Python/asdl.c

#include "Python.h"
#include "asdl.h"

asdl_seq *
asdl_seq_new(int size, PyArena *arena)
{
	asdl_seq *seq = NULL;
	size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);

	/* check size is sane */
	if (size < 0 || size == INT_MIN || 
		(size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
		PyErr_NoMemory();
		return NULL;
	}

	/* check if size can be added safely */
	if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
		PyErr_NoMemory();
		return NULL;
	}

	n += sizeof(asdl_seq);

	seq = (asdl_seq *)PyArena_Malloc(arena, n);
	if (!seq) {
		PyErr_NoMemory();
		return NULL;
	}
	memset(seq, 0, n);
	seq->size = size;
	return seq;
}

asdl_int_seq *
asdl_int_seq_new(int size, PyArena *arena)
{
	asdl_int_seq *seq = NULL;
	size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);

	/* check size is sane */
	if (size < 0 || size == INT_MIN || 
		(size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
			PyErr_NoMemory();
			return NULL;
	}

	/* check if size can be added safely */
	if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
		PyErr_NoMemory();
		return NULL;
	}

	n += sizeof(asdl_seq);

	seq = (asdl_int_seq *)PyArena_Malloc(arena, n);
	if (!seq) {
		PyErr_NoMemory();
		return NULL;
	}
	memset(seq, 0, n);
	seq->size = size;
	return seq;
}