/******************************************************************************

* The MIT License (MIT)

*

* Copyright (c) 2014-2017 Baldur Karlsson

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

******************************************************************************/

#include "common/common.h"

// grisu2 double-to-string function, returns number of digits written to digits array

int grisu2(uint64_t mantissa, int exponent, char digits[18], int &kout);

///////////////////////////////////////////////////////////////////////////////

// functions for appending to output (handling running out of buffer space)

void addchar(char *&output, size_t &actualsize, char *end, char c)

{

actualsize++;

if(output == end)

return;

*(output++) = c;

}

void addchars(char *&output, size_t &actualsize, char *end, size_t num, char c)

{

actualsize += num;

for(size_t i = 0; output != end && i < num; i++)

*(output++) = c;

}

void appendstring(char *&output, size_t &actualsize, char *end, const char *str, size_t len)

{

for(size_t i = 0; i < len; i++)

{

if(str[i] == 0)

return;

actualsize++;

if(output != end)

*(output++) = str[i];

}

}

void appendstring(char *&output, size_t &actualsize, char *end, const char *str)

{

for(size_t i = 0; *str; i++)

{

actualsize++;

if(output != end)

*(output++) = *str;

str++;

}

}

///////////////////////////////////////////////////////////////////////////////

// Flags and general formatting parameters

enum FormatterFlags

{

LeftJustify = 0x1,

PrependPos = 0x2,

PrependSpace = 0x4,

AlternateForm = 0x8,

PadZeroes = 0x10,

// non standard

AlwaysDecimal = 0x20,

};

enum LengthModifier

{

None,

HalfHalf,

Half,

Long,

LongLong,

SizeT,

};

struct FormatterParams

{

FormatterParams() : Flags(0), Width(NoWidth), Precision(NoPrecision), Length(None) {}

int Flags;

int Width;

int Precision;

LengthModifier Length;

static const int NoWidth = -1; // can't set negative width, so -1 indicates no width specified

static const int NoPrecision =

-1; // can't set negative precision, so -1 indicates no precision specified

};

///////////////////////////////////////////////////////////////////////////////

// Print a number in a specified base (16, 8, 10 or 2 supported)

void PrintInteger(bool typeUnsigned, uint64_t argu, int base, uint64_t numbits,

FormatterParams formatter, bool uppercaseDigits, char *&output,

size_t &actualsize, char *end)

{

int64_t argi = 0;

union

{

uint64_t *u64;

signed int *i;

signed char *c;

signed short *s;

int64_t *i64;

} typepun;

typepun.u64 = &argu;

// cast the appropriate size to signed version

switch(formatter.Length)

{

default:

case None:

case Long: argi = (int64_t)*typepun.i; break;

case HalfHalf: argi = (int64_t)*typepun.c; break;

case Half: argi = (int64_t)*typepun.s; break;

case LongLong: argi = (int64_t)*typepun.i64; break;

case SizeT: argi = (int64_t)*typepun.i64; break;

}

bool negative = false;

if(base == 10 && !typeUnsigned)

{

negative = argi < 0;

}

int digwidth = 0;

int numPad0s = 0;

int numPadWidth = 0;

{

int intwidth = 0;

int digits = 0;

// work out the number of decimal digits in the integer

if(!negative)

{

uint64_t accum = argu;

while(accum)

{

digits += 1;

accum /= base;

}

}

else

{

int64_t accum = argi;

while(accum)

{

digits += 1;

accum /= base;

}

}

intwidth = digwidth = RDCMAX(1, digits);

// printed int is 2 chars larger for 0x or 0b, and 1 char for 0 (octal)

if(base == 16 || base == 2)

intwidth += formatter.Flags & AlternateForm ? 2 : 0;

if(base == 8)

intwidth += formatter.Flags & AlternateForm ? 1 : 0;

if(formatter.Precision != FormatterParams::NoPrecision && formatter.Precision > intwidth)

numPad0s = formatter.Precision - intwidth;

intwidth += numPad0s;

// for decimal we can have a negative sign (or placeholder)

if(base == 10)

{

if(negative)

intwidth++;

else if(formatter.Flags & (PrependPos | PrependSpace))

intwidth++;

}

if(formatter.Width != FormatterParams::NoWidth && formatter.Width > intwidth)

numPadWidth = formatter.Width - intwidth;

}

// pad with spaces if necessary

if((formatter.Flags & (LeftJustify | PadZeroes)) == 0 && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, ' ');

if(base == 16)

{

if(formatter.Flags & AlternateForm)

{

appendstring(output, actualsize, end, "0x");

}

// pad with 0s as appropriate

if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, '0');

if(numPad0s > 0)

addchars(output, actualsize, end, (size_t)numPad0s, '0');

bool left0s = true;

// mask off each hex digit and print

for(uint64_t i = 0; i < numbits; i += 4)

{

uint64_t shift = numbits - 4 - i;

uint64_t mask = 0xfULL << shift;

char digit = char((argu & mask) >> shift);

if(digit == 0 && left0s && i + 4 < numbits)

continue;

left0s = false;

if(digit < 10)

addchar(output, actualsize, end, '0' + digit);

else if(uppercaseDigits)

addchar(output, actualsize, end, 'A' + digit - 10);

else

addchar(output, actualsize, end, 'a' + digit - 10);

}

}

else if(base == 8)

{

if(formatter.Flags & AlternateForm)

appendstring(output, actualsize, end, "0");

if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, '0');

if(numPad0s > 0)

addchars(output, actualsize, end, (size_t)numPad0s, '0');

// octal digits don't quite fit into typical integer sizes,

// so instead we pretend the number is a little bigger, then

// the shift just fills out the upper bits with 0s.

uint64_t offs = 0;

if(numbits % 3 == 1)

offs = 2;

if(numbits % 3 == 2)

offs = 1;

bool left0s = true;

for(uint64_t i = 0; i < numbits; i += 3)

{

uint64_t shift = numbits - 3 - i + offs;

uint64_t mask = 0x7ULL << shift;

char digit = char((argu & mask) >> shift);

if(digit == 0 && left0s && i + 3 < numbits)

continue;

left0s = false;

addchar(output, actualsize, end, '0' + digit);

}

}

else if(base == 2)

{

if(formatter.Flags & AlternateForm)

{

if(uppercaseDigits)

appendstring(output, actualsize, end, "0B");

else

appendstring(output, actualsize, end, "0b");

}

if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, '0');

if(numPad0s > 0)

addchars(output, actualsize, end, (size_t)numPad0s, '0');

bool left0s = true;

for(uint64_t i = 0; i < numbits; i++)

{

uint64_t shift = numbits - 1 - i;

uint64_t mask = 0x1ULL << shift;

char digit = char((argu & mask) >> shift);

if(digit == 0 && left0s && i + 1 < numbits)

continue;

left0s = false;

addchar(output, actualsize, end, '0' + digit);

}

}

else

{

// buffer large enough for any int (up to 64bit unsigned)

char intbuf[32] = {0};

// handle edge case of INT_MIN so we can negate the number and be sure we

// won't actualsize

if(argu == 0x8000000000000000)

{

addchar(output, actualsize, end, '-');

if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, '0');

if(numPad0s > 0)

addchars(output, actualsize, end, (size_t)numPad0s, '0');

appendstring(output, actualsize, end, "9223372036854775808");

}

else

{

// we know we can negate without loss of precision because we handled 64bit INT_MIN above

if(negative)

{

addchar(output, actualsize, end, '-');

argi = -argi;

}

else if(formatter.Flags & PrependPos)

addchar(output, actualsize, end, '+');

else if(formatter.Flags & PrependSpace)

addchar(output, actualsize, end, ' ');

if((formatter.Flags & (LeftJustify | PadZeroes)) == PadZeroes && numPadWidth > 0)

addchars(output, actualsize, end, (size_t)numPadWidth, '0');

if(numPad0s > 0)

addchars(output, actualsize, end, (size_t)numPad0s, '0');

if(typeUnsigned)

{

uint64_t accum = argu;

for(int i = 0; i < digwidth; i++)

{

int digit = accum % 10;

accum /= 10;

intbuf[digwidth - 1 - i] = char('0' + digit);

}

}

else

{

int64_t accum = argi;

for(int i = 0; i < digwidth; i++)

{

int digit = accum % 10;

accum /= 10;

intbuf[digwidth - 1 - i] = char('0' + digit);

}

}

char *istr = intbuf;

while(*istr == '0')

istr++;

if(*istr == 0 && istr > intbuf)

istr--;

appendstring(output, actualsize, end, istr);

}

}

// if we were left justifying, pad on the right with spaces

if((formatter.Flags & LeftJustify) && numPadWidth > 0)

{

addchars(output, actualsize, end, (size_t)numPadWidth, ' ');

}

}

void PrintFloat0(bool e, bool f, FormatterParams formatter, char prepend, char *&output,

size_t &actualsize, char *end)

{

int numwidth = 0;

if(e)

numwidth = formatter.Precision + 1 + 5; // 0 plus precision plus e+000

else if(f || formatter.Flags & AlternateForm)

numwidth = formatter.Precision + 1; // 0 plus precision

else

numwidth = 1;

// alternate form means . is included even if no digits after .

if(((e || f) && formatter.Precision > 0) || (formatter.Flags & AlternateForm))

numwidth++; // .

if(!e && !f && (formatter.Flags & AlwaysDecimal))

{

numwidth += 2; // .0

}

// sign space

if(prepend)

numwidth++;

int padlen = 0;

if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)

padlen = formatter.Width - numwidth;

if(formatter.Flags & PadZeroes)

{

if(prepend)

addchar(output, actualsize, end, prepend);

addchars(output, actualsize, end, size_t(padlen), '0');

}

else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)

{

addchars(output, actualsize, end, size_t(padlen), ' ');

if(prepend)

addchar(output, actualsize, end, prepend);

}

else

{

if(prepend)

addchar(output, actualsize, end, prepend);

}

// print a .0 for all cases except non-alternate %g

if(e || f || formatter.Flags & AlternateForm)

{

addchar(output, actualsize, end, '0');

if(formatter.Precision > 0 || (formatter.Flags & AlternateForm))

addchar(output, actualsize, end, '.');

addchars(output, actualsize, end, size_t(formatter.Precision), '0');

if(e)

appendstring(output, actualsize, end, "e+000");

}

else

{

addchar(output, actualsize, end, '0');

if(!e && !f && (formatter.Flags & AlwaysDecimal))

{

addchar(output, actualsize, end, '.');

addchar(output, actualsize, end, '0');

}

}

if(padlen > 0 && (formatter.Flags & LeftJustify))

{

addchars(output, actualsize, end, size_t(padlen), ' ');

}

}

void PrintFloat(double argd, FormatterParams &formatter, bool e, bool f, bool g,

bool uppercaseDigits, char *&output, size_t &actualsize, char *end)

{

// extract the pieces out of the double

uint64_t *arg64 = (uint64_t *)&argd;

bool signbit = (*arg64 & 0x8000000000000000) ? true : false;

uint64_t rawexp = (*arg64 & 0x7ff0000000000000) >> 52;

int exponent = int(rawexp) - 1023;

uint64_t mantissa = (*arg64 & 0x000fffffffffffff);

char prepend = '\0';

if(signbit)

prepend = '-';

else if(formatter.Flags & PrependPos)

prepend = '+';

else if(formatter.Flags & PrependSpace)

prepend = ' ';

// special-case handling of printing 0

if(rawexp == 0 && mantissa == 0)

{

PrintFloat0(e, f, formatter, prepend, output, actualsize, end);

}

// handle 'special' values, inf and nan

else if(rawexp == 0x7ff)

{

if(mantissa == 0)

{

if(signbit)

appendstring(output, actualsize, end, uppercaseDigits ? "-INF" : "-inf");

else

appendstring(output, actualsize, end, uppercaseDigits ? "+INF" : "+inf");

}

else

{

appendstring(output, actualsize, end, uppercaseDigits ? "NAN" : "nan");

}

}

else

{

// call out to grisu2 to generate digits + exponent

char digits[18] = {0};

int K = 0;

int ndigits = grisu2(mantissa, exponent, digits, K);

// this is the decimal exponent (ie. 0 if the digits are 1.2345)

int expon = K + ndigits - 1;

// number of digits after the decimal

int decdigits = ndigits - expon - 1;

// for exponential form, this is always 1 less than the total number of digits

if(e)

decdigits = RDCMAX(0, ndigits - 1);

// see if we need to trim some digits (for %g, the precision is the number of

// significant figures which is just ndigits at the moment, will be padded with 0s

// later).

if(decdigits > formatter.Precision || (g && ndigits > formatter.Precision))

{

int removedigs = decdigits - formatter.Precision;

if(g)

removedigs = RDCMAX(0, ndigits - formatter.Precision);

// if we're removing all digits, just check the first to see if it should be

// rounded up or down

if(removedigs == ndigits)

{

ndigits = 1;

if(digits[0] < '5')

{

digits[0] = '0';

}

else

{

// round up to "1" on the next exponent

digits[0] = '1';

expon++;

}

}

else if(removedigs > ndigits)

{

ndigits = 1;

digits[0] = '0';

expon = 0;

}

else

{

// remove the specified number of digits

ndigits -= removedigs;

// round up the last digit (continually rolling up if necessary)

// note this will look 'ahead' into the last removed digits at first

bool carry = true;

for(int i = ndigits - 1; i >= 0; i--)

{

// should we round up?

if(digits[i + 1] >= '5')

{

digits[i + 1] = 0;

// unless current digit is a 9, we can just increment it and stop

if(digits[i] < '9')

{

digits[i]++;

carry = false;

break;

}

// continue (carry to next digit)

}

else

{

// didn't need to round up, everything's fine.

carry = false;

break;

}

// trim off a digit (was a 9)

ndigits--;

continue;

}

// we only get here with carry still true if digits are 9999999

if(carry)

{

// round up to "1" on the next exponent

ndigits = 1;

digits[0] = '1';

expon++;

}

}

}

// recalculate decimal digits with new ndigits

decdigits = ndigits - expon - 1;

if(e)

decdigits = RDCMAX(0, ndigits - 1);

// number of trailing 0s we need to pad after decimal point determined by

// the precision

int padtrailing0s = formatter.Precision - RDCMAX(0, decdigits);

if(g)

{

// for %g if the exponent is too far out of range, we revert to exponential form

if(expon >= formatter.Precision || expon < -4)

{

e = true;

// if not alternate form, all trailing 0 digits are removed and there is no padding.

if((formatter.Flags & AlternateForm) == 0)

{

while(ndigits > 1 && digits[ndigits - 1] == '0')

ndigits--;

padtrailing0s = 0;

}

else

padtrailing0s = formatter.Precision - RDCMAX(0, ndigits);

}

else

{

padtrailing0s = formatter.Precision - RDCMAX(0, ndigits);

}

}

// exponential display

if(e)

{

int numwidth = 0;

// first calculate the width of the produced output, so we can calculate any padding

numwidth = ndigits; // digits

if(ndigits > 1 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)

numwidth++; // '.'

numwidth += padtrailing0s;

numwidth += 2; // 'e+' or 'e-'

if(expon >= 1000 || expon <= -1000)

numwidth += 4;

else

numwidth += 3;

if(prepend)

numwidth++; // +, - or ' '

int padlen = 0;

if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)

padlen = formatter.Width - numwidth;

// pad with 0s or ' 's and insert the sign character

if(formatter.Flags & PadZeroes)

{

if(prepend)

addchar(output, actualsize, end, prepend);

addchars(output, actualsize, end, size_t(padlen), '0');

}

else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)

{

addchars(output, actualsize, end, size_t(padlen), ' ');

if(prepend)

addchar(output, actualsize, end, prepend);

}

else

{

if(prepend)

addchar(output, actualsize, end, prepend);

}

// insert the mantissa as a 1.23456 decimal

addchar(output, actualsize, end, digits[0]);

if(ndigits > 1 || (formatter.Flags & AlternateForm) || padtrailing0s > 0)

addchar(output, actualsize, end, '.');

for(int i = 1; i < ndigits; i++)

addchar(output, actualsize, end, digits[i]);

// add the trailing 0s here

if(padtrailing0s > 0)

addchars(output, actualsize, end, size_t(padtrailing0s), '0');

// print the e-XXX exponential

addchar(output, actualsize, end, uppercaseDigits ? 'E' : 'e');

if(expon >= 0)

addchar(output, actualsize, end, '+');

else

addchar(output, actualsize, end, '-');

int exponaccum = expon >= 0 ? expon : -expon;

if(exponaccum >= 1000)

addchar(output, actualsize, end, '0' + char(exponaccum / 1000));

exponaccum %= 1000;

addchar(output, actualsize, end, '0' + char(exponaccum / 100));

exponaccum %= 100;

addchar(output, actualsize, end, '0' + char(exponaccum / 10));

exponaccum %= 10;

addchar(output, actualsize, end, '0' + char(exponaccum));

if(padlen > 0 && (formatter.Flags & LeftJustify))

{

addchars(output, actualsize, end, size_t(padlen), ' ');

}

}

else if(digits[0] == '0' && ndigits == 1)

{

// if we rounded off to a 0.0, print it with special handling

PrintFloat0(e, f, formatter, prepend, output, actualsize, end);

}

else

{

// we're printing as a normal decimal, e.g. 12345.6789

// if %g and not in alternate form, all 0s after the decimal point are stripped

if(g && (formatter.Flags & AlternateForm) == 0)

while(ndigits > 1 && ndigits - 1 > expon && digits[ndigits - 1] == '0')

ndigits--;

int numwidth = 0;

// first calculate the width of the produced output, so we can calculate any padding

// always all digits are printed (after trailing 0s optionally removed above)

numwidth = ndigits;

if(prepend)

numwidth++; // prefix +, - or ' '

// if the exponent is exactly the number of digits we have, we have one 0 to pad

// before the decimal point, and special handling of whether to display the decimal

// point for %g. (note that exponent 0 is mantissa x 10^0 which is 1.2345

if(expon == ndigits)

{

numwidth++; // 0 before decimal place

// if in alternate form for %g we print a . and any trailing 0s necessary to make

// up the precision (number of significant figures)

if(g && (formatter.Flags & AlternateForm))

{

numwidth++; // .

if(padtrailing0s > 1)

numwidth += (padtrailing0s - 1);

}

else if(!g)

{

// otherwise we only print the . if alternate form is specified or we need to

// print trailing 0s

if(padtrailing0s > 0 || (formatter.Flags & AlternateForm))

numwidth++; // .

if(padtrailing0s > 0)

numwidth += padtrailing0s;

}

}

// exponent greater than ndigits means we have padding before the decimal place

// and no values after the decimal place

else if(expon > ndigits)

{

numwidth += (expon + 1 - ndigits); // 0s between digits and decimal place

if((!g || (formatter.Flags & AlternateForm)))

numwidth++; // .

if(padtrailing0s > 0 && (!g || (formatter.Flags & AlternateForm)))

numwidth += padtrailing0s;

}

else if(expon >= 0)

{

// expon < ndigits is true here

if(expon < ndigits - 1 || !g || (formatter.Flags & AlternateForm))

numwidth++; // .

if(g && (formatter.Flags & AlwaysDecimal))

numwidth += 2; // .0

if(padtrailing0s > 0 && (!g || (formatter.Flags & AlternateForm)))

numwidth += padtrailing0s;

}

else // if(expon < 0)

{

numwidth += 2; // 0.;

numwidth += (-1 - expon); // 0s before digits

if(!g || (formatter.Flags & AlternateForm))

numwidth += padtrailing0s;

}

int padlen = 0;

// calculate padding and print it (0s or ' 's) with the sign character

if(formatter.Width != FormatterParams::NoWidth && formatter.Width > numwidth)

padlen = formatter.Width - numwidth;

if(formatter.Flags & PadZeroes)

{

if(prepend)

addchar(output, actualsize, end, prepend);

addchars(output, actualsize, end, size_t(padlen), '0');

}

else if(padlen > 0 && (formatter.Flags & LeftJustify) == 0)

{

addchars(output, actualsize, end, size_t(padlen), ' ');

if(prepend)

addchar(output, actualsize, end, prepend);

}

else

{

if(prepend)

addchar(output, actualsize, end, prepend);

}

// if the exponent is greater than 0 we have to handle padding,

// placing it correctly, whether to show the decimal place or not, etc

if(expon >= 0)

{

// print the digits, adding the . at the right column, as long as it's not

// after the last column AND we are in %g that's not alternate form (ie.

// trailing 0s and . are stripped)

for(int i = 0; i < ndigits; i++)

{

addchar(output, actualsize, end, digits[i]);

if(i == expon)

{

if(i < ndigits - 1 || !g || (formatter.Flags & AlternateForm))

addchar(output, actualsize, end, '.');

}

}

// handle printing trailing 0s here as well as a trailing. if it

// wasn't printed above, and is needed for the print form.

if(expon == ndigits)

{

addchar(output, actualsize, end, '0');

if(g && (formatter.Flags & AlternateForm))

{

addchar(output, actualsize, end, '.');

if(padtrailing0s > 1)

addchars(output, actualsize, end, size_t(padtrailing0s - 1), '0');

}

else if(!g)

{

if(padtrailing0s > 0 || (formatter.Flags & AlternateForm))

addchar(output, actualsize, end, '.');

if(padtrailing0s > 0)

addchars(output, actualsize, end, size_t(padtrailing0s), '0');

}

else if(g && (formatter.Flags & AlwaysDecimal))

{

addchar(output, actualsize, end, '.');

addchar(output, actualsize, end, '0');

}

}

else if(expon > ndigits)

{

addchars(output, actualsize, end, size_t(expon + 1 - ndigits), '0');

if((!g || (formatter.Flags & AlternateForm)))

addchar(output, actualsize, end, '.');

if(padtrailing0s > 0 && (!g || (formatter.Flags & AlternateForm)))

addchars(output, actualsize, end, size_t(padtrailing0s), '0');

if(g && (formatter.Flags & AlwaysDecimal))

{

addchar(output, actualsize, end, '.');

addchar(output, actualsize, end, '0');

}

}

else

{

if(padtrailing0s > 0 && (!g || (formatter.Flags & AlternateForm)))

addchars(output, actualsize, end, size_t(padtrailing0s), '0');

if(ndigits - 1 <= expon && g && (formatter.Flags & AlwaysDecimal))

{

addchar(output, actualsize, end, '.');

addchar(output, actualsize, end, '0');

}

}

}

// if exponent is less than 0 it's much easier - just print the number as

// digits at the right column, then any trailing 0s necessary

else

{

appendstring(output, actualsize, end, "0.");

addchars(output, actualsize, end, size_t(-1 - expon), '0');

appendstring(output, actualsize, end, digits, size_t(ndigits));

if(padtrailing0s > 0 && (!g || (formatter.Flags & AlternateForm)))

addchars(output, actualsize, end, size_t(padtrailing0s), '0');

}

if(padlen > 0 && (formatter.Flags & LeftJustify))

{

addchars(output, actualsize, end, size_t(padlen), ' ');

}

}

}

}

void formatargument(char type, void *rawarg, FormatterParams formatter, char *&output,

size_t &actualsize, char *end)

{

// print a single character (ascii or wide)

if(type == 'c')

{

int arg = *(int *)rawarg;

// left padding - character is always by definition one space wide

if(formatter.Width != FormatterParams::NoWidth && !(formatter.Flags & LeftJustify))

addchars(output, actualsize, end, (size_t)formatter.Width - 1, ' ');

if(formatter.Length == Long)

{

wchar_t chr = (wchar_t)arg;

// convert single wide character to UTF-8 sequence, at most

// 4 characters

char mbchr[4];

int seqlen = StringFormat::Wide2UTF8(chr, mbchr);

appendstring(output, actualsize, end, mbchr, seqlen);

}

else

{

char chr = (char)arg;

addchar(output, actualsize, end, chr);

}

// right padding

if(formatter.Width != FormatterParams::NoWidth && (formatter.Flags & LeftJustify))

addchars(output, actualsize, end, (size_t)formatter.Width - 1, ' ');

}

else if(type == 's')

{

void *arg = *(void **)rawarg;

if(formatter.Length == Long)

{

const wchar_t *ws = (const wchar_t *)arg;

if(arg == NULL)

ws = L"(null)";

size_t width = (size_t)formatter.Width;

size_t precision = (size_t)formatter.Precision;

size_t len = wcslen(ws);

// clip length to precision

if(formatter.Precision != FormatterParams::NoPrecision)

len = RDCMIN(len, precision);

// convert the substring to UTF-8

string str = StringFormat::Wide2UTF8(std::wstring(ws, ws + len));

// add left padding, if necessary

if(formatter.Width != FormatterParams::NoWidth && len < width &&

!(formatter.Flags & LeftJustify))

addchars(output, actualsize, end, width - len, ' ');

appendstring(output, actualsize, end, str.c_str());

// add right padding

if(formatter.Width != FormatterParams::NoWidth && len < width && (formatter.Flags & LeftJustify))

addchars(output, actualsize, end, width - len, ' ');

}

else

{

const char *s = (const char *)arg;

if(arg == NULL)

s = "(null)";

size_t len = 0;

size_t clipoffs = 0;

size_t width = (size_t)formatter.Width;

size_t precision = (size_t)formatter.Precision;

// iterate through UTF-8 string to find its length (for padding in case

// format width is longer than the string) or where to clip off a substring

// (if the precision is shorter than the string)

const char *si = s;

while(*si && (formatter.Precision == FormatterParams::NoPrecision || precision > 0))

{

if((*si & 0x80) == 0) // ascii character

{

si++;

}

else if((*si & 0xC0) == 0xC0) // first byte of a sequence

{

si++;

// skip past continuation bytes (if we hit a NULL terminator this loop will break out)

while((*si & 0xC0) == 0x80)

si++;

}

else

{

// invalid UTF-8 byte to encounter, bail out here.

clipoffs = 0;

len = 0;

s = "";

break;

}