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reactos/sdk/lib/ucrt/convert/xtoa.cpp

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//
// _ctype.cpp
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Functions for converting integers to strings.
//
#include <corecrt_internal.h>
#include <corecrt_internal_securecrt.h>
#include <limits.h>
#include <stdlib.h>
#pragma warning(disable:__WARNING_NOT_SATISFIED) // 28020 Prefast thinks that 18446744073709551615 < 1.
#pragma warning(disable:__WARNING_RANGE_PRECONDITION_VIOLATION) // 26060 Prefast thinks that 18446744073709551615 < 1.
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Common Conversion Implementation
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
namespace
{
template <typename T> struct make_signed;
template <> struct make_signed<unsigned long> { typedef long type; };
template <> struct make_signed<unsigned __int64> { typedef __int64 type; };
}
template <typename UnsignedInteger, typename Character>
_Success_(return == 0)
static errno_t __cdecl common_xtox(
UnsignedInteger const original_value,
_Out_writes_z_(buffer_count) Character* const buffer,
_When_(is_negative == true, _In_range_(>=, 2)) _In_range_(>=, 1)
size_t const buffer_count,
unsigned const radix,
bool const is_negative
) throw()
{
// OACR isn't able to track that p stays within the bounds of [buffer, buffer + buffer_count) so manually verified and disabled warning
#pragma warning(push)
#pragma warning(disable:26014)
Character* p = buffer; // pointer to traverse the string
size_t length = 0; // current length of string
UnsignedInteger remaining_value = original_value;;
if (is_negative)
{
*p++ = '-';
++length;
remaining_value = static_cast<UnsignedInteger>(
-static_cast<typename make_signed<UnsignedInteger>::type>(remaining_value)
);
}
Character* first_digit = p;
do
{
unsigned const digit = static_cast<unsigned>(remaining_value % radix);
remaining_value /= radix;
// Convert to ASCII and store:
if (digit > 9)
{
*p++ = static_cast<Character>(digit - 10 + 'a');
}
else
{
*p++ = static_cast<Character>(digit + '0');
}
++length;
}
while (remaining_value > 0 && length < buffer_count);
if (length >= buffer_count)
{
buffer[0] = '\0';
_VALIDATE_RETURN_ERRCODE(length < buffer_count, ERANGE);
}
// We now have the digits of the number in the buffer, but in reverse order.
// Reverse the order, but first terminate the string:
*p-- = '\0';
do
{
Character const t = *p;
*p = *first_digit;
*first_digit = t;
--p;
++first_digit;
}
while (first_digit < p);
return 0;
#pragma warning(pop)
}
template <typename UnsignedInteger, typename Character>
_Success_(return == 0)
static errno_t __cdecl common_xtox_s(
UnsignedInteger const value,
_Out_writes_z_(buffer_count) Character* const buffer,
size_t const buffer_count,
unsigned const radix,
bool const is_negative
) throw()
{
_VALIDATE_RETURN_ERRCODE(buffer != nullptr, EINVAL);
_VALIDATE_RETURN_ERRCODE(buffer_count > 0, EINVAL);
_RESET_STRING(buffer, buffer_count);
_VALIDATE_RETURN_ERRCODE(buffer_count > static_cast<size_t>(is_negative ? 2 : 1), ERANGE);
_VALIDATE_RETURN_ERRCODE(2 <= radix && radix <= 36, EINVAL);
return common_xtox(value, buffer, buffer_count, radix, is_negative);
}
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// 32-bit Integers => Narrow Strings
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
extern "C" errno_t __cdecl _itoa_s(
int const value,
char* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned long>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ltoa_s(
long const value,
char* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned long>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ultoa_s(
unsigned long const value,
char* const buffer,
size_t const buffer_count,
int const radix
)
{
return common_xtox_s(value, buffer, buffer_count, radix, false);
}
extern "C" char* __cdecl _itoa(
int const value,
char* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned long>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" char* __cdecl _ltoa(
long const value,
char* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned long>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" char* __cdecl _ultoa(
unsigned long const value,
char* const buffer,
int const radix
)
{
common_xtox(value, buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, false);
return buffer;
}
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// 64-bit Integers => Narrow Strings
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
extern "C" errno_t __cdecl _i64toa_s(
__int64 const value,
char* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned __int64>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ui64toa_s(
unsigned __int64 const value,
char* const buffer,
size_t const buffer_count,
int const radix
)
{
return common_xtox_s(value, buffer, buffer_count, radix, false);
}
extern "C" char* __cdecl _i64toa(
__int64 const value,
char* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned __int64>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" char* __cdecl _ui64toa(
unsigned __int64 const value,
char* const buffer,
int const radix
)
{
common_xtox(value, buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, false);
return buffer;
}
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// 32-bit Integers => Wide Strings
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
extern "C" errno_t __cdecl _itow_s(
int const value,
wchar_t* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned long>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ltow_s(
long const value,
wchar_t* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned long>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ultow_s(
unsigned long const value,
wchar_t* const buffer,
size_t const buffer_count,
int const radix
)
{
return common_xtox_s(value, buffer, buffer_count, radix, false);
}
extern "C" wchar_t* __cdecl _itow(
int const value,
wchar_t* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned long>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" wchar_t* __cdecl _ltow(
long const value,
wchar_t* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned long>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" wchar_t* __cdecl _ultow(
unsigned long const value,
wchar_t* const buffer,
int const radix
)
{
common_xtox(value, buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, false);
return buffer;
}
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// 64-bit Integers => Wide Strings
//
//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
extern "C" errno_t __cdecl _i64tow_s(
__int64 const value,
wchar_t* const buffer,
size_t const buffer_count,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
return common_xtox_s(static_cast<unsigned __int64>(value), buffer, buffer_count, radix, is_negative);
}
extern "C" errno_t __cdecl _ui64tow_s(
unsigned __int64 const value,
wchar_t* const buffer,
size_t const buffer_count,
int const radix
)
{
return common_xtox_s(value, buffer, buffer_count, radix, false);
}
extern "C" wchar_t* __cdecl _i64tow(
__int64 const value,
wchar_t* const buffer,
int const radix
)
{
bool const is_negative = radix == 10 && value < 0;
common_xtox(static_cast<unsigned __int64>(value), buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, is_negative);
return buffer;
}
extern "C" wchar_t* __cdecl _ui64tow(
unsigned __int64 const value,
wchar_t* const buffer,
int const radix
)
{
common_xtox(value, buffer, _CRT_UNBOUNDED_BUFFER_SIZE, radix, false);
return buffer;
}
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