/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* Cairo - a vector graphics library with display and print output
*
* Copyright © 2007 Mozilla Corporation
*
* This library is free software ; you can redistribute it and / or
* modify it either under the terms of the GNU Lesser General Public
* License version 2 . 1 as published by the Free Software Foundation
* ( the " LGPL " ) or , at your option , under the terms of the Mozilla
* Public License Version 1 . 1 ( the " MPL " ) . If you do not alter this
* notice , a recipient may use your version of this file under either
* the MPL or the LGPL .
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING - LGPL - 2 . 1 ; if not , write to the Free Software
* Foundation , Inc . , 51 Franklin Street , Suite 500 , Boston , MA 02110 - 1335 , USA
* You should have received a copy of the MPL along with this library
* in the file COPYING - MPL - 1 . 1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1 . 1 ( the " License " ) ; you may not use this file except in
* compliance with the License . You may obtain a copy of the License at
* http : //www.mozilla.org/MPL/
*
* This software is distributed on an " AS IS " basis , WITHOUT WARRANTY
* OF ANY KIND , either express or implied . See the LGPL or the MPL for
* the specific language governing rights and limitations .
*
* The Original Code is the cairo graphics library .
*
* The Initial Developer of the Original Code is Mozilla Foundation
*
* Contributor ( s ) :
* Vladimir Vukicevic < vladimir @ pobox . com >
*/
#ifndef CAIRO_MALLOC_PRIVATE_H
#define CAIRO_MALLOC_PRIVATE_H
#include "cairo-wideint-private.h"
#include <stdlib.h>
#if HAVE_MEMFAULT
#include <memfault.h>
#define CAIRO_INJECT_FAULT() MEMFAULT_INJECT_FAULT()
#else
#define CAIRO_INJECT_FAULT() 0
#endif
/**
* _ cairo_malloc :
* @ size : size in bytes
*
* Allocate @ size memory using malloc ( ) .
* The memory should be freed using free ( ) .
* malloc is skipped , if 0 bytes are requested , and % NULL will be returned .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of malloc ( ) failure or size is 0 .
**/
#define _cairo_malloc(size) \
((size) != 0 ? malloc(size) : NULL)
/**
* _ cairo_calloc :
* @ size : size of each element
*
* Allocates @ size memory using calloc ( ) . Behaves much like
* calloc ( ) , except that only one parameter is required .
* The memory should be freed using free ( ) .
* calloc is skipped , if 0 bytes are requested , and % NULL will be returned .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of calloc ( ) failure or overflow .
**/
#define _cairo_calloc(size) \
((size) != 0 ? calloc(1 ,size) : NULL)
/**
* _ cairo_malloc_ab :
* @ a : number of elements to allocate
* @ size : size of each element
*
* Allocates @ a * @ size memory using _ cairo_malloc ( ) , taking care to not
* overflow when doing the multiplication . Behaves much like
* calloc ( ) , except that the returned memory is not set to zero .
* The memory should be freed using free ( ) .
*
* @ size should be a constant so that the compiler can optimize
* out a constant division .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of malloc ( ) failure or overflow .
**/
static cairo_always_inline void *
_cairo_malloc_ab(size_t a, size_t size)
{
size_t c;
if (_cairo_mul_size_t_overflow (a, size, &c))
return NULL;
return _cairo_malloc(c);
}
/**
* _ cairo_calloc_ab :
* @ a : number of elements to allocate
* @ size : size of each element
*
* Allocates @ a * @ size memory using _ cairo_calloc ( ) , taking care to not
* overflow when doing the multiplication .
*
* @ size should be a constant so that the compiler can optimize
* out a constant division .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of calloc ( ) failure or overflow .
**/
static cairo_always_inline void *
_cairo_calloc_ab(size_t a, size_t size)
{
size_t c;
if (_cairo_mul_size_t_overflow (a, size, &c))
return NULL;
return _cairo_calloc(c);
}
/**
* _ cairo_realloc_ab :
* @ ptr : original pointer to block of memory to be resized
* @ a : number of elements to allocate
* @ size : size of each element
*
* Reallocates @ ptr a block of @ a * @ size memory using realloc ( ) , taking
* care to not overflow when doing the multiplication . The memory
* should be freed using free ( ) .
*
* @ size should be a constant so that the compiler can optimize
* out a constant division .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of realloc ( ) failure or overflow ( whereupon the original block
* of memory * is left untouched ) .
**/
static cairo_always_inline void *
_cairo_realloc_ab(void *ptr, size_t a, size_t size)
{
size_t c;
if (_cairo_mul_size_t_overflow (a, size, &c))
return NULL;
return realloc(ptr, c);
}
/**
* _ cairo_malloc_abc :
* @ a : first factor of number of elements to allocate
* @ b : second factor of number of elements to allocate
* @ size : size of each element
*
* Allocates @ a * @ b * @ size memory using _ cairo_malloc ( ) , taking care to not
* overflow when doing the multiplication . Behaves like
* _ cairo_malloc_ab ( ) . The memory should be freed using free ( ) .
*
* @ size should be a constant so that the compiler can optimize
* out a constant division .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of malloc ( ) failure or overflow .
**/
static cairo_always_inline void *
_cairo_malloc_abc(size_t a, size_t b, size_t size)
{
size_t c, d;
if (_cairo_mul_size_t_overflow (a, b, &c))
return NULL;
if (_cairo_mul_size_t_overflow (c, size, &d))
return NULL;
return _cairo_malloc(d);
}
/**
* _ cairo_malloc_ab_plus_c :
* @ a : number of elements to allocate
* @ size : size of each element
* @ c : additional size to allocate
*
* Allocates @ a * @ size + @ c memory using _ cairo_malloc ( ) , taking care to not
* overflow when doing the arithmetic . Behaves similar to
* _ cairo_malloc_ab ( ) . The memory should be freed using free ( ) .
*
* Return value : A pointer to the newly allocated memory , or % NULL in
* case of malloc ( ) failure or overflow .
**/
static cairo_always_inline void *
_cairo_malloc_ab_plus_c(size_t a, size_t size, size_t c)
{
size_t d, e;
if (_cairo_mul_size_t_overflow (a, size, &d))
return NULL;
if (_cairo_add_size_t_overflow (d, c, &e))
return NULL;
return _cairo_malloc(e);
}
#endif /* CAIRO_MALLOC_PRIVATE_H */
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