memory_utils.c File Reference

#include "memory_utils.h"
#include "cbor/common.h"

Go to the source code of this file.

Functions
size_t	_cbor_highest_bit (size_t number)
	Highest on bit position.
bool	_cbor_safe_to_multiply (size_t a, size_t b)
	Can a and b be multiplied without overflowing size_t?
bool	_cbor_safe_to_add (size_t a, size_t b)
	Can a and b be added without overflowing size_t?
size_t	_cbor_safe_signaling_add (size_t a, size_t b)
	Adds a and b, propagating zeros and returning 0 on overflow.
void *	_cbor_alloc_multiple (size_t item_size, size_t item_count)
	Overflow-proof contiguous array allocation.
void *	_cbor_realloc_multiple (void *pointer, size_t item_size, size_t item_count)
	Overflow-proof contiguous array reallocation.

Function Documentation

_cbor_alloc_multiple()

void * _cbor_alloc_multiple	(	size_t	item_size,
		size_t	item_count )

Overflow-proof contiguous array allocation.

Parameters

item_size
item_count

Returns

Region of item_size * item_count bytes, or NULL if the total size overflows size_t or the underlying allocator failed

Definition at line 42 of file memory_utils.c.

_cbor_highest_bit()

size_t _cbor_highest_bit

(

size_t

number

)

Highest on bit position.

Definition at line 15 of file memory_utils.c.

_cbor_realloc_multiple()

void * _cbor_realloc_multiple	(	void *	pointer,
		size_t	item_size,
		size_t	item_count )

Overflow-proof contiguous array reallocation.

This implements the OpenBSD reallocarray functionality.

Parameters

pointer
item_size
item_count

Returns

Realloc'd of item_size * item_count bytes, or NULL if the total size overflows size_t or the underlying allocator failed

Definition at line 50 of file memory_utils.c.

_cbor_safe_signaling_add()

size_t _cbor_safe_signaling_add	(	size_t	a,
		size_t	b )

Adds a and b, propagating zeros and returning 0 on overflow.

Definition at line 36 of file memory_utils.c.

_cbor_safe_to_add()

bool _cbor_safe_to_add	(	size_t	a,
		size_t	b )

Can a and b be added without overflowing size_t?

Definition at line 30 of file memory_utils.c.

_cbor_safe_to_multiply()

bool _cbor_safe_to_multiply	(	size_t	a,
		size_t	b )

Can a and b be multiplied without overflowing size_t?

Definition at line 25 of file memory_utils.c.