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https://gitlab.freedesktop.org/cairo/cairo.git
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67099a091e
This should allow to use them for allocating large amounts of memory. Also use explicit checks for zeros to not make the compiler think that it is a boolean context.
149 lines
5.2 KiB
C
149 lines
5.2 KiB
C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
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/* Cairo - a vector graphics library with display and print output
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*
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* Copyright © 2007 Mozilla Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com>
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*/
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#ifndef CAIRO_MALLOC_PRIVATE_H
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#define CAIRO_MALLOC_PRIVATE_H
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#include "cairo-wideint-private.h"
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#include <stdlib.h>
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#if HAVE_MEMFAULT
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#include <memfault.h>
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#define CAIRO_INJECT_FAULT() MEMFAULT_INJECT_FAULT()
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#else
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#define CAIRO_INJECT_FAULT() 0
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#endif
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/**
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* _cairo_malloc:
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* @size: size in bytes
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*
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* Allocate @size memory using malloc().
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* The memory should be freed using free().
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* malloc is skipped, if 0 bytes are requested, and %NULL will be returned.
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*
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* Return value: A pointer to the newly allocated memory, or %NULL in
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* case of malloc() failure or size is 0.
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**/
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#define _cairo_malloc(size) \
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((size) != 0 ? malloc(size) : NULL)
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/**
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* _cairo_malloc_ab:
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* @a: number of elements to allocate
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* @size: size of each element
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*
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* Allocates @a*@size memory using _cairo_malloc(), taking care to not
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* overflow when doing the multiplication. Behaves much like
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* calloc(), except that the returned memory is not set to zero.
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* The memory should be freed using free().
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*
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* @size should be a constant so that the compiler can optimize
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* out a constant division.
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*
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* Return value: A pointer to the newly allocated memory, or %NULL in
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* case of malloc() failure or overflow.
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**/
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#define _cairo_malloc_ab(a, size) \
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((size) != 0 && (size_t) (a) >= SIZE_MAX / (size_t) (size) ? NULL : \
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_cairo_malloc((size_t) (a) * (size_t) (size)))
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/**
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* _cairo_realloc_ab:
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* @ptr: original pointer to block of memory to be resized
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* @a: number of elements to allocate
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* @size: size of each element
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*
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* Reallocates @ptr a block of @a*@size memory using realloc(), taking
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* care to not overflow when doing the multiplication. The memory
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* should be freed using free().
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*
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* @size should be a constant so that the compiler can optimize
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* out a constant division.
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*
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* Return value: A pointer to the newly allocated memory, or %NULL in
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* case of realloc() failure or overflow (whereupon the original block
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* of memory * is left untouched).
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**/
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#define _cairo_realloc_ab(ptr, a, size) \
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((size) != 0 && (size_t) (a) >= SIZE_MAX / (size_t) (size) ? NULL : \
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realloc(ptr, (size_t) (a) * (size_t) (size)))
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/**
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* _cairo_malloc_abc:
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* @a: first factor of number of elements to allocate
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* @b: second factor of number of elements to allocate
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* @size: size of each element
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*
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* Allocates @a*@b*@size memory using _cairo_malloc(), taking care to not
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* overflow when doing the multiplication. Behaves like
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* _cairo_malloc_ab(). The memory should be freed using free().
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*
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* @size should be a constant so that the compiler can optimize
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* out a constant division.
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*
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* Return value: A pointer to the newly allocated memory, or %NULL in
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* case of malloc() failure or overflow.
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**/
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#define _cairo_malloc_abc(a, b, size) \
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((b) != 0 && (size_t) (a) >= SIZE_MAX / (size_t) (b) ? NULL : \
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(size) != 0 && (size_t) ((a)*(b)) >= SIZE_MAX / (size_t) (size) ? NULL : \
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_cairo_malloc((size_t) (a) * (size_t) (b) * (size_t) (size)))
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/**
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* _cairo_malloc_ab_plus_c:
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* @a: number of elements to allocate
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* @size: size of each element
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* @c: additional size to allocate
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*
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* Allocates @a*@size+@c memory using _cairo_malloc(), taking care to not
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* overflow when doing the arithmetic. Behaves similar to
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* _cairo_malloc_ab(). The memory should be freed using free().
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*
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* Return value: A pointer to the newly allocated memory, or %NULL in
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* case of malloc() failure or overflow.
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**/
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#define _cairo_malloc_ab_plus_c(a, size, c) \
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((size) != 0 && (size_t) (a) >= SIZE_MAX / (size_t) (size) ? NULL : \
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(size_t) (c) >= SIZE_MAX - (size_t) (a) * (size_t) (size) ? NULL : \
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_cairo_malloc((size_t) (a) * (size_t) (size) + (size_t) (c)))
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#endif /* CAIRO_MALLOC_PRIVATE_H */
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