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Copy pathNumeric.cs
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1098 lines (926 loc) · 40.7 KB
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using System.Runtime.CompilerServices;
namespace System.Text.Formatting {
// Most of the implementation of this file was ported from the native versions built into the CLR
// See: https://github.com/dotnet/coreclr/blob/838807429a0828a839958e3b7d392d65886c8f2e/src/classlibnative/bcltype/number.cpp
// Also see: https://github.com/dotnet/coreclr/blob/02084af832c2900cf6eac2a168c41f261409be97/src/mscorlib/src/System/Number.cs
// Standard numeric format string reference: https://msdn.microsoft.com/en-us/library/dwhawy9k%28v=vs.110%29.aspx
unsafe static partial class Numeric {
public static void FormatSByte (StringBuffer formatter, sbyte value, StringView specifier, CachedCulture culture) {
if (value < 0 && !specifier.IsEmpty) {
// if we're negative and doing a hex format, mask out the bits for the conversion
char c = specifier.Data[0];
if (c == 'X' || c == 'x')
{
FormatUInt32(formatter, (uint)(value & 0xFF), specifier, culture);
return;
}
}
FormatInt32(formatter, value, specifier, culture);
}
public static void FormatInt16 (StringBuffer formatter, short value, StringView specifier, CachedCulture culture) {
if (value < 0 && !specifier.IsEmpty) {
// if we're negative and doing a hex format, mask out the bits for the conversion
char c = specifier.Data[0];
if (c == 'X' || c == 'x')
{
FormatUInt32(formatter, (uint)(value & 0xFFFF), specifier, culture);
return;
}
}
FormatInt32(formatter, value, specifier, culture);
}
public static void FormatInt32 (StringBuffer formatter, int value, StringView specifier, CachedCulture culture) {
int digits;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 0)
goto default;
else
goto case 'D';
case 'D':
Int32ToDecStr(formatter, value, digits, culture.NegativeSign);
break;
case 'X':
// fmt-('X'-'A'+1) gives us the base hex character in either
// uppercase or lowercase, depending on the casing of fmt
Int32ToHexStr(formatter, (uint)value, fmt - ('X' - 'A' + 10), digits);
break;
default:
var number = new Number();
var buffer = stackalloc char[MaxNumberDigits + 1];
number.Digits = buffer;
Int32ToNumber(value, ref number);
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
break;
}
}
public static void FormatUInt32 (StringBuffer formatter, uint value, StringView specifier, CachedCulture culture) {
int digits;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 0)
goto default;
else
goto case 'D';
case 'D':
UInt32ToDecStr(formatter, value, digits);
break;
case 'X':
// fmt-('X'-'A'+1) gives us the base hex character in either
// uppercase or lowercase, depending on the casing of fmt
Int32ToHexStr(formatter, value, fmt - ('X' - 'A' + 10), digits);
break;
default:
var number = new Number();
var buffer = stackalloc char[MaxNumberDigits + 1];
number.Digits = buffer;
UInt32ToNumber(value, ref number);
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
break;
}
}
public static void FormatInt64 (StringBuffer formatter, long value, StringView specifier, CachedCulture culture) {
int digits;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 0)
goto default;
else
goto case 'D';
case 'D':
Int64ToDecStr(formatter, value, digits, culture.NegativeSign);
break;
case 'X':
// fmt-('X'-'A'+1) gives us the base hex character in either
// uppercase or lowercase, depending on the casing of fmt
Int64ToHexStr(formatter, (ulong)value, fmt - ('X' - 'A' + 10), digits);
break;
default:
var number = new Number();
var buffer = stackalloc char[MaxNumberDigits + 1];
number.Digits = buffer;
Int64ToNumber(value, ref number);
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
break;
}
}
public static void FormatUInt64 (StringBuffer formatter, ulong value, StringView specifier, CachedCulture culture) {
int digits;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 0)
goto default;
else
goto case 'D';
case 'D':
UInt64ToDecStr(formatter, value, digits);
break;
case 'X':
// fmt-('X'-'A'+1) gives us the base hex character in either
// uppercase or lowercase, depending on the casing of fmt
Int64ToHexStr(formatter, value, fmt - ('X' - 'A' + 10), digits);
break;
default:
var number = new Number();
var buffer = stackalloc char[MaxNumberDigits + 1];
number.Digits = buffer;
UInt64ToNumber(value, ref number);
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
break;
}
}
public static void FormatSingle (StringBuffer formatter, float value, StringView specifier, CachedCulture culture) {
int digits;
int precision = FloatPrecision;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 7)
precision = 9;
break;
case 'E':
if (digits > 6)
precision = 9;
break;
}
var number = new Number();
var buffer = stackalloc char[MaxFloatingDigits + 1];
number.Digits = buffer;
DoubleToNumber(value, precision, ref number);
if (number.Scale == ScaleNaN) {
formatter.Append(culture.NaN);
return;
}
if (number.Scale == ScaleInf) {
if (number.Sign > 0)
formatter.Append(culture.NegativeInfinity);
else
formatter.Append(culture.PositiveInfinity);
return;
}
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void FormatDouble (StringBuffer formatter, double value, StringView specifier, CachedCulture culture) {
int digits;
int precision = DoublePrecision;
var fmt = ParseFormatSpecifier(specifier, out digits);
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (fmt & 0xFFDF) {
case 'G':
if (digits > 15)
precision = 17;
break;
case 'E':
if (digits > 14)
precision = 17;
break;
}
var number = new Number();
var buffer = stackalloc char[MaxFloatingDigits + 1];
number.Digits = buffer;
DoubleToNumber(value, precision, ref number);
if (number.Scale == ScaleNaN) {
formatter.Append(culture.NaN);
return;
}
if (number.Scale == ScaleInf) {
if (number.Sign > 0)
formatter.Append(culture.NegativeInfinity);
else
formatter.Append(culture.PositiveInfinity);
return;
}
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void FormatDecimal (StringBuffer formatter, uint* value, StringView specifier, CachedCulture culture) {
int digits;
var fmt = ParseFormatSpecifier(specifier, out digits);
var number = new Number();
var buffer = stackalloc char[MaxNumberDigits + 1];
number.Digits = buffer;
DecimalToNumber(value, ref number);
if (fmt != 0)
NumberToString(formatter, ref number, fmt, digits, culture, isDecimal: true);
else
NumberToCustomFormatString(formatter, ref number, specifier, culture);
}
static void NumberToString (StringBuffer formatter, ref Number number, char format, int maxDigits, CachedCulture culture, bool isDecimal = false) {
// ANDing with 0xFFDF has the effect of uppercasing the character
switch (format & 0xFFDF) {
case 'C':
{
var cultureData = culture.CurrencyData;
var bufferSize = cultureData.GetBufferSize(ref maxDigits, number.Scale);
RoundNumber(ref number, number.Scale + maxDigits);
var buffer = stackalloc char[bufferSize];
var ptr = FormatCurrency(
buffer,
ref number,
maxDigits,
cultureData,
number.Sign > 0 ? culture.CurrencyNegativePattern : culture.CurrencyPositivePattern,
culture.CurrencySymbol
);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
case 'F':
{
var cultureData = culture.FixedData;
var bufferSize = cultureData.GetBufferSize(ref maxDigits, number.Scale);
RoundNumber(ref number, number.Scale + maxDigits);
var buffer = stackalloc char[bufferSize];
var ptr = buffer;
if (number.Sign > 0)
AppendString(&ptr, cultureData.NegativeSign);
ptr = FormatFixed(ptr, ref number, maxDigits, cultureData);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
case 'N':
{
var cultureData = culture.NumberData;
var bufferSize = cultureData.GetBufferSize(ref maxDigits, number.Scale);
RoundNumber(ref number, number.Scale + maxDigits);
var buffer = stackalloc char[bufferSize];
var ptr = FormatNumber(
buffer,
ref number,
maxDigits,
number.Sign > 0 ? culture.NumberNegativePattern : culture.NumberPositivePattern,
cultureData
);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
case 'E':
{
var cultureData = culture.ScientificData;
var bufferSize = cultureData.GetBufferSize(ref maxDigits, number.Scale);
maxDigits++;
RoundNumber(ref number, maxDigits);
var buffer = stackalloc char[bufferSize];
var ptr = buffer;
if (number.Sign > 0)
AppendString(&ptr, cultureData.NegativeSign);
ptr = FormatScientific(
ptr,
ref number,
maxDigits,
format, // TODO: fix casing
cultureData.DecimalSeparator,
culture.PositiveSign,
culture.NegativeSign
);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
case 'P':
{
number.Scale += 2;
var cultureData = culture.PercentData;
var bufferSize = cultureData.GetBufferSize(ref maxDigits, number.Scale);
RoundNumber(ref number, number.Scale + maxDigits);
var buffer = stackalloc char[bufferSize];
var ptr = FormatPercent(
buffer,
ref number,
maxDigits,
cultureData,
number.Sign > 0 ? culture.PercentNegativePattern : culture.PercentPositivePattern,
culture.PercentSymbol
);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
case 'G':
{
var enableRounding = true;
if (maxDigits < 1) {
if (isDecimal && maxDigits == -1) {
// if we're formatting a decimal, default to 29 digits precision
// only for G formatting without a precision specifier
maxDigits = DecimalPrecision;
enableRounding = false;
}
else
maxDigits = number.Precision;
}
var bufferSize = maxDigits + culture.DecimalBufferSize;
var buffer = stackalloc char[bufferSize];
var ptr = buffer;
// round for G formatting only if a precision is given
// we need to handle the minus zero case also
if (enableRounding)
RoundNumber(ref number, maxDigits);
else if (isDecimal && number.Digits[0] == 0)
number.Sign = 0;
if (number.Sign > 0)
AppendString(&ptr, culture.NegativeSign);
ptr = FormatGeneral(
ptr,
ref number,
maxDigits,
(char)(format - ('G' - 'E')),
culture.NumberData.DecimalSeparator,
culture.PositiveSign,
culture.NegativeSign,
!enableRounding
);
formatter.Append(buffer, (int)(ptr - buffer));
break;
}
default:
throw new FormatException(string.Format(SR.UnknownFormatSpecifier, format));
}
}
static char* FormatCurrency (char* buffer, ref Number number, int maxDigits, NumberFormatData data, string currencyFormat, string currencySymbol) {
for (int i = 0; i < currencyFormat.Length; i++) {
char c = currencyFormat[i];
switch (c) {
case '#': buffer = FormatFixed(buffer, ref number, maxDigits, data); break;
case '-': AppendString(&buffer, data.NegativeSign); break;
case '$': AppendString(&buffer, currencySymbol); break;
default: *buffer++ = c; break;
}
}
return buffer;
}
static char* FormatNumber (char* buffer, ref Number number, int maxDigits, string format, NumberFormatData data) {
for (int i = 0; i < format.Length; i++) {
char c = format[i];
switch (c) {
case '#': buffer = FormatFixed(buffer, ref number, maxDigits, data); break;
case '-': AppendString(&buffer, data.NegativeSign); break;
default: *buffer++ = c; break;
}
}
return buffer;
}
static char* FormatPercent (char* buffer, ref Number number, int maxDigits, NumberFormatData data, string format, string percentSymbol) {
for (int i = 0; i < format.Length; i++) {
char c = format[i];
switch (c) {
case '#': buffer = FormatFixed(buffer, ref number, maxDigits, data); break;
case '-': AppendString(&buffer, data.NegativeSign); break;
case '%': AppendString(&buffer, percentSymbol); break;
default: *buffer++ = c; break;
}
}
return buffer;
}
static char* FormatGeneral (
char* buffer, ref Number number, int maxDigits, char expChar,
string decimalSeparator, string positiveSign, string negativeSign,
bool suppressScientific) {
var digitPos = number.Scale;
var scientific = false;
if (!suppressScientific) {
if (digitPos > maxDigits || digitPos < -3) {
digitPos = 1;
scientific = true;
}
}
var digits = number.Digits;
if (digitPos <= 0)
*buffer++ = '0';
else {
do {
*buffer++ = *digits != 0 ? *digits++ : '0';
} while (--digitPos > 0);
}
if (*digits != 0 || digitPos < 0) {
AppendString(&buffer, decimalSeparator);
while (digitPos < 0) {
*buffer++ = '0';
digitPos++;
}
while (*digits != 0)
*buffer++ = *digits++;
}
if (scientific)
buffer = FormatExponent(buffer, number.Scale - 1, expChar, positiveSign, negativeSign, 2);
return buffer;
}
static char* FormatScientific (
char* buffer, ref Number number, int maxDigits, char expChar,
string decimalSeparator, string positiveSign, string negativeSign) {
var digits = number.Digits;
*buffer++ = *digits != 0 ? *digits++ : '0';
if (maxDigits != 1)
AppendString(&buffer, decimalSeparator);
while (--maxDigits > 0)
*buffer++ = *digits != 0 ? *digits++ : '0';
int e = number.Digits[0] == 0 ? 0 : number.Scale - 1;
return FormatExponent(buffer, e, expChar, positiveSign, negativeSign, 3);
}
static char* FormatExponent (char* buffer, int value, char expChar, string positiveSign, string negativeSign, int minDigits) {
*buffer++ = expChar;
if (value < 0) {
AppendString(&buffer, negativeSign);
value = -value;
}
else if (positiveSign != null)
AppendString(&buffer, positiveSign);
var digits = stackalloc char[11];
var ptr = Int32ToDecChars(digits + 10, (uint)value, minDigits);
var len = (int)(digits + 10 - ptr);
while (--len >= 0)
*buffer++ = *ptr++;
return buffer;
}
static char* FormatFixed (char* buffer, ref Number number, int maxDigits, NumberFormatData data) {
var groups = data.GroupSizes;
var digits = number.Digits;
var digitPos = number.Scale;
if (digitPos <= 0)
*buffer++ = '0';
else if (groups != null) {
var groupIndex = 0;
var groupSizeCount = groups[0];
var groupSizeLen = groups.Length;
var newBufferSize = digitPos;
var groupSeparatorLen = data.GroupSeparator.Length;
var groupSize = 0;
// figure out the size of the result
if (groupSizeLen != 0) {
while (digitPos > groupSizeCount) {
groupSize = groups[groupIndex];
if (groupSize == 0)
break;
newBufferSize += groupSeparatorLen;
if (groupIndex < groupSizeLen - 1)
groupIndex++;
groupSizeCount += groups[groupIndex];
if (groupSizeCount < 0 || newBufferSize < 0)
throw new ArgumentOutOfRangeException(SR.InvalidGroupSizes);
}
if (groupSizeCount == 0)
groupSize = 0;
else
groupSize = groups[0];
}
groupIndex = 0;
var digitCount = 0;
var digitLength = StrLen(digits);
var digitStart = digitPos < digitLength ? digitPos : digitLength;
var ptr = buffer + newBufferSize - 1;
for (int i = digitPos - 1; i >= 0; i--) {
*(ptr--) = i < digitStart ? digits[i] : '0';
// check if we need to add a group separator
if (groupSize > 0) {
digitCount++;
if (digitCount == groupSize && i != 0) {
for (int j = groupSeparatorLen - 1; j >= 0; j--)
*(ptr--) = data.GroupSeparator[j];
if (groupIndex < groupSizeLen - 1) {
groupIndex++;
groupSize = groups[groupIndex];
}
digitCount = 0;
}
}
}
buffer += newBufferSize;
digits += digitStart;
}
else {
do {
*buffer++ = *digits != 0 ? *digits++ : '0';
}
while (--digitPos > 0);
}
if (maxDigits > 0) {
AppendString(&buffer, data.DecimalSeparator);
while (digitPos < 0 && maxDigits > 0) {
*buffer++ = '0';
digitPos++;
maxDigits--;
}
while (maxDigits > 0) {
*buffer++ = *digits != 0 ? *digits++ : '0';
maxDigits--;
}
}
return buffer;
}
static void Int32ToDecStr (StringBuffer formatter, int value, int digits, string negativeSign) {
if (digits < 1)
digits = 1;
var maxDigits = digits > 15 ? digits : 15;
var bufferLength = maxDigits > 100 ? maxDigits : 100;
var negativeLength = 0;
if (value < 0) {
negativeLength = negativeSign.Length;
if (negativeLength > bufferLength - maxDigits)
bufferLength = negativeLength + maxDigits;
}
var buffer = stackalloc char[bufferLength];
var p = Int32ToDecChars(buffer + bufferLength, value >= 0 ? (uint)value : (uint)-value, digits);
if (value < 0) {
// add the negative sign
for (int i = negativeLength - 1; i >= 0; i--)
*(--p) = negativeSign[i];
}
formatter.Append(p, (int)(buffer + bufferLength - p));
}
static void UInt32ToDecStr (StringBuffer formatter, uint value, int digits) {
var buffer = stackalloc char[100];
if (digits < 1)
digits = 1;
var p = Int32ToDecChars(buffer + 100, value, digits);
formatter.Append(p, (int)(buffer + 100 - p));
}
static void Int32ToHexStr (StringBuffer formatter, uint value, int hexBase, int digits) {
var buffer = stackalloc char[100];
if (digits < 1)
digits = 1;
var p = Int32ToHexChars(buffer + 100, value, hexBase, digits);
formatter.Append(p, (int)(buffer + 100 - p));
}
static void Int64ToDecStr (StringBuffer formatter, long value, int digits, string negativeSign) {
if (digits < 1)
digits = 1;
var sign = (int)High32((ulong)value);
var maxDigits = digits > 20 ? digits : 20;
var bufferLength = maxDigits > 100 ? maxDigits : 100;
if (sign < 0) {
value = -value;
var negativeLength = negativeSign.Length;
if (negativeLength > bufferLength - maxDigits)
bufferLength = negativeLength + maxDigits;
}
var buffer = stackalloc char[bufferLength];
var p = buffer + bufferLength;
var uv = (ulong)value;
while (High32(uv) != 0) {
p = Int32ToDecChars(p, Int64DivMod(ref uv), 9);
digits -= 9;
}
p = Int32ToDecChars(p, Low32(uv), digits);
if (sign < 0) {
// add the negative sign
for (int i = negativeSign.Length - 1; i >= 0; i--)
*(--p) = negativeSign[i];
}
formatter.Append(p, (int)(buffer + bufferLength - p));
}
static void UInt64ToDecStr (StringBuffer formatter, ulong value, int digits) {
if (digits < 1)
digits = 1;
var buffer = stackalloc char[100];
var p = buffer + 100;
while (High32(value) != 0) {
p = Int32ToDecChars(p, Int64DivMod(ref value), 9);
digits -= 9;
}
p = Int32ToDecChars(p, Low32(value), digits);
formatter.Append(p, (int)(buffer + 100 - p));
}
static void Int64ToHexStr (StringBuffer formatter, ulong value, int hexBase, int digits) {
var buffer = stackalloc char[100];
char* ptr;
if (High32(value) != 0) {
Int32ToHexChars(buffer + 100, Low32(value), hexBase, 8);
ptr = Int32ToHexChars(buffer + 100 - 8, High32(value), hexBase, digits - 8);
}
else {
if (digits < 1)
digits = 1;
ptr = Int32ToHexChars(buffer + 100, Low32(value), hexBase, digits);
}
formatter.Append(ptr, (int)(buffer + 100 - ptr));
}
internal static char* Int32ToDecChars (char* p, uint value, int digits) {
while (value != 0) {
*--p = (char)(value % 10 + '0');
value /= 10;
digits--;
}
while (--digits >= 0)
*--p = '0';
return p;
}
static char* Int32ToHexChars (char* p, uint value, int hexBase, int digits) {
while (--digits >= 0 || value != 0) {
var digit = value & 0xF;
*--p = (char)(digit + (digit < 10 ? '0' : hexBase));
value >>= 4;
}
return p;
}
internal static char ParseFormatSpecifier (StringView specifier, out int digits) {
if (specifier.IsEmpty) {
digits = -1;
return 'G';
}
char* curr = specifier.Data;
char first = *curr++;
if ((first >= 'A' && first <= 'Z') || (first >= 'a' && first <= 'z')) {
if (specifier.Length == 1) {
digits = -1;
return first;
}
var n = 0;
var end = specifier.Data + specifier.Length;
while (curr != end) {
var c = *curr++;
if (c >= '0' && c <= '9') {
n = n * 10 + c - '0';
if (n >= 10)
break;
}
else {
digits = -1;
return (char)0;
}
}
if (curr == end) {
digits = n;
return first;
}
}
digits = -1;
return (char)0;
}
static void Int32ToNumber (int value, ref Number number) {
number.Precision = Int32Precision;
if (value >= 0)
number.Sign = 0;
else {
number.Sign = 1;
value = -value;
}
var buffer = stackalloc char[Int32Precision + 1];
var ptr = Int32ToDecChars(buffer + Int32Precision, (uint)value, 0);
var len = (int)(buffer + Int32Precision - ptr);
number.Scale = len;
var dest = number.Digits;
while (--len >= 0)
*dest++ = *ptr++;
*dest = '\0';
}
static void UInt32ToNumber (uint value, ref Number number) {
number.Precision = UInt32Precision;
number.Sign = 0;
var buffer = stackalloc char[UInt32Precision + 1];
var ptr = Int32ToDecChars(buffer + UInt32Precision, value, 0);
var len = (int)(buffer + UInt32Precision - ptr);
number.Scale = len;
var dest = number.Digits;
while (--len >= 0)
*dest++ = *ptr++;
*dest = '\0';
}
static void Int64ToNumber (long value, ref Number number) {
number.Precision = Int64Precision;
if (value >= 0)
number.Sign = 0;
else {
number.Sign = 1;
value = -value;
}
var buffer = stackalloc char[Int64Precision + 1];
var ptr = buffer + Int64Precision;
var uv = (ulong)value;
while (High32(uv) != 0)
ptr = Int32ToDecChars(ptr, Int64DivMod(ref uv), 9);
ptr = Int32ToDecChars(ptr, Low32(uv), 0);
var len = (int)(buffer + Int64Precision - ptr);
number.Scale = len;
var dest = number.Digits;
while (--len >= 0)
*dest++ = *ptr++;
*dest = '\0';
}
static void UInt64ToNumber (ulong value, ref Number number) {
number.Precision = UInt64Precision;
number.Sign = 0;
var buffer = stackalloc char[UInt64Precision + 1];
var ptr = buffer + UInt64Precision;
while (High32(value) != 0)
ptr = Int32ToDecChars(ptr, Int64DivMod(ref value), 9);
ptr = Int32ToDecChars(ptr, Low32(value), 0);
var len = (int)(buffer + UInt64Precision - ptr);
number.Scale = len;
var dest = number.Digits;
while (--len >= 0)
*dest++ = *ptr++;
*dest = '\0';
}
static void DoubleToNumber (double value, int precision, ref Number number) {
number.Precision = precision;
uint sign, exp, mantHi, mantLo;
ExplodeDouble(value, out sign, out exp, out mantHi, out mantLo);
if (exp == 0x7FF) {
// special value handling (infinity and NaNs)
number.Scale = (mantLo != 0 || mantHi != 0) ? ScaleNaN : ScaleInf;
number.Sign = (int)sign;
number.Digits[0] = '\0';
}
else {
// convert the digits of the number to characters
if (value < 0) {
number.Sign = 1;
value = -value;
}
var digits = number.Digits;
var end = digits + MaxFloatingDigits;
var p = end;
var shift = 0;
double intPart;
double reducedInt;
var fracPart = ModF(value, out intPart);
if (intPart != 0) {
// format the integer part
while (intPart != 0) {
reducedInt = ModF(intPart / 10, out intPart);
*--p = (char)((int)((reducedInt + 0.03) * 10) + '0');
shift++;
}
while (p < end)
*digits++ = *p++;
}
else if (fracPart > 0) {
// normalize the fractional part
while ((reducedInt = fracPart * 10) < 1) {
fracPart = reducedInt;
shift--;
}
}
// concat the fractional part, padding the remainder with zeros
p = number.Digits + precision;
while (digits <= p && digits < end) {
fracPart *= 10;
fracPart = ModF(fracPart, out reducedInt);
*digits++ = (char)((int)reducedInt + '0');
}
// round the result if necessary
digits = p;
*p = (char)(*p + 5);
while (*p > '9') {
*p = '0';
if (p > number.Digits)
++*--p;
else {
*p = '1';
shift++;
}
}
number.Scale = shift;
*digits = '\0';
}
}
static void DecimalToNumber (uint* value, ref Number number) {
// bit 31 of the decimal is the sign bit
// bits 16-23 contain the scale
number.Sign = (int)(*value >> 31);
number.Scale = (int)((*value >> 16) & 0xFF);
number.Precision = DecimalPrecision;
// loop for as long as the decimal is larger than 32 bits
var buffer = stackalloc char[DecimalPrecision + 1];
var p = buffer + DecimalPrecision;
var hi = *(value + 1);
var lo = *(value + 2);
var mid = *(value + 3);
while ((mid | hi) != 0) {
// keep dividing down by one billion at a time
ulong n = hi;
hi = (uint)(n / OneBillion);
n = (n % OneBillion) << 32 | mid;
mid = (uint)(n / OneBillion);
n = (n % OneBillion) << 32 | lo;
lo = (uint)(n / OneBillion);
// format this portion of the number
p = Int32ToDecChars(p, (uint)(n % OneBillion), 9);
}
// finish off with the low 32-bits of the decimal, if anything is left over
p = Int32ToDecChars(p, lo, 0);
var len = (int)(buffer + DecimalPrecision - p);
number.Scale = len - number.Scale;
var dest = number.Digits;
while (--len >= 0)
*dest++ = *p++;
*dest = '\0';
}
static void RoundNumber (ref Number number, int pos) {
var digits = number.Digits;
int i = 0;
while (i < pos && digits[i] != 0) i++;
if (i == pos && digits[i] >= '5') {
while (i > 0 && digits[i - 1] == '9') i--;
if (i > 0)
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