1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_integer_h__
#define INCLUDE_integer_h__
/** @return true if p fits into the range of a size_t */
GIT_INLINE(int) git__is_sizet(int64_t p)
{
size_t r = (size_t)p;
return p == (int64_t)r;
}
/** @return true if p fits into the range of an ssize_t */
GIT_INLINE(int) git__is_ssizet(size_t p)
{
ssize_t r = (ssize_t)p;
return p == (size_t)r;
}
/** @return true if p fits into the range of a uint16_t */
GIT_INLINE(int) git__is_uint16(size_t p)
{
uint16_t r = (uint16_t)p;
return p == (size_t)r;
}
/** @return true if p fits into the range of a uint32_t */
GIT_INLINE(int) git__is_uint32(size_t p)
{
uint32_t r = (uint32_t)p;
return p == (size_t)r;
}
/** @return true if p fits into the range of an unsigned long */
GIT_INLINE(int) git__is_ulong(int64_t p)
{
unsigned long r = (unsigned long)p;
return p == (int64_t)r;
}
/** @return true if p fits into the range of an int */
GIT_INLINE(int) git__is_int(long long p)
{
int r = (int)p;
return p == (long long)r;
}
/* Use clang/gcc compiler intrinsics whenever possible */
#if (__has_builtin(__builtin_add_overflow) || \
(defined(__GNUC__) && (__GNUC__ >= 5)))
# if (SIZE_MAX == UINT_MAX)
# define git__add_sizet_overflow(out, one, two) \
__builtin_uadd_overflow(one, two, out)
# define git__multiply_sizet_overflow(out, one, two) \
__builtin_umul_overflow(one, two, out)
# elif (SIZE_MAX == ULONG_MAX)
# define git__add_sizet_overflow(out, one, two) \
__builtin_uaddl_overflow(one, two, out)
# define git__multiply_sizet_overflow(out, one, two) \
__builtin_umull_overflow(one, two, out)
# elif (SIZE_MAX == ULLONG_MAX)
# define git__add_sizet_overflow(out, one, two) \
__builtin_uaddll_overflow(one, two, out)
# define git__multiply_sizet_overflow(out, one, two) \
__builtin_umulll_overflow(one, two, out)
# else
# error compiler has add with overflow intrinsics but SIZE_MAX is unknown
# endif
# define git__add_int_overflow(out, one, two) \
__builtin_sadd_overflow(one, two, out)
# define git__sub_int_overflow(out, one, two) \
__builtin_ssub_overflow(one, two, out)
/* Use Microsoft's safe integer handling functions where available */
#elif defined(_MSC_VER)
# define ENABLE_INTSAFE_SIGNED_FUNCTIONS
# include <intsafe.h>
# define git__add_sizet_overflow(out, one, two) \
(SizeTAdd(one, two, out) != S_OK)
# define git__multiply_sizet_overflow(out, one, two) \
(SizeTMult(one, two, out) != S_OK)
#define git__add_int_overflow(out, one, two) \
(IntAdd(one, two, out) != S_OK)
#define git__sub_int_overflow(out, one, two) \
(IntSub(one, two, out) != S_OK)
#else
/**
* Sets `one + two` into `out`, unless the arithmetic would overflow.
* @return false if the result fits in a `size_t`, true on overflow.
*/
GIT_INLINE(bool) git__add_sizet_overflow(size_t *out, size_t one, size_t two)
{
if (SIZE_MAX - one < two)
return true;
*out = one + two;
return false;
}
/**
* Sets `one * two` into `out`, unless the arithmetic would overflow.
* @return false if the result fits in a `size_t`, true on overflow.
*/
GIT_INLINE(bool) git__multiply_sizet_overflow(size_t *out, size_t one, size_t two)
{
if (one && SIZE_MAX / one < two)
return true;
*out = one * two;
return false;
}
GIT_INLINE(bool) git__add_int_overflow(int *out, int one, int two)
{
if ((two > 0 && one > (INT_MAX - two)) ||
(two < 0 && one < (INT_MIN - two)))
return true;
*out = one + two;
return false;
}
GIT_INLINE(bool) git__sub_int_overflow(int *out, int one, int two)
{
if ((two > 0 && one < (INT_MIN + two)) ||
(two < 0 && one > (INT_MAX + two)))
return true;
*out = one - two;
return false;
}
#endif
#endif
|
