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binutils.c
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binutils.c
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// binutils.c
// hosts2zones
//
// Created by Dr. Rolf Jansen on 2016-08-13.
// Copyright (c) 2016 projectworld.net. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <syslog.h>
#include "binutils.h"
#pragma mark ••• Fencing Memory Allocation Wrappers •••
ssize_t gAllocationTotal = 0;
static inline void countAllocation(ssize_t size)
{
if (__sync_add_and_fetch(&gAllocationTotal, size) < 0)
{
syslog(LOG_ERR, "Corruption of allocated memory detected by countAllocation().");
exit(EXIT_FAILURE);
}
}
void *allocate(ssize_t size, bool cleanout)
{
if (size >= 0)
{
allocation *a;
if (cleanout)
{
if ((a = calloc(1, allocationMetaSize + size + sizeof(size_t))) == NULL)
return NULL;
}
else
{
if ((a = malloc(allocationMetaSize + size + sizeof(size_t))) == NULL)
return NULL;
*(size_t *)((void *)a + allocationMetaSize + size) = 0; // place a (size_t)0 just above the payload as the upper boundary of the allocation
}
countAllocation(size);
a->size = size;
a->check = size | (size_t)a;
return &a->payload;
}
else
return NULL;
}
void *reallocate(void *p, ssize_t size, bool cleanout, bool free_on_error)
{
if (size >= 0)
if (p)
{
allocation *a = p - allocationMetaSize;
if (a->check == (a->size | (size_t)a) && *(ssize_t *)((void *)a + allocationMetaSize + a->size) == 0)
a->check = 0;
else
{
syslog(LOG_ERR, "Corruption of allocated memory detected by reallocate().");
exit(EXIT_FAILURE);
}
if ((p = realloc(a, allocationMetaSize + size + sizeof(size_t))) == NULL)
{
if (free_on_error)
{
countAllocation(-a->size);
free(a);
}
return NULL;
}
else
a = p;
if (cleanout)
bzero((void *)a + allocationMetaSize + a->size, size - a->size + sizeof(size_t));
else
*(ssize_t *)((void *)a + allocationMetaSize + size) = 0; // place a (size_t)0 just above the payload as the upper boundary of the allocation
countAllocation(size - a->size);
a->size = size;
a->check = size | (size_t)a;
return &a->payload;
}
else
return allocate(size, cleanout);
return NULL;
}
void deallocate(void **p, bool cleanout)
{
if (p && *p)
{
allocation *a = *p - allocationMetaSize;
*p = NULL;
if (a->check == (a->size | (size_t)a) && *(ssize_t *)((void *)a + allocationMetaSize + a->size) == 0)
a->check = 0;
else
{
syslog(LOG_ERR, "Corruption of allocated memory detected by deallocate().");
exit(EXIT_FAILURE);
}
countAllocation(-a->size);
if (cleanout)
bzero((void *)a, allocationMetaSize + a->size + sizeof(size_t));
free(a);
}
}
void deallocate_batch(unsigned cleanout, ...)
{
void **p;
va_list vl;
va_start(vl, cleanout);
while (p = va_arg(vl, void **))
if (*p)
{
allocation *a = *p - allocationMetaSize;
*p = NULL;
if (a->check == (a->size | (size_t)a) && *(ssize_t *)((void *)a + allocationMetaSize + a->size) == 0)
a->check = 0;
else
{
syslog(LOG_ERR, "Corruption of allocated memory detected by deallocate_batch().");
exit(EXIT_FAILURE);
}
countAllocation(-a->size);
if (cleanout)
bzero((void *)a, allocationMetaSize + a->size + sizeof(size_t));
free(a);
}
va_end(vl);
}