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/*
* 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(git_off_t p)
{
size_t r = (size_t)p;
return p == (git_off_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 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(git_off_t p)
{
unsigned long r = (unsigned long)p;
return p == (git_off_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
/* Use Microsoft's safe integer handling functions where available */
#elif defined(_MSC_VER)
# 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)
#else
/**
* Sets `one + two` into `out`, unless the arithmetic would overflow.
* @return true if the result fits in a `size_t`, false 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 true if the result fits in a `size_t`, false 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;
}
#endif
#endif
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