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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-memory.c D-BUS memory handling
*
* Copyright (C) 2002, 2003 Red Hat Inc.
*
* Licensed under the Academic Free License version 1.2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "dbus-memory.h"
#include "dbus-internals.h"
#include <stdlib.h>
/**
* @defgroup DBusMemory Memory Allocation
* @ingroup DBus
* @brief dbus_malloc(), dbus_free(), etc.
*
* Functions and macros related to allocating and releasing
* blocks of memory.
*
* @{
*/
/**
* @def dbus_new
*
* Safe macro for using dbus_malloc(). Accepts the type
* to allocate and the number of type instances to
* allocate as arguments, and returns a memory block
* cast to the desired type, instead of as a void*.
*
* @param type type name to allocate
* @param count number of instances in the allocated array
* @returns the new memory block or #NULL on failure
*/
/**
* @def dbus_new0
*
* Safe macro for using dbus_malloc0(). Accepts the type
* to allocate and the number of type instances to
* allocate as arguments, and returns a memory block
* cast to the desired type, instead of as a void*.
* The allocated array is initialized to all-bits-zero.
*
* @param type type name to allocate
* @param count number of instances in the allocated array
* @returns the new memory block or #NULL on failure
*/
/**
* @typedef DBusFreeFunction
*
* The type of a function which frees a block of memory.
*
* @param memory the memory to free
*/
#ifdef DBUS_BUILD_TESTS
static dbus_bool_t inited = FALSE;
static int fail_counts = -1;
static size_t fail_size = 0;
#endif
#ifdef DBUS_BUILD_TESTS
static void
initialize_malloc_debug (void)
{
if (!inited)
{
if (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH") != NULL)
{
fail_counts = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_NTH"));
_dbus_set_fail_alloc_counter (fail_counts);
}
if (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN") != NULL)
fail_size = atoi (_dbus_getenv ("DBUS_MALLOC_FAIL_GREATER_THAN"));
inited = TRUE;
}
}
#endif
/**
* Allocates the given number of bytes, as with standard
* malloc(). Guaranteed to return #NULL if bytes is zero
* on all platforms. Returns #NULL if the allocation fails.
* The memory must be released with dbus_free().
*
* @param bytes number of bytes to allocate
* @return allocated memory, or #NULL if the allocation fails.
*/
void*
dbus_malloc (size_t bytes)
{
#ifdef DBUS_BUILD_TESTS
initialize_malloc_debug ();
if (_dbus_decrement_fail_alloc_counter ())
{
if (fail_counts != -1)
_dbus_set_fail_alloc_counter (fail_counts);
return NULL;
}
#endif
if (bytes == 0) /* some system mallocs handle this, some don't */
return NULL;
#if DBUS_BUILD_TESTS
else if (fail_size != 0 && bytes > fail_size)
return NULL;
#endif
else
return malloc (bytes);
}
/**
* Allocates the given number of bytes, as with standard malloc(), but
* all bytes are initialized to zero as with calloc(). Guaranteed to
* return #NULL if bytes is zero on all platforms. Returns #NULL if the
* allocation fails. The memory must be released with dbus_free().
*
* @param bytes number of bytes to allocate
* @return allocated memory, or #NULL if the allocation fails.
*/
void*
dbus_malloc0 (size_t bytes)
{
#ifdef DBUS_BUILD_TESTS
initialize_malloc_debug ();
if (_dbus_decrement_fail_alloc_counter ())
{
if (fail_counts != -1)
_dbus_set_fail_alloc_counter (fail_counts);
return NULL;
}
#endif
if (bytes == 0)
return NULL;
#if DBUS_BUILD_TESTS
else if (fail_size != 0 && bytes > fail_size)
return NULL;
#endif
else
return calloc (bytes, 1);
}
/**
* Resizes a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). Guaranteed to free the memory and return #NULL if bytes
* is zero on all platforms. Returns #NULL if the resize fails.
* If the resize fails, the memory is not freed.
*
* @param memory block to be resized
* @param bytes new size of the memory block
* @return allocated memory, or #NULL if the resize fails.
*/
void*
dbus_realloc (void *memory,
size_t bytes)
{
#ifdef DBUS_BUILD_TESTS
initialize_malloc_debug ();
if (_dbus_decrement_fail_alloc_counter ())
{
if (fail_counts != -1)
_dbus_set_fail_alloc_counter (fail_counts);
return NULL;
}
#endif
if (bytes == 0) /* guarantee this is safe */
{
dbus_free (memory);
return NULL;
}
#if DBUS_BUILD_TESTS
else if (fail_size != 0 && bytes > fail_size)
return NULL;
#endif
else
{
return realloc (memory, bytes);
}
}
/**
* Frees a block of memory previously allocated by dbus_malloc() or
* dbus_malloc0(). If passed #NULL, does nothing.
*
* @param memory block to be freed
*/
void
dbus_free (void *memory)
{
if (memory) /* we guarantee it's safe to free (NULL) */
free (memory);
}
/** @} */
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