having a null pointer, use a dummy array which just says the array is empty. This helps in multiple places of the code which would otherwise need explicitly need to check first if the array exists. This has been cause of multiple seg.faults in the past as the array check is easily omitted. This also removes (or fixes) all existing checks accordingly.
2010-06-05 09:06:41 +00:00
/* common.c - Alpine Package Keeper (APK)
*
all: update copyright year statement
2011-09-13 08:53:01 +00:00
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
all: rework how arrays work Instead of having a null pointer, use a dummy array which just says the array is empty. This helps in multiple places of the code which would otherwise need explicitly need to check first if the array exists. This has been cause of multiple seg.faults in the past as the array check is easily omitted. This also removes (or fixes) all existing checks accordingly.
2010-06-05 09:06:41 +00:00
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <malloc.h>
#include <string.h>
#include "apk_defines.h"
static int *dummy_array = 0;
void *apk_array_resize(void *array, size_t new_size, size_t elem_size)
{
int old_size, diff;
void *tmp;
if (new_size == 0) {
if (array != &dummy_array)
free(array);
return &dummy_array;
}
old_size = array ? *((int*) array) : 0;
diff = new_size - old_size;
if (array == &dummy_array)
array = NULL;
tmp = realloc(array, sizeof(int) + new_size * elem_size);
if (diff > 0)
memset(tmp + sizeof(int) + old_size * elem_size, 0,
diff * elem_size);
*((int*) tmp) = new_size;
return tmp;
}