1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef __SHARE_ALLOC_H_
18#define __SHARE_ALLOC_H_
19
20#include <limits.h>
21
22// malloc(n floor 1)
23static inline void *safe_malloc_(size_t n)
24{
25    // dlmalloc is already safe
26    return malloc(n);
27}
28
29// malloc(n1 * n2) then memset to zero
30static inline void *safe_calloc_(size_t n1, size_t n2)
31{
32    // dlcalloc is already safe
33    return calloc(n1, n2);
34}
35
36// malloc(n1 + n2)
37static inline void *safe_malloc_add_2op_(size_t n1, size_t n2)
38{
39    unsigned long long n = n1 + n2;
40    size_t ns = n;
41    // check for overflow
42    return n == ns ? malloc(ns) : NULL;
43}
44
45// malloc(n1 * n2)
46static inline void *safe_malloc_mul_2op_(size_t n1, size_t n2)
47{
48    unsigned long long n = n1 * n2;
49    size_t ns = n;
50    // check for overflow
51    return n == ns ? malloc(ns) : NULL;
52}
53
54// malloc(n1 * (n2 + n3))
55static inline void *safe_malloc_muladd2_(size_t n1, size_t n2, size_t n3)
56{
57    unsigned long long n = n1 * (n2 + n3);
58    size_t ns = n;
59    // check for overflow
60    return n == ns ? malloc(ns) : NULL;
61}
62
63// realloc(ptr, n1 * n2)
64static inline void *safe_realloc_mul_2op_(void *ptr, size_t n1, size_t n2)
65{
66    unsigned long long n = n1 * n2;
67    size_t ns = n;
68    // check for overflow
69    return n == ns ? realloc(ptr, ns) : NULL;
70}
71
72#endif // __SHARE_ALLOC_H_
73